Keys - Machine– Page7 – Miniature Bearings Australia - MBA Minibearings- Domestic & Export

Width (W)	Height (h)	Length (L)	Indicative Image
Machine Keys - 4x4x15 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1500AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Width (W)	Height (h)	Length (L)	Indicative Image
Machine Keys - 4x4x15 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1500AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x15 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1500BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x15 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1500BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 100
Part Number: K-0400-0400-1500A-3 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $5.68 AUD Regular price Sale price $5.68 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 100
Part Number: K-0400-0400-1500A-3 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $5.68 AUD Regular price Sale price $5.68 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-1500A-3 (Each) --- Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key K-0400-0400-1500A-3 (Each) --- Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key Regular price $5.68 AUD Regular price Sale price $5.68 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now
Machine Keys - 4x4x15 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 883
Part Number: K-0400-0400-1500A-C (PK-375) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $388.77 AUD Regular price Sale price $388.77 AUD Unit price per Priced, Stocked and Sold Per 375 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x15 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 15.00 mm _{+/- 0.25} (Equiv. 0.591 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 883
Part Number: K-0400-0400-1500A-C (PK-375) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $388.77 AUD Regular price Sale price $388.77 AUD Unit price per Priced, Stocked and Sold Per 375 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-1500A-C (PK-375) --- Machine Keys - 4x4x15 mm - Carbon Steel Key K-0400-0400-1500A-C (PK-375) --- Machine Keys - 4x4x15 mm - Carbon Steel Key Regular price $388.77 AUD Regular price Sale price $388.77 AUD Unit price per Priced, Stocked and Sold Per 375 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now
Machine Keys - 4x4x16 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 5140
Part Number: K-0400-0400-1600A-C (PK-10) 46 units (460 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $6.05 AUD Regular price Sale price $6.05 AUD Unit price per Priced, Stocked and Sold Per 10 Units Excludes GST and overseas Taxes & Duties Quantity Required Larger quantities than the 46 available can be backordered.
Machine Keys - 4x4x16 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 5140
Part Number: K-0400-0400-1600A-C (PK-10) 46 units (460 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $6.05 AUD Regular price Sale price $6.05 AUD Unit price per Priced, Stocked and Sold Per 10 Units Excludes GST and overseas Taxes & Duties Quantity Required 46 units (460 pcs) Available Now. Backorder if more than 46.
K-0400-0400-1600A-C (PK-10) --- Machine Keys - 4x4x16 mm - Carbon Steel Key K-0400-0400-1600A-C (PK-10) --- Machine Keys - 4x4x16 mm - Carbon Steel Key Regular price $6.05 AUD Regular price Sale price $6.05 AUD Unit price per Priced, Stocked and Sold Per 10 Units Excludes GST and overseas Taxes & Duties 46 Available Now
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1543
Part Number: K-0400-0400-1600B-C (PK-100) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $24.95 AUD Regular price ~~$29.95 AUD~~ Sale price $24.95 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1543
Part Number: K-0400-0400-1600B-C (PK-100) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $24.95 AUD Regular price ~~$29.95 AUD~~ Sale price $24.95 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-1600B-C (PK-100) --- Machine Keys - 4x4x16 mm - Carbon Steel C45 Key Sale K-0400-0400-1600B-C (PK-100) --- Machine Keys - 4x4x16 mm - Carbon Steel C45 Key Regular price $24.95 AUD Regular price ~~$29.95 AUD~~ Sale price $24.95 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x16 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 16.00 mm _{+/- 0.25} (Equiv. 0.63 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x16 mm - Carbon Steel Key
Width (W) 4.00 mm (Equiv. 0.157 in.)	Height (h) 4.00 mm (Equiv. 0.157 in.)	Length (L) 16.00 mm (Equiv. 0.63 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600AB-C (Each) Out of Stock \| Backorder Now \| Orders can be expected around Sun, Feb 01, 2026 Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x16 mm - Carbon Steel Key
Width (W) 4.00 mm (Equiv. 0.157 in.)	Height (h) 4.00 mm (Equiv. 0.157 in.)	Length (L) 16.00 mm (Equiv. 0.63 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-1600AB-C (Each) Out of Stock \| Backorder Now \| Orders can be expected around Sun, Feb 01, 2026 Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-1600AB-C (Each) --- Machine Keys - 4x4x16 mm - Carbon Steel Key Sale K-0400-0400-1600AB-C (Each) --- Machine Keys - 4x4x16 mm - Carbon Steel Key Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x18 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 18.00 mm _{+/- 0.25} (Equiv. 0.709 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1938
