I have a 2.4mm rack rail, should I use Red or Purple?

If the rail thickness is >2.2mm, you'll definitely need the purple ones.

Anything to fit SKB racks??

From what I could find online, SKB racks don't use standard rack rails. They use rails directly pre-threaded for standard rack-mount bolts. As such, RackStuds will NOT work as they require the square hole. If you wanted the RackStuds for a specific reason, one option is to purchase the demo pack. Install the normal rack bolts you already have BUT from inside the case, fit your item over the bolts, then use the screw on covers from RackStud to secure the item. Personally, if you've invested in SKB racks, stick with standard bolts. I use mine in a network cabinet (no movement). 2x 1U rack mount switches & a 1U rack mount fan are the heaviest items. Everything else is patch panels or cable tidies.

I'm just installing a fixed shelf. Does it matter what colour colour/size I order?

YES Red = mounting rail upto 2.2mm thick Purple = mounting rail between 2.7mm and 3.2mm thick In other words, you need to know the thickness of your rack mounting holes. If you order Red and you have the thicker mounting rails, they won't lock in place. If you order Purple and you have the thinner mounting rails, they may screw tight to the item but they will remain loose in the square hole.

I want to use these to hold 2x 19" audio interfaces on vertical rails that dont have square holes.the m6nuts are too big.what size of these do i need

Sorry, but Rackstuds will only work with square punch vertical rails, much the same as cage nuts. Your options are limited if the holes are round and not threaded.

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🔧 Upgrade your rack game—fast, strong, and tool-free!

HEAVY DUTY STRENGTH - Each Rackstud supports over 44 lbs, securing your critical hardware with rock-solid reliability.
TOOL FREE INSTALLATION - Say goodbye to cage nut tools and install your server racks in under 45 seconds—efficiency redefined.
TRUSTED BY IT PROS WORLDWIDE - Join the global community of IT professionals who rely on Rackstuds for seamless server management.
30 STRONGER LONGER THREADS - Enhanced design for thicker cage nuts means a firmer hold and fewer installation headaches.
STREAMLINED SERVER MAINTENANCE - Simplify your rack setup and focus on performance, not fumbling with outdated screws and nuts.

Rackstuds R20 Series II are premium, tool-free server rack screws designed for 19" square punched rails. With 30% stronger, longer threads and the ability to support over 44 lbs, they enable faster, safer installations without cage nut tools. Trusted globally by IT professionals, these red screws streamline server maintenance and enhance rack stability.

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Brand	Rackstuds
Package Dimensions	15.9 x 8.8 x 2.6 cm; 80 g
Item model number	Red
Manufacturer	Rack Studs Limited
Colour	Red
Are Batteries Included	No
Item Weight	80 g
Guaranteed software updates until	unknown

Rackstuds R20 Series II Rack Mount Screws - Server Rack Screws and Cage Nuts Replacement for Server Rack Rails 19" Square Punched Vertical Rail, Without Using Cage Nut tool - Red 2.22mm/0.086 20 Pack

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