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Calling All MadModder Thread Experts! Help Needed!

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Symon:
So, if you're viewing...your're and expect. Thank god...cause I need ya helps!

I need to identify this fine thread that's on a brass elbow that I need to find another of. Most of the oil pipes on my 1950s machine use this fine thread.

The male end of the elbow is 1/4" BSP (20 tpi)...I believe.  The female end is, err, well, I think, maybe, possibly...1/2" BSB (British Standard Brass) as it has about 26 tpi :scratch:

I don't have imperial thread gauges atm (busy buying other stuff and lost my old ones) so measured the BSP male, subtracted .25", counted the threads (20 tpi) and got 1/4" BSP. Already sort of knew this and confirmed with a known fitting. I was just wondering if it was BSW as they were close.

ANYWHO...the female thread had stumped everyone I asked, stumped Crosslings, and stumped Cromwells :lol:

But I came across BSB and realised it's very likely this. BSB doesn't subtract any 0.25" to get its named size and the dimensions and tpi seem to match 1/2" BSB.

So have I cracked it? And where the hell can I find an elbow that's male 1/4" BSP to female 1/2" BSB? :lol:

Maybe one of you smart guys will go "Hey, just buy x and it'll be the same fit" :coffee:, tell me I'm wrong, or point me in the directing of maybe someone who deals in old brass fittings :thumbup:

Here's a pic. I have another elbow that has both ends female mystery fine thread, but it has to go into a 1/4" BSP either way.

naffsharpe (Nathan):
I'll hazard a guess at either a Wade compression x 1/4" bsp elbow or a 1/4"bsp x Gas compression elbow. Both the same in practical terms and should be available through your local hydraulic hose specialist.
Nathan.

seadog:
I think you're correct in assuming it's BSB. It would be 1/2" BSB. Where you'll get fittings from I haven't a clue. They are not a standard item as far as I am aware.

Pete.:
That looks like the oil pipe fittings on my old J&S surface grinder except mine are smaller I think. I will go and measure them on the weekend and if they are the same you can have them.

awemawson:
Both British Standard Brass and British Standard Cycle threads have a 1/2" X 26 tpi thread in their range.

Tracy Tools carry taps and dies for both

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