420-Pc M3 M4 M5 Hex Socket Cap Screws & Nuts Assortment Set

$129.24 $146.08

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420-Piece M3 M4 M5 Hex Socket Cap Screw & Nut Assortment Kit

Keep your workshop fully stocked with this comprehensive 420-piece hex socket cap screw and nut assortment. Covering three essential metric sizes — M3, M4, and M5 — in multiple lengths, this kit is the go-to solution for DIY enthusiasts, hobbyists, mechanics, and professional craftspeople alike. Every fastener is crafted from Grade 12.9 carbon steel with a sleek black finish for both durability and a clean look on finished projects.

Made in Mainland China.

Why You'll Love This Kit

All-in-One Coverage: 420 pieces across M3, M4, and M5 sizes with matching nuts — everything you need in one organized set.
Grade 12.9 Carbon Steel: High-strength fasteners built to handle demanding applications without stripping or breaking.
Black Oxide Finish: Corrosion-resistant coating that looks great and adds longevity in everyday use environments.
Hex Socket Drive: Allen/hex key drive style for precise torque application and recessed installation.
Metric Standard: Compatible with metric machinery, electronics, furniture, woodworking projects, and more.
CE Certified: Meets established quality and safety standards for peace of mind.

Complete Size & Quantity Breakdown

Size	Quantity
M3 × 8mm	20 pcs
M3 × 12mm	20 pcs
M3 × 16mm	20 pcs
M3 × 20mm	20 pcs
M3 Nuts	80 pcs
M4 × 8mm	20 pcs
M4 × 12mm	20 pcs
M4 × 16mm	20 pcs
M4 × 20mm	20 pcs
M4 Nuts	80 pcs
M5 × 8mm	15 pcs
M5 × 12mm	15 pcs
M5 × 16mm	10 pcs
M5 × 20mm	10 pcs
M5 Nuts	50 pcs

Specifications

Material: Carbon Steel (Grade 12.9)
Color: Black
Drive Style: Hex Socket (Allen Key)
Standard: Metric
Total Quantity: 420 pieces
Certification: CE
Suitable For: Woodworking, DIY projects, machinery, electronics assembly, furniture, and more

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Frequently Asked Questions

Q: What sizes of hex socket cap screws are included in this 420-piece assortment set?

A: The set includes M3, M4, and M5 hex socket cap screws in lengths of 8mm, 12mm, 16mm, and 20mm, along with matching M3, M4, and M5 hex nuts — 420 pieces in total covering all the most commonly needed metric fastener sizes.

Q: What tool do I need to drive these hex socket cap screws?

A: These screws use a hex socket (Allen key / hex wrench) drive. You will need the appropriate metric Allen key or hex bit for M3, M4, and M5 sizes respectively. These are widely available in standard hex key sets.

Q: Are these screws suitable for woodworking and DIY home projects?

A: Yes! These Grade 12.9 carbon steel hex socket cap screws are ideal for woodworking, furniture assembly, electronics builds, mechanical projects, and general DIY applications that call for metric fasteners in M3, M4, or M5 sizing.

Q: Do the screws come with matching nuts?

A: Absolutely. The kit includes 80 M3 nuts, 80 M4 nuts, and 50 M5 nuts, ensuring you have fully matched screw-and-nut pairs for every size in the assortment.

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.

We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.