Torque specs are a property pertaining to the size and grade of the bolt.
Knowing this, a chart can be looked up for that information.
A half inch bolt generally has a three quarter inch hex head.
The grade is the marking on the cap.
No markings and it is a standard grade, think soft, type of bolt.
Three lines is a grade five.
Five or six lines is a grade eight.
And socket head bolts, (Allen heads), are higher.
Anything else, triangles and whatnot, are manufacturers marks.
Not all impacts are created equal on distributing torque.
I suggest checking by hand afterward regardless.
A strap wrench recommended to hold the cylinder shaft.
Any marring there can lead to cut seals that end up leaking.
You can also make some sort of 'soft jaws', clamping with brass or wood between grips and shaft.
Hope this helps.
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Rusty
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