Machinery's Handbook, 31st Edition
1708 Fasteners for Structural Applications Hardened Steel Washers Flat Washers.— Flat Washers Dimensions: All circular and circular clipped washers shall conform to the dimensions shown in Table 7. Table 7. Dimensions for Hardened Steel Circular and Circular Clipped Washers ANSI/ASME B18.2.6-2019
TOLERANCES
A B
E
C
A
Circular TOLERANCES A
Circular Clipped
Inside Diameter A
Outside Diameter B
Thickness C
Bolt Size or Nominal a Washer Size, Inch
Minimum Edge Distance E
Tolerance
Tolerance
Basic Washer
Plus Minus
Basic
Plus Minus Min.
Max.
0.531 0.0313 0 1.063 0.0313 0.0313 0.097 0.177 0.438 0.688 0.0313 0 1.313 0.0313 0.0313 0.122 0.177 0.547 0.813 0.0313 0 1.469 0.0313 0.0313 0.122 0.177 0.656 0.938 0.0313 0 1.750 0.0313 0.0313 0.136 0.177 0.766 1.125 0.0313 0 2.000 0.0313 0.0313 0.136 0.177 0.875 1.250 0.0313 0 2.250 0.0313 0.0313 0.136 0.177 0.984 1.375 0.0313 0 2.500 0.0313 0.0313 0.136 0.177 1.094 1.500 0.0313 0 2.750 0.0313 0.0313 0.136 0.177 1.203 1.625 0.0313 0 3.000 0.0313 0.0313 0.136 0.177 1.313
1 ∕ 5 ∕ 3 ∕ 7 ∕
2 8 4 8
1
1 1 ∕ 1 1 ∕ 1 3 ∕ 1 1 ∕
8 4 8 2
a Nominal washer sizes are intended for use with comparable nominal bolt diameters. General Notes: (1) Dimensional Conformance : Circular and circular clipped washers shall have the following characteristics inspected to ANSI/ASME B18.18-2017 to the inspection levels as follows: Width across corners, inspection level B; Visual, inspection level C. If verifiable in-process inspection is used, see Dimensional Characteristics on page 1709. (2) Nominal washer sizes are intended for use with comparable nominal bolt diameters. (3) Additional requirements are in Beveled Washers on page 1709. Flat Washers Tolerances: Washer inside diameter, outside diameter, thickness, and edge distance shall be in accordance with Table 7 . The deviation from flatness shall not exceed 0.010 inch as the maximum deviation from a straight edge placed on the cut side. Circular runout of the outside diameter with respect to the hole shall not exceed 0.030 FIM. Burrs shall not project above immediately adjacent washer surface more than 0.010 inch.
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