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When you're assembling equipment in wet environments, mounting panels on marine hardware, or fastening components where a loose washer would be a liability, a standard pan head screw often falls short. These 316 stainless steel Phillips flanged pan head machine screws solve that problem by integrating a wide-bearing flange directly into the head — giving engineers, fabricators, and serious DIYers a cleaner, more reliable fastening solution right out of the box.
Each screw is machined from 316 stainless steel and features a Phillips (cross-head) drive with a flanged pan head. The built-in flange diameter ranges from 7.0mm (M3 sizes) to 12mm (M6 sizes), providing a broad load-bearing surface without requiring a separate flat washer. Thread diameters span M3 through M6, with lengths available from 4mm (≈5/32") to 50mm (≈2"), covering a wide range of stack-up thicknesses. Quantities are available from single pieces up to 500-packs to suit both one-off repairs and production runs.
These flanged pan head screws are well suited for electronics enclosure assembly, marine hardware mounting, HVAC bracket fastening, and food-grade equipment fabrication — anywhere ISO metric coarse thread fasteners with corrosion resistance are required. The low-profile pan head keeps clearance tight while the flange prevents pull-through in softer substrates.
| Material | 316 Stainless Steel (18-10-2 Mo) |
|---|---|
| Drive Type | Phillips (Cross-head) — PH1 for M3–M4, PH2 for M5–M6 |
| Head Style | Flanged Pan Head |
| Thread Standard | ISO Metric Coarse (DIN 7985 / similar) |
| Thread Diameter | M3, M4, M5, M6 |
| Thread Length (Screw Length) | 4mm (≈5/32") to 50mm (≈2") — see variant options |
| Flange Outer Diameter | 7.0mm (M3) · 8.0mm (M4) · 11mm (M5) · 12mm (M6) |
| Finish | Natural (mill finish) stainless — no coating |
| Corrosion Resistance | Suitable for marine and salt-spray environments |
| Tensile Strength | Typically 500–700 MPa (contact us to confirm for specific size) |
| Quantity Options | 1 / 5 / 10 / 50 / 100 / 500 pcs per order |
| Country of Origin | See variant options |
| Certifications / Compliance | Contact us to confirm |
Generally, the screw length should equal the thickness of the material being fastened plus enough thread engagement in the receiving material — typically 1.5× the screw diameter. For example, an M4 screw generally needs at least 6mm of thread engagement. Available lengths here range from 4mm to 50mm (approx. 5/32" to 2"), so measure your stack-up before selecting. When in doubt, go slightly longer and use a nut or threaded insert rather than risk insufficient engagement.
The integrated flange acts like a built-in washer, distributing the clamping load over a wider surface area. This reduces the risk of the screw head pulling through softer materials — such as aluminum sheet, plastic panels, or thin composites — and eliminates the need for a separate flat washer in most applications, saving assembly time and reducing part count.
Yes. 316 stainless steel contains molybdenum (typically ~2%), which provides significantly better resistance to chloride corrosion compared to 304 stainless. It is generally considered suitable for coastal, marine, and other high-humidity or salt-spray environments. For fully submerged or highly aggressive chemical environments, contact us to confirm suitability for your specific application.
These screws follow the ISO metric coarse thread standard (M3, M4, M5, M6). They are compatible with standard metric nuts (DIN 934), nylon lock nuts, threaded inserts, and tapped holes machined to ISO metric specifications. They are not compatible with UNC/UNF inch-thread hardware.
For M3 and M4 sizes, a PH1 (Phillips #1) bit is typically the correct fit. For M5 and M6 sizes, a PH2 (Phillips #2) bit is generally recommended. Always use a properly sized, well-fitting bit to avoid cam-out and head damage — especially important in stainless steel, which can gall if over-torqued with a slipping driver.
316 stainless steel machine screws typically have a tensile strength in the range of 500–700 MPa depending on the manufacturing process and heat treatment. Shear and pull-out strength will vary based on thread engagement depth and the material being fastened into. For precise load ratings in structural or safety-critical applications, please contact us to confirm specifications for your specific size and quantity.
316 stainless steel is commonly used in food-grade and pharmaceutical equipment due to its corrosion resistance and ease of cleaning. However, compliance with specific food safety or medical device standards (such as FDA, NSF, or ISO 13485) depends on the full assembly and application context. Contact us to confirm if material certifications or traceability documentation are required for your project.
