What kind of plastic are these? pla, abs, or pteg?

PLA, ABS or PTEG ain't going to cut it I'm afraid. While the bags are PTEG, the Rackstuds are made of Grivory, a metal replacement plastic often found in car door handles and wiper blade arms.

Which version of rackstuds will fit the startech 4u 19" desktop open frame rack?

Sadly the holes on some of the Startech racks are too small for Rackstuds. Search Google for our post on this using Rackstuds and Startech as the keywords. You could try a sample pack that has both sizes/colors to test first if you like.

are the samples the same quality materials as the actual 100 Pack ? Or they are just guide for figuring out the sizes

Thanks for your question. The samples are production parts and fit for field use. They just contain both sizes/colors along with eight nuts; four in black and four in turquoise so you can determine which size fits your rack best. In saying that, the new Series II Maroon studs fit 70~80% of the rails in the market.

any reason why I should use the yellow lockwasher? It's hard for me to get them close together when I use those

Yes, because it's designed to hold the Rackstud in an open position so it doesn't fall through the hole. Just insert the Rackstud, place the yellow lockwasher on the correct way with the little extra bit facing the rack/Rackstud, mount your gear and then tighten the screw. It will force the little yellow bit in place. If you can't tighten it enough by hand use a screwdriver the first time to ensure proper seating of the yellow lockwasher.

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🔧 Upgrade your rack game—fast, secure, and stress-free!

PROVEN GLOBAL TRUST - Over 1.5 million units sold worldwide—data centers swear by Rackstuds.
ROCK SOLID SECURITY - Each stud supports 44 lbs, safeguarding your sensitive hardware reliably.
BOOST YOUR EFFICIENCY - Streamline server installs by 30%, freeing up time for what really matters.
UNIVERSAL COMPATIBILITY - Perfectly engineered for 19” rails, fitting thicker server racks with ease.
EFFORTLESS RACK MOUNTING - Tool-free setup in under 45 seconds—ditch the cage nuts hassle.

The 40C Series II Rackstuds are a premium replacement for traditional cage nuts and rack screws, designed specifically for 19” server rails. With 80 durable studs (40 of each size/color), they enable tool-free installation in under 45 seconds, support up to 20 kg per stud, and improve mounting speed by 30%. Trusted globally with over 1.5 million units sold, these studs offer enhanced strength and compatibility for thicker rails, making them the go-to solution for efficient, secure server rack management.

€ 102.26

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TrustScore 4.5 | 7,300+ reviews

Zainab N.

Fantastic and great service. Shipping was faster than expected.

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The delivery time was excellent, and the packaging was secure.

2 months ago

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Manufacturer	Rack Studs Limited
Part Number	RSL40C-S2
Item Weight	11.7 ounces
Package Dimensions	7.76 x 6.42 x 1.77 inches
Country of Origin	New Zealand
Item model number	RSL40C-S2
Size	40 Pack
Item Package Quantity	1
Mounting Type	Rack Mount
Batteries Included?	No
Batteries Required?	No

40C Series II - Server Rack Screws for 19" Rails, Perfect Cage Nut Replacement - 80 Studs; 40 of Each Size/Color

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