Torque data - Self-tapping screws

Metric

 
Types AB,B,BT & Y   Application Test Plates for Types AB,B,BT & Y
Screw Size Minimum Torsional Load Screw Size Plate Thickness Hole Diameter
mm No. Nm lbf in mm No. mm in. mm in.
2.2 2 0.49 4 2.2 2 1.22 0.048 1.93 0.076
2.9 4 1.47 13 2.9 4 1.22 0.048 2.44 0.096
3.5 6 2.74 24 3.5 6 2.03 0.08 2.95 0.116
4.2 8 4.41 39 4.2 8 2.03 0.08 3.46 0.136
4.8 10 6.27 56 4.8 10 3.18 0.125 4.05 0.159
5.5 12 10.78 88 5.5 12 3.18 0.125 4.75 0.188
6.3 14 15.98 142 6.3 14 4.75 0.187 5.5 0.217
7 16 34.71 290 7 16 4.75 0.187 6.91 0.272
 

Inch

 
Unified Threads Types D & T   Application Test Plates for Types D & T
Screw Size Minimum Torsional Load Screw Size Plate Thickness Hole Diameter
No. Threads per Inch lbf in No. Threads per Inch mm in. mm in.
4 40 13 4 40 2.77 0.109 2.4 0.096
4 48 15 4 48 2.77 0.109 2.44 0.096
6 32 23 6 32 3.58 0.141 3.05 0.12
6 40 27 6 40 3.58 0.141 3.05 0.12
8 32 42 8 32 3.58 0.141 3.74 0.147
8 36 47 8 36 3.58 0.141 3.74 0.147
10 24 56 10 24 4.75 0.187 4.4 0.173
10 32 74 10 32 4.75 0.187 4.5 0.177
1/4" 20 140 1/4" 20 6.35 0.25 5.79 0.228
1/4" 28 179 1/4" 28 6.35 0.25 5.94 0.234
5/16" 18 306 5/16" 18 7.92 0.312 7.36 0.29
5/16" 24 370 5/16" 24 7.92 0.312 7.5 0.295


The minimum torsional loads shown for unified sizes are based on BS 1580, an imperial units standard

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.