Part Number: K-0400-0400-1800A-C (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $29.77 AUD Regular price ~~$35.73 AUD~~ Sale price $29.77 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x18 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 18.00 mm _{+/- 0.25} (Equiv. 0.709 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1938
Part Number: K-0400-0400-1800A-C (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $29.77 AUD Regular price ~~$35.73 AUD~~ Sale price $29.77 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-1800A-C (PK-50) --- Machine Keys - 4x4x18 mm - Carbon Steel Key Sale K-0400-0400-1800A-C (PK-50) --- Machine Keys - 4x4x18 mm - Carbon Steel Key Regular price $29.77 AUD Regular price ~~$35.73 AUD~~ Sale price $29.77 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 18.00 mm _{+/- 0.25} (Equiv. 0.709 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel Deleted Item. Available while stocks last.
Part Number: K-0400-0400-1800A-6 (Each) 1 Available Now \| Item Discontinued - Up to 1 may be ordered online. No backorders. Please contact us if you need a larger quantity Regular price $2.00 AUD Regular price ~~$3.80 AUD~~ Sale price $2.00 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required 1 Available Now. These are priced to quit. Please contact us for a quote if you require more.
Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 18.00 mm _{+/- 0.25} (Equiv. 0.709 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel Deleted Item. Available while stocks last.
Part Number: K-0400-0400-1800A-6 (Each) 1 Available Now \| Item Discontinued - Up to 1 may be ordered online. No backorders. Please contact us if you need a larger quantity Regular price $2.00 AUD Regular price ~~$3.80 AUD~~ Sale price $2.00 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required 1 Available Now. These are priced to quit. Please contact us for a quote if you require more.
K-0400-0400-1800A-6 (Each) --- Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key Sale K-0400-0400-1800A-6 (Each) --- Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key Regular price $2.00 AUD Regular price ~~$3.80 AUD~~ Sale price $2.00 AUD Unit price per Each Excludes GST and overseas Taxes & Duties 1 Available Now Sale
Machine Keys - 4x4x20 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 11605
Part Number: K-0400-0400-2000A-C (PK-5) 86 units (430 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $3.95 AUD Regular price Sale price $3.95 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties Quantity Required Larger quantities than the 86 available can be backordered.
Machine Keys - 4x4x20 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 11605
Part Number: K-0400-0400-2000A-C (PK-5) 86 units (430 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $3.95 AUD Regular price Sale price $3.95 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties Quantity Required 86 units (430 pcs) Available Now. Backorder if more than 86.
K-0400-0400-2000A-C (PK-5) --- Machine Keys - 4x4x20 mm - Carbon Steel Key K-0400-0400-2000A-C (PK-5) --- Machine Keys - 4x4x20 mm - Carbon Steel Key Regular price $3.95 AUD Regular price Sale price $3.95 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties 86 Available Now
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel
Part Number: K-0400-0400-2000A-6 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Tue, Feb 03, 2026 Regular price $27.77 AUD Regular price ~~$33.33 AUD~~ Sale price $27.77 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel
Part Number: K-0400-0400-2000A-6 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Tue, Feb 03, 2026 Regular price $27.77 AUD Regular price ~~$33.33 AUD~~ Sale price $27.77 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2000A-6 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key Sale K-0400-0400-2000A-6 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key Regular price $27.77 AUD Regular price ~~$33.33 AUD~~ Sale price $27.77 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x20 mm - Carbon Steel Key
Width (W) 4.00 mm (Equiv. 0.157 in.)	Height (h) 4.00 mm (Equiv. 0.157 in.)	Length (L) 20.00 mm (Equiv. 0.787 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000AB-C (Each) Out of Stock \| Backorder Now \| Orders can be expected around Sun, Feb 01, 2026 Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x20 mm - Carbon Steel Key
Width (W) 4.00 mm (Equiv. 0.157 in.)	Height (h) 4.00 mm (Equiv. 0.157 in.)	Length (L) 20.00 mm (Equiv. 0.787 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2000AB-C (Each) Out of Stock \| Backorder Now \| Orders can be expected around Sun, Feb 01, 2026 Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2000AB-C (Each) --- Machine Keys - 4x4x20 mm - Carbon Steel Key Sale K-0400-0400-2000AB-C (Each) --- Machine Keys - 4x4x20 mm - Carbon Steel Key Regular price $1.41 AUD Regular price ~~$1.69 AUD~~ Sale price $1.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 201
Part Number: K-0400-0400-2000A-3 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $4.41 AUD Regular price Sale price $4.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 201
Part Number: K-0400-0400-2000A-3 (Each) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $4.41 AUD Regular price Sale price $4.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2000A-3 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key K-0400-0400-2000A-3 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key Regular price $4.41 AUD Regular price Sale price $4.41 AUD Unit price per Each Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 824
