ansi 9standards0 code issues - thread callout, 14-20unc
 

ansi thread callout, 1/4-20unc
hello,
had been taught years ago not to put a space between the thread size, and class: 1/4-20unc, but have lately been having some drawings criticized for not putting the space: 1/4-20 unc. which is the ansi standard, and are both acceptable?
asme y14.6-2001, page 8, shows the thread callout with the space.
"wildfires are dangerous, hard to control, and economically catastrophic."
ben loosli
looking at examples in asme b1.1 unified inch screw threads i see examples on the same page that differ such as the following:
2.0625-12-uns-2a
0.5000-13unc-se2b
0.3750-24unf-se2a
just before section 6.2 a legend includes the hyphen such as between unc-2a. this appears to be the preference in b1.1.
interesting - i've typically used "1/4-20unc". however, in scanning asme y15.100, the book depicts "1/4-20 unc"
with space.
btw, this is a question for drafting standards, gd&t & tol analysis forum:
i am trying to locate specs for threaded fitting ends as called out for a restrictor fitting in accordance with
and 10056 style e for 1/4 & 3/8 diameters. does anyone know where i can find this info? thanks.
jdaddy, start a new thread with that question, it's not particularly related to this one.
as regards the op asme y14.6-2001 "screw thread represenation" shows the space as looselib points out. as well as page 8 all the other examples appear fairly consistent in showing the space.
section 6.1 of b1.1 - basic method of deignating has the space. however, as jlseagull points out there are examples that don't follow this, i see several in section 5 with a "-". that said most examples appear to have the space.
there are other minor inconsistencies i'm aware of between these 2 specs, not asmes finest work.
i'd go with the space.
kenat, probably the least qualified checker you'll ever meet...