Single Coil Rectangular Section Spring Washers : Metric Series, Type B and BP
(Dimensions in milimetres)
Nominal Inside Outside
Size Diameter Diameter Radius k
Diameter d1 Width Thickness d2 r (Type BP
d Max Min b s Max Max only)
M1.6 1.9 1.7 0.7+0.1 0.4+0.1 3.5 0.15
M2 2.3 2.1 0.9+0.1 0.5+0.1 0.5+0.1 4.3 0.15
(M2.2) 2.5 2.3 1.0+0.1 0.6+0.1 4.7 0.2 -
M2.5 2.8 2.6 1.0+0.1 0.6+0.1 5.0 0.2 -
M3 3.3 3.1 1.3+0.1 0.8+0.1 6.1 0.25 -
(M3.5) 3.8 3.6 1.3+0.1 0.8+0.1 6.6 0.25 -
M4 4.35 4.1 1.5+0.1 0.9+0.1 7.55 0.3 0.15
M5 5.35 5.1 1.8+0.1 1.2+0.1 9.15 0.3 0.15
M8 8.55 8.2 3+0.15 2+0.1 14.85 0.65 0.3
M10 10.6 10.2 3.5+0.2 2.2+0.15 18.0 0.7 0.3
M12 12.6 12.2 4+0.2 2.5+0.15 21.0 0.8 0.4
(M14) 14.7 14.2 4.5+0.2 3+0.15 24.1 1.0 0.4
M16 16.9 16.3 5+0.2 3.5+0.15 27.3 1.0 0.4
(M18) 19.0 18.3 5+0.2 3.5+0.2 29.4 1.15 0.4
M20 21.1 20.3 6+0.2 4+0.2 33.5 1.3 0.4
(M22) 23.3 22.4 6+0.2 4+0.2 35.7 1.3 0.4
M24 25.3 24.4 7+0.25 5+0.2 39.8 1.65 0.5
(M27) 28.5 27.5 7+0.25 5+0.2 43.0 1.65 0.5
M30 31.5 30.5 8+0.25 6+0.25 48.0 2.0 0.8
(M33) 34.6 33.5 10+0.25 6+0.25 55.1 2.0 0.8
M36 37.6 36.5 10+0.25 6+0.25 58.1 2.0 0.8
(M39) 40.8 39.6 10+0.25 6+0.25 61.3 2.0 0.8
M42 43.8 42.6 12+0.25 7+0.25 68.3 2.3 0.8
(M45) 46.8 45.6 12+0.25 7+0.25 71.3 2.3 0.8
M48 50.0 48.8 12+0.25 7+0.25 74.5 2.3 0.8
(M52) 54.1 52.8 14+0.25 8+0.25 82.6 2.65 1.0
M56 58.1 56.8 14+0.25 8+0.25 86.6 2.65 1.0
(M60) 62.3 60.9 14+0.25 8+0.25 90.8 2.65 1.0
M64 66.3 64.9 14+0.25 8+0.25 93.8 2.65 1.0
(M68) 70.5 69.0 14+0.25 8+0.25 99.00 2.65 1.0
Sizes shown in brackets are non-preferred and are not usually stock sizes.