I have just bought some 1/2 inch UNF bolts for my suspension rose joints. I don't know much about tensile strength of imperial stuff. Does anyone know what these markings mean and how do they compare to metric stuff ?

thanks

[Edited on 19/6/06 by givemethebighammer]
Rescued attachment bolt.JPG

Dont see yours on here, but here are the common bolt markings and strengths:

http://www.kjbolt.com.au/technical_info_03.html

S is equivalent to metric 8.8 which 50~55 tonnes per square inch

Cheers
David

thanks, looks like it will be up to the job.

Just bear in mind that a marking on a bolt head does not garentee the quality of the bolt. Anybody could put any marking on the bolt head.

What is a better guide of quality is the manufacturer and you can get a very good idea just by inspecting the threads and quality of manufacture.

John