🌊 Product Overview: Phillips Pan Head Screws with Spring & Flat Washer – 316 Stainless Steel (M3–M5)
Tired of hunting for separate washers every time you grab a screw? This complete set gives you a Phillips pan head machine screw plus both a spring washer and a flat washer – all pre‑packaged together. Made from marine‑grade 316 stainless steel (A4), these fasteners offer superior corrosion resistance, even in saltwater and harsh chemical environments. The spring washer prevents loosening from vibration, while the flat washer protects your surface and distributes clamping load. Available in M3, M4, and M5 metric diameters, with lengths from 6mm to 30mm (measured under the head). Perfect for marine hardware, outdoor furniture, chemical equipment, and any project where rust is not an option.
✨ Why This 316 Stainless Steel Screw & Washer Set Is a Marine Essential
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Complete set – screw + spring washer + flat washer – No separate purchases. The spring washer resists vibration loosening; the flat washer protects surfaces and spreads load.
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316 stainless steel (A4 / marine grade) – Contains molybdenum for exceptional resistance to saltwater, chlorides, and industrial chemicals. Outperforms 304 in harsh environments.
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Phillips pan head design – Low‑profile rounded head with a flat bearing surface. Distributes clamping force evenly and gives a clean, professional finish.
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Metric sizes M3, M4, M5 – The most common diameters for marine hardware, furniture, electronics enclosures, and light machinery.
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Lengths from 6mm to 30mm (under head) – Short screws for thin panels, longer ones for through‑hole assemblies. Choose exactly what you need.
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Fully threaded, coarse metric pitch – M3x0.5, M4x0.7, M5x0.8. Threads run the entire shank length for maximum grip.
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GB/T standard, plastic packaging – Consistent quality and organized storage.
📏 Technical Specifications – Pan Head Screws with Washers (316 Stainless)
| Specification |
Details |
| Product Type |
Phillips Pan Head Machine Screw + Spring Washer + Flat Washer (pre‑packaged set) |
| Material |
316 Stainless Steel (A4 / marine grade) |
| Drive Style |
Phillips cross‑head |
| Head Style |
Pan head (round, low profile) |
| Washers Included |
One spring washer (anti‑vibration) + one flat washer (load distribution) per screw |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M3, M4, M5 |
| Thread Pitches (coarse) |
M3x0.5, M4x0.7, M5x0.8 |
| Thread Type |
Fully threaded |
| Length Range (under head) |
6mm – 30mm (select from options) |
| Length Measurement |
Under head – from flat bearing surface to tip (head not included) |
| Standard |
GB/T |
| Packing |
Plastic bag / plastic packaging |
❓ FAQs – 316 Stainless Screw & Washer Set
🔸 Why do I need both a spring washer and a flat washer?
The flat washer goes against the surface (wood, plastic, metal) and distributes clamping force, preventing damage and pull‑through. The spring washer sits between the flat washer and the screw head – its split design creates tension that resists loosening from vibration. Together, they give you a secure, long‑lasting fastening for marine equipment, outdoor furniture, and moving parts.
🔸 Will 316 stainless steel rust in saltwater?
316 stainless (A4) is highly resistant to saltwater corrosion and is the go‑to choice for boat hardware, dock fittings, and submerged applications. While no metal is completely immune to crevice corrosion in stagnant, low‑oxygen conditions, 316 performs excellently for most marine use. Rinse occasionally with fresh water for maximum lifespan.
🔸 Are these screws fully threaded? How is length measured?
Yes – they are fully threaded from just under the head to the tip. Length is measured from the underside of the head (the flat bearing surface) to the tip, not including the pan head. For example, an M5 x 20mm screw has a 20mm threaded shank below the head.
🔸 What Phillips screwdriver size works for M3, M4, and M5?
M3: use PH1. M4: use PH1 or PH2. M5: use PH2. Using the correct size prevents stripping. A quality PH2 bit will handle M4 and M5 comfortably.
🔸 Can I use these screws without the washers?
Yes – the spring and flat washers are separate pieces, not pre‑attached. You can choose to use all, some, or none of them. However, for best results against vibration and surface damage, we recommend using both as intended.
🔸 What lengths are available for M3, M4, and M5?
We offer lengths from 6mm to 30mm. Typical increments: 6, 8, 10, 12, 14, 16, 18, 20, 25, 30mm. Please select your desired length from the dropdown options. If you need a length not listed, contact us.
