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bolt grades and kips to foot pound conversions
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
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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
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.
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" ...
see

2009-09-07, 04:08 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	bolt grades and kips to foot pound conversions bolt grades and kips to foot pound conversions 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 check out our whitepaper library. check out 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 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. 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" ... see __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]