Bolt grades, which ones to use??

[MX450]

Im replacing some of the bolts on my LSR 250R, should i use 12.9 grade or 10.9 or 8.8? or does it really matter. And im talking about a-arms/shocks/bumpers ect, basically all the fasteners.

[tltcracing]

assuming that higher numbers are stonger then go stronger.

[red2004 TRX450R]

http://www.sizes.com/tools/bolts_SAEtork.htm

http://www.americanfastener.com/technical/grade_markings_steel.asp

[md1985250r]

red2004......thats some good stuff right there.....specifically this statement...."It isn't always a good idea to replace a bolt with a stronger one. Some bolts are deliberately chosen so that they are weak enough to fail before the stress or strain damages some more expensive or critical part of the equipment. "

:D :D :D really good stuff!!!

[MX450]

Originally posted by red2004 TRX450R
http://www.sizes.com/tools/bolts_SAEtork.htm

http://www.americanfastener.com/technical/grade_markings_steel.asp

Those links are all info on american SAE grades...

[red2004 TRX450R]

Originally posted by MX450
Those links are all info on american SAE grades...


they are there
ISO R898
Class 10.9

ISO R898
Class 8.8

ISO R898
Class 5.8

ISO R898
Class 4.6

here you go

http://www.engineersedge.com/hex_bolt_identification.htm
http://euler9.tripod.com/bolt-database/22.html
http://www.boltdepot.com/fastener-information/Bolt-Grade-Chart-B.aspx
http://en.wikipedia.org/wiki/Bolted_joint

sorry im an American

[red2004 TRX450R]

more good reading


http://home.jtan.com/~joe/KIAT/kiat_1.htm
http://home.jtan.com/~joe/KIAT/kiat_2.htm
http://home.jtan.com/~joe/KIAT/kiat_2.htm

learn 100+ new things a realy helps you in life!! :D