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Digging through a tangled bag of mixed fasteners mid-project wastes time and kills momentum. Whether you're building electronics enclosures, assembling furniture, maintaining motorcycles, or tackling general DIY repairs, having a well-organized, multi-size screw and nut kit on hand means you always have the right fastener ready to go. This 500-piece set covers the three most common metric sizes — M3, M4, and M5 — in four lengths each, paired with matching hex nuts, all stored in a compartmentalized box.
Every bolt in this kit is machined from A2-70 (304) stainless steel to ISO 7380 standard, featuring a low-profile button head with Allen (hex socket) drive. Thread pitches are M3×0.5mm, M4×0.7mm, and M5×0.8mm. The kit includes 260 bolts across 12 size combinations and 250 matching hex nuts — totaling 500 pieces. Weight: approx. 0.54 kg.
Ideal for household and office equipment assembly, electronics and communication device maintenance, ship and machinery industry fastening, furniture construction, and car or motorcycle DIY work where a corrosion-resistant, low-profile bolt head is required.
| Size | Length | Quantity |
|---|---|---|
| M3 Button Head Bolt | 8mm | 30 pcs |
| M3 Button Head Bolt | 12mm | 30 pcs |
| M3 Button Head Bolt | 16mm | 30 pcs |
| M3 Button Head Bolt | 20mm | 30 pcs |
| M3 Hex Nut | — | 120 pcs |
| M4 Button Head Bolt | 8mm | 20 pcs |
| M4 Button Head Bolt | 12mm | 20 pcs |
| M4 Button Head Bolt | 16mm | 20 pcs |
| M4 Button Head Bolt | 20mm | 20 pcs |
| M4 Hex Nut | — | 80 pcs |
| M5 Button Head Bolt | 8mm | 15 pcs |
| M5 Button Head Bolt | 12mm | 15 pcs |
| M5 Button Head Bolt | 16mm | 10 pcs |
| M5 Button Head Bolt | 20mm | 10 pcs |
| M5 Hex Nut | — | 50 pcs |
| Compartmentalized Storage Box | — | 1 pc |
| Total | 500 Pieces | |
The low-profile button head sits flush on panels and enclosures without snagging — M3 and M4 sizes cover most PCB standoffs, case assembly, and rack-mount hardware needs.
Keep this kit in the workshop for furniture assembly, appliance repairs, and general household fastening tasks. The storage box means you'll always find the right size quickly.
M5 bolts handle fairings, brackets, and trim panels on motorcycles and small vehicles where a clean, low-profile head is preferred over a standard hex cap.
ISO 7380 A2-70 grade meets the requirements for communication equipment, ship assembly, and light machinery applications where corrosion resistance and consistent thread quality matter.
| Total Pieces | 500 |
|---|---|
| Material | A2-70 (304) Stainless Steel |
| Standard | ISO 7380 |
| Head Style | Button Head (Low Profile Round Head) |
| Drive Style | Allen Key (Hex Socket) |
| Thread Sizes | M3, M4, M5 |
| Thread Pitches | M3 – 0.5mm / M4 – 0.7mm / M5 – 0.8mm |
| Bolt Lengths | 8mm, 12mm, 16mm, 20mm (per size) |
| Nuts Included | M3 × 120 pcs / M4 × 80 pcs / M5 × 50 pcs |
| Measurement System | Metric |
| Set Weight | Approx. 0.54 kg (1.19 lbs) |
| Storage | Compartmentalized transparent plastic organizer box |
The kit includes M3 bolts (8/12/16/20mm, 30 pcs each) with 120 M3 hex nuts; M4 bolts (8/12/16/20mm, 20 pcs each) with 80 M4 hex nuts; and M5 bolts (8/12/16/20mm, 10–15 pcs each) with 50 M5 hex nuts — 500 pieces total in a compartmentalized storage box.
Drive sizes vary by bolt diameter: M3 bolts typically use a 2mm hex key, M4 bolts use a 2.5mm hex key, and M5 bolts use a 3mm hex key. An Allen key is not included in this kit — you'll need a standard metric hex key set.
Both use an Allen (hex socket) drive, but button head screws have a wider, lower-profile dome head that distributes load over a larger surface area and sits more flush against the workpiece. Socket cap screws have a taller, narrower cylindrical head with higher clamping force. Button heads are preferred where a clean, low-profile appearance is needed.
A2 (304) stainless steel offers good corrosion resistance for most indoor and sheltered outdoor applications. For prolonged exposure to saltwater or highly corrosive environments, A4 (316) stainless steel would be more appropriate. These bolts are well-suited for general DIY, electronics, furniture, and light machinery use.
ISO 7380 is the international standard for button head socket cap screws. It specifies the dimensions, tolerances, and mechanical properties of the head and thread, ensuring consistent fit and performance across manufacturers. A2-70 refers to the material grade (304 stainless steel) and minimum tensile strength (700 MPa).
Yes. If your application has a pre-tapped hole (threaded insert, tapped metal, or threaded plastic), you can use the bolts without the hex nuts. The nuts are included for applications where you're bolting through an untapped material and need a nut on the back side to secure the joint.
These bolts use standard metric coarse thread pitches: M3 – 0.5mm, M4 – 0.7mm, M5 – 0.8mm. These are the most common thread pitches for M3–M5 metric fasteners and are compatible with standard metric nuts and tapped holes of the same pitch.
