Open End Engineers Wrench 15° Installation Design Clearance Sizes Table Chart

General Engineering Reviews
Engineering Applications and Design

Open End Engineers Wrench 15° Installation Design Clearance Sizes - Wrench Clearance Chart data derived from SAE drafting manual and ANSI/ASME B18.2.2-1987 (R1999) wrench opining for nuts/bolts. This represents the recommended installation clearances for standard 15 degree open end wrenches.

Wrench installation Clearance
90 Degree Installation

120 Degree + Installation

Note: All dimensions are in inches

Wrench Size	Bolt Center Wall Clearance Minimum A	Wall Radius Maximum B	Minimum Bolt Spacing C	Bolt Center Wall Clearance Minimum D
.156	.220	.250	.390	.160
.188	.250	.280	.430	.190
.250	.280	.340	.530	.270
.312	.380	.470	.660	.280
.344	.420	.500	.750	.340
.375	.420	.500	.780	.360
.438	.470	.590	.890	.420
.500	.520	.640	1.000	.470
.562	.590	.770	1.130	.520
.594	.640	.830	1.210	.530
.625	.640	.830	1.230	.550
.688	.770	.920	1.470	.660
.750	.770	.920	1.510	.670
.781	.830	.950	1.550	.690
.812	.910	1.120	1.660	.720
.875	.970	1.150	1.810	.800
.938	.970	1.150	1.850	.810
1.000	1.050	1.230	2.000	.880
1.062	1.090	1.250	2.100	.970
1.125	1.140	1.370	2.210	1.000
1.250	1.270	1.420	2.440	1.080
1.312	1.390	1.690	2.630	1.170
1.438	1.470	1.720	2.800	1.250
1.500	1.470	1.720	2.840	1.270
1.625	1.560	1.880	3.100	1.380

Wrench Size	Bolt Center Wall Clearance Minimum E	Wall Radius Maximum F	Reference Wrench End Clearance G	Wrench Thickness or Width Maximum H
.156	.250	.200	.030	.094
.188	.270	.230	.030	.172
.250	.310	.310	.030	.172
.312	.390	.390	.050	.203
.344	.450	.450	.050	.203
.375	.450	.520	.050	.219
.438	.520	.640	.050	.250
.500	.580	.660	.050	.266
.562	.660	.700	.050	.297
.594	.700	.700	.050	.344
.625	.700	.700	.050	.344
.688	.880	.800	.060	.375
.750	.880	.800	.060	.375
.781	.890	.840	.060	.375
.812	.970	.860	.060	.406
.875	1.060	.910	.060	.438
.938	1.060	.950	.060	.438
1.000	1.160	1.060	.060	.500
1.062	1.200	1.200	.080	.500
1.125	1.270	1.230	.080	.500
1.250	1.390	1.310	.080	.562
1.312	1.520	1.340	.080	.562
1.438	1.590	1.340	.090	.641
1.500	1.590	1.450	.090	.641
1.625	1.750	1.560	.090	.641