DIN 127Spring lock washer

DIN 127 M12 Spring lock washer

DIN 127 M12 is a spring lock washer, on a M12 × 1.5 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.

Dimensioned drawing — DIN 127 M12d2 16⌀12.2h 5
DIN 127 M12 — Spring lock washerNominal dimensions in mm · Not to scale
Diameter12 mm
Pitch1.5 mm
Socket size s2.5 mm
Inside Ø d112.2 mm
Thickness h5 mm

Dimensions

Standard
DIN 127
Type
Spring lock washer
Size
M12
Thread
M12 × 1.5
Socket size s
2.5 mm
Total height h
5 mm
Inside diameter d1
12.2 mm

Nominal values in millimetres as published in DIN 127.

Thread data

Full M12 thread page
DesignationM12 × 1.5 fine
Pitch1.5 mm
Major Ø12 mm
Pitch Ø11.03 mm
Minor Ø ext10.16 mm
Tap drillØ 10.5 mm

Other lengthsDIN 127 M12

All M12 specifications
M12