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Thread: Friendly reminder...nearly all torque values are in foot pounds...

  1. #31
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    Can we please stop with the 1st grader shit now?



    Owner/Instructor at Semper Paratus Arms

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  2. #32
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    Quote Originally Posted by trinydex View Post
    .....Funny that in your world someone has to choose between dignity and being correct.
    I understood him to mean when someone tries to start a petty argument they intend to win on technicalities he sends them away with their tail between their legs.

  3. #33
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    So from an engineering standpoint, what is the demarcation line for when you switch from inch-lbs to ft-lbs? Iis it a function of fastener diameter, and all small screws are always specced in in-lbs, while larger nuts are specced in ft-lbs?

    When I think in-lbs I think fastening split rings on optics, floorplates on BA rifles, etc. But then when we talk installing barrels and receiver extensions, we should always think ft-lbs because of their larger diameters? Or is it a screw threading size issue -- fine threads get in-lbs and coarser threads get ft-lbs?

  4. #34
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    Quote Originally Posted by Dionysusigma View Post
    The castle nut won't. The receiver extension will, though. Now I have to break staking on my brand new A5 because of my "eyeballing."
    Not a big deal. I had to do the same. Those A5s will tighten down off center.

    Drove me nuts... I had to break and restake. Not a big deal at all.
    "You people have too much time on your hands." - scottryan

  5. #35
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    Quote Originally Posted by Iraqgunz View Post
    People actually use a torque wrench for their castle nuts? I always used my common sense and MK 1 MOD 0 arm.
    Same here. It's truly a common sense install.
    "You people have too much time on your hands." - scottryan

  6. #36
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    The military tool has a 1/2 hole for use with a torque wrench... That by it's self should immediately clue you in that the spec is in ft/lbs not in/lbs. I modified my MI industries castle nut tool for use with a torque wrench. Because I couldn't make the hole as close to the head of the tool as I wanted, I used a crow's foot torque calculator to find the right distance to get within the 38-42 ft/lbs spec, and use a whole number. I use the torque wrench set at 35 ft/lbs, and I marked the tool so that I don't forget...


  7. #37
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    olekennyroy great idea. I had always wondered about doing something like that. If you don't mind me asking what did you cut the hole with?
    Last edited by yellow50; 12-13-11 at 09:21.

  8. #38
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    I used a sharpie to draw the square. I drilled 5 1/8" holes, 1 in each corner, and 1 in the center. Then I used a 3/8" to open up the center. I followed up with a triangular file to form the sides. I threw the wrench in the oven while cooking shake and bake chicken, 400* for 45 minutes, to harden it up a little.

  9. #39
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    Quote Originally Posted by a0cake View Post
    Saw a dude's castle nut back off on Sunday at the range. He said he built the rifle himself and was sure he did everything right. (He didn't stake the castle nut first of all). But the main problem was that he kept saying that he tightened it to 40 inch pounds. A small dose of logic would have indicated that the spec is 40 FOOT POUNDS on the castle nut. Unfortunately, Armalite's manual apparently has a typo and says INCH POUNDS also. I told him it was a typo and to tighten it to 38-40 foot pounds. Nope. He takes it to the gunsmith, who agrees with Armalite. He then re-torqued (if you can call 40 inch pounds torque) the castle nut to 40 inch pounds and smothered it in blue loctite. I immediately stopped caring and went back to shooting.

    Foot pounds!

    Who uses Armalites armorers manual when building a gun???



    C4

  10. #40
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    Quote Originally Posted by Surf View Post
    The 1991 version had the incorrect torque spec information. Unfortunately so many years went by until it was corrected in the 2008 manual that the amount of misinformation passed on has created many issues. I truly believe that is why so many people actually started using loctite on the receiver extensions and castle nuts. When in reality if they had used the correct torque specs and a simple stake job then there would be no issues. Heck even Brownells build video claimed the 40 inch pound spec.

    I was trained via Colt, who's manuals have always been correct and I was debating with people over this topic for a decade until the 2008 .mil manual hit the scene with the corrections. Hell I had even attempted to use common sense in explaining that 40 inch lbs is only 3.33 foot pounds, which is basically hand tight. I had some aerospace geek claiming that the aluminum receiver / receiver extension could NEVER possibly take the torque of the steel castle nut up to 38 ft lbs. I believe that there was even a thread or two here about the topic. In reality most people who do this often or for a living don't even use a torque wrench anyway.

    BINGO! I follow the company that WROTE the TDP (as they know how to best build it).


    C4
    Last edited by C4IGrant; 12-13-11 at 09:42.

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