Socket Head Cap Screws Allen Hex Drive 304 Stainless Steel M2-M14

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Socket Head Cap Screws Allen Hex Drive 304 Stainless Steel M2-M14

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Material*Screw Diameter: 304 Stainless Steel*M2

Screw Length(Excluding Head): 3

Quantity(Piece): 10

Price:

$5.13 USD

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In stock (500 units), ready to be shipped

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304 Stainless Steel Socket Head Cap Screws — Reliable Fastening Across Every Build

Whether you're assembling precision machinery, mounting electronics, or tackling a structural DIY project, finding a fastener that combines a low-profile head, reliable torque transfer, and corrosion resistance in one package is rarely straightforward. These 304 stainless steel socket head cap screws are designed for engineers, makers, and tradespeople who need a fastener that performs consistently without adding bulk or rusting out over time.

Each order contains individually counted pieces (available in packs of 10 or 20) of socket head cap screws machined from 304 stainless steel. Diameters range from M2 to M14, and shaft lengths (measured excluding the head) span from 3mm (≈1/8") to 150mm (≈5.9"), giving you the flexibility to match the exact grip length your application requires. The cylindrical head features a precision-machined internal hex socket for clean, cam-out-resistant driving.

Typical use cases include CNC machine frames and linear rail mounting, electronics enclosures and PCB standoff assemblies, outdoor furniture and garden structures where mild corrosion resistance is needed, and general-purpose metric fastening in automotive, robotics, and fabrication workflows.

🔩 Compatibility: ISO metric coarse thread (M2–M14). Fits standard metric hex nuts (DIN 934), flat washers (DIN 125), and tapped holes machined to ISO 68-1 tolerances. Requires a metric hex key (Allen wrench) — see FAQ for size-by-diameter chart.

⚠️ Spec Confirmation: Thread pitch follows ISO metric coarse standards. If your application requires fine-pitch threads or a specific tolerance class, please contact us to confirm before ordering.

✅ Key Features of These Socket Head Cap Screws

🔧Internal Hex (Allen) Drive — The precision-machined socket allows high torque application in confined spaces where a standard hex head wrench cannot reach, making these ideal for recessed bolt patterns and tight machine assemblies.
🛡️304 Stainless Steel Construction — Offers solid resistance to oxidation and mild corrosion, suitable for indoor mechanical assemblies, outdoor structures in non-marine environments, and applications exposed to occasional moisture.
📐Wide Size Range: M2 to M14 — A single listing covers diameters from M2 (≈0.079") to M14 (≈0.551"), with lengths from 3mm to 150mm, reducing the need to source fasteners from multiple suppliers for multi-diameter projects.
🔁ISO Metric Coarse Thread Standard — Compatible with the vast majority of metric nuts, inserts, and tapped holes used in machinery, electronics, and fabrication, ensuring interchangeability across your existing hardware inventory.
📦Flexible Pack Quantities — Available in 10-piece or 20-piece packs, letting you order exactly what you need for a single repair job or a larger production run without committing to bulk quantities.
⚙️Cylindrical Low-Profile Head Design — The socket head cap screw profile sits flush or slightly proud of the surface, allowing mating parts to slide over or seat against the head without interference — a common requirement in linear motion and clamping applications.

📐 Technical Specifications — Socket Head Cap Screws

Material	304 Stainless Steel (A2 equivalent)
Drive Type	Internal Hex (Allen / Socket)
Head Style	Cylindrical Socket Head Cap
Thread Standard	ISO Metric Coarse (DIN 912 profile)
Diameter Range	M2, M2.5, M3, M4, M5, M6, M8, M10, M12, M14
Length Range (Excl. Head)	3mm (≈1/8") – 150mm (≈5.9")
Pack Quantity	10 pieces or 20 pieces (select variant)
Hex Key Size	See variant options (1.5mm–12mm depending on diameter)
Tensile Strength	Typically 500–700 MPa (varies by diameter)
Corrosion Resistance	Good — suitable for non-marine outdoor and indoor use
Surface Finish	Natural stainless (no coating)
Country of Origin	Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right length for a socket head cap screw?

The grip length should generally equal the total thickness of the parts being clamped, excluding the threaded engagement depth. As a rule of thumb, thread engagement should be at least 1× the screw diameter in steel and 1.5× in softer materials like aluminum. For example, an M5 screw clamping 10mm of material typically needs a 10–12mm length (excluding head). All lengths listed on this page are measured excluding the head.

What is the tensile strength of these 304 stainless steel socket head cap screws?

304 stainless steel socket head cap screws generally have a tensile strength of approximately 500–700 MPa, depending on diameter and manufacturing process. They are suitable for moderate-load structural and mechanical applications. For high-stress or safety-critical joints, consider 316 or A4-80 grade fasteners.

Can these screws be used outdoors or in wet environments?

Yes. 304 stainless steel offers good corrosion resistance in most outdoor and mildly humid environments. It is generally suitable for fresh water, mild weather, and non-chlorinated conditions. For marine or high-chloride environments (e.g., coastal installations, saltwater exposure), 316 stainless steel is typically recommended.

What thread standard do these socket head cap screws use?

These screws follow the ISO metric coarse thread standard (e.g., M3×0.5, M5×0.8, M6×1.0). They are compatible with standard metric nuts, threaded inserts, and tapped holes machined to ISO 68-1 tolerances. They are not compatible with UNC/UNF inch-standard threads.

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

The required hex key size varies by diameter: M2 → 1.5mm, M2.5 → 2mm, M3 → 2.5mm, M4 → 3mm, M5 → 4mm, M6 → 5mm, M8 → 6mm, M10 → 8mm, M12 → 10mm, M14 → 12mm. Always verify with a calibrated hex key set before applying full torque.

How do I decide between M3, M4, and M5 for my project?

Choose based on the load and the tapped hole size in your material. M3 is commonly used in electronics, RC components, and light fixtures. M4 suits small machinery and brackets. M5 is a versatile choice for general mechanical assemblies. When in doubt, select the largest diameter that fits your clearance hole without compromising the surrounding material.

Are these screws compatible with metric nuts and washers?

Yes. These socket head cap screws use standard ISO metric coarse threads and are generally compatible with DIN 934 hex nuts, DIN 125 flat washers, and other metric hardware of the same nominal diameter. Always confirm thread pitch when mixing hardware from different suppliers.

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