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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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