I am helping to build a custom rack mount cabinet and need the spacing
specifications for the vertical mounting holes.  Also I need standards
for threads, hole diameters, and any general 19” rack mount
specifications.  These are to be used an a AutoCAD Design File.

Thanks,

Chris

Greetings!

It's ineresting - I've worked with 19" racks for years, and never
bothered to find out what the specifications are on them.  It turns
out that the specifications are set by the EIA (Electronic Industries
Alliance).  Amazing.  Everything has a standard these days!

The screw thread pitch does not appear to have a specification -- the
more common are 10-32 x 1/2" screws, 12-24x1/2" screws, or square
holes.

This PDF file from SSIForum.org lists the more common EIA dimensions
with drawings:
http://www.ssiforum.org/docs/server_rack_spec_v1_1.pdf

There are two hole patterns covered, the universal (as shown in the
PDF above) with spacing at 5/8" (16mm), 5/8 (16mm), 1/2" (13mm)
centers, and the wide, with spacing at 11/4 (32mm), 1/2" (13mm)
centers.

For the full specification, you will have to order the 310 standard
from the IHS link below that West-ga has provided.  You can also get
the standard electronically by subscribing to the IHS electronic
library at:
http://www.ihs.com/standards/index.html

I hope this answers your question; if you need further information,
please ask for a clarification before rating the question.


Search Strategy:
eia 310 hole distance
://www.google.com/search?q=eia+310+hole+distance&hl=en&lr=&ie=UTF-8&oe=utf-8&start=10&sa=N

eia 310 hole spacing
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=utf-8&q=eia+310+hole+spacing


Further Reading:

B-Line Relay Racks:
http://www.groupiv.com/bline/relay/

Excellent answer.  You covered everything I needed.  Again I'd like to
thank west for showing me to the full specs, and thank google for such
a great service.  The first answer I received was terrible, but google
reposted it and I am very happy with the results.

Hello Chris,

You should find all the information that you need in the following document:

EAI-310: RACKS, PANELS AND ASSOCIATED EQUIPMENT

It is available from 'Global Engineering Documents' for the price of $48 USD.
Please order on-line using the following link:

http://global.ihs.com

I hope this gives you what you need.

Regards

Hello again Chris,

Since I can't edit my first comment I'll have to post a correction as
another comment.
The correct document details are as follows:

EIA-310: RACKS, PANELS AND ASSOCIATED EQUIPMENT

Sorry for typo.

Regards