⭐ M8 Torx Countersunk Machine Screws – A2 Stainless Steel, 6‑Lobe Drive, Fully Threaded (Overall Length Includes Head)
You’re bolting down a machine guard, installing stainless steel hinges on a boat, or assembling outdoor furniture – and you need a flush‑fitting screw that won’t rust or slip. These M8 Torx countersunk screws are made from A2 stainless steel (304), offering excellent corrosion resistance for outdoor, marine, and industrial environments. The 90° flat head sinks flush into a pre‑drilled countersink, leaving a smooth, snag‑free surface. The six‑lobe Torx drive eliminates cam‑out, even under high torque, making it ideal for power tools. Lengths are measured overall (including the head), and every screw is fully threaded for maximum grip. Perfect for decking, machinery, automotive trim, and any application where a strong, rust‑proof, low‑profile fastener is required.
✨ Key Features – M8 Torx Countersunk Machine Screws (A2 Stainless)
- ⭐ Torx (6‑lobe) drive – No cam‑out, even at high torque. The star shape distributes force evenly, reducing wear on bits and screw recesses.
- 🔽 Countersunk flat head (90°) – Sits flush with the surface after proper countersinking. Ideal for smooth, professional finishes.
- 🛡️ A2 stainless steel (304) – Excellent corrosion resistance, oxidation resistance, and durability. Won’t rust like carbon steel.
- 📏 M8 metric thread (8mm diameter) – Popular size for medium‑heavy fastening in machinery, furniture, and marine hardware.
- 📐 Overall length includes head – Example: M8 x 20mm means total length from top of head to tip is 20mm. Fully threaded for maximum grip.
- 🔧 Fully threaded, coarse pitch – Threads run the entire length under the head. Provides excellent holding power in blind holes or with nuts.
- ⚙️ Widely used – Industrial machinery, marine hardware, outdoor furniture, automotive trim, and general construction.
📏 Specifications – M8 Torx Countersunk Screws (A2 Stainless, Fully Threaded)
| Thread Diameter |
Thread Pitch (mm) |
Overall Length Range (mm, including head) * |
Head Style |
Drive |
Material |
| 📐 Length = from top of head to tip (total screw length). Fully threaded. Select exact length from dropdown. |
| M8 |
1.25 mm |
10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100 |
Countersunk / Flat (90°) |
Torx (6‑lobe) |
A2 304 Stainless Steel |
* Typical lengths shown – exact availability may vary. Please allow minor manual measurement errors. Torx bit size approx. T25 or T30 (check fit).
📋 Why Torx Drive for Countersunk Screws?
| Feature |
Benefit |
| No cam‑out |
Torx geometry keeps the bit fully engaged, even under high torque – no slipping out and damaging the screw or workpiece. |
| Higher torque capacity |
Ideal for power tools and applications where you need to tighten firmly without stripping the recess. |
| Even force distribution |
The six lobes spread stress evenly, reducing wear on both the driver bit and the screw recess. |
| A2 stainless |
Corrosion resistant, non‑magnetic, strong – perfect for marine, outdoor, and industrial use. |
❓ Frequently Asked Questions – M8 Torx Countersunk Screws
1. How do I measure the length of a countersunk Torx screw?
For countersunk screws, the length is measured overall – from the top of the head to the tip. So an “M8 x 20mm” screw has a total length of 20mm including the head. This matches our listing.
2. Do I need to countersink the hole for these screws to sit flush?
Yes – these are true 90° countersunk screws. To achieve a flush or slightly recessed finish, you must drill a matching 90° countersink hole. Use a countersink bit slightly larger than the screw head diameter.
3. Are these screws fully threaded?
Yes – all M8 screws in this range (up to 100mm overall length) are fully threaded from under the head to the tip, giving you maximum grip in both blind holes and through‑nut applications.
4. Can I use these screws outdoors or in a marine environment?
Absolutely – A2 stainless steel (304) is highly corrosion‑resistant and is the standard choice for outdoor furniture, marine hardware (above waterline), and coastal environments. For continuous saltwater immersion, consider A4 (316) stainless, but for most decks, boat fittings, and outdoor projects, A2 is excellent.
5. What Torx bit size do I need for M8 screws?
Typically, M8 Torx countersunk screws use a T25 or T30 Torx bit. Always check the fit – a quality bit should fit snugly without wobbling to avoid stripping the recess.
6. Can I use these screws with a nut? What size nut fits?
Yes – these are machine screws. Use a standard M8 metric nut (1.25mm pitch). They will also thread into pre‑tapped M8 holes. They are not self‑tapping – for wood or plastic, use a threaded insert or nut on the back.
