Machinery's Handbook, 31st Edition
Fasteners for Structural Applications 1709 Finish: Unless otherwise specified, washers shall be supplied with a plain (as processed) finish. If zinc coatings are required, they shall be in accordance with ASTM F 436. Materials: Materials shall conform to the requirements established by ASTM F 436. Workmanship: Washers shall be free from burrs, seams, laps, loose scale, irregular sur faces, and any defects affecting serviceability. Designation: Washers shall be designated by the following data in the sequence shown: product name, nominal size (fraction or decimal), material specification, protective finish. See example below: Example: Hardened Steel Circular Washer, 1 1 ∕ 8 ASTM F 436, Hot-Dip Galvanized in Accordance with ASTM A153 Class C. Identification Symbols: Grade and source marking and symbols shall conform to the requirements of ASTM F436. The source marking is intended to identify the source accepting the responsibility for the conformance to this and other applicable specifications. Quality Assurance: Unless otherwise specified, products shall be furnished in accor dance with ANSI/ASME B18.18-2017 as noted in Dimensional Characteristics . Dimensional Characteristics: Washers shall conform to the dimensions indicated in Table 7 . The designated characteristics defined in Table 7 , Note (1) shall be inspected in accordance with ANSI/ASME B18.18-2017. For nondesignated characteristics, the provisions of ANSI/ASME B18.18-2017 shall also apply. Should a nondesignated dimension be determined to have a variance, it shall be deemed conforming to this Standard if the user, who is the installer, accepts the variance based on fit, form, and function considerations. Where verifiable in-process inspection is used in accordance with ANSI/ASME B18.18-2017, the final inspection level sample sizes of those respective standards shall apply. Beveled Washers.— Dimensions: All square beveled and clipped square beveled washers shall conform to the dimensions shown in Table 8. Tolerances: Tolerances for inside diameter for beveled washers shall be in accordance with Table 8 . The flatness shall not exceed 0.010 inch as the maximum deviation from a straight edge placed on the cut side. Burrs shall not project above immediately adjacent washer surface more than 0.010 inch. Finish: Unless otherwise specified, washers shall be supplied with a plain (as-processed) finish. If zinc coatings are required, they shall be in accordance with ASTM F 436. Materials and Mechanical Properties: Materials and properties shall conform to the requirements established by ASTM F 436. Workmanship: Washers shall be free from burrs, seams, laps, loose scale, irregular sur faces, and any defects affecting serviceability. Designation: Washers shall be designated by the following data in the sequence shown: product name, nominal washer size (fraction or decimal), material specification, protec tive finish. See example below: Example: Square Beveled Washer, 1 1 ∕ 4 ASTM F 436, hot-dip galvanized in accordance with ASTM A153 Class C.
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