🌊 Product Overview: M3–M6 A4 Stainless Steel Bolt, Nut & Washer Set – Phillips Pan Head (316 Marine Grade)
Stop hunting for matching nuts and washers – this all‑in‑one set gives you everything you need. Each M3 to M6 Phillips pan head machine screw comes with a matching A4 (316) stainless steel hex nut and flat washer. Perfect for marine environments, coastal furniture, chemical plants, and outdoor DIY where standard steel would rust within months. The low‑profile pan head sits flush on surfaces, the Phillips drive makes installation easy, and the included nut and washer handle through‑hole assemblies. Made from 316 stainless steel (A4 grade), these fasteners offer exceptional corrosion resistance, high strength, and long‑term durability. Choose your size – we’ve got M3, M4, M5, and M6 covered.
✨ Why This A4 Stainless Steel Screw, Nut & Washer Kit Is a Marine Essential
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Complete 3‑piece set – screw + nut + flat washer – No separate purchases. Everything you need for through‑hole fastening in one bag. Saves time and ensures thread match.
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A4 (316) stainless steel – Marine grade with molybdenum. Excellent corrosion, oxidation, and heat resistance. High strength and high toughness. Perfect for saltwater and chemical exposure.
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Phillips pan head design – Rounded top with a flat bearing surface. Smooth, burr‑free finish. Distributes clamping force evenly and looks clean on finished work.
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Metric sizes M3, M4, M5, M6 – The most common diameters for furniture, marine hardware, electronics enclosures, and industrial equipment.
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Fully threaded, coarse metric pitch – M3x0.5, M4x0.7, M5x0.8, M6x1.0. Threads run the entire shank length for maximum grip.
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High‑quality workmanship – Neat, complete threads, uniform force, no stripping. Anti‑corrosion and rust resistance for long service life.
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Wide application – Industry, furniture decoration, marine, chemical equipment, and outdoor DIY.
📏 Technical Specifications – M3–M6 A4 Stainless Screw, Nut & Washer Set
| Specification |
Details |
| Product Type |
Phillips Pan Head Machine Screw + Hex Nut + Flat Washer (3‑piece set) |
| Material |
A4 Stainless Steel (316 / marine grade) |
| Grade |
A4 – superior corrosion & acid resistance |
| Drive Style |
Phillips cross‑head |
| Head Style |
Pan head (low‑profile rounded) |
| System of Measurement |
Metric |
| Screw Sizes (Diameter) |
M3, M4, M5, M6 |
| Thread Pitch (coarse) |
M3x0.5, M4x0.7, M5x0.8, M6x1.0 |
| Thread Type |
Fully threaded |
| Length Measurement |
Under head (screw length excludes pan head) – select from options |
| Included Components |
1 screw + 1 hex nut + 1 flat washer per set (quantity based on selection) |
| Finish |
Natural stainless steel (unplated, bright) |
❓ FAQs – A4 Stainless Steel Screw, Nut & Washer Set
🔸 What’s included in each set? Do I get nuts and washers with every screw?
Yes – each screw comes with one matching A4 stainless steel hex nut and one flat washer. For example, if you order 10 M5 screws, you’ll receive 10 screws + 10 nuts + 10 washers. Everything is matched by thread size.
🔸 What’s the difference between A4 (316) and A2 (304) stainless steel?
A4 (316) contains molybdenum, which dramatically improves resistance to saltwater, chlorides, and industrial chemicals. A2 (304) is fine for most indoor and general outdoor use, but A4 is the standard for marine, coastal, and chemical environments. This kit uses A4 – the best choice for harsh conditions.
🔸 How is screw length measured? Are these fully threaded?
Yes – all screws 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.
🔸 Will A4 stainless steel rust in saltwater?
A4 (316) stainless 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.
🔸 What Phillips screwdriver size works for M3 through M6?
M3: use PH1. M4: use PH1 or PH2. M5–M6: use PH2. Using the correct size prevents stripping and ensures even force.
🔸 Are these screws magnetic?
A4 stainless is generally non‑magnetic in its annealed state, but cold forming (like thread rolling) can make it slightly magnetic. A light magnetic response is normal and does not affect corrosion resistance.
