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It is a machine screw with a cylindrical head and a hexagonal recess (socket) in the top. You drive it with an Allen key or hex driver. The hex socket is recessed into the head, so the tool does not protrude. This makes it perfect for applications where clearance is tight.
| Feature | Benefit |
|---|---|
| Recessed hex drive | Tool does not protrude – works in tight spaces |
| Six-point contact | Distributes torque evenly – less stripping |
| Cylindrical head | Smaller diameter than hex head – fits narrow recesses |
| High torque capacity | Can be tightened more than Phillips or slotted |
| Clean appearance | Smooth cylindrical head looks professional |
| Type | Best for |
|---|---|
| Standard socket head | General purpose, most common |
| Low profile socket head | Height restricted areas |
| Button head socket | Decorative, lower profile, lighter load |
| Flat head socket | Countersunk, flush mounting |
| Drive type | Tool required | Torque capacity |
|---|---|---|
| Hex socket | Allen key / hex driver | High |
| Torx socket | Torx driver | Very high |
| Phillips | Phillips screwdriver | Moderate |
| Slotted | Flat blade | Low |
| Material | Best for |
|---|---|
| 304 stainless steel | General corrosion protection |
| 316 stainless steel | Marine, saltwater, chemicals |
| Alloy steel | High strength, heat treated |
| Carbon steel | Cost effective, with plating |
| Brass | Non-magnetic, decorative |
| Grade | Tensile strength | Use case |
|---|---|---|
| Class 8.8 | 800 MPa | General industrial |
| Class 10.9 | 1000 MPa | Higher load |
| Class 12.9 | 1200 MPa | Maximum strength |
| Finish | Best for |
|---|---|
| Plain | Standard, cost effective |
| Zinc plated | Mild corrosion protection |
| Black oxide | Matte finish, indoor use |
| Passivated | Stainless steel, maximum corrosion resistance |
| Nickel plated | Decorative, good corrosion resistance |
Metric M2, M2.5, M3, M4, M5, M6, M8, M10, M12. Lengths from 4mm to 100mm. Standard and fine thread options. Inch sizes also available.
ISO 9001 and ISO 10012 certified. Every batch inspected. Dimensional accuracy, thread gauging, hardness testing.
Need a non-standard size, special material, or unique head marking? Send us your drawing. We manufacture to your specification. OEM orders accepted.
YH Fastener has been manufacturing precision fasteners since 1998. Our range includes socket head cap machine screws, self tapping screws, shoulder screws, and custom fasteners. ISO 9001 and ISO 10012 certified. Every batch inspected. Factory direct. Ship to 60+ countries.
