440pcs M3 M4 M5 Hex Socket Flat Head Screws & Nuts Kit

440-Piece M3 M4 M5 Aluminum Hex Socket Flat Head Screws & Nuts Assortment Kit

Keep your workshop, DIY bench, or toolbox stocked and ready with this comprehensive 440-piece aluminum hex socket flat head screws and nuts kit. Covering three of the most commonly used metric thread sizes — M3, M4, and M5 — in four handy lengths each, this set eliminates last-minute hardware runs and gives you the right fastener for virtually any project at your fingertips.

Crafted from lightweight yet durable aluminum, these flat-head socket screws sit flush with the surface for a clean, professional finish. The hex socket (Allen key) drive style provides excellent torque transfer and reduces the risk of cam-out, making them ideal for woodworking, electronics enclosures, DIY builds, model assembly, furniture assembly, and general mechanical work.

Made in Mainland China.

What's in the Box

Key Features

• 440-piece assortment — M3, M4 & M5 screws in 4 lengths plus matching nuts
• Aluminum construction — lightweight, corrosion-resistant, and easy to work with
• Flat / countersunk head — sits flush for a neat, professional finish
• Hex socket drive — compatible with standard Allen/hex keys for high torque and no cam-out
• CE certified — meets recognized quality and safety standards
• Wide application — woodworking, electronics, model-making, furniture, bicycles, DIY projects
• Organized storage — multiple sizes sorted for quick selection on the job

Specifications

• Brand: JARBLUE
• Material: Aluminum
• Head Style: Flat (Countersunk)
• Drive Style: Hex Socket (Allen Key)
• Sizes Included: M3, M4, M5
• Lengths: 8 mm, 12 mm, 16 mm, 20 mm
• Total Piece Count: 440 pcs
• Certification: CE

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What material are these M3 M4 M5 hex socket screws made from?

A: These flat head screws and matching nuts are made from aluminum, making them lightweight, corrosion-resistant, and well-suited for indoor DIY projects, woodworking, electronics enclosures, and general mechanical assembly.

Q: What Allen key size do I need to drive these hex socket screws?

A: The screws use a standard hex socket (Allen key) drive. For M3 you'll typically need a 2 mm hex key, for M4 a 2.5 mm hex key, and for M5 a 3 mm hex key — all common sizes found in most Allen key sets.

Q: Are matching nuts included in this screw kit?

A: Yes! The 440-piece kit includes 80 M3 nuts, 80 M4 nuts, and 60 M5 nuts so you have everything needed to complete your fastenings without sourcing additional hardware separately.

Q: Are these screws suitable for outdoor use?

A: These aluminum screws offer good corrosion resistance for light outdoor applications, but they are best suited to indoor or sheltered use. For heavy-duty or fully exposed outdoor environments, stainless steel fasteners are generally recommended.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.