Thread Geometry- Self Tapping Screws - Metric

All Dimensions in mm unless otherwise stated

Self Tapping Screw Thread Metric

d1 - Minor thread diameter

d2 - Major thread diameter

p - Pitch

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

Thread Geometry- Self Tapping Screws - Inch

All Dimensions in mm unless otherwise stated

Self Tapping Screw Thread Inch

d1 - Minor thread diameter

d2 - Major thread diameter

 

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
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.