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August 1, 2002
Maximum Recommended Torque Values for Luxfer Aluminum Cylinder Valve Threads
The following are maximum recommended torque values for Luxfer aluminum cylinder valve threads:
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Thread Size |
Maximum Torque |
| Straight Threads |
3/4-14 NGS |
100 lbf-ft (135.58 N x m) |
| .750-16 UNF |
75 lbf-ft (81.34 N x m)* |
| .875-14 UNF |
80 lbf-ft (108.46 N x m) |
| 1.125-12 UNF |
100 lbf-ft (135.58 N x m) |
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Thread Size |
Maximum Torque |
| Tapered Threads |
1/2 NGT |
50 lbf-ft (67.79 N x m) |
| 3/4 NGT |
100 lbf-ft (135.58 N x m) |
| 1 NGT |
125 lbf-ft (169.47 N x m) |
*Note that this Luxfer torque value differs from the standard Compressed Gas Association (CGA) recommendation of 60 lbf-ft. Luxfer tests have shown that for certain Luxfer cylinders, 75 lbf-ft is the preferred torque value. However, in a case where a valve manufacturer specifies and takes full responsibility for a lower torque value, Luxfer sometimes defers to that manufacturer's specification, depending on specific application conditions.
 
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