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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Rackstuds R20 Series II - Server Rack Screws 20 Pack | Cage Nut Replacement | Red 2.22mm/0.086" | A faster, easier solution for rack mounting gear in 19" racks with square punched vertical rails

Rackstuds R20 Series II - Server Rack Screws 20 Pack | Cage Nut Replacement | Red 2.22mm/0.086" | A faster, easier solution for rack mounting gear in 19" racks with square punched vertical rails

Product ID: 189035254

Details

Brand
Rackstuds
Colour
Red
Compatible devices
Server
Material
Grivory
Size
20-pack

🔥thermoplastic strength

⚙️30% faster install

🖐️single-handed mounting

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Description

🚀 Rackmount Revolution: Faster, Safer, Smarter!

BUILT TO ENDURE - Engineered thermoplastic construction withstands heavy loads and extreme temps reliably.
GOODBYE CAGE NUTS - Ditch the hassle—Rackstuds offer a safer, faster, and simpler alternative to traditional cage nuts.
ONE HAND ALL DONE - Secure your gear solo—Rackstuds support your equipment for effortless single-handed installs.
SPEED UP YOUR SETUP - Cut rack mounting time by 30% with front-install Rackstuds—no more cage nut fumbling.
FITS YOUR RACK PERFECTLY - Designed for 2.2mm rails with color-coded options for thicker rails—versatility meets precision.

Rackstuds R20 Series II are innovative red thermoplastic rack screws designed to replace cage nuts in 19" server racks. They enable 30% faster installation with single-handed mounting, support up to 200 kg, and fit rails up to 2.2mm thick. Trusted for durability and ease, they transform rack mounting into a quick, safe, and efficient process favored by IT pros.

Specifications

ASIN	B07W585S5B
Best Sellers Rank	5,913 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 9 in Computer & Server Racks
Brand Name	Rackstuds
Colour	Red
Compatible Devices	Server
Country of Origin	New Zealand
Customer Reviews	4.5 4.5 out of 5 stars (1,358)
Enclosure Material	Grivory
Is Assembly Required	No
Item Weight	0.08 Kilograms
Manufacturer	Rack Studs Limited
Manufacturer Part Number	RSL2.2R20-S2
Model Number	Red
Mounting Type	Rack Mount
Product Warranty	1 year
Size	20-pack
Weight Capacity	Minimum weight: 200 kg

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