[TheForge] 2 tapping questions, oops 3

Mon Feb 11 18:58:24 2002

Jeff -
    I have been taught that the "s" stands for special, and the "n" for the
national series threads.  Sometimes you see UNC or UNS, with the UN standing
for Unified National series of threads.

Rick Crawford at  Rafter Lazy C
Home of Rick's Forge and Lem the Wonder Mule
email = [email protected]
home page = http://www.tbcnet.com/~rafterlazyc/


- Original Message -----
From: "Barking Crow" <[email protected]>
To: <[email protected]>
Sent: Monday, February 11, 2002 7:59 AM
Subject: [TheForge] 2 tapping questions, oops 3


> I was doing some tapping yesterday and came across a reference to
sharpening
> the tap.  Anyone know how to sharpen a tap?
>
> 2.  In my collection of taps from E-bay there is one 11/16 x 11 N S.  Now
I
> know National Coarse, NC, and National Fine, NF, and National Pipe Thread,
> NPT, and Metric, but not NS.  What does the N S stand for?
>
> 3.  One of the taps has no flutes or spaces in the cutting teeth, but the
> cutters are continuous 360 degrees.  What is it?  I have some retreading
> taps and they don't look like that.
>
> Thanks for any help.
>
> I was surprised and pleased how well some old taps from the junkyard
worked
> after I got the rust off.
>
> Jeff Valentine
>