Bolt torque spec calculator

[Intercooler]

It may help someone:

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

 

[Intercooler]

This is from the link:


Application Case


Major Bolt Diameter: 7/16" (0.4375 in)
Bolt Thread Pitch: 14 threads/inch
Bolt Proof Strength: Steel Grade 8
(120000 psi)
Recepticle Length: 1.5 in.
Recepticle Strength: 190000 psi
Applied Tensile Load: 0 lb
K Factor: 0.20



Recommended Torque


698 in-lb
(58.2 ft-lb)
(78.9 N-m)

Resultant Tension: 7970 lb




Maximum Torque


930 in-lb
(77.5 ft-lb)
(105 N-m)

Resultant Tension: 10600 lb


Results are for typical applications and are provided for
REFERENCE ONLY





This is what ARP gave me as I always questioned the specs for long vs. short:


The torque is 63-65 ft lbs with ARP MOLY LUBE and 80 ft lbs with 30WT
OIL, this is a torque spec that would cover the diameter of the studs
and would be followed for all lengths.

Thanks

Rob Lemons
ARP

-----Original Message-----
From: jesse.adkins@att.net [mailto:jesse.adkins@att.net]
Sent: Thursday, August 08, 2002 5:30 PM
To: info@arpfasteners.com
Subject: Torque specs

Hello!


I have a set of ARP 7/16" head studs for a Buick
Grand National. What should the long and short ones be
torqued too? Shouldn't the longer studs be higher?
Thanks!





I gather it is length of thread, not length of bolt/stud.

 

[REDS HOT AIR]

dont know but i know my arp head bolts are at 110 ft/lbs right now and they didnt break..

i kept tightning till the steel shims quit leaking....works great now...headgaskets suck.

 

[Intercooler]

Originally posted by REDS HOT AIR
dont know but i know my arp head bolts are at 110 ft/lbs right now and they didnt break..

i kept tightning till the steel shims quit leaking....works great now...headgaskets suck.

Was that oil or moly lube? If moly lube you are 2X the suggested torque spec

 

[Ormand]

ARP Bolts/Studs

These come in two materials, one is rated at 170,000 psi, and the other 190,000 psi, both well above the 120,000 psi used in the calc. Althought the calc apparently used the higher yield for the block, (recepticle?) which is incorrect. The "clamping force" is independent of the length of stud or bolt; however, the longer bolts will wrap a little more from torquing, and when they "unwind" after a few runs, they will lose a little more tension than the short ones. This is not true for studs, they don't twist as much while being tightened.

 

[Intercooler]

Makes sense to me. Wonder what the ARP rep was thinking?

 

[REDS HOT AIR]

Originally posted by Intercooler
Was that oil or moly lube? If moly lube you are 2X the suggested torque spec

motor oil..

oh well right its my motor and i as determined to keep the head gaskets from leaking...working so far