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ISO Metric Crinkle Washers : General Engineering

(Dimensions in milimetres)
Inside Outside Height
Nominal diameter d1 diameter d2 h
(thread) Thickness
diameter max min max min max min s
M1.6 1.8 1.7 3.7 3.52 0.51 0.36 0.16
M2 2.3 2.2 4.6 4.42 0.53 0.38 0.16
M2.5 2.8 2.7 5.8 5.62 0.53 0.38 0.16
M3 3.32 3.2 6.4 6.18 0.61 0.46 0.16
M4 4.42 4.3 8.1 7.88 0.84 0.69 0.28
M5 5.42 5.3 9.2 8.98 0.89 0.74 0.30
M6 6.55 6.4 11.5 11.23 1.14 0.99 0.40
M8 8.55 8.4 15.0 14.73 1.40 1.25 0.40
M10 10.68 10.5 19.6 19.27 1.70 1.55 0.55
M12 13.18 13.0 22.0 21.67 1.90 1.65 0.55
(M14) 15.18 15.0 25.5 25.17 2.06 1.80 0.55
M16 17.18 17.0 27.8 27.47 2.41 2.16 0.70
(M18) 19.21 19.0 31.3 30.91 2.41 2.16 0.70
M20 21.21 21.0 34.7 34.31 2.66 2.16 0.70
Non-preferred and not usually stock sizes in brackets().


Type A Serrated Externally