Wrench clearance

Size 1	Diameter [in]	A Min [in]	B Min [in]	Diameter [mm]	A Min [mm]	B Min [mm]
1/8	0.125	0.179	0.219	3.18	4.55	5.56
5/32	0.156	0.187	0.244	3.96	4.75	6.20
M4	0.157	0.180	0.237	4.00	4.56	6.03
3/16	0.188	0.218	0.301	4.78	5.54	7.65
M5	0.197	0.207	0.287	5.00	5.26	7.29
M5.5	0.217	0.262	0.353	5.50	6.66	8.97
7/32	0.219	0.233	0.325	5.56	5.92	8.26
M6	0.236	0.280	0.381	6.00	7.11	9.69
1/4	0.250	0.269	0.378	6.35	6.83	9.60
M7	0.276	0.311	0.435	7.00	7.91	11.05
9/32	0.281	0.280	0.407	7.14	7.11	10.34
5/16	0.313	0.316	0.461	7.95	8.03	11.71
M8	0.315	0.325	0.472	8.00	8.26	11.98
11/32	0.344	0.336	0.499	8.74	8.53	12.67
M9	0.354	0.372	0.542	9.00	9.46	13.76
3/8	0.375	0.362	0.543	9.53	9.19	13.79
M10	0.394	0.400	0.592	10.00	10.16	15.04
M11	0.433	0.422	0.636	11.00	10.71	16.15
7/16	0.438	0.395	0.612	11.13	10.03	15.54
M12	0.472	0.451	0.688	12.00	11.46	17.47
1/2	0.500	0.442	0.694	12.70	11.23	17.63
M13	0.512	0.485	0.744	13.00	12.31	18.89
M14	0.551	0.510	0.791	14.00	12.96	20.10
9/16	0.563	0.492	0.779	14.30	12.50	19.79
M15	0.591	0.542	0.845	15.00	13.76	21.46
5/8	0.625	0.530	0.853	15.88	13.46	21.67
M16	0.630	0.561	0.887	16.00	14.26	22.53
M17	0.669	0.607	0.955	17.00	15.41	24.25
11/16	0.688	0.577	0.935	17.48	14.66	23.75
M18	0.709	0.607	0.978	18.00	15.41	24.83
M19	0.748	0.644	1.037	19.00	16.36	26.35
3/4	0.750	0.618	1.012	19.05	15.70	25.70
M20	0.787	0.678	1.093	20.00	17.21	27.77
13/16	0.813	0.702	1.132	20.65	17.83	28.75
M21	0.827	0.695	1.133	21.00	17.66	28.79
M22	0.866	0.731	1.192	22.00	18.56	30.27
7/8	0.875	0.718	1.183	22.23	18.24	30.05
M23	0.906	0.764	1.248	23.00	19.41	31.69
15/16	0.938	0.765	1.266	23.83	19.43	32.16
M24	0.945	0.780	1.285	24.00	19.81	32.65
M25	0.984	0.821	1.348	25.00	20.86	34.24
1	1.000	0.796	1.330	25.40	20.22	33.78
M26	1.024	0.506	1.055	26.00	12.86	26.79
M27	1.063	0.900	1.471	27.00	22.86	37.37
1 1/16	1.063	0.874	1.445	27.00	22.20	36.70
M28	1.102	0.922	1.515	28.00	23.41	38.49
1 1/8	1.125	0.892	1.498	28.58	22.66	38.05
M29	1.142	0.922	1.538	29.00	23.41	39.06
M30	1.181	0.965	1.604	30.00	24.51	40.73
1 3/16	1.188	0.937	1.579	30.18	23.80	40.11
M31	1.220	0.987	1.648	31.00	25.06	41.85
1 1/4	1.250	0.983	1.661	31.75	24.97	42.19
M32	1.260	1.010	1.694	32.00	25.66	43.03
M33	1.299	1.020	1.726	33.00	25.91	43.84
1 5/16	1.313	1.062	1.775	33.35	26.97	45.09
M34	1.339	1.054	1.782	34.00	26.76	45.26
1 3/8	1.375	1.087	1.836	34.93	27.61	46.63
M36	1.417	1.134	1.908	36.00	28.81	48.47
1 7/16	1.438	1.144	1.929	36.53	29.06	49.00
1 1/2	1.500	1.228	2.049	38.10	31.19	52.04
1 9/16	1.563	1.249	2.104	39.70	31.72	53.44
M41	1.614	1.268	2.153	41.00	32.21	54.68
1 5/8	1.625	1.351	2.241	41.28	34.32	56.92
1 11/16	1.688	1.425	2.351	42.88	36.20	59.72
1 3/4	1.750	1.499	2.461	44.45	38.07	62.51
M46	1.811	1.369	2.365	46.00	34.76	60.06
1 13/16	1.813	1.499	2.496	46.05	38.07	63.40
1 7/8	1.875	1.593	2.625	47.63	40.46	66.68
M50	1.969	1.526	2.611	50.00	38.76	66.33
2	2.000	1.593	2.696	50.80	40.46	68.48
2 1/16	2.063	1.687	2.825	52.40	42.85	71.76
2 1/8	2.125	1.687	2.861	53.98	42.85	72.67
2 3/16	2.188	1.687	2.896	55.58	42.85	73.56
2 1/4	2.250	1.687	2.931	57.15	42.85	74.45

Footnotes

1. Oberg, Jones, Horton, Ryffel, McCauley. (2020). Machinery’s Handbook 31 Digital Edition. https://ebooks.industrialpress.com/pdfreader/machinerys-handbook-digital-edition-31st ↩