Mechanical Tolerance Standards Charts

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

The following are medium fits.  These fits have been calculated using the Fixed Fastener case and are line to line in worst case misalignment and size departure.

SIZE	HEAD HEIGHT	TAPPED HOLE POSITION TOL	CLEARANCE HOLE DIA. TOL. LIMITS	HOLE POSITIONAL TOLERANCE	HEAD DIAMETER	COUNTERBORE DIA. TOLERANCE LIMITS
.060-80 #0	.038	.010	.081 .076	.006	.116	.178 .162
.086-56/64 #2	.053	.012	.112 .105	.007	.167	.232 .210
.112-40/48 #4	.068	.016	.150 .142	.014	.219	.295 .273
.138-32/40 #6	.082	.022	.185 .174	.014	.270	.354 .330
.164-32/36 #8	.096	.024	.214 .202	.014	.322	.406 .382
.190-24/32 #10	.110	.028	.252 .236	.018	.373	.465 .441
.250-20/28	.144	.028	.312 .296	.018	.492	.562 .538
.3125-18/24	.178	.030	.381 .365	.022	.615	.689 .672
.375-16/24	.212	.030	.443 .427	.022	.740	.816 .797

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