Frame bolts

[T6xc]

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

[Phil Hyde]

Hi john

BSF is the correct thread for your machine. Fit what you can afford. Good luck

[John Wakefield]

BSF may be difficult to source & expensive, so maybe UNF is the best option both high tensile & stainless and you will retain the imperial (inches) sizes

[T6xc]

Thanks I did notice that bsf was a bit hard to get cheers

[tonyed27]

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.

[PeterJGreig]

Try Nookys nuts (might be Nookies) excellent product and priced sensibly Peter.

[KevinLS]

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.

[John Wakefield]

Worth reading these specs

https://www.fastenright.com/specials/materials-and-finishes/a2-and-a4-stainless-steel

https://www.fastenright.com/specials/materials-and-finishes/high-tensile-steel

[T6xc]

Cheers everyone and John interesting spec

[John Gresty]

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

[tonyed27]

Yes I know the score here. My just about finished 24 RES has:
BSF
Whitworth
Cycle Thread
BA
UNF
Metric

I even bought a new set of AF and BSF/Whitworth combination spanners.

[KevinLS]

What, no triple-start Latvian? Lightweight.