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Often in install or specification manuals you will see something like:
Tighten X turns past finger tight
This has always bothered me as it seems ambiguous. I've always taken this to mean a "turn of the hand". Depending on flexibility, seems like this would be a little less than 180 degrees?
However, it could also easily be interpreted as a full rotation (360 degrees)....
I'm honestly surprised that the lawyers allow this in technical specs like the example above (why not just give torque?).
A turn is 360 degrees.
You are expected to put a mark on the thing you are turning, so you can observe its rotation.
They have no way of knowing which kind of wrench you are using, what your wrenching style is, or what amount of swing angle local clearances will afford you.
"Hand/finger tight" is the point at which all free lash/slop has been removed, further turning actually loads the fastener, and torque becomes measurable.
In a fastener in tension, how much strain a "turn" amounts to depends an awful lot on the length of the fastener subject to tension. Getting from "strain" to "torque" then involves a lot of other stuff.
In the case of the anchor in your link, it has little to do with tension. It is intentionally deforming the anchor to make it engage the hole you just drilled.
Max Bolt Torque, Tmax (ft-lbs) in the above spec, would indicate the rated torque of the bolt (not to be exceeded) and has nothing to do with installation torque (except that you should not exceed it when installing)
– NSjonas
May 8 '19 at 18:05
Finger tight will engage the wedge against the sleeve. You need 3-4 full 360 degree turns to lift the wedge 3-4 full threads and apply the intended lateral force against the sides of the drilled hole.
Many plumbing fittings with rubber gaskets or cone washers will say something like "1/4 turn past finger tight". It means the same thing.
What is the torque of "hand-tight"?– NSjonas May 8 '19 at 17:44Max Bolt Torque, Tmax (ft-lbs)... however, it's MAX, so I'm not sure if that's the ideal installation torque or the point of failure – NSjonas May 8 '19 at 17:56