Part Number: K-0400-0400-2000B-C (PK-100) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $33.59 AUD Regular price ~~$40.31 AUD~~ Sale price $33.59 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x20 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 20.00 mm _{+/- 0.25} (Equiv. 0.787 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 824
Part Number: K-0400-0400-2000B-C (PK-100) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $33.59 AUD Regular price ~~$40.31 AUD~~ Sale price $33.59 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2000B-C (PK-100) --- Machine Keys - 4x4x20 mm - Carbon Steel C45 Key Sale K-0400-0400-2000B-C (PK-100) --- Machine Keys - 4x4x20 mm - Carbon Steel C45 Key Regular price $33.59 AUD Regular price ~~$40.31 AUD~~ Sale price $33.59 AUD Unit price per Priced, Stocked and Sold Per 100 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2500BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2500BO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x25 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel
Part Number: K-0400-0400-2500A-6 (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x25 mm - Stainless Steel 316 Similar to A4, 18-10 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Stainless Steel 316 (Similar to A4, 18-10) Category: Keys - Machine - Stainless Steel
Part Number: K-0400-0400-2500A-6 (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1236
Part Number: K-0400-0400-2500B-C (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $11.95 AUD Regular price ~~$14.35 AUD~~ Sale price $11.95 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1236
Part Number: K-0400-0400-2500B-C (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $11.95 AUD Regular price ~~$14.35 AUD~~ Sale price $11.95 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2500B-C (PK-50) --- Machine Keys - 4x4x25 mm - Carbon Steel C45 Key Sale K-0400-0400-2500B-C (PK-50) --- Machine Keys - 4x4x25 mm - Carbon Steel C45 Key Regular price $11.95 AUD Regular price ~~$14.35 AUD~~ Sale price $11.95 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 337
Part Number: K-0400-0400-2500B-3 (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $59.50 AUD Regular price ~~$71.40 AUD~~ Sale price $59.50 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key
Width (W) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.051} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Stainless Steel 303 (Similar to A2, 304, 18-8) Category: Keys - Machine - Stainless Steel Additional stock available from USA subject to Prior Sale = 337
Part Number: K-0400-0400-2500B-3 (PK-50) Out of Stock \| Backorder Now \| Orders can be expected around Fri, Jan 23, 2026 Regular price $59.50 AUD Regular price ~~$71.40 AUD~~ Sale price $59.50 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Quantity Required Backorder: Out of Stock.
K-0400-0400-2500B-3 (PK-50) --- Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key Sale K-0400-0400-2500B-3 (PK-50) --- Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key Regular price $59.50 AUD Regular price ~~$71.40 AUD~~ Sale price $59.50 AUD Unit price per Priced, Stocked and Sold Per 50 Units Excludes GST and overseas Taxes & Duties Out of stock! Backorder Now Sale
Machine Keys - 4x4x25 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1680
Part Number: K-0400-0400-2500A-C (PK-5) 42 units (210 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $1.86 AUD Regular price ~~$3.36 AUD~~ Sale price $1.86 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties Quantity Required Larger quantities than the 42 available can be backordered.
Machine Keys - 4x4x25 mm - Carbon Steel Key
Width (W) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0 / - 0.030} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel Finish: Plain Category: Keys - Machine - Carbon Steel Additional stock available from USA subject to Prior Sale = 1680
Part Number: K-0400-0400-2500A-C (PK-5) 42 units (210 pcs) Available Now \| Further orders can be expected around Fri, Jan 23, 2026 Regular price $1.86 AUD Regular price ~~$3.36 AUD~~ Sale price $1.86 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties Quantity Required 42 units (210 pcs) Available Now. Backorder if more than 42.
K-0400-0400-2500A-C (PK-5) --- Machine Keys - 4x4x25 mm - Carbon Steel Key Sale K-0400-0400-2500A-C (PK-5) --- Machine Keys - 4x4x25 mm - Carbon Steel Key Regular price $1.86 AUD Regular price ~~$3.36 AUD~~ Sale price $1.86 AUD Unit price per Priced, Stocked and Sold Per 5 Units Excludes GST and overseas Taxes & Duties 42 Available Now Sale
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2500AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity
Machine Keys - 4x4x25 mm - Carbon Steel C45 Key
Width (W) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Height (h) 4.00 mm _{+ 0.030 / - 0.0} (Equiv. 0.157 in.)	Length (L) 25.00 mm _{+/- 0.25} (Equiv. 0.984 in.)
Material: Carbon Steel C45 Finish: Plain Category: Keys - Machine - Carbon Steel
Part Number: K-0400-0400-2500AO-C (Each) Contact Us \| Special Order Only - Please contact us if you need a large quantity \| Orders can be expected around Wed, Sep 13, 2028

