Will these hold up in a engine bay? I need them for my emblem I am reinstalling.

I dont see why not. They are 304 stainless steel...

Does anyone have the height, and width (flat to flat part) of these?

width of flat to flat is 6mm. height is 4mm.

Will these work with m3x55mm screws?

yes it fit coz thread is metric 3mm with same pitch 0.5mm.

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100Pcs M3 x 0.5mm Lock Nuts - 304 Stainless Steel Self-Lock Nylon Inserted 3mm Nylock Nuts for RC Model, 3D Printer

100Pcs M3 x 0.5mm Lock Nuts - 304 Stainless Steel Self-Lock Nylon Inserted 3mm Nylock Nuts for RC Model, 3D Printer

Product ID: 58667263

Details

Color
Silver
Exterior Finish
Plain
Fastener Type
Lock
Material
Nylon Steel
Thread Size
M3 x 0.5

🔩100 pcs M3 x 0.5mm precision lock nuts

🧷Nylon-inserted self-locking for vibration-proof hold

🛡️304 stainless steel corrosion-resistant strength

11067CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔧 Lock it down with confidence—precision meets durability in every twist!

BULK PRECISION PACK - 100 high-grade M3 lock nuts in a sleek storage case—always ready, never lose track.
COMPACT COMPATIBLE - Designed with exact 3mm thread and 5.5mm hex size for seamless integration with standard tools.
EFFORTLESS INSTALLATION - Smooth threading and self-locking design make assembly quick and secure—save time, build smarter.
INDUSTRIAL GRADE DURABILITY - Crafted from rust-proof 304 stainless steel to withstand demanding RC and 3D printing projects.
VIBRATION RESISTANT LOCKING - Nylon insert ensures your fasteners stay tight under stress—no loosening, no worries.

This set includes 100 M3 x 0.5mm lock nuts made from premium 304 stainless steel with nylon inserts for self-locking performance. Ideal for RC models and 3D printers, these nuts resist rust and vibration, ensuring secure fastening. Packaged in a convenient storage case, they fit standard 5.5mm hex tools and offer reliable, long-lasting durability for professional-grade projects.

Specifications

ASIN	B075ZZW7VL
Best Sellers Rank	#76,797 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #144 in Locknuts
Brand	binifiMux
Color	Silver
Compatible Groove Diameter	3 Millimeters
Customer Reviews	4.8 out of 5 stars 928 Reviews
Drive Style	External Hex
Exterior Finish	Plain
Fastener Type	Lock
Finish Types	Unfinished
Grade Rating	Grade 8.8 / A2-70
Inside Thread Size	M3
Item Diameter	3 Millimeters
Manufacturer	binifiMux
Material	Nylon, Stainless Steel
Material Type	Nylon, Stainless Steel
Metal Type	Stainless Steel
Number Of Items	100
Number of Pieces	100
Outside Diameter	3 Millimeters
Part Number	XXF-117
Screw Head Style	Hex
Set Name	binifiMux M3 Lock Nut Set (100 Piece)
Size Name	M3
Thread Class	ISO
Thread Coverage	Fully Threaded
Thread Size	M3 x 0.5
Thread Style	Right Hand
Thread Type	Metric 3mm
UPC	613852252062
Unit Count	100.0 Count

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11067CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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