SIZE 规格	THREAD SEE NOTE	A	B	C ACROSS CORNERS	D WRENCH PAD
		HEIGHT SEE NOTE	ACROSS FLATS
1/4	1/4-20	0.281	0.502-0.492	0.552	0.194
5/16	5/16-18	0.313	0.564-0.553	0.622	0.212
3/8	3/8-16	0.406	0.690-0.679	0.766	0.251
7/16	7/16-14	0.438	0.752-0.741	0.837	0.316
	7/16-20
1/2	1/2-13	0.531	0.877-0.865	0.978	0.360
	1/2-20
9/16	9/16-12	0.563	0.950-0.928	1.051	0.421
5/8	5/8-11	0.609	1.064-1.052	1.191	0.428
	5/8-18
3/4	3/4-10	0.703	1.252-1.239	1.403	0.488
	3/4-16
7/8	7/8-9	0.781	1.440-1.427	1.615	0.535
	7/8-14
1	1-8	0.891	1.627-1.614	1.826	0.600
	1-14
1-1/8	1-1/8-7	0.969	1.814-1.801	2.038	0.627
	1-1/8-12
1-1/4	1-1/4-7	1.109	2.008-1.973	2.232	0.720
	1-1/4-12
1-3/8	1-3/8-6	1.188	2.197-2.159	2.444	0.767
	1-3/8-12
1-1/2	1-1/2-6	1.313	2.384-2.344	2.622	0.810
	1-1/2-12
1-3/4	1-3/4-5	1.469	2.762-2.715	3.075	0.986
	1-3/4-12
2	2-4-1/2	1.672	3.137-3.086	3.497	1.016
	2-12
2-1/4	2-1/4-4-1/2	1.938	3.514-3.457	3.918	1.179
	2-1/4-12
2-1/2	2-1/2-4	2.187	4.015-3.875	4.393	1.523
	2-1/2-12
2-3/4	2-3/4-4	2.187	4.015-3.875	4.393	1.523
	2-3/4-12
3	3-4	2.725	4.640-4.500	5.102	2.075
	3-12