🔩 Torx Socket Cap Head Screws – M2 to M5, A2 Stainless Steel, Security Machine Bolts (304 Stainless)
You’re working on a high‑vibration machine, a security enclosure, or a piece of industrial equipment – and you need screws that stay put and resist cam‑out. These Torx socket cap head screws are made from A2 stainless steel (304) for excellent corrosion resistance and strength. The Torx (star) drive virtually eliminates bit slippage, even under high torque, and the cylindrical cap head allows deep socket engagement for secure fastening. Available in M2, M2.5, M3, M4, and M5 diameters with fully threaded bodies. Ideal for automotive assemblies, electronics mounts, machine guarding, and any application where a clean, high‑strength, tamper‑resistant fastener is required.
✨ Key Features – Torx Socket Cap Head Machine Screws
- 🔘 Socket cap head (cylindrical) – High head profile provides deep Torx engagement. Allows high torque without stripping, perfect for machine assembly.
- ⭐ Torx (star) drive – No cam‑out, even at high torque. The six‑lobe design distributes force evenly, reducing wear on bits and screw recesses.
- 🛡️ A2 stainless steel (304) – Excellent corrosion resistance. Suitable for indoor, outdoor, and light marine environments. Won’t rust like carbon steel.
- 📏 Metric sizes M2, M2.5, M3, M4, M5 – Perfect for small to medium fastening tasks in electronics, automotive, and machinery.
- 📐 Fully threaded coarse pitch – Thread runs the entire length under the head. Maximum grip in blind holes or through‑nut applications.
- 💪 High strength & durability – 304 stainless offers excellent tensile strength and toughness. Natural silver finish, no added coatings.
- 🔧 Widely used – Automotive components, electronic enclosures, machine parts, security hardware, and industrial equipment.
📏 Available Sizes – M2 to M5 Torx Socket Cap Screws (A2 Stainless)
| Thread Diameter |
Typical Lengths (mm, under head) * |
Thread Pitch (mm) |
Head Style |
Drive |
Material |
| 📐 Length measured from under the head (grip length). Fully threaded. Select exact size from dropdown. |
| M2 |
3, 4, 5, 6, 8, 10, 12, 16, 20 |
0.4 |
Socket cap (cylindrical)
|
Torx (star)
|
A2 304 Stainless
|
| M2.5 |
4, 5, 6, 8, 10, 12, 16, 20, 25 |
0.45 |
| M3 |
4, 5, 6, 8, 10, 12, 16, 20, 25, 30 |
0.5 |
| M4 |
5, 6, 8, 10, 12, 16, 20, 25, 30, 35, 40 |
0.7 |
| M5 |
6, 8, 10, 12, 16, 20, 25, 30, 35, 40, 45, 50 |
0.8 |
* Lengths are typical – exact availability varies by diameter. Please allow minor manual measurement errors. Torx bit sizes (approx.): M2→T6, M2.5→T7, M3→T8, M4→T10, M5→T15.
📋 Why Choose Torx Socket Cap Screws?
| Feature |
Benefit |
| Torx drive |
Eliminates cam‑out – ideal for power tools and high‑torque applications. No stripped recesses. |
| Socket cap head |
Tall cylindrical head allows deep bit engagement and high clamping force. Clean, industrial look. |
| A2 stainless steel |
Corrosion resistant, non‑magnetic, strong. Suitable for food equipment, marine, and outdoor use. |
| Fully threaded |
Maximum thread engagement in blind holes or when using nuts. No unthreaded shank. |
❓ Frequently Asked Questions – Torx Socket Cap Screws
1. What's the difference between a socket cap head and a button head?
Socket cap heads are taller and cylindrical, providing a deeper drive recess for higher torque. Button heads are low profile and rounded, used when head height is limited. Socket caps are the standard for high‑strength machine assembly.
2. Are these screws suitable for outdoor or marine use?
A2 stainless (304) is highly corrosion‑resistant and works well outdoors, including coastal areas. For continuous saltwater immersion (e.g., below waterline), we recommend A4 (316) stainless. For most above‑water marine hardware, garden equipment, and outdoor machinery, A2 is excellent.
3. How do I measure the length of a socket cap screw?
For socket cap screws, length is measured from the underside of the head to the tip. The head height is NOT included. So an “M5 x 20mm” screw has a 20mm long threaded shaft under the head.
4. What Torx bit size do I need for each screw?
Approximate matching: M2 uses T6, M2.5 uses T7, M3 uses T8, M4 uses T10, M5 uses T15. Always use a quality Torx bit that fits snugly to avoid stripping the recess.
5. Are these screws fully threaded? What about longer lengths?
Yes – all screws in this range (up to the listed lengths) are fully threaded from under the head to the tip. For longer lengths (e.g., M5 above 50mm), some may have partial threads. Contact us if you need full thread on longer sizes.
6. Do you offer discounts for large quantities?
Yes – we offer volume discounts for bulk orders. Please contact us with your required quantities and sizes, and we’ll provide a competitive quote. We also carry other sizes and drive types in our store.
