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When a project calls for a clean, low-profile fastener that won't rust out after a season outdoors, most hardware-store bins fall short — wrong size, unknown grade, or plain carbon steel dressed up with a thin zinc coat. These slotted round head machine screws are made from A2 stainless steel and cover the sizes that makers, repair technicians, and workshop professionals reach for most: M2 through M6 in thread diameter, with lengths from 3mm (≈1/8") to 40mm (≈1-9/16").
Each screw features a domed round head with a straight slot drive, conforming to the DIN 85 profile. The metric coarse thread (ISO 68-1) is compatible with standard metric nuts, washers, and tapped holes. Available in packs of 1, 5, 10, or 50 pieces — order a single screw for a repair or stock up with a 50-pack for ongoing workshop use.
Typical applications include electronics enclosures and instrument panels where a flush-friendly round head is preferred, light machinery and appliance assembly requiring corrosion-resistant metric fasteners, and hobby or RC builds where small-diameter slotted round head screws M2–M3 are standard. They also work well in furniture hardware, cabinetry fittings, and general DIY metalwork where a stainless machine screw with a clean head profile is needed.
| Product Type | Slotted Round Head Machine Screw |
|---|---|
| Head Style | Round (domed), DIN 85 profile |
| Drive Type | Straight slot (flat-head) |
| Material | A2 Stainless Steel (304 grade) |
| Thread Standard | Metric coarse, ISO 68-1 / DIN 13 |
| Thread Diameter | M2, M2.5, M3, M4, M5, M6 |
| Thread Length | 3mm (≈1/8") – 40mm (≈1-9/16"); see variant options |
| Pack Quantity | 1, 5, 10, or 50 pieces (select above) |
| Finish | Natural stainless (no coating) |
| Corrosion Resistance | Good — suitable for indoor and outdoor use; contact us to confirm for marine/chemical environments |
| Tensile Strength (typical) | ~700 MPa (ISO 3506 property class 70) |
| Country of Origin | See variant options |
| SKU Format | GYWHLBRMSD[size code]x[qty] |
Match the thread diameter to your tapped hole or nut size — an M3 screw goes into an M3 nut or M3-tapped hole. For length, measure the thickness of the material you're fastening through, then add typically 1–1.5× the thread diameter for adequate thread engagement in the receiving part. For example, an M3 screw through 4mm of material generally needs at least 8mm total length. Lengths in this listing range from 3mm (≈1/8") to 40mm (≈1-9/16").
A2 stainless steel (ISO 3506 property class 70) typically has a tensile strength of around 700 MPa. Actual load capacity depends on thread diameter, engagement depth, and the material being fastened. For structural or safety-critical applications, consult an engineer and confirm the specific grade with us before ordering.
A2 stainless steel generally performs well in outdoor and humid conditions, offering good resistance to rust and oxidation without surface coatings. For harsh marine, saltwater, or chemical environments, A4 (316) stainless steel is typically recommended. Contact us to confirm suitability for your specific use case.
Yes. These screws use metric coarse thread per ISO 68-1 / DIN 13, and the round head profile conforms to DIN 85. They are compatible with standard metric nuts, flat washers, spring washers, and tapped holes of the corresponding size (M2 through M6).
These screws use a straight slot (flat-head) drive. For M2–M3, a small precision flat-head screwdriver is typically needed; for M4–M6, a standard flat-head screwdriver works well. Power drivers can be used at low torque settings, but high-speed driving risks cam-out and head damage — hand driving is generally recommended for smaller sizes.
These are machine screws designed for use with a pre-tapped hole, threaded insert, or nut — not for self-tapping. They work well in aluminum, brass, steel, and hard plastics with the correct tapped hole or insert. For wood applications, a threaded insert (e.g., heat-set or press-fit) is generally recommended to provide a proper thread for the screw to engage.
Each variant is sold in packs of 1, 5, 10, or 50 pieces — select your preferred quantity from the options above. Each order line is for a single size and length combination. To order multiple sizes, simply add each variant to your cart separately.
