Internal Star Lock Washers

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Star Washer

Introduction

IS - 5371 - 1982

An internal star washer is a type of washer that is designed to be used on the inside of a component or assembly. It has a series of teeth or notches along the inner edge that help to grip and hold onto the surface of the fastener and the material being fastened, helping to prevent loosening due to vibration or torque. Internal star washers are often used in applications where there is limited space or access to the outside of the component, or where a low profile is desired. They can be used with a variety of fastener types and sizes and are available in a variety of materials, including steel, stainless steel, brass, and plastic.

Internal Star Lock Washers

Star Washer

Available In Stainless Steel, Plain Or Zinc Plated Finishes. Stocked In Sizes From #2 To 1 1/4.

Nominal Washer Size A B C
  Inside Diameter Outside Diameter thickness
  MAX MIN MAX MIN MAX MIN
2 0.086 0.092 0.089 0.200 0.175 0.015 0.010
4 0.112 0.123 0.115 0.270 0.245 0.019 0.015
6 0.138 0.150 0.141 0.295 0.275 0.021 0.017
8 0.164 0.176 0.168 0.340 0.325 0.023 0.018
10 0.190 0.204 0.195 0.381 0.365 0.025 0.020
12 0.216 0.231 0.221 0.410 0.394 0.025 0.020
1/4 0.250 0.267 0.256 0.478 0.460 0.028 0.023
5/16 0.312 0.332 0.320 0.610 0.594 0.034 0.028
3/8 0.375 0.398 0.384 0.692 0.670 0.040 0.032
7/16 0.438 0.464 0.448 0.789 0.741 0.040 0.032
1/2 0.500 0.530 0.512 0.900 0.867 0.045 0.037
5/8 0.625 0.663 0.640 1.071 1.045 0.050 0.042
1/8 PIPE 0.425 0.410 0.615 0.595 0.022 0.017  
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