Washers British Standard Black Metal Washers.—Metric Series BS 4320:1968 (1998) NORMAL DIAMETER SIZES (Form E) Nom Bolt or Screw Size Inside Diameter Outside Diameter Thickness Nom. Max. Min. Nom. Max. Min. Nom. Max. Min. M 5 5.5 5.8 5.5 10.0 10.0 9.2 1.0 1.2 0.8 M 6 6.6 7.0 6.6 12.5 12.5 11.7 1.6 1.9 1.3 (M 7) 7.6 8.0 7.6 14.0 14.0 13.2 1.6 1.9 1.3 M 8 9.0 9.4 9.0 17 17 16.2 1.6 1.9 1.3 M 10 11.0 11.5 11.0 21 21 20.2 2.0 2.3 1.7 M 12 14 14.5 14 24 24 23.2 2.5 2.8 2.2 (M 14) 16 16.5 16 28 28 27.2 2.5 2.8 2.2 M 16 18 18.5 18 30 30 29.2 3.0 3.6 2.4 (M 18) 20 20.6 20 34 34 32.8 3.0 3.6 2.4 M 20 22 22.6 22 37 37 35.8 3.0 3.6 2.4 (M 22) 24 24.6 24 39 39 37.8 3.0 3.6 2.4 M 24 26 26.6 26 44 44 42.8 4 4.6 3.4 (M 27) 30 30.6 30 50 50 48.8 4 4.6 3.4 M 30 33 33.8 33 56 56 54.5 4 4.6 3.4 (M 33) 36 36.8 36 60 60 58.5 5 6.0 4.0 M 36 39 39.8 39 66 66 64.5 5 6.0 4.0 (M 39) 42 42.8 42 72 72 70.5 6 7.0 5.0 M 42 45 45.8 45 78 78 76.5 7 8.2 5.8 (M 45) 48 48.8 48 85 85 83 7 8.2 5.8 M 48 52 53 52 92 92 90 8 9.2 6.8 (M 52) 56 57 56 98 98 96 8 9.2 6.8 M 56 62 63 62 105 105 103 9 10.2 7.8 (M 60) 66 67 66 110 110 108 9 10.2 7.8 M 64 70 71 70 115 115 113 9 10.2 7.8 (M 68) 74 75 74 120 120 118 10 11.2 8.8 LARGE DIAMETER SIZES (Form F) M 8 9 9.4 9.0 21 21 20.2 1.6 1.9 1.3 M 10 11 11.5 11 24 24 23.2 2 2.3 1.7 M 12 14 14.5 14 28 28 27.2 2.5 2.8 2.2 (M 14) 16 16.5 16 30 30 29.2 2.5 2.8 2.2 M 16 18 18.5 18 34 34 32.8 3 3.6 2.4 (M 18) 20 20.6 20 37 37 35.8 3 3.6 2.4 M 20 22 22.6 22 39 39 37.8 3 3.6 2.4 (M 22) 24 24.6 24 44 44 42.8 3 3.6 2.4 M 24 26 26.6 26 50 50 48.8 4 4.6 3.4 (M 27) 30 30.6 30 56 56 54.5 4 4.6 3.4 M 30 33 33.8 33 60 60 58.5 4 4.6 3.4 (M 33) 36 36.8 36 66 66 64.5 5 6.0 4 M 36 39 39.8 39 72 72 70.5 5 6.0 4 (M 39) 42 42.8 42 77 77 75.5 6 7 5 EXTRA LARGE DIAMETER SIZES (Form G) M 5 5.5 5.8 5.5 15 15 14.2 1.6 1.9 1.3 M 6 6.6 7.0 6.6 18 18 17.2 2 2.3 1.7 (M 7) 7.6 8.0 7.6 21 21 20.2 2 2.3 1.7 M 8 9 9.4 9.0 24 24 23.2 2 2.3 1.7 M 10 11 11.5 11.0 30 30 29.2 2.5 2.8 2.2 M 12 14 14.5 14.0 36 36 34.8 3 3.6 2.4 (M 14) 16 16.5 16.0 42 42 40.8 3 3.6 2.4 M 16 18 18.5 18 48 48 46.8 4 4.6 3.4 (M 18) 20 20.6 20 54 54 52.5 4 4.6 3.4 M 20 22 22.6 22 60 60 58.5 5 6.0 4 (M 22) 24 24.6 24 66 66 64.5 5 6.0 4 M 24 26 26.6 26 72 72 70.5 6 7 5 (M 27) 30 30.6 30 81 81 79 6 7 5 M 30 33 33.8 33 90 90 88 8 9.2 6.8 (M 33) 36 36.8 36 99 99 97 8 9.2 6.8 M 36 39 39.8 39 108 108 106 10 11.2 8.8 (M39) 42 42.8 42 117 117 115 10 11.2 8.8 All dimensions are in millimeters. Nominal bolt or screw sizes shown in parentheses are nonpreferred. Machinery's Handbook, 31st Edition
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