Phillips Pan Head Machine Screws — A4 Marine Grade Stainless Steel, DIN 7985 (M1.6–M10)

A general rule: the screw length should be approximately 2–3× the thickness of the material being fastened. For example, joining two 5mm panels typically calls for a 10–12mm screw. Lengths in this listing range from 2mm (≈5/64") to 100mm (≈3-15/16"). When in doubt, size up and manage thread engagement with a washer.

A4 refers to AISI 316 stainless steel, which contains molybdenum for enhanced resistance to chloride corrosion. It is generally the preferred grade for saltwater, coastal, and chemical environments where standard A2 (304) stainless may corrode over time.

Yes. A4 (316) stainless steel is specifically formulated for marine and outdoor use. It typically outperforms A2 stainless in saltwater spray, humid coastal air, and chemical exposure. For fully submerged applications, confirm compatibility with your specific environment.

These screws conform to DIN 7985, the metric standard for Phillips pan head machine screws. Thread pitches follow ISO metric coarse standards: M1.6 at 0.35mm, M2 at 0.4mm, M2.5 at 0.45mm, M3 at 0.5mm, M4 at 0.7mm, M5 at 0.8mm, M6 at 1mm, M8 at 1.25mm, and M10 at 1.5mm.

These are Phillips (cross-head) drive screws. Use a PH0 bit for M1.6–M2, PH1 for M2.5–M3, and PH2 for M4–M10. Using the correct bit size reduces cam-out and protects the head recess.

A4-70 grade stainless screws generally have a minimum tensile strength of 700 MPa (≈101,500 psi). Actual load capacity depends on diameter, engagement length, and base material. For structural or load-bearing applications, consult an engineer.

Yes. DIN 7985 screws use standard ISO metric threads and are compatible with DIN 934 hex nuts, DIN 985 nyloc nuts, and most metric threaded inserts of the same diameter and pitch.