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mechanical thread callout

thread1010-321697

mechanical thread callout

mechanical thread callout

(OP)
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?

RE: mechanical thread callout

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.

RE: mechanical thread callout

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

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