Torque data - Self-tapping screws

Types AB,B,BT & Y Application Test Plates for Types AB,B,BT & Y
Screw SizeMinimum Torsional LoadScrew SizePlate ThicknessHole Diameter
(No.)Nmlbf in(No.)mmin.mmin.
20.49421.220.0481.930.076
41.471341.220.0482.440.096
62.742462.030.0802.950.116
84.413982.030.0803.460.136
106.2756103.180.1254.050.159
1210.7888123.180.1254.750.188
1415.98142144.750.1875.500.217
1634.71290164.750.1876.910.272
  
Unified Threads Types D & T Application Test Plates for Types D & T
Screw SizeMinimum Torsional LoadScrew SizePlate ThicknessHole Diameter
and TPIlbf in(No.)mmin.mmin.
4.40134.402.770.1092.40.096
4.48154.482.770.1092.440.096
6.32236.323.580.1413.050.120
6.40276.403.580.1413.050.120
8.32428.323.580.1413.740.147
8.36478.363.580.1413.740.147
10.245610.244.750.1874.400.173
10.327410.324.750.1874.500.177
1/4™ .201401/4™ .206.350.2505.790.228
1/4™ .281791/4™ .286.350.2505.940.234
5/16™ .183065/16™ .187.920.3127.360.290
5/16™ .243705/16™ .247.920.3127.500.295
  

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.