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When you need a self-tapping screw that can handle serious torque without stripping, the hex socket cap design is the answer. These Grade 8.8 carbon steel fasteners combine high tensile strength with a black oxide finish for dependable performance in sheet metal, wood, plastics, and machine assembly. The internal hex drive allows you to apply more seating force than a Phillips or slotted screw, making it ideal for tight installations where a standard driver would cam out. Available from M2 up to M6 with lengths ranging from 5 mm to 60 mm, they cover everything from precision electronics enclosures to heavy-duty brackets and automotive brackets. Whether you’re a machinist, fabricator, or dedicated DIYer, this series gives you the strength and control you need without the complexity of separate taps.
| Diameter | Thread Size | Available Lengths (mm) (not including head) |
Head Style | Drive | Material & Finish | Grade |
|---|---|---|---|---|---|---|
| M2 | 2.0 mm | 5, 6, 8, 10, 12 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M2.6 | 2.6 mm | 6, 8, 10, 12, 14, 16 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M3 | 3.0 mm | 6, 8, 10, 12, 14, 16, 20, 25 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M3.5 | 3.5 mm | 8, 10, 12, 14, 16, 20, 25, 30 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M4 | 4.0 mm | 10, 12, 14, 15, 16, 20, 25, 30, 35, 40 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M5 | 5.0 mm | 12, 14, 16, 20, 25, 30, 35, 40, 50 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
| M6 | 6.0 mm | 16, 20, 25, 30, 35, 40, 50, 60 | Socket Cap | Hex (Allen) | Carbon Steel, Black Oxide | 8.8 |
* Lengths vary per pack selection. All dimensions meet GB/T standards. The exact composition of each package is shown in the listing options.
For thin sheet metal (up to about 1.5 mm) and soft plastics, you can often drive them straight in without a pilot hole. For thicker steel, hardwoods, or dense composites, drilling a hole about 80% of the screw diameter will protect the thread and make installation much easier.
The required hex key size depends on the screw diameter: 1.5 mm (M2), 2.0 mm (M2.6 & M3), 2.5 mm (M3.5 & M4), 3.0 mm (M5), and 4.0 mm (M6). A standard metric hex key set covers all these sizes.
Grade 8.8 offers a minimum tensile strength of about 800 MPa, which is more than sufficient for most mechanical assemblies, machinery brackets, automotive components, and furniture connections. For critical structural joints, always check your load requirements and consider a higher grade if needed.
The black oxide finish provides mild corrosion resistance, making it suitable for indoor and limited outdoor use. For long‑term exposure to rain or humidity, we recommend stainless steel fasteners or applying a protective anti‑rust coating.
Yes. All listed lengths refer to the threaded shaft only, measured from the bottom of the cap head. The head height is not included, so you can accurately match the screw length to your material thickness.
