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Sourcing corrosion-resistant machine screws that hold up in salt air, wet environments, and coastal conditions is a persistent challenge for boat builders, marine fabricators, outdoor furniture makers, and DIYers working near water. Standard 304 stainless screws corrode faster than expected in chloride-rich environments, and finding the right size in genuine G316 marine stainless often means waiting on specialty orders. These G316 marine stainless steel pan head Phillips machine screws are available in M3, M4, M5, M6, and M8 thread diameters, covering the most common metric sizes for marine and outdoor fastening in a single listing.
Each screw features a pan head profile with a slightly domed top and a wide, flat bearing surface, providing a secure grip on the material without requiring a countersink. The Phillips (cross-head) drive is compatible with standard PH1 and PH2 screwdrivers and power drivers. Thread sizes follow the ISO metric coarse standard — M3 (0.5mm pitch) through M8 (1.25mm pitch) — with shank lengths ranging from 6mm (≈1/4") to 50mm (≈2") depending on the thread size selected. Pack quantities range from 1 piece up to 500 pieces per order, making this listing suitable for both one-off repairs and production runs.
Typical applications include marine hardware assembly and boat fittings where G316 stainless steel corrosion resistance is required in salt water environments, outdoor furniture, deck fittings, and coastal construction projects where standard stainless screws corrode prematurely, and general fabrication, enclosure assembly, and light machinery where a pan head Phillips machine screw in a corrosion-resistant alloy is needed.
| Material | G316 Stainless Steel (A4 / 316 Grade, Molybdenum-bearing) |
|---|---|
| Thread Standard | ISO Metric Coarse Thread |
| Available Thread Sizes | M3, M4, M5, M6, M8 |
| Thread Pitch | M3: 0.5mm | M4: 0.7mm | M5: 0.8mm | M6: 1.0mm | M8: 1.25mm |
| Screw Length Range | 6mm (≈1/4") – 50mm (≈2") (varies by thread size — see variant options) |
| Head Type | Pan Head (domed top, flat bearing surface) |
| Drive Type | Phillips (cross-head) — PH1 for M3–M4, PH2 for M5–M8 (typically) |
| Property Class | Typically A4-70 — Contact us to confirm |
| Tensile Strength | Typically ≥700 MPa (A4-70) — Contact us to confirm |
| Pack Quantities | 1, 2, 3, 5, 10, 20, 25, 30, 40, 50, 60, 80, 100, 200, 300, 500 pieces |
| Corrosion Resistance | Excellent — suitable for marine, coastal, and outdoor use |
The listed length for pan head screws is the shank length excluding the head. A general rule is to engage at least 1.5× the screw diameter into the receiving material. For example, an M5 screw should typically thread at least 7.5mm into the tapped hole or nut. Available lengths range from 6mm (≈1/4") to 50mm (≈2") depending on thread size — select based on your material stack-up and required thread engagement.
G316 (A4) stainless steel machine screws are generally rated to property class A4-70, with a minimum tensile strength of approximately 700 MPa. For safety-critical or structural applications, please contact us to confirm the exact property class before ordering.
Yes. G316 (A4) stainless steel contains molybdenum, which significantly improves resistance to chlorides, salt spray, and acidic environments compared to standard 304 (A2) stainless. These screws are well-suited for marine hardware, coastal construction, outdoor furniture, and other applications where exposure to moisture and salt is expected.
These screws follow the ISO metric coarse thread standard. Thread pitches are: M3 — 0.5mm, M4 — 0.7mm, M5 — 0.8mm, M6 — 1.0mm, M8 — 1.25mm. They are compatible with standard ISO metric hex nuts, nylon lock nuts, threaded inserts, and tapped holes. Always verify thread pitch and size compatibility before assembly.
G304 (A2) stainless steel is suitable for general indoor and mild outdoor use and is the most widely used stainless steel grade for fasteners. G316 (A4) adds molybdenum, providing significantly better resistance to chlorides, salt spray, and acidic environments. For marine, coastal, or chemical exposure applications, G316 is the recommended choice. For most indoor and general-purpose applications, G304 is sufficient and more cost-effective.
These screws use a Phillips (cross-head) drive. Use a correctly sized Phillips screwdriver: PH1 is typically appropriate for M3–M4, and PH2 for M5–M8. Using the correct size minimizes cam-out risk and prevents head damage. Apply steady axial pressure during installation, especially on smaller sizes.
Yes. These screws follow the ISO metric coarse thread standard and are compatible with standard ISO metric hex nuts, nylon lock nuts, flange nuts, and threaded inserts. Always verify thread pitch and size compatibility before assembly.
Pack quantities range from 1 to 500 pieces depending on the size selected. For a single repair or prototype, a small pack (1–5 pcs) is typically sufficient. For production, maintenance, or workshop stock, larger packs (50–500 pcs) offer better per-unit value. Contact us if you need quantities beyond what is listed.
