Self Tapping Screws Thread Dimensions

Self Tapping Screw Thread Dimensions

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The tables below show the thread pitch, major and minor diameters of metric and imperial self tapping screws.

For guidance only

Metric
Imperial

Metric

Nominal Size	Pitch	Major Diameter		Minor Diameter
		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

Imperial

Screw	Threads Per Inch	Major Diameter		Minor Diameter
		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

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Self Tapping Screw Thread Dimensions

Metric

Imperial

Metric

Imperial