Bolts - BS 916 vs grade 50b ??? Help!
mcerd1 - 15/2/13 at 08:38 AM
Got a wee issue with job here
the customer has specified 3/4" bolts with a grade 50b (aka: S355JR)
imperial bolts would normally be to BS 916, but as far as I know it only offers 26 or 28 ton/sq.in grades [~401 or 432N/mm˛] with 20% or 17%
elongation (that puts them somewhere between a grade 4.6 and 4.8, yeilds 240 and 320N/mm˛)
the supplier has come back and offered grade S355JR or 8.8 claiming thay are the same (yields are 355 and 640 N/mm˛ respectivley) - so obviously thats
not quite right 
anyone got any clues / thoughts ?
or a long shot, has anyone still got a copy of the old imperial BS 449 ?
in days of old I know that when working with high yeild steel like S355 it was normal to use 8.8 bolts - so I'm wondering if thats whats going on
here....
cheers
-Robert
rachaeljf - 15/2/13 at 09:15 AM
Highly unusual to specify bolts like that. Is there a particular need for such soft bolts? What is the connection detail? What is the site
location?
Cheers R
designer - 15/2/13 at 09:17 AM
Your customer has no idea.
mcerd1 - 15/2/13 at 09:37 AM
quote:
Originally posted by designer
Your customer has no idea.
tell me about it 
but there drawings are all like that for the last 30+ years, and the ones before that didn't even specify any grade on anything at all
(if i told you what these were for it would scare you....)
matt_claydon - 15/2/13 at 01:24 PM
Tell your customer that UK Engineering began metrication in the 60s, and it's therefore about time they caught up!?
chillis - 15/2/13 at 01:38 PM
Imperial bolts are available in R,S, T, V, and X as well as sae 5 - 8.
http://www.gartoninternational.com/ Contact this supplier as they may have information that may help you find an imperial grade that matches your
requirement. I'm guessing that you want the imperial version of an 8.8?
sdh2903 - 15/2/13 at 04:12 PM
quote:
Originally posted by matt_claydon
Tell your customer that UK Engineering began metrication in the 60s, and it's therefore about time they caught up!?
Try telling that to the aerospace industry