SIZE 规格	THREAD SEE NOTE	A	B	C ACROSS CORNERS	D WRENCH PAD
		HEIGHT SEE NOTE	ACROSS FLATS
1/4	1/4-20	0.313	0.439-0.430	0.482	0.225
	1/4-28
5/16	5/16-18	0.344	0.502-0.492	0.552	0.250
	5/16-24
3/8	3/8-16	0.453	0.564-0.553	0.622	0.335
	3/8-24
7/16	7/16-14	0.453	0.627-0.615	0.698	0.324
	7/16-20
1/2	1/2-13	0.594	0.752-0.741	0.837	0.464
	1/2-20
9/16	9/16-12	0.641	0.877-0.865	0.978	0.469
	9/16-18
5/8	5/8-11	0.750	0.940-0.928	1.051	0.593
	5/8-18
3/4	3/4-10	0.875	1.064-1.052	1.191	0.742
	3/4-16
7/8	7/8-9	0.984	1.252-1.239	1.403	0.790
	7/8-14
1	1-8	1.047	1.440-1.427	1.615	0.825
	1-12
	1-20
	1-14
1-1/8	1-1/8-7	1.172	1.627-1.614	1.826	0.930
	1-1/8-12
1-1/4	1-1/4-7	1.391	1.814-1.801	2.038	1.125
	1-1/4-12
1-3/8	1-3/8-6	1.578	2.008-1.973	2.232	1.282
	1-3/8-12
1-1/2	1-1/2-6	1.609	2.197-2.159	2.416	1.313