1/4-18 thread machine screw?

   / 1/4-18 thread machine screw? #21  
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? #22  
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 ???

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??
 
   / 1/4-18 thread machine screw? #23  
i agree.. you are getting near 3/8 with that npt pipe stuff..
 
   / 1/4-18 thread machine screw? #24  
Still say its a #14
 
   / 1/4-18 thread machine screw? #26  
All the #14's I have been seeing are 14TPI, not 18...

Correct diameter though...

True, but a Type B has finer threads than standard.. ;)

In any case, its a self forming thread and would work..
 
   / 1/4-18 thread machine screw? #27  
Even all of the type B's I seen were 14 TPI
 
   / 1/4-18 thread machine screw? #28  
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......
 
   / 1/4-18 thread machine screw? #29  
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.
 
   / 1/4-18 thread machine screw? #30  
Strange alright. Could always buy lo grade 1/4-20 and give em a stretch
 

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