When it comes to tightening taper-thread connections, you must exercise a degree of caution.

Not enough torque and the joint will leak.

But excessive torque can result in broken housings on pumps and valves - due to the force developed by the wedge action of the tapered adaptor.

This Parker document, provides a guide for torquing tapered-thread adaptors - based on the 'turns from finger tight' (TFFT) method:

tapered threads guide

And when it comes to taper-threads, this is about as scientific as it gets.   Craig Cook

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