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BS 4395

Metric Flat Round Washers for High Strength Frict Grip Bolts

Dimensions of Metric Flat Round Washers for High Strength Frict Grip Bolts

Nom Size ø D1 ø D1 T
Max Min Max Min Max Min
M12 13.8 13.4 30.0 29.0 2.8 2.4
M16 17.8 17.4 37.0 36.0 3.4 3.0
M20 21.5 21.1 44.0 43.0 3.7 3.3
M22 23.4 23.0 50.0 48.5 4.2 3.8
M24 26.4 26.0 56.0 54.5 4.2 3.8
M27 29.4 29.0 60.0 58.5 4.2 3.8
M30 32.8 32.4 66.0 64.5 4.2 3.8
M33 35.8 35.4 75.0 73.5 4.6 4.2
M36 38.8 38.4 85.0 83.5 4.6 4.2

Metric Square Taper Washers for High Strength Frict Grip Bolts

Metric Square Taper Washers for High Strength Frict Grip Bolts

Nom Size T ø D A, Nom
3° & 5° Taper, Nom 8° Taper, Nom Max Min
M12 4.76 6.35 14.2 13.4 31.75
M16 4.76 6.35 18.2 17.4 38.10
M20 4.76 6.35 21.9 21.1 38.10
M22 4.76 6.35 23.8 23.0 44.45
M24 4.76 6.35 26.8 26.0 57.15
M27 4.76 6.35 29.8 29.0 57.15
M30 4.76 6.35 33.2 32.4 57.15
M33 4.76 6.35 36.2 35.4 57.15
M36 4.76 6.35 39.2 38.4 57.15

Notes

  • Sizes shown in brackets are non prefered
  • Sizes M16 to M30 inclusive are common to BS4395 parts 1 and 2. Sizes M12 and M36 are to part 1 only. Size M33 is to Part 2 only.