This is a quick AR-15 build tip on how to account for the added length of your castle nut/armorers tool when setting your torque wrench. Simply setting your torque wrench to 40 ft/lbs will not give you 40 ft/lbs on the castle nut… it will be way over-torqued. Here is the formula you can use to calculate the proper torque wrench settings based on the length of your tools.
Formula: T1 (L1 ÷ L2) = T2
You can replace pounds and inches with metric measurements too… it is all relative.
This is what the variables stand for…
T1 [torque spec for castle nut is 40 ft/lbs]
L1 [torque wrench length in inches measured center axis to the center of the hand grip]
L2 [torque wrench length + armorers tool length in inches measured center axis-to-center axis]
T2 [adjusted torque wrench setting]
In our case …
40 (14 ÷ 22) = T2
40 x 0.64 = 25.6 ft/lbs
My adjusted torque wrench setting is 25.6 ft/lbs to deliver 40 ft/lbs on the castle nut.
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