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Installation and Torque

With respect to installation and torque, there are three important design calculations and they are as follows:

Since there are wide ranges of sealing applications, more calculations may be required. If you are using standard sealing applications, then the calculations have already been done. On the other hand, if the application is unique, then these calculations will need to be tabulated. IMPORTANT: Calculations must be as accurate as possible to avoid an end result of leakage.

UNC

Nominal Screw Size

Installation Torque (in-lbs)

(#4) 112 – 40 UNC – 2A

5

(#6) 138 – 32 UNC – 2A

9

(#8) 164 – 32 UNC – 2A

20

(#10) 190 – 32 UNF – 2A

23

(#10) 190 – 24 UNC – 2A

23

(#1/4) 250 – 20 UNC – 2A

75

(#5/16) 312 – 18 UNC – 2A

142

(#3/8) 375 – 16 UNC – 2A

263

Metric

Nominal Screw Size

Installation Torque (Nm)

M3

0.6Nm

M4

2.3Nm

M5

4.0Nm

M6

8.5Nm

M8

18Nm

M10

36Nm

M12

60Nm

*Please note that the above values are recommended average values only. Variations in local conditions and the material may require significant deviations from these recommended values.