bolt grades and kips to foot pound conversions 6

[433]

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

 

[IFRs]

Check out

http://www.fastenal.com/content/documents/FastenalTechnicalReferenceGuide.pdf

for info on bolt grades. There is a table that has most of what you are looking for, I think.

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.

 

[dbuzz]

Working with US units can be quite confusing if you haven't been brough up with them, which includes just about everyone outside the US and Liberia! Here are a few key conversion factors.

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

 

[Bagman2524]

A307 is basic carbon steel with an allowable tensile stress of 20 ksi.
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.

 

[rb1957]

i think the question was (badly phrased) how to convert torque (ft.lbs) into preload (kips) ...

here are a couple links from yahoo "torque preload" ...

http://euler9.tripod.com/fasteners/preload.html

http://www.arp-bolts.com/pages/tech/images/fasttorq.pdf#search='torque preload'

http://www.boltscience.com/pages/torqueds.pdf#search='torque preload'

http://www.tribology-abc.com/calculators/e3_6a.htm

good luck

 

[jdonville]

See

http://www.onlineconversion.com

to convert any unit to any other unit.

Keep in mind that US customary weight units are often confused with SI mass units.

Jeff


Jeffrey T. Donville, PE
TTL Associates, Inc.

http://www.ttlassoc.com