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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Series II 80-Pack Combo Bag, 40 of Each Size/Color | Includes Both Red (2.2 mm) and Purple (3.2 mm) Studs | The Complete Solution for Any 19" Racks with Square Punched Vertical Rails

Product ID: 206500179

Details

Color
red and purple
Exterior Finish
Grivory
Fastener Type
Lock
Material
Grivory
Thread Size
2.2 milímetros

⚡30% faster rack mounting

🔴Red studs fit rails ≤2.2mm

🟣Purple studs fit rails 2.7-3.2mm

🛠️Single-handed installation

🛡️High-strength, heat-resistant Grivory

€ 105.04

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Rackmount Revolution: Faster, Smarter, Stronger!

BUILT TO ENDURE - Crafted from automotive-grade Grivory plastic, these studs resist heat, impact, and wear for reliable, long-term performance.
ONE HANDED WONDER - Secure your gear with one hand while the other tightens nuts—simplify your workflow and reduce installation fatigue.
SPEED UP YOUR SETUP - Mount racks 30% faster by ditching cage nuts and installing from the front—no more awkward reach-arounds.
PERFECT FIT EVERY TIME - Includes 40 red (2.2mm) and 40 purple (3.2mm) studs to cover all common 19" rack rail thicknesses seamlessly.
UPGRADED SERIES II DESIGN - Enhanced nuts with PZ2 slots speed up installation and removal, making maintenance a breeze.

The Rackstuds Series II 80-Pack Combo Bag offers a comprehensive mounting solution for 19" racks with square punched vertical rails. Featuring 40 red (2.2mm) and 40 purple (3.2mm) high-strength Grivory studs, this kit enables 30% faster, single-handed installation without cage nuts. Designed for durability and compatibility, it’s ideal for data centers, pro A/V, and home labs seeking efficient, reliable rack mounting.

Specifications

ASIN	B07W1KZXFL
Best Sellers Rank	#311 in Computer Racks & Cabinets
Brand	Rackstuds
Color	red and purple
Compatible Groove Diameter	2.3 millimeters
Customer Reviews	4.6 out of 5 stars 361 Reviews
Drive Style	Square
Exterior Finish	Grivory
Fastener Type	Lock
Finish Types	Grivory
Global Trade Identification Number	09421903192172
Grade Rating	Industrial
Inside Thread Size	M 10
Item Diameter	2.2 millimeters
Manufacturer	Rack Studs Limited
Material	Grivory
Material Type	Grivory
Maximum Shear Strength	over 400 lbs
Metal Type	Grivory
Model	RSL40C-S2
Number Of Items	10
Number of Packs	2
Number of Pieces	40
Outside Diameter	2.2 millimeters
Part Number	RSL40C-S2
Screw Head Style	Flat
Set Name	40 Pack
Size Name	40 Pack
Thread Class	Coarse
Thread Size	2.2 milímetros
Thread Style	Right Hand
Thread Type	Iso Metric

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€ 105.04

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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