304 Stainless Steel Metric Screw Assortment Kit — One Box, Every Size You Need
Mid-project hardware runs are frustrating. Whether you're tightening a motorcycle bracket, assembling furniture, or wiring a control panel, stopping because you're one M4 bolt short kills momentum. This metric screw assortment kit puts M3, M4, and M5 button head cap screws, flat washers, and hex nuts in a single organized box — so the right fastener is always within reach.
The kit is built from 304 stainless steel with a passivated silver finish. Screws range from 8 mm to 20 mm in length (approx. 5/16 in – 25/32 in), covering the most common metric thread sizes used in light machinery, electronics, and general repair. Each piece is sorted into a 24-compartment transparent storage case for fast identification and clean storage.
Available in three assortment sizes — 840 pcs (M3/M4/M5), 1300 pcs (M2/M3/M4/M5), and 1410 pcs (M3 only) — so you can match the kit to your workload, whether it's a weekend project or a busy workshop bench.
✅ Compatible with standard metric hex key (Allen wrench) sets — M3, M4, and M5 socket sizes. Suitable for indoor and outdoor use in humid or high-temperature environments.
Key Features
- 🔩 Button Head Hex Socket Drive — Low-profile rounded head with internal hex socket provides a clean, snag-free finish and secure torque transfer with a standard Allen key.
- 🛡️ 304 Stainless Steel with Passivated Surface — Corrosion-resistant alloy with passivation treatment for reinforced rust resistance; suitable for humid, outdoor, and high-temperature environments.
- 📐 Multiple Lengths per Thread Size — M3, M4, and M5 screws available in 8 mm, 12 mm, 16 mm, and 20 mm lengths (approx. 5/16 in – 25/32 in), covering the most common metric fastener needs in one kit.
- 🔧 Complete 3-Piece Fastener System — Each kit includes matching button head cap screws, flat washers, and hex nuts, giving you a full fastening solution without sourcing parts separately.
- 📦 24-Compartment Organized Storage Case — Transparent plastic case with labeled compartments keeps every size separated and instantly visible — no more digging through mixed bags.
- ⚙️ Three Kit Sizes to Match Your Needs — Choose 840 pcs (M3–M5), 1300 pcs (M2–M5), or 1410 pcs (M3 focus) depending on your project scale and thread size requirements.
What's in the Box
840 Pcs Kit (M3/M4/M5 — 304 Stainless Steel):
- M5×8mm ×15, M5×12mm ×15, M5×16mm ×10, M5×20mm ×10
- M4×8mm ×30, M4×12mm ×20, M4×16mm ×20, M4×20mm ×20
- M3×8mm ×40, M3×12mm ×30, M3×16mm ×30, M3×20mm ×30
- Washer M5 ×60, Washer M4 ×100, Washer M3 ×140
- Nut M5 ×60, Nut M4 ×90, Nut M3 ×130
- 1× 24-compartment transparent storage case
1300 Pcs and 1410 Pcs kits include additional M2 and/or M3 sizes — see variant options for details.
Who Is This For
🔧 DIY Enthusiasts & Home Repair
Keep a full metric fastener set on hand for furniture assembly, appliance repairs, and home improvement projects without multiple hardware store trips.
🏍️ Automotive & Motorcycle Mechanics
Ideal for bracket fastening, panel mounting, and general mechanical repairs where M3–M5 metric bolts are standard.
⚙️ Industrial Machinery & Precision Electronics
Button head profile and stainless construction suit control panels, instrument enclosures, and light industrial equipment where a low-profile, corrosion-resistant fastener is required.
🪑 Furniture Makers & Woodworkers
Flat washers and hex nuts pair with the button head screws for clean, flush connections in wood and composite furniture builds.
Technical Specifications
| Material |
304 Stainless Steel |
| Finish |
Passivated Silver |
| Head Style |
Button Head (Low Profile Round) |
| Drive Style |
Hex Socket (Allen / Internal Hex) |
| Thread Sizes |
M2, M3, M4, M5 (varies by kit) |
| Screw Lengths |
8 mm, 12 mm, 16 mm, 20 mm (approx. 5/16 in – 25/32 in) |
| Included Hardware |
Button Head Cap Screws, Flat Washers, Hex Nuts |
| Kit Sizes Available |
840 Pcs / 1300 Pcs / 1410 Pcs |
| Storage |
24-Compartment Transparent Plastic Case |
| Thread Standard |
Metric (ISO) |
| Weight |
See variant options |
Frequently Asked Questions
What thread standard do these screws use?
These screws follow the ISO metric thread standard. They are compatible with standard metric nuts and threaded inserts in M2, M3, M4, and M5 sizes depending on the kit selected.
What Allen key size do I need to drive these screws?
You will need a standard metric hex key (Allen wrench) set. M3 screws typically use a 2.5 mm hex key, M4 uses 3 mm, and M5 uses 4 mm. Most standard metric Allen key sets include all three sizes.
Are these screws suitable for outdoor use?
Yes. The 304 stainless steel construction with passivated surface treatment provides strong corrosion resistance, making these screws suitable for humid, outdoor, and moderately high-temperature environments.
What is the difference between the 840 Pcs, 1300 Pcs, and 1410 Pcs kits?
The 840 Pcs kit covers M3, M4, and M5 sizes. The 1300 Pcs kit adds M2 sizes and includes a larger total count across M2–M5. The 1410 Pcs kit focuses on M3 with a higher quantity of that size. Choose based on the thread sizes and volume your projects typically require.
Can I use these screws with a power drill or screwdriver?
Yes, with a compatible hex bit attachment. These button head cap screws use an internal hex socket drive, so a hex bit (Allen bit) of the correct size for your drill or screwdriver will work. Hand tightening with an Allen key is also recommended for final torque control.
Are the flat washers and hex nuts in the kit the same material as the screws?
Yes. The flat washers and hex nuts included in the kit are also made from 304 stainless steel, ensuring consistent corrosion resistance and material compatibility across the full fastener assembly.
Is the storage case included with every kit?
Yes. Every kit variant includes a 24-compartment transparent plastic storage case with labeled sections for each size, keeping your fasteners organized and easy to identify.
Stop searching for the right screw mid-project. Add this 304 stainless steel metric screw assortment kit to your toolbox and have every M3, M4, and M5 fastener you need — organized, rust-resistant, and ready to go.
