That is good reference thank you C4 /
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Grant, do you sell those Torx Bolts or can you source them for us?
Woud you consider selling me a couple dozen?
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
RSilvers,
Would there be a problem with going to Grade 12?
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.
Yes
YesQuote:
Do you know what Torx size they are?
I can tell you that I have taken these torx bolts for well over 60 in lbs and have never snapped a head.Quote:
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
C4