Mechanical Tolerance Standards Charts
The following is a recommended mechanical tolerance and hole sizes for standard ANSI hex head fasteners. Note that all dimensional data and tolerances are given in inch units.
SIZE |
HEAD HEIGHT |
TAPPED HOLE POSITION TOL
 |
CLEARANCE HOLE DIA.
TOL. LIMITS |
HOLE POSITIONAL TOLERANCE
 |
HEAD WIDTH FLAT-FLAT |
.073-64/72 #1 |
.050 |
.005 |
.073 .068 |
.003 |
.125 |
.086-56/64 #2 |
.086 |
.008 |
.107 .100 |
.006 |
.140 |
.112-40/48 #4 |
.112 |
.009 |
.137 .127 |
.006 |
.183 |
.138-32/40 #6 |
.138 |
.014 |
.174 .164 |
.012 |
.226 |
.164-32/36 #8 |
.164 |
.016 |
.203 .192 |
.012 |
.270 |
.190-24/32 #10 |
.190 |
.022 |
.238 .226 |
.014 |
.312 |
.250-20/28 |
.250 |
.024 |
.300 .288 |
.014 |
.375 |
.3125-18/24 |
.3125 |
.024 |
.371 .351 |
.014 |
.468 |
.375-16/24 |
.375 |
.024 |
.435 .415 |
.016 |
.563 |
.4375-14/20 |
.4375 |
.024 |
.4975 .478 |
.016 |
.656 |
.500-13/20 |
.500 |
.024 |
.564 .544 |
.020 |
.750 |
.625-11/18 |
.625 |
.028 |
.693 .673 |
.020 |
.938 |
.750-10/16 |
.750 |
.028 |
.818 .798 |
.020 |
1.125 |
.875-9/14 |
.875 |
.028 |
.943 .923 |
.020 |
1.313 |
1.00-8/12 |
1.00 |
.028 |
1.068 1.048 |
.020 |
1.500 |
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