🔩 Product Overview: M8 & M10 Countersunk Socket Head Screws – 304 Stainless Steel (A2, Grade 4.8)
Need a fastener that sits completely flush with the surface and won't rust, even in damp or outdoor environments? These M8 and M10 countersunk socket head machine screws are made from 304 stainless steel – strong, corrosion‑resistant, and perfect for furniture, machinery, marine hardware, and architectural trim. The flat 90° countersunk head sinks neatly into tapered holes, leaving a smooth, snag‑free finish. The internal hex (Allen) drive lets you apply high torque without slipping or stripping. Available in lengths from 10mm to 150mm – and yes, length includes the head, so an M8 x 30mm screw is exactly 30mm total. Fully threaded with standard coarse pitch, these Grade 4.8 bolts are a reliable choice for both professional builders and serious DIYers.
✨ Why Choose 304 Stainless Countersunk Hex Drive Screws
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304 stainless steel (A2 grade) – Excellent corrosion, oxidation, and heat resistance. High strength and toughness. Perfect for outdoor furniture, kitchen equipment, and industrial use.
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Countersunk flat head – Sits flush in tapered holes. Leaves a smooth, professional surface – no snagging, no protruding heads.
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Hex socket (Allen) drive – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping. Use a standard metric hex key.
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M8 & M10 metric sizes – Versatile diameters for heavy furniture, machinery, railings, and structural fastening.
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Lengths from 10mm to 150mm (including head) – Short screws for thin panels, extra‑long ones for thick assemblies. Choose exactly what you need.
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Fully threaded, coarse metric pitch – M8x1.25, M10x1.5. Threads run the entire length for maximum grip and easy nut engagement.
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Grade 4.8 strength – Strong enough for most general fastening applications, from furniture to light machinery.
📏 Technical Specifications – M8 & M10 Countersunk Socket Head Screws
| Specification |
M8 |
M10 |
| Thread Diameter (D) |
8mm |
10mm |
| Thread Pitch (P) |
1.25mm |
1.5mm |
| Head Diameter (DK) |
15.57–16mm (approx) |
19.48–20mm (approx) |
| Head Height (K) |
6.2mm (approx) |
7.6mm (approx) |
| Hex Socket Size (S) |
5mm |
6mm |
| Drive Depth (T) |
3.5–3.2mm |
4.4–4.1mm |
| Material |
304 Stainless Steel (A2) |
| Grade |
4.8 |
| Thread Type |
Fully threaded, coarse |
| Length Range (including head) |
10mm – 150mm (select from options) |
| Drive Style |
Hex key (Allen), metric |
| Standard |
GB / DIN (reference dimensions) |
❓ FAQs – Countersunk Socket Head Screws (M8/M10, 304 Stainless)
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from the tip up to the underside of the head. Length is measured including the head (total screw length). For example, an M8 x 30mm screw is 30mm long overall from the top of the flat head to the tip – that's standard for countersunk fasteners.
🔸 What hex key (Allen wrench) size do I need for M8 and M10?
For M8 countersunk socket head screws, use a 5mm hex key. For M10, use a 6mm hex key. A standard metric hex key set will cover these sizes easily.
🔸 Will 304 stainless steel rust in outdoor or coastal environments?
304 stainless is highly resistant to moisture, rain, and humidity – perfect for most outdoor use. For direct saltwater immersion or heavy coastal spray, 316 stainless (A4) is better, but for garden furniture, railings, and general outdoor DIY, 304 lasts for years without rust.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are machine screws – they require a matching M8 or M10 nut or a pre‑tapped hole. They are not self‑tapping. For best corrosion resistance, pair them with 304 stainless nuts.
🔸 What lengths are available for M8 and M10?
We offer lengths from 10mm up to 150mm. Please select your desired length from the dropdown options on the product page. Typical increments: 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 150mm.
🔸 Are these screws magnetic?
304 stainless is generally non‑magnetic in its annealed state, but cold forming (like thread rolling) can make it slightly magnetic. A light magnetic response is normal and does not affect corrosion resistance or strength.
