john12ax7

19" rack mounting holes specifications
« on: December 01, 2020, 10:52:25 PM »
There does not seem to be a standard for the size and location of rack mountings holes  Or rather there is a standard,  that most audio companies don't seem to follow.  The spec I've found calls for 0.268 x  0.406" inch obround holes spaced 18.312" apart.  But the gear and racks I have measured are all over the place.

So as a practical matter, what are good dimensions to use for audio rack gear?  The. 268 x. 406 hole seems rather unnecessarily oversized given #10 screws.


squarewave

Re: 19" rack mounting holes specifications
« Reply #1 on: December 02, 2020, 12:50:31 AM »
Donno but I made two racks once and the rails I bought were either very poorly tapped or the thread wasn't what I thought. I re-tapped them but now a few holes stripped out from over-tightening.

abbey road d enfer

Re: 19" rack mounting holes specifications
« Reply #2 on: December 02, 2020, 01:00:50 AM »
There does not seem to be a standard for the size and location of rack mountings holes  Or rather there is a standard,  that most audio companies don't seem to follow.  The spec I've found calls for 0.268 x  0.406" inch obround holes spaced 18.312" apart.  But the gear and racks I have measured are all over the place.

So as a practical matter, what are good dimensions to use for audio rack gear?  The. 268 x. 406 hole seems rather unnecessarily oversized given #10 screws.
I used 0.236x0.354 holes spaced 18.29". Nobody ever complained.
Who's right or wrong is irrelevant. What matters is what's right or wrong.
Star ground is for electricians.

john12ax7

Re: 19" rack mounting holes specifications
« Reply #3 on: December 02, 2020, 02:18:27 AM »
I used 0.236x0.354 holes spaced 18.29". Nobody ever complained.

Good info,  thank you.

JohnRoberts

Re: 19" rack mounting holes specifications
« Reply #4 on: December 02, 2020, 09:05:46 AM »
There does not seem to be a standard for the size and location of rack mountings holes  Or rather there is a standard,  that most audio companies don't seem to follow.  The spec I've found calls for 0.268 x  0.406" inch obround holes spaced 18.312" apart.  But the gear and racks I have measured are all over the place.

So as a practical matter, what are good dimensions to use for audio rack gear?  The. 268 x. 406 hole seems rather unnecessarily oversized given #10 screws.
Are you making a face plate, or rack?

Most face plates use slots to accommodate imprecise location.

JR
It's nice to be nice....

ruffrecords

Re: 19" rack mounting holes specifications
« Reply #5 on: December 04, 2020, 06:31:49 PM »
There is a specification for it. Not surprisingly it is many years old. I have a copy on order. When I get it I wi;; post the part that covers these holes.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

JohnRoberts

Re: 19" rack mounting holes specifications
« Reply #6 on: December 05, 2020, 11:03:20 AM »
I just looked at an old piece of Western Electric 19" rack gear from the 1930s, it used slots.

JR
It's nice to be nice....

john12ax7

Re: 19" rack mounting holes specifications
« Reply #7 on: December 05, 2020, 05:47:12 PM »
I ended up going with. 250" x .375" with 18.3" spacing.  Panels are at fabrication at the moment.


 

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