A reappearing question is what torque to apply when mounting nuts, mostly for antenna mounts, but also for the connecting nut on connectors like N and SMA. It is not unusual that connectors are tightened with far to high torque. A good suggestion is to buy a torque wrench, they are available for a few hundred SEK.
Recommended torque differs a lot depending on what the connection joint looks like. Generally it is good to use a flat washer (or washer head nut) that distributes the force over the surface. [Nuts and bolts] M4 stainless 2-4 Nm feeder for parabolic dish (M6 stainless) 10 Nm bracket, stainless for parabolic dish (M8 stainless) 20 Nm bracket, galvanised 50-120 mm for HD parabolic dish (M12 stainless) 40 Nm [Connectors] N max 1.7 Nm, typ 0.7-1.1 Nm SMA standard (stainless, gold/CuBe) max 1.7 Nm, typ 0.8-1.1 Nm SMA economy (brass) max 0.6 Nm, typ 0.5 Nm (same torque applies for RP-SMA and LH-SMA) For more information contact Johan Gunhamn. |
