Mechanical Tolerance Standards Charts

The following is a recommended mechanical tolerance and hole sizes for standard ANSI Socket head fasteners.

SIZE	HEAD HEIGHT	TAPPED HOLE POSITION TOL	CLEARANCE HOLE DIA. TOL. LIMITS	HOLE POSITIONAL TOLERANCE	HEAD DIAMETER	COUNTERBORE DIA. TOLERANCE LIMITS
.060-80 #0	.060	.005	.073 .068	.003	.096	.130 .123
.086-56/64 #2	.086	.008	.107 .100	.006	.140	.177 .170
.112-40/48 #4	.112	.009	.137 .127	.006	.183	.230 .211
.138-32/40 #6	.138	.014	.174 .164	.012	.226	.274 .264
.164-32/36 #8	.164	.016	.203 .192	.012	.270	.326 .314
.190-24/32 #10	.190	.022	.238 .226	.014	.312	.394 .372
.250-20/28	.250	.024	.300 .288	.014	.375	.457 .435
.3125-18/24	.3125	.024	.371 .351	.014	.468	.552 .528
.375-16/24	.375	.024	.435 .415	.016	.563	.654 .625
.4375-14/20	.4375	.024	.4975 .478	.016	.656	.742 .718
.500-13/20	.500	.024	.564 .544	.020	.750	.840 .816
.625-11/18	.625	.028	.693 .673	.020	.938	1.032 1.008
.750-10/16	.750	.028	.818 .798	.020	1.125	1.217 1.195
.875-9/14	.875	.028	.943 .923	.020	1.313	1.407 1.383
1.00-8/12	1.00	.028	1.068 1.048	.020	1.500	1.594 1.570

© Copyright 2000 - 2012, by Engineers Edge, LLC All rights reserved.
Disclaimer