5-Pack 304 Stainless Steel Wedge Lock Washers M3–M20
5-Pack 304 Stainless Steel Wedge Lock Washers M3–M20
304 Stainless Steel Wedge Lock Washers – 5-Pack (M3 to M20)
Keep your bolted joints secure with these heavy-duty 304 stainless steel wedge lock washers. Engineered with a Dacromet-coated finish and a precision wedge profile, these self-locking washers bite into mating surfaces to prevent loosening caused by vibration, shock, and thermal cycling — making them an essential hardware fastener for machinery, automotive assemblies, construction, and DIY projects.
Each pack contains 5 washers in your chosen size, available from M3 through M20. The cam-shaped locking geometry creates a secure, rattle-proof connection that outperforms standard flat or spring washers in demanding applications.
Key Features
- Material: 304 Stainless Steel with Dacromet coating for excellent corrosion resistance
- Locking Mechanism: Wedge cam design grips under load to prevent bolt loosening
- Wide Size Range: M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20
- Quantity: 5 washers per pack
- Versatile Use: Ideal for automotive, industrial machinery, construction, electronics, and general hardware
- Brand New & High Quality: Precision-manufactured to consistent dimensional tolerances
Size Chart (Inner Dia × Outer Dia × Thickness)
| Size | Inner Dia (mm) | Outer Dia (mm) | Thickness (mm) |
|---|---|---|---|
| M3 | 3.4 | 7.2 | 2.2 |
| M4 | 4.4 | 7.6 | 2.2 |
| M5 | 5.4 | 9.0 | 2.2 |
| M6 | 6.5 | 10.8 | 2.2 |
| M8 | 8.7 | 13.5 | 2.2 |
| M10 | 10.7 | 16.6 | 2.0 |
| M12 | 13.0 | 19.5 | 2.0 |
| M14 | 15.2 | 23.0 | 3.0 |
| M16 | 17.0 | 25.4 | 3.0 |
| M18 | 19.5 | 29.0 | 3.0 |
| M20 | 21.4 | 30.7 | 3.0 |
Package Contents
- 5 × Wedge Lock Washers (your selected size)
Made in Mainland China.
Note: Actual colour may vary slightly from on-screen images due to monitor settings. Allow ±0.1 mm manual measurement tolerance. 1 cm = 0.39 inches.
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Frequently Asked Questions
Q: What makes wedge lock washers better than standard lock washers?
A: Wedge lock washers feature a cam-shaped surface with radial teeth. When a bolt is tightened, the cam faces engage, and any loosening attempt actually increases the clamp force — far more secure than traditional spring or toothed lock washers in high-vibration environments.
Q: Are these 304 stainless steel wedge lock washers suitable for outdoor use?
A: Yes. The 304 stainless steel construction combined with the Dacromet coating provides strong resistance to corrosion, making these washers well-suited for outdoor, marine-adjacent, and damp environments.
Q: Which bolt sizes do these lock washers fit?
A: These wedge lock washers are available in M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, and M20 metric bolt sizes. Select your required size from the variant options above to match your hardware application.