Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
(OP)
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?
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?





RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
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.
RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
BTW, this is a question for Drafting Standards, GD&T & Tol Analysis forum: http://eng-tips.com/threadminder.cfm?pid=1103
Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
AND 10056 Style E for 1/4 & 3/8 diameters. Does anyone know where I can find this info? Thanks.
RE: Thread callout, 1/4-20UNC or 1/4-20 UNC (space)
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...