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Participant

Join Date: Aug 2010
Posts: 1

All Thread What is Grade 12

08/11/2010 9:21 AM

I have a customer in the oil business, he has a franks 658 service rig, this peice are 3ft long and help supports the derek, and it call for grade 12 all thread never herd of it

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Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4331
Good Answers: 130
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Re: All Thread What is Grade 12

08/11/2010 2:14 PM

I suppose by Allthread you mean threaded bar? Some people call it studding or stud bolts.

It could be bolt material grade, grade 12 has minimum UTS 120 kgf/mm2. Only thing is bolts are usually graded 8.8, 10.9, 12.9 etc, to signify 80,100, 120 kgf/mm2 UTS, and stress at permant set 80, 90, 90 % of UTS. Nut grades are just 8, 10, 12 etc.

Above is for metric bolts but it could be what you're after.

Cheers...........Codey

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