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Thread: Grip screw torque value: creating a max specification?

  1. #21
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    Quote Originally Posted by Iraqgunz View Post
    Not sure how you came to this conclusion, but I will say that I disagree. I have never seen a fillister head screw and washer combination come loose that was properly installed and in spec.

    In addition I have looked at the bottom of the screw and could visibly see that the serrations of the lock washer visibly left a mark on the underside. It seems very odd that this combination has worked for about 50 years with no issues. In fact most of the so-called horror stories/ my Colt was crap stuff almost always involves copious amounts of stupidity along with I didn't know better.
    I came to this conclusion by looking at the parts in question.

    The Colt fillister head screw does not overlap the locking teeth of their lock washer, therefore no locking is achieved. Also, the serrations you have seen under the head of the screw are caused by the washer being installed upside down. They are only supposed to go on one way and that is sharp side of the teeth towards the grip and smooth side towards the underside of the screw head.

    This isn't a bash on Colt, this is true of most manufacturers combinations of pistol grip screws and washers.
    Last edited by 556Cliff; 09-24-13 at 16:56.

  2. #22
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    I love the minutia of this site.

    I've thought about the grip screw before never for more than two whole seconds. Then again, I've never had a problem with a grip screw.

  3. #23
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    Quote Originally Posted by catargadelendaest View Post
    I love the minutia of this site.

    I've thought about the grip screw before never for more than two whole seconds. Then again, I've never had a problem with a grip screw.
    Perhaps... cause someone else did give things like this a lot of thought before they released it to the market.
    Please let me know if I have offended you...
    I would like to move on to my next task.


    I provide legal consultation and training - specializing in the Law of Gravity.

  4. #24
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    Quote Originally Posted by 556Cliff View Post
    Colt's combination of screw and washer does not actually work together correctly...
    That's some funny shit right there!

  5. #25
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    Quote Originally Posted by MK18Pilot View Post
    I'm not sure I understand the value in this operation. Chasing the threads is going to remove the anodizing. Cleaning compounds or water may lead to a bit of corrosion. The first six threads on the screw do all of the work. That's about 0.215 of an inch. If screw length is an issue, wouldn't it be easier to customize the screw?
    Just "test run" your screw into the receiver hole without the grip in place and see/sense it's tightness (or lack thereof) before installation. This might mitigate some of the holding potential of the nylon patch, but will give you the assurance you are not cross-threading or running into a hole that is not threaded all the way through.
    And since the grips are all some sort of plastic which will compresses to some degree over time, recheck the screw's tightness periodically.
    I also like to use the largest thick washer I can fit inside the grip under the screw head to help spread the torque; and unless I have no other choice, I use a stainless steel Allen Head screw which is easier to install than the slotted standard screw.
    Once installed, check under the trigger to insure the screw does not protrude into the lower receiver void.
    ColdBlue sends...
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    Former (now retired) VP MilOps @ Knight's Armament Company (KAC) (1994-2012)
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  6. #26
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    Quote Originally Posted by MK18Pilot View Post
    I'm not sure I understand the value in this operation. Chasing the threads is going to remove the anodizing. Cleaning compounds or water may lead to a bit of corrosion. The first six threads on the screw do all of the work. That's about 0.215 of an inch. If screw length is an issue, wouldn't it be easier to customize the screw?
    In theory, if running a tap through the threads to make sure they are correct removes anodizing, wouldn't installing the screw without tapping remove the same amount of anodizing or prevent the screw from being installed without over-torquing? I run a tap through mine as my first step, and never have any issues installing the grip screw. Has anyone had a properly installed grip screw work its way loose, whether it was standard (screw w/star washer) or magpul (just hex screw)?

  7. #27
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    Quote Originally Posted by coldblue View Post
    Just "test run" your screw into the receiver hole without the grip in place and see/sense it's tightness (or lack thereof) before installation. This might mitigate some of the holding potential of the nylon patch, but will give you the assurance you are not cross-threading or running into a hole that is not threaded all the way through.
    Couldn't agree more. Test fitting threaded parts is always a good idea.

    Quote Originally Posted by TXBK View Post
    In theory, if running a tap through the threads to make sure they are correct removes anodizing, wouldn't installing the screw without tapping remove the same amount of anodizing or prevent the screw from being installed without over-torquing?
    No

    Quote Originally Posted by TXBK View Post
    I run a tap through mine as my first step, and never have any issues installing the grip screw.
    Pointless

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