got 2 ?'s

Discussion in 'Gunsmithing' started by Nape.270, Jan 30, 2009.

  1. Nape.270

    Nape.270 Well-Known Member

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    Q#1. I am wondering how many inlb's to torque my recoil lug hex screws to?

    Q#2. I have a post64 M70 LA and I'm wondering if there is any advantage of having a one pease floorplate?
     
  2. NesikaChad

    NesikaChad Well-Known Member

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    1. 40 inch lbs is all you need, anymore just yields the threads.

    2. A two piece if fine, one piece is just a cosmetic thing.
     

  3. Nape.270

    Nape.270 Well-Known Member

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    The reason I asked about the floorplate is because i thank i am going to make one.

    thanks for the reply.:)
     
  4. NesikaChad

    NesikaChad Well-Known Member

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    Good luck.
     
  5. Nape.270

    Nape.270 Well-Known Member

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    lol wont need it.

    thanks though.
     
  6. Kevin Cram

    Kevin Cram <b>SPONSOR</b>

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    I would really like to know the formula you have for figuring the yeild of a 1/4-28 bolt?

    I've always ran 65 in/lbs on action guard screws that are bottoming out solid on a pillar and a bedded action. If this was a plastic, wood or fiberglass stock with no pillars or beding the torque value would change as the material can be compressed. 40 in/lbs to me is too light. ​

     
  7. davewilson

    davewilson Well-Known Member

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    [QUOTE=NesikaChad; 40 inch lbs is all you need, anymore just yields the threads.

    are you using screws made out of plastic?
     
  8. NesikaChad

    NesikaChad Well-Known Member

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    No, it comes from an engineer who makes a nice 6 figure income designing fasteners.

    The two of us did the homework in 2004/05.

    I have several posts on here that explain it pretty well so dig around and you'll find em.

    It's the truth, it works, and if your rifle's bedded right its all you need.
     


  9. T=KxDxP

    K (coefficient of fricition or nut factor)
    D (nominal dimension in inches of bolt)
    P (desired tensile load in #'s usually 75% of yield strength)
     
    Last edited by a moderator: Jan 31, 2009
  10. NesikaChad

    NesikaChad Well-Known Member

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    Last edited: Jan 31, 2009