Item # PWA.531-.5N, Type A Plain Washer, 0.531" I.D. On Sales Systems Ltd.

Preferred sizes are for the most part from series previously designated "Standard Plate" and "SAE." Where common sizes existed in the two series, the SAE size is designated "N" (narrow) and the Standard Plate "W" (wide). These sizes as well as all other sizes of Type A Plain Washers are to be ordered by ID, OD and thickness dimensions.
Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes.
The 0.734 in., 1.156 in. and 1.469 in. outside diameters avoid washers which could be used in coin operated devices.

Unit of Measure

Manufacturer | Specifications | Codes and Standards

N/A Industrial Fasteners Institute

Product	N/A Washers
Unit of Measure	N/A English
Nominal Washer Size	N/A 1/2 in
Nominal Washer Size (Decimal)	N/A 0.5000 in
Standard Plate Size	N/A Narrow
Basic Inside Diameter (A)	N/A 0.531 in
Tolerance for Inside Diameter (A)	N/A +0.015 in-0.005 in
Basic Outside Diameter (B)	N/A 1.062 in
Tolerance for Outside Diameter (B)	N/A +0.030 in-0.007 in
Basic Thickness (C)	N/A 0.095 in
Max. Thickness (C)	N/A 0.121 in
Min. Thickness (C)	N/A 0.074 in

N/A ASME B18.22.1 1965 (R1998)

Manufacturer