Hi.can someone tell be what the thread type was used for greeves frame bolts 1960 Scottish ie bsf or unf or what ever,regards john
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On my Silverstone rebuild, where the bolt goes into a captive thread I've had to use the original BSF threads, all others I've replaced with much cheaper UNF bolts/nuts.
Spalding Fasteners (ebay) have a good selection of both.
Some fasteners are cycle thread and BA.
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I started out trying to use only the original sizes, but have found that in order to get the material/head type/size and quality I wanted I've wound up using a mixture of thread types. However I've used the following suppliers with varying success where the original thread pattern has been essential:
polished-stainless.com
stainlessmiddleton.co.uk
stainlessautomotivefastenings.co.uk
namrick.co.uk
spaldingfasteners.co.uk
There is one other manufacturer I wouldn't recommend, their products look fantastic, beautifully polished etc., until you try using them and realise that the thread sizes are off.
A lot of recently manufactured BSF fasteners are thread cut . An engineer can correct me if I'm wrong but I think the original fasteners had rolled threads and were stronger.
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I used the advice given in the Carrick and Wood book. Shanked metric Allan bolts. But then again I was not fussy about what bolts threads I used as long as they fitted and were suitable for the specific position (correct diameter, correct length, suitable standard, etc ) , a real mish mash of bolts on my machine.
John
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