Thread Geometry- Self Tapping Screws - Metric

All Dimensions in mm unless otherwise stated

	d1 - Minor thread diameter d2 - Major thread diameter 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

Thread Geometry- Self Tapping Screws - Inch

All Dimensions in mm unless otherwise stated

	d1 - Minor thread diameter d2 - Major thread diameter

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

Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.