Threads and Points For Type 25 Thread Cutting Screws      ANSI/ASME B18.6.4 1981
Nominal Size	Threads Per Inch	Major Dia.(D)		Minor Dia.(d)		Point Dia.(P)	Point Taper Length(S)		Minimum Practical Screw Lengths(L)
		Max	Min	Max	Min	Ref	Max	Min	90° Heads	Csk Heads
2	32	.088	.082	.064	.060	.058	.062	.047	5/32	3/16
4	24	.114	.108	.086	.082	.079	.083	.063	3/16	1/4
6	20	.139	.132	.104	.099	.095	.100	.075	1/4	9/32
8	18	.166	.159	.122	.116	.112	.111	.083	9/32	11/32
10	16	.189	.182	.141	.135	.130	.125	.094	5/16	3/8
12	14	.215	.208	.164	.157	.152	.143	.107	11/32	7/16
14	14	.246	.237	.192	.185	.179	.143	.107	3/8	1/2
5/16	12	.315	.306	.244	.236	.230	.167	.125	15/32	19/32
3/8	12	.380	.371	.309	.299	.293	.167	.125	17/32	11/16

Suggest Test Plate Thickness & Hole Sizes for Types AB, B, 25
Nominal Size	Thickness			Hole Size
	Gage	Max	Min	Drill Size	Hole Dia.
2-32	18	.0500	.0460	48	.0760
3-28	18	.0500	.0460	46	.0810
4-24	18	.0500	.0460	44	.0860
5-20	18	.0500	.0460	36	.1065
6-20	14	.0770	.0730	32	.1160
7-19	14	.0770	.0730	30	.1285
8-18	14	.1270	.1230	29	.1360
10-16	1/8	.1270	.1230	21	.1590
12-14	1/8	.1270	.1230	3/16	.1875
¼-14	3/16	.1905	.1845	5.5mm	.2165
5/16-12	3/16	.1905	.1845	I	.2720
3/8-12	3/16	.1905	.1845	21/64	.3281