Kindroufly M3 Button Head Screw Assortment, 402 Pieces

Pieces: Kindroufly M3 Button Head Screw Assortment is a 402-piece kit of black alloy-steel fasteners in five listed lengths, with nuts and washers. The assortment is intended for small repairs and projects where M3 fasteners fit, while the supplied length range starts at 30 mm.

At a glance

Five listed screw lengths from 30 mm to 50 mm, all in M3 size.
The listing describes matching hex nuts, flat washers and spring lock washers.
An internal hex drive calls for a hex wrench, which the package list says is included.
The listing describes a transparent, labeled storage case with eight compartments.

Price

$4.99Save 50%

Reference price: ~~$9.98~~

Price checked: Nov 12, 2026

View offer Ahead of Black FridayExplore the selection

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Pros and cons

Pros

A concentrated selection of five longer M3 lengths can suit repairs that need 30–50 mm fasteners.
The listed nuts and two washer types make the assortment useful for assemblies that need more than screws alone.
Labeled compartments are intended to help separate lengths and small hardware.

Cons

The listed screw lengths begin at 30 mm, so this kit does not cover shorter M3 screw needs.

Technical specifications

14 specifications

Identity
Brand	Kindroufly
Model	Kindroufly-Screw-Kit

Fastener details
Material listed	Alloy Steel
Size	M3 x 30/35/40/45/50mm
Thread size	M3-0.5
Item diameter	3 millimeters
Head style	Button
Fastener type	Cap
Finish	Black Oxide
Color	Black
Drive type	Internal Hex
Listed grade	10.9 Grade

Quantity and storage
Total pieces	402
Storage layout	8 grids

What to know before buying

Listing details to confirm

The title and feature text describe 402 pieces, but the detailed package list adds up to 404: 100 screws, 100 nuts, 101 flat washers, 101 spring lock washers, one hex wrench and one case. Confirm the selected listing's contents before buying. The source also gives a separate diameter entry of 3 millimeters, while its outside-diameter field repeats that value, so treat those listing details as unconfirmed. Small parts warning: keep away from children under 6 years.

Who is it for?

A good fit for

Repair and assembly tasks requiring M3 button head socket cap screws from 30 mm to 50 mm.
Users working on listed applications such as 3D printers, computers, instruments, lamps, cabinets or bicycle repair.

Less suited to

Projects needing screw lengths under 30 mm, other metric diameters or a different head style.

Kindroufly M3 Button Head Screw Assortment, 402 Pieces · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 50 ratings

5 stars80%80%
4 stars9%9%
3 stars5%5%
2 stars0%0%
1 star6%6%

The supplied aggregate ratings skew positive, with most ratings in the five-star category, but a smaller share are one-star and the sample is limited. Ratings alone do not identify what buyers liked or disliked, so they cannot confirm fit, finish, quantities or performance for a particular repair.

Frequently asked questions

What screw sizes are listed?

The kit lists M3 screws in lengths of 30, 35, 40, 45 and 50 mm, with M3-0.5 thread size.

What is listed in the package?

The detailed package list names 20 screws of each length, 100 M3 hex nuts, 101 flat washers, 101 spring lock washers, one hex wrench and one transparent plastic case. Those quantities total 404, despite the 402-piece title.

Does the kit include a tool?

The package list names one hex wrench. The feature text says the internal hex drive requires a hex wrench.