Miniature Bearings Australia

Collection: Keys - Machine

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K-0400-0400-1500A-3 (Each) --- Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-1500A-3 (Each) --- Machine Keys - 4x4x15 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-1500A-C (PK-375) --- Machine Keys - 4x4x15 mm - Carbon Steel Key

K-0400-0400-1500A-C (PK-375) --- Machine Keys - 4x4x15 mm - Carbon Steel Key

K-0400-0400-1600A-C (PK-10) --- Machine Keys - 4x4x16 mm - Carbon Steel Key

K-0400-0400-1600A-C (PK-10) --- Machine Keys - 4x4x16 mm - Carbon Steel Key

K-0400-0400-1600B-C (PK-100) --- Machine Keys - 4x4x16 mm - Carbon Steel C45 Key

K-0400-0400-1600B-C (PK-100) --- Machine Keys - 4x4x16 mm - Carbon Steel C45 Key

K-0400-0400-1600AB-C (Each) --- Machine Keys - 4x4x16 mm - Carbon Steel Key

K-0400-0400-1600AB-C (Each) --- Machine Keys - 4x4x16 mm - Carbon Steel Key

K-0400-0400-1800A-C (PK-50) --- Machine Keys - 4x4x18 mm - Carbon Steel Key

K-0400-0400-1800A-C (PK-50) --- Machine Keys - 4x4x18 mm - Carbon Steel Key

K-0400-0400-1800A-6 (Each) --- Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key

K-0400-0400-1800A-6 (Each) --- Machine Keys - 4x4x18 mm - Stainless Steel 316 Similar to A4, 18-10 Key

K-0400-0400-2000A-C (PK-5) --- Machine Keys - 4x4x20 mm - Carbon Steel Key

K-0400-0400-2000A-C (PK-5) --- Machine Keys - 4x4x20 mm - Carbon Steel Key

K-0400-0400-2000A-6 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key

K-0400-0400-2000A-6 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 316 Similar to A4, 18-10 Key

K-0400-0400-2000AB-C (Each) --- Machine Keys - 4x4x20 mm - Carbon Steel Key

K-0400-0400-2000AB-C (Each) --- Machine Keys - 4x4x20 mm - Carbon Steel Key

K-0400-0400-2000A-3 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-2000A-3 (Each) --- Machine Keys - 4x4x20 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-2000B-C (PK-100) --- Machine Keys - 4x4x20 mm - Carbon Steel C45 Key

K-0400-0400-2000B-C (PK-100) --- Machine Keys - 4x4x20 mm - Carbon Steel C45 Key

K-0400-0400-2500B-C (PK-50) --- Machine Keys - 4x4x25 mm - Carbon Steel C45 Key

K-0400-0400-2500B-C (PK-50) --- Machine Keys - 4x4x25 mm - Carbon Steel C45 Key

K-0400-0400-2500B-3 (PK-50) --- Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-2500B-3 (PK-50) --- Machine Keys - 4x4x25 mm - Stainless Steel 303 Similar to A2, 304, 18-8 Key

K-0400-0400-2500A-C (PK-5) --- Machine Keys - 4x4x25 mm - Carbon Steel Key

K-0400-0400-2500A-C (PK-5) --- Machine Keys - 4x4x25 mm - Carbon Steel Key

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Miniature Bearings Australia

Collection: Keys - Machine

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