DIN 127Spring lock washer

DIN 127 M20 Spring lock washer

DIN 127 M20 is a spring lock washer, on a M20 × 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 M20d2 16⌀20.2h 8
DIN 127 M20 — Spring lock washerNominal dimensions in mm · Not to scale
Diameter20 mm
Pitch1.5 mm
Socket size s4 mm
Inside Ø d120.2 mm
Thickness h8 mm

Dimensions

Standard
DIN 127
Type
Spring lock washer
Size
M20
Thread
M20 × 1.5
Socket size s
4 mm
Total height h
8 mm
Inside diameter d1
20.2 mm

Nominal values in millimetres as published in DIN 127.

Thread data

Full M20 thread page
DesignationM20 × 1.5 fine
Pitch1.5 mm
Major Ø20 mm
Pitch Ø19.03 mm
Minor Ø ext18.16 mm
Tap drillØ 18.5 mm

Other lengthsDIN 127 M20

All M20 specifications
M20