bolt grades and kips to foot pound conversions
bolt grades and kips to foot pound conversions
(OP)
Hi, I have two questions. First off what grades are A307, A325, and A490 bolts? Second what is the formula to convert kips to foot pounds? I appreciate your time and information. Thanks, Cory






RE: bolt grades and kips to foot pound conversions
A kip is 1000 pounds. You can't "convert" it to foot pounds. You can multiply it by the length of a lever arm to get torque.
RE: bolt grades and kips to foot pound conversions
Mass/Length
1 lb/ft = 1.488 kg/m
1 lb/yd = 0.4961 kg/m
Mass/Area
1 lb/ft2 = 4.882 kg/m2
Force
1 kip = 4.448 kN
Moment
1 kip-in = 0.113 kNm
Stress
1 kip/in2 = 6.895 MPa
Modulus
1 in3 = 16387 mm3
Second Moment of Area
1 in4 = 416231 mm4
RE: bolt grades and kips to foot pound conversions
A325 is a high strength heavy hex structural bolt with an allowable tensile stress of 44 ksi and has 3 different types (Type 1, Type 2 and Type 3).
A490 is a heat treated heavy hex structural bolt with an allowable tensile stress of 54 ksi.
RE: bolt grades and kips to foot pound conversions
here are a couple links from yahoo "torque preload" ...
http://euler9.tripod.com/fasteners/preload.html
ht
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http://www.tribology-abc.com/calculators/e3_6a.htm
good luck
RE: bolt grades and kips to foot pound conversions
Keep in mind that US customary weight units are often confused with SI mass units.
Jeff
Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com