Patches
Veteran Member
Looked on British Tools and Fasteners web site, thought it might be Whitworth or some other odd ball; they list their NPT 1/4"-18 tpi tap as being just that (1/4" diameter x 18 tpi). Catalog #5915 ???
1/4-18 thread machine screw?
- Thread starter cockeyedMFer
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LD1
Epic Contributor
NPT 1/4" usually isnt even close to the same as bolt sizes. Did they happen to mention what drill size to use with that tap??
Soundguy
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i agree.. you are getting near 3/8 with that npt pipe stuff..
Midniteoyl
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Still say its a #14
LD1
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Midniteoyl
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True, but a Type B has finer threads than standard..
In any case, its a self forming thread and would work..
LD1
Epic Contributor
Even all of the type B's I seen were 14 TPI
bd53bz2
Member
Would these windows be made in England? In the 50's there were a lot of british whitworth sizes out there. I had a couple of BSA's and a 1956 English Ford car. Matching was a pain......
Zebrafive
Super Member
It's almost as if someone set up a screw machine wrong. Had 1/4" stock and 18 thread per inch cutters just adjusted them until they made threads?????
I've been watching this to see if the mystery is solved.
I've been watching this to see if the mystery is solved.