Spokesmann
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Thread sizesUse this thread (get it!) for commonly asked questions relating to thread sizes for Mamod or Bowman models for example.
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avenger
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Mamod new type safety valve and whistle is ¼ X 26 TPI = ¼ BSF or ¼ Brass both imperial threads.
Mamod water level plug is 2BA again imperial thread.
Mamod Trunnion bolt 1/8 X 40 TPI = 1/8 whit again imperial thread.
Mamod older type safety valve 3/8 X 26TPI = 3/8'' Brass again imperial thread.
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steamyjim
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Wilesco boiler fittings. 6mm
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John Chapman
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This is one very useful thread, thanks for the info guys.
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SillyBilly
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Screws used to construct locos = 6BA
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steamyjim
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Threads on uprated Mamod loco safety valve.
1/4 26TPI to fit into boiler.
1/4 40TPI to fit into regulator
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John Chapman
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| SillyBilly wrote: | | Screws used to construct locos = 6BA |
Which make of locos?
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steamyjim
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Mamod 
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MTA
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| steamyjim wrote: | | Wilesco boiler fittings. 6mm |
Good thing you posted that Jim. I presume you mean M6?
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steamyjim
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| MTA wrote: | | steamyjim wrote: | | Wilesco boiler fittings. 6mm |
Good thing you posted that Jim. I presume you mean M6? |
Yup, just realised there are 2 sized fittings. A smaller one, M5 I beleive
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MTA
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| steamyjim wrote: | | MTA wrote: | | steamyjim wrote: | | Wilesco boiler fittings. 6mm |
Good thing you posted that Jim. I presume you mean M6? |
Yup, just realised there are 2 sized fittings. A smaller one, M5 I beleive |
I was going to say! I had a scrap piece of rod that had been threaded to M6 and that tightened up in the threads before getting the entire length...
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silverfoxsteam
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Info on Mamod level plugs thread sizes.
The most common is 3/16" BSF but the early SE's (pre 1963ish) have a 3/16" BSW thread (coarser).
BEWARE of mistaking 'stiffness' in the thread for scale build-up or corrosion, it ain't necessarily so!
The early N&B TE1's and SR1's also had BSW threads!
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