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You’re mounting a hinge flush to a door, assembling outdoor furniture, or repairing a boat – and you need the screw head to sit perfectly level with the surface. These Phillips countersunk flat head screws come with matching A2 stainless steel nuts, so you get a complete fastening solution in one order. Made from 304 (A2) stainless, they resist rust even in humid or coastal environments. The 90° flat head sinks cleanly into a countersunk hole, leaving a smooth, snag‑free finish. Available from M2 (tiny) up to M10 (heavy duty), with screw lengths from 3mm to 180mm. No more hunting for matching nuts – we’ve included them.
| Thread Size (M) | Thread Pitch (mm) | Length Range (mm, overall) | Nut Included |
|---|---|---|---|
| M2 | 0.4 | 3 – 20 | Yes, A2 stainless |
| M2.5 | 0.45 | 3 – 25 | Yes, A2 stainless |
| M3 | 0.5 | 3 – 40 | Yes, A2 stainless |
| M4 | 0.7 | 4 – 60 | Yes, A2 stainless |
| M5 | 0.8 | 4 – 80 | Yes, A2 stainless |
| M6 | 1.0 | 5 – 120 | Yes, A2 stainless |
| M8 | 1.25 | 6 – 150 | Yes, A2 stainless |
| M10 | 1.5 | 8 – 180 | Yes, A2 stainless |
📌 Length measured from the top of the countersunk head to the tip (overall length). All screws are fully threaded unless noted. Nuts are standard hex style, same A2 material.
| Parameter | Details |
|---|---|
| Brand | Goo Bettter |
| Material | A2 stainless steel (304 grade) – screw and nut |
| Head style | Countersunk flat head (90°) |
| Drive style | Phillips (cross recess) |
| Thread sizes | M2, M2.5, M3, M4, M5, M6, M8, M10 |
| Length range (overall) | 3mm – 180mm (varies by size) |
| Included nuts | Matching A2 stainless hex nuts, same thread |
| Measurement system | Metric |
| Grade | A2 (304) – corrosion resistant, non‑magnetic (slightly magnetic after cold forming) |
| Applications | Car/motorcycle repair, DIY, appliances, machinery, boat assembly, furniture, outdoor equipment |
🌊 Built for harsh environments – A2 stainless (304) provides superior rust resistance for outdoor use, humidity, and mild salt exposure. For continuous saltwater immersion, consider upgrading to A4 (316) – contact us for custom orders.
1. Do I need to countersink the hole for these screws?
Yes – for the flat head to sit flush with the surface, you’ll need to drill a 90° countersunk hole. If you drive them into a straight hole, the head will sit proud. Use a countersink bit the same size as the screw head. In soft wood, you can sometimes tap it in, but proper countersinking looks much better and prevents splitting.
2. Are the nuts included for every screw size?
Yes – each screw comes with one matching A2 stainless hex nut in the same thread size. If you need additional nuts or lock nuts, you can select extra quantities in the options (contact us for bulk).
3. Will these screws rust if used outdoors or near the ocean?
A2 (304) stainless offers excellent resistance for most outdoor applications – rain, humidity, and even mild coastal spray. For permanent saltwater immersion (boat hulls below waterline) or heavy chemical exposure, we recommend A4 (316) stainless. But for garden furniture, decking, and general outdoor use, A2 is perfectly reliable and will not rust like ordinary steel.
4. How do I measure the length of a countersunk screw?
For countersunk (flat head) screws, the length is measured overall – from the top of the head to the tip. Place the screw head‑down on a ruler; the measurement includes the head. Our lengths (3–180mm) are overall. This is different from pan head screws where length is under the head.
5. What Phillips bit size should I use for each M size?
M2–M2.5 use PH0, M3–M4 use PH1, M5–M6 use PH2, M8–M10 use PH3. Using the correct size prevents stripping the cross recess and ensures good torque transfer.
6. Are these screws fully threaded?
Most lengths up to about 60mm are fully threaded. For longer lengths (80mm and above), there may be a short unthreaded shank under the head. If you need fully threaded for a specific long size, please contact us to verify before ordering.
