3/16-24 tap & dies

[matthew]

Just found a 3/16-24 tap, and I don't recall seeing any such a thing before. #10-24 appears to be only .0025 different in diameter, but that would seem like enough to mess up a thread fit. So why does 3/16-24 exist, and is it a useful size tap to have, or just a historical oddity???

 

[Ford12508]

Only time I have ever seen a 3/16-24 was on a toggle bolt. 10-24's work just fine though every time I needed a different length 3/16 toggle.

 

[Outlawmws]

Just found a 3/16-24 tap, and I don't recall seeing any such a thing before. #10-24 appears to be only .0025 different in diameter, but that would seem like enough to mess up a thread fit. So why does 3/16-24 exist, and is it a useful size tap to have, or just a historical oddity???

Basically this. I think the 3/16 was around before # screws became the standard, and were common for "stove bolts" where 1/4 was overkill. Oddly Pic-a-Nut had (Has?) 4 sizes of 3/16 (1/2, 1, 1-1/2, 2), so possibly used automotively in the early years as well.

 

[wreckercologist]

3/16-24 is from the good old days. Simply a size that is no longer standard in todays world.

Much the same as 21/32" wrenches and sockets and the like. No longer used.

 

[slipjointed]

3/16-24 is essentially 10-24. I had an old timer explain it to me once, but I forgot the exact details.