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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AR-15 QUICK TIP – CASTLE NUT TORQUE: Calculate Proper Torque to Avoid Stripped Buffer Tube Threads

2 thoughts on “AR-15 QUICK TIP – CASTLE NUT TORQUE: Calculate Proper Torque to Avoid Stripped Buffer Tube Threads

  • June 3, 2021 at 15:07
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    While it appears you did the torque calculation correctly, if you put your torque wrench at 90 degrees to the armorers wrench you will not need to perform a calculation.

    Reply
    • June 4, 2021 at 10:57
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      I have seen that 90 deg technique and it does make sense. Not sure if there is any variance in doing it that way, but it seems like it should work.

      Reply

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