SAE 12 Point Box Wrench Clearance Sizes Table Chart

General Engineering Reviews | Engineering Applications and Design

Wrench Clearance Chart data derived from SAE drafting manual and ANSI/ASME B18.2.2-1987 (R1999) wrench opening 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	1.140	0.030	0.594
0.812	0.720	1.190	0.030	0.594
0.875	0.750	1.260	0.030	0.594
0.938	0.780	1.320	0.030	0.656
1.000	0.810	1.390	0.030	0.718
1.062	0.840	1.450	0.030	0.781
1.125	0.950	1.600	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