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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Rackstuds 40C Rack Mount Solution Series II – No More Cage Nuts! The Easiest and Safest Server Rack Solution in 19" Racks with Square Punched Vertical Rails. Contains 80 Studs; 40 of Each Size/Color

Rackstuds 40C Rack Mount Solution Series II – No More Cage Nuts! The Easiest and Safest Server Rack Solution in 19" Racks with Square Punched Vertical Rails. Contains 80 Studs; 40 of Each Size/Color

Product ID: 475284958

Details

Colour
red and purple
Exterior finish
Zinc
Fastener type
Square
Material
Metal
Thread size
10

⚡30% faster rack mounting

🔧Front-install, tool-free setup

🛡️400+ lbs shear strength

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Description

🚀 Rack smarter, not harder—ditch cage nuts forever!

SPEED UP YOUR RACK SETUP - Mount your 19" gear 30% faster than cage nuts—time is money.
STRONGER SMARTER SERIES II - 30% stronger threads and improved leverage for thicker rails and lasting durability.
UNMATCHED STRENGTH SAFETY - Withstands over 400 lbs shear force without scratching or electrical risks.
EFFORTLESS FRONT INSTALLATION - Install from the front in under 30 seconds—no more fiddling behind racks.
TRUSTED BY DATA CENTERS WORLDWIDE - Over 1.5 million units sold—join the global sysadmin elite.

Rackstuds 40C Series II is a zinc-plated, tool-free rack mounting solution designed for 19" square punched rails. It replaces traditional cage nuts, enabling 30% faster installation with front access, supports over 400 lbs shear force, and is trusted by data centers globally with over 1.5 million units sold.

Specifications

ASIN	B07W1KZXFL
ASIN	B07W1KZXFL
Best Sellers Rank	#112,247 in Computers ( See Top 100 in Computers ) #404 in Computer & Server Racks
Brand	Rackstuds
Color	red and purple
Compatible Groove Diameter	2.3 Millimeters
Customer Reviews	4.6 4.6 out of 5 stars (337)
Customer reviews	4.6 4.6 out of 5 stars (337)
Date First Available	28 November 2019
Drive Style	Square
Exterior Finish	Zinc
Fastener Type	Square
Finish Types	Zinc
Global Trade Identification Number	09421903192172
Grade Rating	Industrial
Inside Thread Size	M10
Item Diameter	2.2 Millimeters
Item model number	RSL40C-S2
Manufacturer	Rack Studs Limited
Manufacturer	Rack Studs Limited
Material Type	Metal
Maximum Shear Strength	over 400 lbs
Metal Type	Zinc
Model	RSL40C-S2
Number of Pieces	40
Package Dimensions	19.1 x 16 x 3.81 cm; 331 g
Part Number	RSL40C-S2
Screw Head Style	Flat
Set Name	Red and Purple Combo
Size Name	40 Pack
Thread Class	Class 2B
Thread Coverage	Unthreaded
Thread Size	10
Thread Style	Right Hand, Metric, External
Thread Type	Unified National Coarse (UNC)
Unit Count	80 Count

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