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 R100 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/0.086 100 Pack

Product ID: 174132281

Details

Brand
Rackstuds
Colour
Red
Compatible devices
Server
Material
Grivory
Size
100 Pack

⏱️30% faster install

🖐️single-handed mounting

🛡️high-strength thermoplastic

C$8224

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Description

🚀 Rackmount Reinvented: Faster, Stronger, Smarter.

BUILT TO ENDURE - Engineered thermoplastic construction withstands heat, load, and daily wear like a pro.
GOODBYE CAGE NUTS - Ditch the hassle and risk of traditional cage nuts for a safer, faster, and simpler mounting solution.
ONE HANDED WONDER - Secure heavy servers solo—no extra hands or balancing acts required.
SPEED UP YOUR SETUP - Cut rack mounting time by 30% with tool-free front installation—no cage nut fumbling needed.
FITS YOUR RACK PERFECTLY - Designed for 19" rails up to 2.2mm thick—choose red for standard or purple for thicker rails.

Rackstuds R100 Series II are premium, thermoplastic rack mount screws designed to replace traditional cage nuts for 19" server racks. They enable 30% faster, tool-free, front installation with single-handed mounting capability, supporting up to 20 kg per stud. Compatible with rails up to 2.2mm thick, these 100-pack red studs combine durability and ease-of-use to streamline server and network hardware setup, trusted by IT pros worldwide.

Specifications

ASIN	B07W57W234
Best Sellers Rank	7,801 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 22 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 (1,399)
Enclosure Material	Grivory
Is Assembly Required	No
Item Weight	0.88 Pounds
Manufacturer	Rack Studs Limited
Manufacturer Part Number	RSL2.2R100-S2
Model Number	Red
Mounting Type	Rack Mount
Number of Items	1
Number of Packs	100
Product Warranty	1 year
Size	100 Pack
Unit Count	100.0 count
Weight Capacity	Minimum weight: 20 kg

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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C$8224

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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