"Suga Moto Soy" wrote in message
...

Jimmy Suarez wrote:
can somebody tell what kind of thread is this?
http://www.signaturehardware.com/product8636

it is for an old fashined door knob spindle,the thicknes is 9/32 square
stock, and 20TPI,is there a nut or bolt made for this thing? Thanx

I don't know what the thread is, but those things are so soft it usually
doesn't even matter. They'll mush in anything.

I can't believe this Jimmy, nobody can give you an answer,I thought some
great machinists are posting here.I heve seen this type of door knobs in
many houses built from the 1900s to 1940s.

Well, mine was built in 1924, but assuming it was a long-time standard, the
thread is 18 tpi (0.072" pitch) (Starrett thread gage) and the major
diameter of the threads is around 0.375" (Starrett mike). The spindle is a
little worn from old age and use, so I'll let you guess at what nut might
fit. It looks to me like a 3/8 x 18. I don't believe that's a standard; UNC
is 3.8 x 16 and UNF is 3/8 x 24.

I'd double-check that 20 tpi; it's close, but no cigar on the spindles on my
doorknobs.

--
Ed Huntress