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Din 439 Check Nuts are standard nuts with a reduced height in comparison to the hexagon full nut. Also known as ‘check’ nuts; they are commonly used with any male fastener with the same thread diameter and pitch, used to mate a stack or single part together.

Standard Followed for DIN 439 Check Nuts

  • BS 3692
  • BS 57
  • IS/ 1363
  • IS/ 1367
Din 439 Lock Nuts graph

All measurements in millimeters (mm)

d1 s e m
M2 4 4.32 1.2
M3 5.5 6.01 1.8
M4 7 7.66 2.2
M5 8 8.79 2.7
M6 10 11.05 3.2
M8 13 14.38 4
M10 17 18.9 5
M12 19 21.1 6
M14 22 24.49 7
M16 24 26.75 8
M18 27 29.56 9
M20 30 32.95 10
M22 32 35.03 11
M24 36 39.55 12
M27 41 45.2 13.5
M30 46 50.85 15
M33 50 55.37 16.5
M36 55 60.79 18