Self Tapping Screws - thread geometry

All dimensions in mm unless otherwise stated.

Metric

	d1 - Minor thread diameter male d2 - Minor thread diameter female p - Pitch

Nominal size	Pitch	Major diameter		Minor diameter
Nominal size	Pitch	max	min	max	min
2.2	0.8	2.24	2.1	1.63	1.52
2.9	1.1	2.9	2.76	2.18	2.08
3.5	1.3	3.53	3.35	2.64	2.51
3.9	1.4	3.91	3.73	2.92	2.77
4.2	1.4	4.22	4.04	3.1	2.95
4.8	1.6	4.8	4.62	3.58	3.43
5.5	1.8	5.46	5.28	4.17	3.99
6.3	1.8	6.25	6.03	4.88	4.7

Inch

	d1 - Minor thread diameter male d2 - Minor thread diameter female

Screw	Threads per inch	Major diameter		Minor diameter
Screw	Threads per inch	max	min	max	min
No. 2	32	0.088	0.083	0.064	0.06
No. 4	24	0.114	0.109	0.086	0.082
No. 6	20	0.139	0.132	0.104	0.099
No. 7	19	0.154	0.147	0.115	0.109
No. 8	18	0.166	0.159	0.122	0.116
No. 10	16	0.189	0.182	0.141	0.135
No. 12	14	0.215	0.208	0.164	0.157
No. 14	14	0.246	0.237	0.192	0.185