A2 Stainless Steel Hex Socket Countersunk Screws — Flush-Fit Precision for Every Build
When a protruding bolt head isn't an option, you need a fastener that disappears into the surface. Whether you're assembling electronics enclosures, furniture frames, machinery panels, or precision fixtures, exposed screw heads create snag points, clearance issues, and an unfinished look. These A2 stainless steel hex socket countersunk flat head screws are built for builders, makers, and engineers who demand a clean, flush result every time.
Each pack contains 10 precision-machined screws in A2 (304) stainless steel with a fully threaded countersunk body and internal hex (Allen) drive socket. Available in thread diameters from M1.6 to M16 and lengths from 3mm to 150mm (approximately 0.12" to 5.91"), these screws cover the full range of metric fastening needs — from micro-electronics to structural assemblies.
Typical use cases include mounting PCB boards and electronics housings (M1.6–M3), securing aluminum extrusion panels and machine guards (M4–M6), assembling furniture and cabinetry with flush hardware (M5–M8), and bolting structural brackets and load-bearing fixtures (M8–M16) where a low-profile head is required.
🔩 Compatible with standard ISO metric tapped holes, hex nuts, and threaded inserts. Requires a metric hex key (Allen wrench) for installation.
✅ Key Features of These A2 Stainless Hex Socket Countersunk Screws
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🛡️ A2 Stainless Steel Construction — Chromium-nickel alloy provides strong resistance to rust, oxidation, and corrosion in indoor and moderate outdoor environments.
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🔧 Hex (Allen) Socket Drive — Internal hex socket allows high torque application with minimal cam-out risk, ideal for tight spaces and power tool use.
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📐 Countersunk Flat Head Profile — 90° countersunk head sits flush with or below the surface for a clean, snag-free finish on panels, frames, and enclosures.
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🔗 Deep, Uniform Thread Pitch — ISO metric coarse threads with consistent pitch and clear texture deliver high bite strength and a secure, vibration-resistant connection.
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📦 Wide Size Range — M1.6 to M16 — One product family covers micro-fastening through heavy structural applications, reducing the number of suppliers you need.
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⚙️ Fully Threaded Shank — Full thread engagement from head to tip maximizes clamping force and pull-out resistance across the entire length range.
📐 Technical Specifications — A2 Stainless Hex Socket Countersunk Screws
| Material |
A2 Stainless Steel (304 equivalent) |
| Head Type |
Countersunk Flat Head |
| Drive Style |
Hex Socket (Allen Key / Internal Hex) |
| Thread Standard |
ISO Metric Coarse Thread |
| Thread Diameter Range |
M1.6 / M2 / M2.5 / M3 / M4 / M5 / M6 / M8 / M10 / M12 / M16 |
| Length Range |
3mm – 150mm (approx. 0.12" – 5.91") |
| Head Angle |
90° Countersunk |
| Finish |
Natural Stainless Steel |
| Strength Grade |
A2-70 (stainless property class) |
| Package Quantity |
10 PCS per pack |
| System of Measurement |
Metric |
| Compatible Tools |
Metric Hex Key / Allen Wrench (size varies by diameter) |
❓ Frequently Asked Questions
How do I choose the right screw size?
Match the thread diameter (M1.6–M16) to your tapped hole or nut size, and choose a length that allows full thread engagement — typically 1.5× the thread diameter minimum. For blind holes, ensure the screw length does not exceed the hole depth.
Are these screws corrosion-resistant?
Yes. A2 stainless steel contains chromium and nickel, providing strong resistance to rust, oxidation, and moisture in most indoor and outdoor environments. For highly corrosive or marine environments, A4 (316) stainless is generally recommended.
What tool do I need to drive these screws?
These screws use a hex (Allen) socket drive. You will need a metric hex key or Allen wrench matching the socket size for your chosen thread diameter. Common sizes: M3 uses 2mm hex, M4 uses 3mm hex, M5 uses 4mm hex, M6 uses 5mm hex.
Can these be used in outdoor or wet environments?
A2 stainless steel is generally suitable for outdoor use and moderate moisture exposure. For highly corrosive, saltwater, or chemical environments, A4 (316) stainless is typically the better choice.
What is the thread pitch for these screws?
These screws follow standard ISO metric coarse thread pitch. For example, M3 is typically 0.5mm pitch, M4 is 0.7mm, M5 is 0.8mm, M6 is 1.0mm, M8 is 1.25mm, and M10 is 1.5mm.
Will the head sit flush when installed?
Yes. The countersunk (flat) head is designed to sit flush with or below the surface when installed in a properly countersunk hole. Ensure your workpiece is countersunk at 90° to match the head angle for a clean flush fit.
What strength grade are these screws?
These screws are A2 stainless steel, which is generally equivalent to property class A2-70 for stainless fasteners — suitable for most general-purpose mechanical, structural, and precision assembly applications.
How many screws are included per order?
Each listing includes 10 PCS per pack. Select your required thread diameter and length from the variant options above before adding to cart.
🛒 Select your Size (Thread Diameter) and Length above, then add to cart.
