Machinery's Handbook, 31st Edition
Washers 1773 Washer Designations: The Standard specifies the details that should be given when ordering or placing an inquiry for washers. These details are the general description, namely, bright or black washers; the nominal size of the bolt or screw involved, for example, M5; the designated form, for example, Form A or Form E; the dimensions of any chamfer required on bright washers; the number of the Standard BS 4320:1968 (1998), and coating information if required, with the number of the appropriate British Standard and the coating thickness needed. As an example, in the use of this information, the designation for a chamfered, normal-diameter series washer of normal-range thickness to suit a 12-mm diameter bolt would be: Bright washers M12 (Form A) chamfered to BS 4320. British Standard Bright Metal Washers.—Metric Series BS 4320:1968 (1998) NORMAL DIAMETER SIZES Nominal Thickness
Inside Diameter
Outside Diameter
Size of Bolt or Screw M 1.0 M 1.2 (M 1.4) M 1.6 M 2.0 (M 2.2) M 2.5 M3 M4 (M 3.5) (M 4.5) M 5 M 6 (M 7) M 8 M 10 M 12 (M 14) M 16 (M 18) M 20 (M 22) M24 (M 27) M30 (M 33) M 36 (M 39) Nominal Size of Bolt or Screw
Form A (Normal Range)
Form B (Light Range)
Nom.
Max.
Min.
Nom.
Max.
Min. Nom. Max. Min. Nom.
Max.
Min.
1.1 1.3 1.5 1.7 2.2 2.4 2.7 3.2 3.7 4.3 4.8 5.3 6.4 7.4 8.4
1.25 1.1 1.45 1.3 1.65 1.5 1.85 1.7 2.35 2.2 2.55 2.4 2.85 2.7
2.5 3.0 3.0 4.0 5.0 5.0 6.5
2.5 3.0 3.0 4.0 5.0 5.0 6.5
2.3 0.3 0.4 0.2 … … … 2.8 0.3 0.4 0.2 … … … 2.8 0.3 0.4 0.2 … … … 3.7 0.3 0.4 0.2 … … … 4.7 0.3 0.4 0.2 … … … 4.7 0.5 0.6 0.4 … … … 6.2 0.5 0.6 0.4 … … … 6.7 0.5 0.6 0.4 … … … 6.7 0.5 0.6 0.4 … … … 8.7 0.8 0.9 0.7 … … … 8.7 0.8 0.9 0.7 … … … 9.7 1.0 1.1 0.9 … … …
3.4 3.9 4.5 5.0 5.5 6.7 7.7 8.7
3.2 3.7 4.3 4.8 5.3 6.4 7.4 8.4
7 7 9 9
7 7 9 9
10
10
12.5 12.5 12.1 1.6 1.8 1.4 0.8
0.9 0.9 1.1 1.8 2.2 2.2 2.2 2.2 2.7 2.7 2.7 3.3 3.3 3.3
0.7 0.7 0.9 1.4 1.8 1.8 1.8 1.8 2.3 2.3 2.3 2.7 2.7 2.7
14 17
14 17 21 24 28 30 34 37 39 44 50 56 60 66 72
13.6 1.6 1.8 1.4 0.8 16.6 1.6 1.8 1.4 1.0 23.5 2.5 2.7 2.3 1.6 27.5 2.5 2.7 2.3 1.6 29.5 3.0 3.3 2.7 2.0 33.2 3.0 3.3 2.7 2.0 36.2 3.0 3.3 2.7 2.0 38.2 3.0 3.3 2.7 2.0 43.2 4.0 4.3 3.7 2.5 49.2 4.0 4.3 3.7 2.5 55.0 4.0 4.3 3.7 2.5 59.0 5.0 5.6 4.4 3.0 65.0 5.0 5.6 4.4 3.0 71.0 6.0 6.6 5.4 3.0
10.5 10.9 10.5 21 13.0 13.4 13.0 24 15.0 15.4 15.0 28 17.0 17.4 17.0 30 19.0 19.5 19.0 34
20.5 2.0 2.2 1.8 1.25 1.45 1.05
1.80 1.40
21 23 25 28 31 34 37 40
21.5 21 23.5 23 25.5 25 28.5 28 31.6 31 34.6 34 37.6 37 40.6 40
37 39 44 50 56 60 66 72
LARGE DIAMETER SIZES
Thickness
Inside Diameter
Outside Diameter
Form D (Light Range)
Form C (Normal Range)
Nom.
Max. 4.5 5.5 6.7 8.7
Min. 4.3 5.3 6.4 8.4
Nom.
Max.
Min. Nom. Max. Min. Nom.
Max.
Min.
M 4 M 5 M 6 M 8
4.3 5.3 6.4 8.4
10.0 10.0 12.5 12.5
9.7 0.8 0.9 0.7 … … … 12.1 1.0 1.1 0.9 … … …
14 21
14 21 24 28 30 34 37 39 44 50 56 60 66 72 77
13.6 1.6 1.8 1.4 0.8 20.5 1.6 1.8 1.4 1.0 27.5 2.5 2.7 2.3 1.6 29.5 2.5 2.7 2.3 1.6 33.2 3.0 3.3 2.7 2.0 36.2 3.0 3.3 2.7 2.0 38.2 3.0 3.3 2.7 2.0 43.2 3.0 3.3 2.7 2.0 49.2 4.0 4.3 3.7 2.5
0.9 1.1 1.8 1.8 2.2 2.2 2.2 2.2 2.7 2.7 2.7 3.3 3.3 3.3
0.7 0.9 1.4 1.4 1.8 1.8 1.8 1.8 2.3 2.3 2.3 2.7 2.7 2.7
M 10 M 12 (M 14) M 16 (M 18) M 20 (M 22) M 24 (M 27) M 30 (M 33) M 36 (M 39)
10.5 10.9 10.5 24 13.0 13.4 13.0 28
23.5 2.0 2.2 1.8 1.25 1.45 1.05
15.0 15.4 15 17.0 17.4 17 19.0 19.5 19
30 34 37 39 44 50 56 60 66 72 77
21 23 25 28 31 34 37 40
21.5 21 23.5 23 25.5 25 28.5 28 31.6 31 34.6 34 37.6 37 40.6 40
55 59 65 71 76
4.0 4.3 3.7 2.5 4.0 4.3 3.7 2.5 5.0 5.6 4.4 3.0 5.0 5.6 4.4 3.0 6.0 6.6 5.4 3.0
All dimensions are in millimeters. Nominal bolt or screw sizes shown in parentheses are nonpreferred.
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