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Thread: Red dot screw part numbers and ordering info

  1. #21
    Member SoCalDep's Avatar
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    Quote Originally Posted by GJM View Post
    At $8/screw retail, this is several thousand dollars of screws, bought for about $40 in bulk.

    Attachment 64362
    Yea buddy!

  2. #22

    Red dot screw part numbers and ordering info

    Quote Originally Posted by Quantrill View Post
    Anybody got a source for 6-40 x 1/2” with a Torx head?

    My L&M RMR cut came with hex/ Allen head. I’d really like to change to torx
    I tried a bunch of 6-40s for Sig PRO slides, and found these to be the best overall (scroll down for the right size).

    https://www.brownells.com/gunsmith-t...prod41830.aspx

  3. #23
    Site Supporter OlongJohnson's Avatar
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    Quote Originally Posted by GJM View Post
    At $8/screw retail, this is several thousand dollars of screws, bought for about $40 in bulk.

    Attachment 64362
    Or you could say it's $40 worth of screws, which will be marked up to several thousand dollars if you buy them the wrong way.
    .
    -----------------------------------------
    Not another dime.

  4. #24
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    Quote Originally Posted by wilco423 View Post
    I tried a bunch of 6-40s for Sig PRO slides, and found these to be the best overall (scroll down for the right size).

    https://www.brownells.com/gunsmith-t...prod41830.aspx
    Thanks for the info but what I need isn’t an option. I need a machine head screw, at least I think that’s what it’s called. I can find the right screw all day with hex drive. Torx drive in 1/2” length seems to be a unicorn.

  5. #25
    Site Supporter MD7305's Avatar
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    You guys using the McMaster hardware, have you seen any trouble threading them? They are very tight on my M&P, and when I back them out there's noticable wear on the screw threads and a "ribbon" of material that I believe is from the screw itself. I've already sheared one in a slide, I'm a little wary of switching out my others. The hardware sent with my CHPWS plate does the same thing but the hardware from my Holosun and included from S&W threads easily and smoothly. Any ideas?

    It looks like it's flattening or dulling the threads
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  6. #26
    Member SoCalDep's Avatar
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    Quote Originally Posted by MD7305 View Post
    You guys using the McMaster hardware, have you seen any trouble threading them? They are very tight on my M&P, and when I back them out there's noticable wear on the screw threads and a "ribbon" of material that I believe is from the screw itself. I've already sheared one in a slide, I'm a little wary of switching out my others. The hardware sent with my CHPWS plate does the same thing but the hardware from my Holosun and included from S&W threads easily and smoothly. Any ideas?

    It looks like it's flattening or dulling the threads
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    What did you shear? A McMaster screw? Was it a hex or torx drive (or other screw)?

  7. #27
    Site Supporter MD7305's Avatar
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    Quote Originally Posted by SoCalDep View Post
    What did you shear? A McMaster screw? Was it a hex or torx drive (or other screw)?
    Yes, it was a McMaster torx drive. They thread into my slide very tightly and leave wear on the threads of the screw to the point I'm leary of attempting to fully thread them in. I have two M2.0 compacts and it's the same situation with both. They become very tight before even coming close to even seating into my Holosun/CHPWS plate. Any ideas about what's attributing to this? After breaking one I'm very nervous about doing it again. The Holosun and S&W hardware threads into the slide without issue.

  8. #28
    Member SoCalDep's Avatar
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    Quote Originally Posted by MD7305 View Post
    Yes, it was a McMaster torx drive. They thread into my slide very tightly and leave wear on the threads of the screw to the point I'm leary of attempting to fully thread them in. I have two M2.0 compacts and it's the same situation with both. They become very tight before even coming close to even seating into my Holosun/CHPWS plate. Any ideas about what's attributing to this? After breaking one I'm very nervous about doing it again. The Holosun and S&W hardware threads into the slide without issue.
    How did it break? What did the screw look like. What part was left in the slide?

    Was it during shooting or installation? Did you tighten to a specific torque spec?

    I ask because if there is a problem I want to deal with it and make things better, but details matter. Wear happens with friction between metal parts. Friction can mean intolerance or tight tolerance. Friction helps things stay in place. Poor tolerance can increase wear, but torsion force (a tight screw that has lots of friction) dissipates quickly when that force is no longer applied... so it’s important to have as much detail as possible to diagnose a problem.

  9. #29
    Site Supporter MD7305's Avatar
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    Quote Originally Posted by SoCalDep View Post
    How did it break? What did the screw look like. What part was left in the slide?

    Was it during shooting or installation? Did you tighten to a specific torque spec?

    I ask because if there is a problem I want to deal with it and make things better, but details matter. Wear happens with friction between metal parts. Friction can mean intolerance or tight tolerance. Friction helps things stay in place. Poor tolerance can increase wear, but torsion force (a tight screw that has lots of friction) dissipates quickly when that force is no longer applied... so it’s important to have as much detail as possible to diagnose a problem.
    It broke while I was installing my CHPWS plate along with the new McMaster hardware. The screw was about halfway threaded in, the screw head wasn't touching the Holosun yet. I noticed it was becoming tighter, at that point I should've stopped, but I continued tightening and it broke. I hadn't used my torque wrench at that point because the screw wasn't seated yet. That's totally my fault but I noticed that when threading the screws in my other slide there was flattening on the edge of the threads of the hardware. I was curious if that was normal or something you guys had experienced.

    The first half of screw threads remain in the slide, with about 1/8" protruding from the top of the optic cut.

    The hex hardware included with my CHPWS plate also was difficult to thread. Could the threads in my slides be out of spec? Could it be a tolerance stacking issue due to the slide apparently being finished after they were tapped/threaded? This is the case for both slides.

  10. #30
    Quote Originally Posted by MD7305 View Post
    Could the threads in my slides be out of spec? Could it be a tolerance stacking issue due to the slide apparently being finished after they were tapped/threaded? This is the case for both slides.
    Hard to give a definitive answer without running a go/nogo gauge on the threads. Occam’ s razor says it’s probably a combination of finish and thread tolerance, but without data that is just an educated guess.

    You could get thee to a gunsmith and have him gauge them, and if needed chase those threads with a tap.

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