Item # PWA.281-.25N, Type A Plain Washer, 0.281" 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 1/4 in
Nominal Washer Size (Decimal)	N/A 0.2500 in
Standard Plate Size	N/A Narrow
Basic Inside Diameter (A)	N/A 0.281 in
Tolerance for Inside Diameter (A)	N/A +0.015 in-0.005 in
Basic Outside Diameter (B)	N/A 0.625 in
Tolerance for Outside Diameter (B)	N/A +0.015 in-0.005 in
Basic Thickness (C)	N/A 0.065 in
Max. Thickness (C)	N/A 0.080 in
Min. Thickness (C)	N/A 0.051 in

N/A ASME B18.22.1 1965 (R1998)

Manufacturer