🔩 Product Overview: M6–M10 Button Head Hex Drive Screws (316 Stainless Steel)
If you’ve ever struggled with Phillips screws that cam out or need a fastener that won’t rust in a marine environment, these 316 stainless steel button head hex drive screws are your answer. The low-profile rounded head gives a clean, modern look, while the internal hex socket (Allen key drive) lets you apply serious torque without stripping. Available in M6, M8, and M10 metric diameters, they’re perfect for boat hardware, chemical equipment, outdoor furniture, or any project where corrosion from saltwater or chemicals is a real concern. Made in China to GB standards and rated Grade 5, these fully threaded machine bolts deliver strength and reliability where it counts.
✨ Why Choose 316 Stainless Button Head Hex Screws?
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316 stainless steel (marine grade) – Contains molybdenum for superior resistance to saltwater, chlorides, and industrial chemicals. Ideal for seawater equipment, dyeing machinery, paper mills, and outdoor coastal installations.
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Hex drive (Allen key) – No cam‑out like Phillips. The internal hex socket provides a positive grip, allowing higher torque without damaging the drive recess.
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Button head (low dome) – Rounded, low-profile head that sits neatly on surfaces. Won’t snag on cables, fabric, or hands. Looks great on visible assemblies.
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Metric sizes M6, M8, M10 – The most common medium-duty diameters for machinery, automotive, marine rigging, and structural fastening.
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Grade 5 strength equivalent – Strong enough for demanding applications like railings, pumps, and chemical plant components.
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Fully threaded, GB standard – Threads run the entire shank length. Maximum grip in thin materials and consistent fit with standard metric nuts.
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Length measured under the head – No confusion: an M6 x 20mm screw has 20mm of thread below the button head.
📐 Technical Specifications – Button Head Hex Screws (M6–M10, 316 SS)
| Specification |
Details |
| Product Type |
Button Head Hex Drive Machine Screws / Socket Cap Bolts |
| Material |
316 Stainless Steel (marine grade, A4 equivalent) |
| Drive Style |
Hex socket (Allen key drive) |
| Head Style |
Button Head (low-profile round dome) |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M6, M8, M10 |
| Thread Pitch (coarse) |
M6 x 1.0, M8 x 1.25, M10 x 1.5 |
| Thread Type |
Fully threaded (full length) |
| Length Measurement |
Length does NOT include head – measured from underside of head to tip (e.g., M6 x 20mm = 6mm diameter, 20mm thread length) |
| Grade |
Grade 5 (medium‑high strength) |
| Finish |
Natural stainless steel (unplated, bright) |
| Standard |
GB (Chinese National Standard) |
❓ FAQs – 316 Stainless Button Head Hex Screws
🔸 What’s the difference between 316 and 304 stainless steel?
316 contains molybdenum, which gives it much better resistance to chlorides – that means saltwater, de-icing salts, and many industrial chemicals. 304 is fine for most indoor and general outdoor use, but 316 is the go‑to for marine, coastal, and chemical environments. It's stronger in corrosive conditions and lasts significantly longer.
🔸 What hex key (Allen wrench) size do I need for M6, M8, and M10?
Standard button head hex drive sizes: M6 typically uses a 4mm hex key, M8 uses a 5mm, and M10 uses a 6mm or 8mm depending on the screw design (most common: M10 button head uses 6mm). Always check fit – a quality set of metric hex keys (3mm–10mm) will cover these.
🔸 Are these screws fully threaded or partially threaded?
They are fully threaded – threads run the entire length from under the head to the tip. This gives you maximum grip in thin materials, allows you to use the full length with nuts, and makes them versatile for many applications.
🔸 Will 316 stainless steel rust in saltwater?
316 stainless is highly resistant to saltwater corrosion and is widely used in boat hardware, dock fittings, and seawater pumps. However, no stainless is completely immune – crevice corrosion can occur in low‑oxygen, stagnant areas (like under a washer or against another metal). For most above‑water marine use and even submerged applications with good water flow, 316 performs excellently. Rinse occasionally for maximum lifespan.
🔸 Can I use these screws with nuts, or are they for tapping into metal?
These are machine screws – they are designed to be used with a matching metric nut (M6, M8, or M10) or screwed into a pre‑tapped hole. They are not self‑tapping. For best results, pair them with 316 stainless nuts to avoid galvanic corrosion.
🔸 What lengths are available? How do I choose the right length?
Lengths vary – check the product options. Measure the thickness of the materials you’re fastening, then add enough length for full nut engagement (at least 2‑3 threads beyond the nut). Length is measured from under the head (the flat bearing surface) to the tip. The button head adds extra height on top.
