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Thread: How to tell if your carrier key is properly staked.

  1. #11
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    Quote Originally Posted by C4IGrant View Post
    You can also go above this spec IF you use better quality bolts (which I do).



    C4



    Torx bolts
    That is good reference thank you C4 /

  2. #12
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    Quote Originally Posted by Javelin View Post
    That is good reference thank you C4 /
    You are welcome.


    C4

  3. #13
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    Grant, do you sell those Torx Bolts or can you source them for us?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  4. #14
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    Quote Originally Posted by Heavy Metal View Post
    Grant, do you sell those Torx Bolts or can you source them for us?
    I do and I don't. I have about 5,000 of them just sitting here, but have not put them up on the website yet.


    C4

  5. #15
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    Woud you consider selling me a couple dozen?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  6. #16
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    Do you like the Torx bolts?

    Do you know what Torx size they are?

    I like those - as it seems useful to remove screws that were staked too much.


    Generally a torque spec is computed to preload the threads to make them lock - and any more can break the bolt.

    According to this calculator, you don't want more than 46 inch-lbs. I am not sure how that jives with the 50-58 that is now recommended. Seems like the Change-7 recommending 35-40 may have been the best thing (combined with staking).

    http://www.futek.com/boltcalc.aspx

    Screws are 8-32-2A and have 0.175 of engagement, Grade-8.
    Carrier is 8620 and in the 150,000 to 190,000 psi yield range.

    Major Bolt Diameter: 0.164 in
    Bolt Thread Pitch: 32
    Bolt Proof Strength: 120000 psi
    Recepticle Length: 0.175 in
    Recepticle Strength: 150000 psi
    Applied Tensile Load: 0 lb
    k Factor: 0.2

    Recommended Torque
    34.46 in-lb
    (2.87181 ft-lb)
    (3.894 N-m)
    Resultant Tension:1050.7 lb

    Maximum Torque
    45.95 in-lb
    (3.829 ft-lb)
    (5.192 N-m)
    Resultant Tension:1400.9 lb
    Last edited by rsilvers; 10-26-11 at 15:12.

  7. #17
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    RSilvers,

    Would there be a problem with going to Grade 12?
    My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.

  8. #18
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    Grade-12 is not a real specification.

    I think the right thing to do is to not over-torque them, and then properly stake them. And by properly stake, I mean work on the process until they can be removed with between 55 and 100 inch-lbs of torque. Less is bad, and more is bad.

  9. #19
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    Quote Originally Posted by rsilvers View Post
    Do you like the Torx bolts?
    Yes

    Do you know what Torx size they are?
    Yes



    Generally a torque spec is computed to preload the threads to make them lock - and any more can break the bolt.

    According to this calculator, you don't want more than 46 inch-lbs. I am not sure how that jives with the 50-58 that is now recommended. Seems like the Change-7 recommending 35-40 may have been the best thing (combined with staking).

    http://www.futek.com/boltcalc.aspx

    Screws are 8-32-2A and have 0.175 of engagement, Grade-8.
    Carrier is 8620 and in the 150,000 to 190,000 psi yield range.

    Major Bolt Diameter: 0.164 in
    Bolt Thread Pitch: 32
    Bolt Proof Strength: 120000 psi
    Recepticle Length: 0.175 in
    Recepticle Strength: 150000 psi
    Applied Tensile Load: 0 lb
    k Factor: 0.2

    Recommended Torque
    34.46 in-lb
    (2.87181 ft-lb)
    (3.894 N-m)
    Resultant Tension:1050.7 lb

    Maximum Torque
    45.95 in-lb
    (3.829 ft-lb)
    (5.192 N-m)
    Resultant Tension:1400.9 lb
    I can tell you that I have taken these torx bolts for well over 60 in lbs and have never snapped a head.



    C4

  10. #20
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    Quote Originally Posted by Heavy Metal View Post
    Woud you consider selling me a couple dozen?
    Sure (once I get them up on the website).



    C4

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