What Is a DIN 127 Split Lock Washer?
DIN 127 Split Lock Washers
Spring Lock Washers | Helical Split Washers
DIN 127 defines helical spring lock washers (split washers) that provide tension and resist loosening through spring action. The split design creates a sharp edge that bites into both the fastener and surface. Available in Form A (standard) and Form B (heavy duty).
Quick Specifications
Dimension Chart (Form A)
| For Bolt | ID (d₁) | OD (d₂) | Thickness (s) |
|---|---|---|---|
| M3 | 3.1 mm | 6.2 mm | 0.8 mm |
| M4 | 4.1 mm | 8.2 mm | 0.9 mm |
| M5 | 5.1 mm | 9.2 mm | 1.2 mm |
| M6 | 6.1 mm | 11.8 mm | 1.6 mm |
| M8 | 8.1 mm | 14.8 mm | 2.0 mm |
| M10 | 10.2 mm | 18.1 mm | 2.5 mm |
| M12 | 12.2 mm | 21.1 mm | 3.0 mm |
| M16 | 16.2 mm | 27.4 mm | 3.5 mm |
| M20 | 20.2 mm | 33.6 mm | 4.0 mm |
How They Work
Spring Tension
The split creates spring action that maintains axial load even as the joint settles.
Bite Action
Sharp edges dig into the bearing surface and fastener, resisting rotation.
Indicator
A flattened washer indicates proper preload has been achieved.
⚠️ Modern Engineering Note
Recent studies suggest split lock washers provide limited vibration resistance compared to alternatives like Nord-Lock wedge washers or properly torqued hardened flat washers. Best suited for light-duty, non-critical applications.
Material Options
Spring Steel – Zinc
Hardened carbon steel with zinc plating. Standard choice for most applications.
A2 Stainless (304)
Corrosion-resistant stainless. Lower spring force than hardened steel.
Shop DIN 127 Split Lock Washers
Spring lock washers in steel and stainless. Form A and Form B available.
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