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Flat Washer Information
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Normal
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Washer Diameter
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Washer Thickness
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Size
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Internal
max - min
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External
max - min
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Form A (Thick)
max - min
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Form B (Thin)
Max - min
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M3
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3,4 - 3,2
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7,0 - 6,7
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0,6 - 0,4
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-
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M4
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4,5 - 4,3
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9,0 - 8,7
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0,9 - 0,7
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-
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M5
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5,5 - 5,3
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10,0 - 9,7
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1,1 - 0,9
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-
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M6
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6,7 - 6,4
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12,5 - 12,1
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1,8 - 1,4
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0,9 - 0,7
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M8
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8,7 - 8,4
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17,0 - 16,6
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1,8 - 1,4
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1,1 - 0,9
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M10
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10,9 - 10,5
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21,0 - 20,5
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2,2 - 1,8
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1,45 - 1,05
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M12
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13,4 - 13,0
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24,0 - 23,5
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2,7 - 2,3
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1,8 - 1,4
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M16
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17,4 - 17,00
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30,0 - 29,5
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3,3 - 2,7
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2,2 - 1,8
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M20
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21,5 - 21,0
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37,0 - 36,2
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3,3 - 2,7
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2,2 - 1,8
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M24
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25,5 - 25,0
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44,0 - 43,2
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4,3 - 3,7
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2,7 - 2,3
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M30
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31,6 - 31,0
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56,0 - 55,0
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4,3 - 3,7
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2,7 - 2,3
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M36
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37,6 - 37,0
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66,0 - 65,0
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5,6 - 4,4
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3,3 - 2,7
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Washers provide a greater bearing surface under the fastener. This helps prevent a nut, bolt or screw from pulling through the material.
Flat washers.
Used under the head of a bolt or nut to distribute the forces applied when tightening.
Spring washers.
Lock washers place tension against a nut after tightening, to help prevent the nut from loosening.
External tooth lock washers (Serrated).
Uses external teeth for locking and tension.
Internal tooth lock washers (Serrated).
Uses internal teeth for locking and tension. Less aggressive than external with a smaller outside diameter.
Repair Washer (Penny Washers).
Repair washers have larger outside diameters than standard washers. Each size is available with various outside diameters . Usually 1/16 thick. Used to attach machine thread fasteners. Available in several styles and materials.
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