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
Cancel the "cancel culture", do not participate in mob hatred.

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
Cancel the "cancel culture", do not participate in mob hatred.

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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