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One corroded fastener can compromise an entire marine assembly. If you're building or repairing anything exposed to saltwater, coastal air, or industrial chemicals, standard 304 stainless simply isn't enough. These A4 (316) stainless steel Phillips countersunk screws are engineered for the harshest conditions — the added molybdenum content delivers superior chloride resistance that outlasts A2 in every marine and coastal application.
Manufactured to DIN 965 specifications, each screw features a 90° countersunk flat head with a Phillips (cross-head) drive, fully threaded from just below the head to the tip. Available in diameters from M2 to M8 and lengths from 3 mm to 100 mm (approx. 0.12"–3.94") — length measured including the head, as standard for countersunk fasteners. Thread pitches follow metric coarse standards: M2 × 0.4 mm, M2.5 × 0.45 mm, M3 × 0.5 mm, M4 × 0.7 mm, M5 × 0.8 mm, M6 × 1.0 mm, M8 × 1.25 mm.
Whether you're assembling boat decking, dock hardware, coastal furniture, communication equipment, or industrial panels, these M2–M8 A4 countersunk screws deliver a flush, snag-free finish and the corrosion resistance your project demands.
Secure decking, hull panels, fittings, and dock hardware with A4 (316) screws that resist saltwater corrosion season after season.
Fasten panels, guards, and equipment in high-chloride or chemical environments where standard stainless would corrode prematurely.
Install coastal furniture, outdoor signage, and architectural hardware with fasteners that hold up to salt air and humidity without staining or rusting.
Use M2–M3 sizes for communication equipment, instruments, and enclosures where a flush, non-magnetic, corrosion-resistant fastener is required.
| Standard | DIN 965 |
|---|---|
| Material | A4 Stainless Steel (316 / Marine Grade) |
| Head Style | Countersunk (Flat) Head, 90° |
| Drive Style | Phillips (Cross-Head) |
| Thread Sizes | M2 / M2.5 / M3 / M4 / M5 / M6 / M8 |
| Thread Pitch (Coarse) | M2×0.4 | M2.5×0.45 | M3×0.5 | M4×0.7 | M5×0.8 | M6×1.0 | M8×1.25 |
| Thread Type | Fully Threaded |
| Length Range | 3 mm – 100 mm (approx. 0.12"–3.94") — length includes the head |
| Finish | Natural Stainless (Bright, Unplated) |
| Pack Quantities | 1 Pcs / 5 Pcs / 20 Pcs / 50 Pcs (select above) |
A4 (316) contains molybdenum, which significantly improves resistance to chlorides — including saltwater, de-icing salts, and industrial chemicals. A2 (304) is suitable for most indoor and general outdoor use, but A4 is the standard choice for marine, coastal, and chemical environments where chloride exposure is a concern.
For countersunk screws, length is measured as the total screw length including the head — from the top of the flat head to the tip. This is the DIN 965 standard. For example, an M5 × 20 mm screw is 20 mm overall from head top to tip.
Yes. These screws are fully threaded from just below the head to the tip, providing maximum thread engagement in tapped holes or with matching metric nuts.
A4 (316) stainless is highly resistant to saltwater corrosion and is the standard choice for marine hardware. While no metal is completely immune to crevice corrosion in stagnant, low-oxygen conditions, 316 performs excellently for most marine and coastal applications. Rinsing occasionally with fresh water helps maximize service life.
Typically: M2–M2.5 use PH0 or PH00; M3–M4 use PH1; M5–M6 use PH2; M8 use PH2 or PH3. Using the correct size prevents cam-out and stripping.
Yes. These are standard metric machine screws that require a matching metric nut (M2–M8) or a pre-tapped hole. They are not self-tapping. For best corrosion resistance, pair with A4 (316) stainless nuts.
A4 (316) stainless is generally non-magnetic in its annealed state. Cold forming during thread rolling can introduce a slight magnetic response, which is normal and does not affect corrosion resistance or performance.
