Internal External Tooth Star Washers

Standard ANSI Hardware
Manufacturing Processes
Applications and Design

Notes:

• Reference per. ANSI/ASME B18.21.1 Size Data
• All data is given in inches except whole numbers

Size Designation Type 1 & 2	A		B		C
	Max.	Min.	Max.	Min.	Max.	Min.
4	.123	.115	.475 .510 .610	.460 .495 .580	.021 .021 .021	.016 .017 .017
6	.150	.141	.510 .610 .690	.495 .580 .670	.028 .028 .028	.023 .023 .023
8	.176	.168	.610 .690 .760	.580 .670 .740	.034 .034 .034	.028 .028 .028
10	.204	.195	.610 .690 .760 .900	.580 .670 .740 .880	.034 .040 .040 .040	.028 .032 .032 .032
12	.231	.221	.690 .760 .900 .985	.670 .725 .880 .965	.040 .040 .040 .045	.032 .032 .032 .037
1 / 4	.267	.256	.760 .900 .985 1.070	.725 .880 .965 1.045	.040 .045 .045 .045	.032 .037 .037 .037
5 / 16	.332	.320	.900 .985 1.070 1.155	.865 .965 1.045 1.130	040 .045 .050 .050	.032 .037 .042 .042
3 / 8	.398	.384	.985 1.070 1.070 1.260	.965 1.045 1.130 1.220	.045 .050 .050 .050	.037 .042 .042 .042
7 / 16	.464	.448	1.070 1.155 1.260 1.315	1.045 1.130 1.220 1.290	.050 .050 .055 .055	.042 .042 .047 .047
1 / 2	.530	.512	1.260 1.315 1.410 1.620	1.220 1.290 1.380 1.590	.055 .055 .060 .067	.047 .047 .052 .059
9 / 16	.596	.576	1.315 1.430 1.620 1.830	1.290 1.380 1.590 1.797	.055 .060 .067 .067	.047 .052 .059 .059
5 / 8	.663	.640	1.410 1.620 1.830 1.975	1.380 1.590 1.797 1.935	.060 .067 .067 .067	.058 .059 .059 .059

Related

• Illustrative Washer Type Guide Illustration guide to the application of washers for designers
• Flat Plain Washers Type A American National Standard Type A Plain Washers - Preferred Sizes ANSI/ASME B18.22.1
• Flat Plain Washers Type B Type B Plain Flat Washers, ANSI/ASME B18.22.1
• Split Lock Washer ASME B18.2.2 Helical Spring Lock Washers ANSI/ASME B18.21.1
• DIN 6797 Toothed lock washers, metric
• American Metric Washers s ANSI B18.22M Size Table
• DIN 6798 Serrated Lock Washers
• Metric Flat Washers Per. ANSI B18.22M
• ISO Flat Washer Size Table Chart ISO 7089
• etric, Flat Washers Specification DIN 125 Design Table
• Belleville Spring Washer Equation and Calculator