Paddy_SP Posted March 4, 2008 Share Posted March 4, 2008 I'm building a 110 from the ground-up - as I can't bear to see my toys rot away, I've gone rather overboard with rust prevention, etc. For a start, I'm using a new galvanised chassis and stainless fasteners wherever possible. Since I've laid out a lot of cash on stainless brake caliper pistons, I'd like to replace the bolts which hold the two sides of the calipers together, as the originals are now in a nasty state. I'm reasonably well up on my bolts, but the only markings on the heads are 'ATLAS V' - can anyone here tell me what this refers to? The axle flange bolts have 'ATLAS 12.9' written on them, which tells me they're grade 12.9s, so I was wondering if the 'V' simply means they're grade 5? As ever, any help would be much appreciated! Quote Link to comment Share on other sites More sharing options...
q-rover Posted March 4, 2008 Share Posted March 4, 2008 Electrolytic corrosion. Stainless isn't neccesarilly best when mixed with other metals. Why not use galvanised bolts and nuts? Quote Link to comment Share on other sites More sharing options...
Paddy_SP Posted March 4, 2008 Author Share Posted March 4, 2008 Electrolytic corrosion.Stainless isn't neccesarilly best when mixed with other metals. Why not use galvanised bolts and nuts? Many thanks for your comment, but I've never had a problem with electrolytic corrosion in all the years I've been using stainless bolts. Quote Link to comment Share on other sites More sharing options...
rtbarton Posted March 4, 2008 Share Posted March 4, 2008 Metric bolts have a spec of the form 8.8 12.9 &c stamped on them, imperial have letters. From memory, R is stamped on BSF HT, T on UNF equivalent to 8.8 and higher letters, indicate stronger & stronger. V is very strong, the sort you'd use for flywheels &c. Treat unstamped stainless bolts as weaker than 8.8 Quote Link to comment Share on other sites More sharing options...
Paddy_SP Posted March 4, 2008 Author Share Posted March 4, 2008 Metric bolts have a spec of the form 8.8 12.9 &c stamped on them, imperial have letters. From memory, R is stamped on BSF HT, T on UNF equivalent to 8.8 and higher letters, indicate stronger & stronger. V is very strong, the sort you'd use for flywheels &c.Treat unstamped stainless bolts as weaker than 8.8 Many thanks for the info! I have some candidate bolts being sent to me - they're described as 'forged items', so I will have to wait and see what grade they are when they arrive. Any doubts, and I'll not use them. Quote Link to comment Share on other sites More sharing options...
rtbarton Posted March 4, 2008 Share Posted March 4, 2008 ...- they're described as 'forged items', ....... I'd use genuine Quote Link to comment Share on other sites More sharing options...
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