DIN 127Spring lock washer
DIN 127 M4 Spring lock washer
DIN 127 M4 is a spring lock washer, on a M4 × 0.7 mm metric thread. A split helical spring washer intended to resist loosening. Worth knowing that independent testing has repeatedly found its locking effect is marginal once the joint is properly preloaded — for safety critical joints use a prevailing torque nut instead.
Diameter4 mm
Pitch0.7 mm
Socket size s0.9 mm
Inside Ø d14.1 mm
Thickness h1.8 mm
Dimensions
- Standard
- DIN 127
- Type
- Spring lock washer
- Size
- M4
- Thread
- M4 × 0.7
- Socket size s
- 0.9 mm
- Total height h
- 1.8 mm
- Inside diameter d1
- 4.1 mm
Nominal values in millimetres as published in DIN 127.
Thread data
Full M4 thread pageDesignationM4 × 0.7
Pitch0.7 mm
Major Ø4 mm
Pitch Ø3.55 mm
Minor Ø ext3.14 mm
Tap drillØ 3.3 mm