Machinery's Handbook, 31st Edition
1688
Wrench Clearances Table 1. Wrench Openings for Nuts ANSI/ASME B18.2.2-2015, Appendix
Max. a Width Across Flats of Nut
Max. a Width Across Flats of Nut
Max. a Width Across Flats of Nut
Wrench Opening b
Wrench Opening b
Wrench Opening b
Min. 0.158 0.190 0.220 0.252 0.283 0.316 0.347 0.378 0.440 0.504 0.566 0.629 0.692 0.755 0.818 0.880 0.944 1.006 1.068 1.132
Max. 0.163 0.195 0.225 0.257 0.288 0.322 0.353 0.384 0.446 0.510 0.573 0.636 0.699 0.763 0.826 0.888 0.953 1.015 1.077
Min. 1.257 1.320 1.383 1.446 1.508 1.634 1.696 1.822 1.885 2.011 2.074 2.200 2.262 2.388 2.450 2.576 2.639 2.766 2.827
Max. 1.267 1.331 1.394 1.457 1.520 1.646 1.708 1.835 1.898 2.025 2.088 2.215 2.277 2.404 2.466 2.593 2.656 2.783 2.845
Min. 2.954 3.016 3.142 3.393 3.518 3.770 3.895 4.147 4.272 4.524 4.649 4.900 5.026 5.277 5.403 5.654 5.780 6.031 6.065
Max. 2.973 3.035 3.162 3.414 3.540 3.793 3.918 4.172 4.297 4.550 4.676 4.928 5.055 5.307 5.434 5.686 5.813 6.157 6.192
1 1 ∕ 4 1 5 ∕ 16 1 3 ∕ 8 1 7 ∕ 16 1 1 ∕ 2 1 5 ∕ 8 1 11 ∕ 16 1 13 ∕ 16 2 1 ∕ 16 2 3 ∕ 16 2 1 ∕ 4 2 3 ∕ 8 2 7 ∕ 16 2 9 ∕ 16 2 5 ∕ 8 2 3 ∕ 4 1 7 ∕ 8 2 2 13 ∕ 16
2 15 ∕ 16
5 ∕ 32 3 ∕ 16 7 ∕ 32 9 ∕ 32 5 ∕ 16 1 ∕ 4
3
3 1 ∕ 8 3 3 ∕ 8 3 1 ∕ 2 3 3 ∕ 4 3 7 ∕ 8 4 1 ∕ 8 4 1 ∕ 4 4 1 ∕ 2 4 5 ∕ 8 4 7 ∕ 8 5 1 ∕ 4 5 3 ∕ 8 5 5 ∕ 8 5 3 ∕ 4 5
11 ∕ 32
3 ∕ 8
7 ∕ 16
1 ∕ 2
9 ∕ 16
5 ∕ 8
11 ∕ 16
3 ∕ 4
13 ∕ 16
7 ∕ 8
15 ∕ 16
1
6
6 1 ∕ 8
1 1 ∕ 16 1 1 ∕ 8
1.142 a Wrenches are marked with the “Nominal Size of Wrench,” which is equal to the basic or maximum width across flats of the corresponding nut. Minimum wrench opening is (1.005W + 0.001). Tolerance on wrench opening is (0.005W + 0.004) from minimum, where W equals nominal size of wrench. b Openings for 5 ⁄ 32 to 3 ⁄ 8 widths from old ASA B18.2-1960 and italic values are from former ANSI B18.2.2-1972. All dimensions given in inches. Table 2. Clearances for Open End Engineers Wrench (15 ° ) Nominal Wrench Size A Min. (in.) B a Max. (in.) C Min. (in.) D Min. (in.) E Min. (in.) F b Max. (in.) G Ref. (in.) H c Max. (in.) J Min. d in.-lbf 5 ∕ 32 0.156 0.220 0.250 0.390 0.160 0.250 0.200 0.030 0.094 35 3 ∕ 16 0.188 0.250 0.280 0.430 0.190 0.270 0.230 0.030 0.172 45 1 ∕ 4 0.250 0.280 0.340 0.530 0.270 0.310 0.310 0.030 0.172 67 5 ∕ 16 0.313 0.380 0.470 0.660 0.280 0.390 0.390 0.050 0.203 138 11 ∕ 32 0.344 0.420 0.500 0.750 0.340 0.450 0.450 0.050 0.203 193 3 ∕ 8 0.375 0.420 0.500 0.780 0.360 0.450 0.520 0.050 0.219 275 7 ∕ 16 0.438 0.470 0.590 0.890 0.420 0.520 0.640 0.050 0.250 413 1 ∕ 2 0.500 0.520 0.640 1.000 0.470 0.580 0.660 0.050 0.266 550 9 ∕ 16 0.563 0.590 0.770 1.130 0.520 0.660 0.700 0.050 0.297 770 5 ∕ 8 0.625 0.640 0.830 1.230 0.550 0.700 0.700 0.050 0.344 1100 11 ∕ 16 0.688 0.770 0.920 1.470 0.660 0.880 0.800 0.060 0.375 1375 3 ∕ 4 0.750 0.770 0.920 1.510 0.670 0.880 0.800 0.060 0.375 1650 13 ∕ 16 0.813 0.910 1.120 1.660 0.720 0.970 0.860 0.060 0.406 2200 7 ∕ 8 0.875 0.970 1.150 1.810 0.800 1.060 0.910 0.060 0.438 2475 15 ∕ 16 0.938 0.970 1.150 1.850 0.810 1.060 0.950 0.060 0.438 3025 1 1.000 1.050 1.230 2.000 0.880 1.160 1.060 0.060 0.500 3575 1 1 ∕ 16 1.063 1.090 1.250 2.100 0.970 1.200 1.200 0.080 0.500 3850 1 1 ∕ 8 1.125 1.140 1.370 2.210 1.000 1.270 1.230 0.080 0.500 4400 1 1 ∕ 4 1.250 1.270 1.420 2.440 1.080 1.390 1.310 0.080 0.562 5775 1 5 ∕ 16 1.313 1.390 1.690 2.630 1.170 1.520 1.340 0.080 0.562 6600 1 7 ∕ 16 1.438 1.470 1.720 2.800 1.250 1.590 1.340 0.090 0.641 8250 1 1 ∕ 2 1.500 1.470 1.720 2.840 1.270 1.590 1.450 0.090 0.641 8500 1 5 ∕ 8 1.625 1.560 1.880 3.100 1.380 1.750 1.560 0.090 0.641 9000 a B = arc radius created by the swing of the wrench. b F = inside arc radius of part. c H = thickness of wrench head. (Dimension line not shown.) d J = torque that wrench will withstand in inch-pounds. Values updated from ANSI/ASME B107.100-2010, Wrenches.
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