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Wrench Clearance Chart data derived from SAE drafting manual and ANSI/ASME B18.2.2-1987 (R1999) wrench opining for nuts. This represents the recommended installation clearances for standard SAE 12 Point Box Wrenches.
Note: All dimensions are in inches
| Wrench Size |
Bolt Center - Wall Clearance Minimum
A |
Minimum Bolt Spacing
B |
Minimum Recommended Wrench-Wall Clearance
C |
Wrench Thickness Maximum
D |
| 0.156 |
0.190 |
0.280 |
0.030 |
0.156 |
| 0.188 |
0.200 |
0.309 |
0.030 |
0.172 |
| 0.250 |
0.270 |
0.410 |
0.030 |
0.250 |
| 0.312 |
0.300 |
0.480 |
0.030 |
0.281 |
| 0.344 |
0.300 |
0.500 |
0.030 |
0.281 |
| 0.375 |
0.340 |
0.560 |
0.030 |
0.344 |
| 0.438 |
0.400 |
0.650 |
0.030 |
0.359 |
| 0.500 |
0.450 |
0.740 |
0.030 |
0.375 |
| 0.562 |
0.500 |
0.830 |
0.030 |
0.406 |
| 0.594 |
0.530 |
0.870 |
0.030 |
0.469 |
| 0.625 |
0.560 |
0.920 |
0.030 |
0.469 |
| 0.688 |
0.590 |
0.990 |
0.030 |
0.531 |
| 0.750 |
0.660 |
1.090 |
0.030 |
0.594 |
| 0.781 |
0.690 |
1.014 |
0.030 |
0.594 |
| 0.812 |
0.720 |
1.019 |
0.030 |
0.594 |
| 0.875 |
0.750 |
1.026 |
0.030 |
0.594 |
| 0.938 |
0.780 |
1.032 |
0.030 |
0.656 |
| 1.000 |
0.810 |
1.039 |
0.030 |
0.718 |
| 1.062 |
0.840 |
1.045 |
0.030 |
0.781 |
| 1.125 |
0.950 |
1.060 |
0.030 |
0.844 |
| 1.250 |
0.980 |
1.700 |
0.030 |
0.875 |
| 1.312 |
1.090 |
1.850 |
0.030 |
0.906 |
| 1.438 |
1.220 |
2.050 |
0.030 |
1.000 |
| 1.500 |
1.270 |
2.140 |
0.030 |
1.062 |
| 1.625 |
1.340 |
2.280 |
0.030 |
1.156 |
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