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When a protruding screw head isn't an option — whether you're fitting panels, assembling cabinetry, or mounting electrical enclosures — you need a countersunk screw that sits perfectly flush and won't corrode over time. These A2 stainless steel Pozi countersunk machine screws are built for exactly that: a clean, flat finish combined with the rust resistance that stainless steel is known for, in a Pozidrive format that reduces cam-out and driver slippage during installation.
Each box contains machine screws with a flat (countersunk) head and Pozidrive recess, made from A2 (304) stainless steel for corrosion resistance in both indoor and outdoor environments. Available in thread diameters M3 (3mm), M4 (4mm), M5 (5mm), and M6 (6mm), with bolt lengths from 5mm (≈3/16") to 50mm (≈2"), sold in boxes of 50 or 100 pieces depending on the size selected.
These stainless steel countersunk machine screws are well-suited for furniture and cabinetry assembly where a flush surface is required, panel and bracket mounting in electronics or electrical enclosures, and general-purpose metric fastening in workshops, marine environments, and outdoor structures where corrosion resistance matters.
| Thread Standard | ISO Metric Coarse (DIN 965 / equivalent) |
|---|---|
| Thread Diameters | M3, M4, M5, M6 |
| Bolt Lengths Available | 5mm (≈3/16") – 50mm (≈2") |
| Head Type | Countersunk (Flat Head) |
| Head Angle | Typically 90° — contact us to confirm for your size |
| Drive Type | Pozidrive (Pozi / PZ) |
| Material | A2 Stainless Steel (304 / 18-8) |
| Finish | Natural stainless (no coating) |
| Pack Quantities | 50 or 100 pieces per box (see variant options) |
| Corrosion Resistance | Good — suitable for outdoor and light marine use |
| Thread Type | Machine thread (not self-tapping) |
| Country of Origin | Contact us to confirm |
For countersunk screws, the bolt length is measured from the top of the head (which sits flush with the surface) to the tip. As a general rule, select a length equal to the thickness of the material being fastened plus enough thread engagement in the receiving material — typically at least 1.5× the thread diameter. For example, fastening a 6mm panel into a tapped hole: a 12mm or 16mm screw is generally appropriate. In inches: 10mm ≈ 3/8", 20mm ≈ 3/4", 30mm ≈ 1-3/16", 50mm ≈ 2".
A2 stainless steel (also known as 304 or 18-8 stainless) is an austenitic grade that offers good corrosion resistance and moderate tensile strength — generally around 500–700 MPa depending on size and property class. For heavy structural or high-load applications, A4 (316) or higher-grade fasteners are typically recommended.
Yes. A2 stainless steel provides good resistance to rust and atmospheric corrosion, making it suitable for most outdoor applications and light marine environments. For prolonged saltwater or coastal exposure, A4 (316) stainless steel is generally recommended for superior chloride resistance.
These screws use the ISO metric coarse thread standard (M3, M4, M5, M6). They are compatible with standard metric nuts, threaded inserts, and tapped holes per ISO 68-1. They are not compatible with UNC or UNF inch-thread fasteners.
Pozidrive (Pozi) is an improved version of the Phillips drive. It features additional ribs between the cross slots that provide better driver engagement, significantly reducing cam-out (slipping) under high torque. A Pozi (PZ) driver is required for these screws — while a Phillips driver may partially fit, it will not seat correctly and is likely to slip and damage the head, especially when driving into harder materials.
A countersunk (flat head) screw is designed to sit flush with or below the surface of the material when driven into a countersunk hole. Use countersunk screws when a protruding head would interfere with adjacent parts, create a snag hazard, or affect the finished appearance — such as in furniture assembly, panel mounting, cabinetry, and electrical enclosures. Pan head screws are generally used where a countersunk hole is not practical or where the head needs to bear against a flat surface.
Yes. To achieve a flush finish, you'll need a countersink drill bit that matches the head angle of the screw — typically 90° for metric machine screws. The countersink diameter should match the head diameter of the screw size you're using. Pre-drilling a pilot hole before countersinking is generally recommended to prevent material splitting and ensure accurate positioning.
