🔩 Product Overview: M5–M12 Flange Cap Head Hex Socket Screws – 304 Stainless Steel
When you need a fastener that combines a built‑in washer, high torque capability, and excellent corrosion resistance, these flange cap head hex socket bolts are the answer. The integrated flange distributes clamping pressure evenly – no separate washer required. Made from 304 stainless steel (A2 grade), they offer outstanding resistance to rust, oxidation, and heat, plus high strength and toughness. Available in metric sizes M5 to M12, with lengths from 8mm to 60mm (measured under the head). The hex socket (Allen) drive eliminates cam‑out and allows precise torque control. Perfect for machinery, automotive assemblies, furniture, marine hardware, and any application where a secure, vibration‑resistant joint is needed.
✨ Why Choose 304 Stainless Steel Flange Hex Screws
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Integrated flange head – Built‑in washer distributes load, protects surfaces, and eliminates the need for a separate flat washer. Saves assembly time and parts.
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304 stainless steel (A2 grade) – Excellent corrosion, oxidation, and heat resistance. High strength and high toughness for demanding environments.
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Hex socket (Allen) drive – Internal hex provides positive engagement, eliminates cam‑out, and allows high torque without stripping.
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Metric sizes M5, M6, M8, M10, M12 – Covers the most common medium‑to‑large diameters for industrial machinery, automotive, and structural fastening.
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Lengths from 8mm to 60mm (under head) – Short screws for thin panels, longer ones for through‑hole assemblies. Choose exactly what you need.
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Fully threaded, coarse metric pitch – Standard threads: M5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75. Threads run the entire shank length for maximum grip.
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Wide application range – Manufacturing, furniture decoration, automotive, marine, machinery, and general industrial fastening.
📏 Technical Specifications – Flange Cap Head Hex Screws (M5–M12)
| Specification |
Details |
| Product Type |
Flange Cap Head Hex Socket Machine Screws |
| Material |
304 Stainless Steel (A2 grade) |
| Drive Style |
Hex key (Allen) – internal hex socket |
| Head Style |
Flange cap head (integrated washer flange) |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M5, M6, M8, M10, M12 |
| Thread Pitches (coarse) |
M5x0.8, M6x1.0, M8x1.25, M10x1.5, M12x1.75 |
| Thread Type |
Fully threaded |
| Length Range (under head) |
8mm – 60mm (select from options) |
| Length Measurement |
Under head – from flat bearing surface to tip (head not included) |
| Finish |
Natural stainless (unplated) |
❓ FAQs – Flange Hex Socket Screws
🔸 What is the advantage of a flange head over a regular socket cap head?
The integrated flange acts as a built‑in washer. It distributes clamping force over a larger area, protects the surface from damage, and eliminates the need for a separate flat washer. This also helps prevent loosening under vibration. Flange heads are ideal for applications where a washer would be inconvenient or add extra steps.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the flange head. For example, an M8 x 20mm screw has a 20mm threaded shank.
🔸 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, A4 (316) stainless is better, but for general outdoor furniture, machinery, and automotive use, 304 lasts for years without rust.
🔸 What hex key (Allen wrench) size do I need for M5 through M12?
Standard hex socket sizes: M5 uses 4mm, M6 uses 5mm, M8 uses 6mm, M10 uses 8mm, M12 uses 10mm (check product head for exact size). A quality metric hex key set will cover these.
🔸 Can I use these screws with nuts, or are they self‑tapping?
These are standard machine screws – they require a matching metric nut (M5–M12) 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 each diameter?
We offer lengths from 8mm to 60mm. Typical ranges: M5: 8–30mm; M6: 10–40mm; M8: 12–50mm; M10: 16–60mm; M12: 20–60mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.
