Fgruh M3 Screw Assortment Kit 2300PCS — Black Zinc Cap & Button Head Bolts, Nuts & Washers, 9 Lengths, Organized Case

Fgruh 2300PCS M3 Screw Assortment Kit supplies a complete, organized selection of M3 hex-socket cap and button head screws plus matching nuts and washers for precision DIY, 3D printer builds, RC models and general hardware tasks.

Whether you're assembling a 3D printer, repairing an RC car, or tidying a maker bench, this set delivers variety, strength, and quick access. The kit contains cap and button head M3 bolts in nine lengths, abundant nuts, flat washers and spring washers, all made from high-strength alloy steel with a black zinc finish. A clear, compartmentalized storage box keeps components separated and labeled so you can find the right fastener at a glance.

What sizes and quantities are included in this M3 hardware kit?

The set covers nine lengths of M3 screws plus matching hardware for each size so you can tackle small assemblies and thicker joins. It contains 286 cap-head and 286 button-head screws across lengths, and ample nuts and washers to pair with each screw.

• M3 x 4/6/8/12/16/20/25/30/35 mm bolts (cap and button heads included)
• 576 M3 hex nuts for secure fastening
• 576 flat washers to protect surfaces and distribute load
• 576 spring washers to reduce loosening from vibration

How tough are these screws and where can I use them?

Forged from high-strength alloy steel in 10.9 and 12.9 grades with a black zinc coating, these fasteners offer elevated tensile strength and corrosion resistance compared with plain steel. They are suited to indoor projects and light outdoor use where strength and reliability matter.

• 10.9 & 12.9 grade alloy steel construction for higher load capacity
• Black zinc plating adds mild corrosion resistance and a low-reflective finish
• Useful for 3D printers, CNC fixtures, electronics, bikes, RC vehicles and furniture repair
• Spring washers help preserve tension in vibrating assemblies

How does the storage case help manage fasteners during projects?

The compartmentalized storage box groups bolts, nuts and washers by size and type so you save time hunting for parts. Clear lids and printed labels speed selection while preventing mixing during transport or storage.

• Individual compartments for each length and component type
• Transparent cover for fast visual checks of inventory
• Compact, stackable design that fits a workshop drawer or shelf
• Labels reduce assembly errors and improve workflow efficiency

Which head style should I choose: hex socket cap or button head?

Use hex socket cap screws when a flush side profile and higher clamping force are required; button heads work best where a lower profile and smoother top surface are preferred. Both head types accept an Allen key for controlled torque.

• Hex socket cap: taller head, stronger clamping, ideal for structural joins
• Hex socket button: lower profile, reduced snagging, ideal for visible assemblies
• Both accept hex keys for precise tightening and repeatable torque
• Mix of both styles gives flexibility for prototype and finished projects

Who is this for: Makers, hobbyists and technicians who regularly build, repair or prototype with fine hardware will appreciate this kit. It’s tailored for 3D printer builders, RC enthusiasts, electronics hobbyists, CNC operators and anyone who needs a ready supply of reliable M3 fasteners in varied lengths. The assortment and storage solution remove the guesswork from small-scale fastening jobs so you can focus on the build.