M1.6–M8 A2 Stainless Steel Flat Countersunk Slotted Machine Screws — Flush-Fit Precision for Every Project
When a protruding fastener head isn't an option — in electronics enclosures, furniture panels, or precision metalwork — you need a screw that disappears into the surface. These A2 (304) stainless steel flat head slotted machine screws deliver a clean, flush countersunk finish across a wide range of metric sizes, making them the go-to choice for engineers, makers, and serious DIYers who won't compromise on fit or finish.
Each screw is machined from A2 grade 304 stainless steel with a natural stainless finish. Available in diameters from M1.6 to M8 and lengths from 4mm to 60mm (approximately 0.16" to 2.36"), these screws cover the full spectrum of light-duty to medium-duty metric fastening needs. The flat countersunk head profile conforms to standard metric DIN 963 / ISO 2009 geometry.
Typical use cases include PCB and electronics chassis assembly (M1.6–M3), woodworking joinery and cabinet hardware (M3–M6), machinery and equipment panels (M4–M8), and general DIY repairs where a flush surface is required. The slotted drive works with any standard flat-blade screwdriver, making installation straightforward without specialized tooling.
🔩 Compatibility: ISO metric thread standard — fits standard metric hex nuts, threaded inserts, and tapped holes of corresponding size (M1.6–M8).
✅ Key Features of These A2 Stainless Steel Flat Head Slotted Machine Screws
- A2 (304) Stainless Steel: Corrosion-resistant alloy resists rust, oxidation, and mild chemical exposure — suitable for indoor and outdoor environments.
- Flat Countersunk Head: Sits flush with or below the surface for a clean, snag-free finish on panels, wood, and metal.
- Slotted Drive: Compatible with any standard flat-blade screwdriver — no specialty bits required.
- Wide Size Range: Diameters M1.6 through M8, lengths 4mm–60mm (≈0.16"–2.36") — one listing covers dozens of fastening scenarios.
- ISO Metric Thread: Conforms to standard metric thread pitch for reliable compatibility with nuts, inserts, and tapped holes.
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Flexible Quantity: Available as 1 PCS (sample/replacement) or 10 PCS (project pack) — select your quantity above.
📐 Technical Specifications — A2 Stainless Steel Flat Head Slotted Machine Screws
| Material |
A2 Grade 304 Stainless Steel |
| Finish |
Natural Stainless (mill finish) |
| Head Style |
Flat Countersunk |
| Drive Type |
Slotted (flat-blade) |
| Thread Standard |
ISO Metric (DIN 963 / ISO 2009) |
| Available Diameters |
M1.6, M2, M2.5, M3, M4, M5, M6, M8 |
| Available Lengths |
4mm–60mm (≈0.16"–2.36") — varies by diameter |
| System of Measurement |
Metric |
| Pack Options |
1 PCS / 10 PCS |
| Corrosion Resistance |
Good — suitable for general outdoor and humid environments |
| Typical Applications |
Electronics, woodworking, metalworking, machinery, DIY repairs |
❓ Frequently Asked Questions
What sizes are available?
Diameters M1.6, M2, M2.5, M3, M4, M5, M6, and M8 are available. Lengths typically range from 4mm to 60mm depending on the diameter selected — use the variant selector above to find your exact size.
What material are these screws made from?
A2 grade 304 stainless steel — a widely used austenitic alloy that offers good corrosion resistance, strength, and a clean appearance.
Are these suitable for outdoor use?
Generally yes. A2 (304) stainless steel resists rust and oxidation well in most outdoor and humid conditions. For highly corrosive or marine environments, A4 (316) grade is typically recommended.
What screwdriver do I need?
A standard flat-blade (slotted) screwdriver. Choose a blade width that fits snugly in the slot of your selected screw size to avoid cam-out and head damage.
How do I choose the right length?
A general rule is to select a length at least 1.5× the thickness of the material being fastened, ensuring adequate thread engagement. For tapped holes, the engaged thread length should typically be at least 1× the screw diameter.
Are these compatible with standard metric nuts?
Yes. These screws follow ISO metric thread standards and are generally compatible with standard metric hex nuts, wing nuts, and threaded inserts of the corresponding size.
Can I buy a single screw?
Yes — select "1 PCS" from the Pack Quantity option for a single-unit purchase. The "10 PCS" option offers better per-unit value for project quantities.
What is the head angle of the countersunk profile?
Flat countersunk machine screws to DIN 963 / ISO 2009 standard typically have a 90° countersunk head angle. Verify your countersink tool matches this angle for a flush fit.
What applications are these best suited for?
Common uses include PCB and electronics chassis assembly (smaller sizes), woodworking and cabinet hardware, machinery panels, furniture assembly, and general DIY repairs where a flush-mount fastener is required.
🛒 Select your Diameter × Length and Pack Quantity above, then add to cart.
