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Home > Forums > Eng-Tips Groups > Eng-Tips Groups > Engineering Language/Grammar Skills Forum

mechanical thread callout

Read More Threads Like This One

gary5832 (Aerospace)

9 May 12 15:27

Help -- there is much discussion here on how to properly call out a thread on a drawing. Specifically -- is there a space between the thread pitch and its type.
.250-20 UNC-3B or .250-20UNC-2B?

KENAT (Mechanical)

9 May 12 15:40

For a definitive answer I'd look at ASME B1.1 & ASME Y14.6.

Quick look at 14.6 fig 17 shows the space.

Metric may be different.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

dgallup (Automotive)

14 May 12 17:38

Machinery's Handbook also shows the space.

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

JohnRBaker (Mechanical)

14 May 12 18:28

It appears that with Metric threads, the standard delimiter used is a dash (-) between the 'Thread Size', the 'Tolerance Class' and any other special designations, such as:

M6 X 1 - 5H6H - LH

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
http://www.siemens.com/plm
UG/NX Museum: http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.

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