What is the tensile strength of these button head socket cap screws?

316 stainless steel socket cap screws are generally rated to a tensile strength of approximately 700–800 MPa (about 100,000–116,000 psi), depending on diameter and heat treatment. Button head variants typically have a lower drive torque limit than standard socket cap screws due to the shallower hex socket — contact us to confirm torque specs for your application.

Can I use these with a power driver or impact driver?

A hex bit adapter can be used with a power drill for driving, but impact drivers are generally not recommended for small metric socket screws — the high torque can strip the hex socket or over-torque the fastener. Hand tools or a torque-controlled driver are preferred for precise applications.

316 Stainless Steel Button Head Socket Cap Screws | M3 M4 M5 M6 M8 M10 | Hex Socket Drive - HomeDIYer

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316 Stainless Steel Button Head Socket Cap Screws | M3 M4 M5 M6 M8 M10 | Hex Socket Drive

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Material*Screw Diameter: 316 Stainless Steel*M3

Screw Length(Excluding Head): 4

Quantity(Piece): 20

Price:

$1.35 USD

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In stock (500 units), ready to be shipped

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316 Stainless Steel Button Head Socket Cap Screws — Corrosion-Resistant Fasteners for Demanding Applications

When a standard screw head is too bulky or a zinc-plated fastener simply won't hold up to moisture, builders, fabricators, and DIYers reach for 316 stainless steel button head socket cap screws. Whether you're assembling marine hardware, outdoor furniture, electronics enclosures, or precision machinery, the wrong fastener can mean stripped threads, rust stains, or a failed joint — problems these screws are built to prevent.

Each set contains 316 stainless steel button head socket cap screws with a low-profile dome head and an internal hex (Allen) drive socket. Available in diameters M3 through M10 and lengths from 4mm (≈5/32") to 100mm (≈3-15/16"), sold in packs of 20 or 50 pieces. The ISO metric coarse thread profile ensures compatibility with standard metric nuts, threaded inserts, and tapped holes.

Typical use cases include marine deck hardware and boat fittings where salt-spray resistance is critical, stainless steel button head screws for electronics and panel assemblies requiring a clean low-profile look, and structural fastening in outdoor furniture, architectural metalwork, and coastal construction projects where long-term corrosion resistance matters.

⚠️ Button head socket cap screws have a shallower hex socket than standard socket cap screws. Do not exceed the recommended drive torque for your size — contact us to confirm torque specs if needed.

🔩 Thread Compatibility: ISO metric coarse thread — M3×0.5 / M4×0.7 / M5×0.8 / M6×1.0 / M8×1.25 / M10×1.5. Compatible with standard metric nuts, threaded inserts, and tapped holes per ISO 68-1.

✅ Key Features of These 316 Stainless Steel Button Head Socket Cap Screws

🌊Marine-Grade 316 Stainless Steel — Contains molybdenum for superior chloride and salt-spray resistance compared to 304 stainless, making these screws reliable in coastal, marine, and high-humidity environments.
🔘Low-Profile Button Head Design — The wide, dome-shaped head distributes clamping load over a larger surface area, reducing the risk of pull-through in softer materials like aluminum, plastic, and wood composites.
🔑Internal Hex Socket Drive — Hex socket (Allen key) drive allows high torque transfer in tight spaces where a Phillips or slotted driver won't fit, ideal for recessed or countersunk assemblies.
📐Wide Size Range — M3 to M10, 4mm to 100mm — One consistent product line covers light-duty electronics fastening (M3 × 4mm) through structural applications (M10 × 100mm ≈ 3-15/16"), reducing the need to source from multiple suppliers.
📦Flexible Pack Quantities — Choose packs of 20 for small repairs or prototyping, or packs of 50 for production runs and larger projects — both options ship from our US warehouse for fast delivery.
⚙️ISO Metric Coarse Thread Standard — Fully compatible with standard metric nuts, hex standoffs, threaded inserts, and tapped holes following ISO 68-1, ensuring reliable thread engagement without cross-threading risk.

📐 Technical Specifications — 316 Stainless Steel Button Head Socket Cap Screws

Material	316 Stainless Steel (A4 equivalent)
Head Style	Button Head (low-profile dome)
Drive Type	Internal Hex Socket (Allen / Hex Key)
Thread Standard	ISO Metric Coarse (ISO 68-1)
Available Diameters	M3, M4, M5, M6, M8, M10
Available Lengths (excl. head)	4mm – 100mm (≈5/32" – 3-15/16")
Hex Key Sizes	M3: 2mm \| M4: 2.5mm \| M5: 3mm \| M6: 4mm \| M8: 5mm \| M10: 6mm
Pack Quantities	20 pcs or 50 pcs per order
Tensile Strength	Typically 700–800 MPa (see variant options for confirmation)
Corrosion Resistance	Excellent — suitable for marine and outdoor use
Finish	Mill / natural stainless (no coating)
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right screw length for my project?

A general rule: the engaged thread length should be at least 1.5× the screw diameter for steel, and 2× for softer materials like aluminum or plastic. For example, an M5 screw threading into aluminum typically needs at least 10mm of engagement. Lengths listed are measured excluding the head. Quick inch reference: 25mm ≈ 1", so a 50mm (≈2") screw works well for through-bolting 40mm material with a nut.

What is the tensile strength and load capacity of these screws?

316 stainless steel socket cap screws are generally rated to a tensile strength of approximately 700–800 MPa (about 100,000–116,000 psi). Button head variants typically have a lower maximum drive torque than standard socket cap screws due to the shallower hex socket depth. Contact us to confirm torque specifications for your specific diameter and application.

Are these screws safe for marine and outdoor use?

Yes. 316 stainless steel contains molybdenum (typically 2–3%), which significantly improves resistance to chloride-induced pitting and crevice corrosion compared to 304 stainless. These screws are well-suited for marine hardware, boat fittings, outdoor furniture, coastal construction, and any environment with regular salt spray or moisture exposure.

What thread standard do these screws follow, and are they compatible with standard metric hardware?

These screws use the ISO metric coarse thread standard: M3×0.5, M4×0.7, M5×0.8, M6×1.0, M8×1.25, M10×1.5. They are compatible with standard metric nuts, hex standoffs, threaded inserts, and tapped holes following ISO 68-1 specifications — the same standard used by most metric hardware worldwide.

What hex key (Allen wrench) size do I need for each diameter?

Hex socket sizes per ISO 4762: M3 → 2mm, M4 → 2.5mm, M5 → 3mm, M6 → 4mm, M8 → 5mm, M10 → 6mm. Always use a properly fitting, high-quality hex key to avoid rounding the socket, especially on smaller sizes like M3 and M4.

Why choose a button head over a standard socket cap screw?

Button head socket cap screws have a wider, lower-profile dome head that distributes clamping load over a larger bearing surface, making them a better choice for softer materials (aluminum, plastic, wood composites) and applications where a flush or decorative appearance is desired. Standard socket cap screws have a taller cylindrical head with a deeper socket, allowing higher torque — use those where maximum clamping force is the priority.

Can I use these with a power drill or impact driver?

A hex bit adapter works with a power drill for driving, but impact drivers are generally not recommended for small metric socket screws — the high rotational torque can strip the hex socket or over-torque the fastener, especially on M3–M5 sizes. A torque-controlled electric screwdriver or hand hex key is preferred for precise, damage-free installation.

🛒 Select your diameter and length above, then add to cart — ships from our US warehouse.