304 Stainless Steel Phillips Countersunk Screws M2–M8, 3–100mm

304 Stainless Steel Phillips Flat Countersunk Head Machine Screws

Get the perfect fastening solution for woodworking, electronics, metalwork, and general DIY projects. These A2-70 Grade 304 stainless steel Phillips flat countersunk head screws deliver a flush, clean finish every time. Available in a wide range of metric thread sizes from M2 to M8 and lengths from 3 mm to 100 mm, you can find the exact size for virtually any application. Packs of 10 or 50 pieces make it easy to stock your workshop or complete a single project without waste.

Made in Mainland China.

Key Features

• Premium 304 Stainless Steel – A2-70 grade construction resists rust and corrosion, ideal for indoor and outdoor use
• Flat Countersunk Head – Sits completely flush with the surface for a neat, professional finish
• Phillips (Cross) Drive – Compatible with standard Phillips screwdrivers and power driver bits for fast, easy installation
• Wide Size Range – Available in M2, M2.5, M3, M3.5, M4, M5, M6, and M8 thread diameters
• Versatile Lengths – Choose from 3 mm up to 100 mm total length to suit any project depth
• CE Certified – Meets quality and safety standards for reliable performance
• GB819 Standard – Manufactured to the GB819 metric machine screw specification for precise fitment
• Value Pack Options – Available in 10-piece or 50-piece packs to suit your project needs

Specifications

Common Applications

• Woodworking and furniture assembly
• Electronics enclosures and circuit board mounting
• Metal fabrication and sheet metal work
• Automotive and marine fittings
• General home improvement and repair

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What is the difference between M3 and M4 Phillips countersunk screws?

A: The M3 screw has a 3 mm thread diameter with a 0.5 mm pitch, while the M4 has a 4 mm thread diameter and a 0.7 mm pitch. M4 screws are larger and stronger, suited for heavier-duty applications, whereas M3 is commonly used in electronics and lightweight assemblies. Both are available in flat countersunk Phillips drive in this 304 stainless steel set.

Q: Are these 304 stainless steel screws suitable for outdoor use?

A: Yes. 304 stainless steel (A2-70 grade) offers excellent corrosion and rust resistance, making these Phillips flat countersunk head screws suitable for most outdoor, marine, and humid environments where standard steel fasteners would corrode over time.

Q: What screwdriver or bit do I need for these Phillips flat countersunk head screws?

A: These screws use a standard Phillips (cross) drive. Select the appropriate Phillips bit size to match the screw diameter: PH0 for M2–M2.5, PH1 for M3–M3.5, and PH2 for M4–M8. They are compatible with both manual screwdrivers and power driver tools.

Q: How do I choose the right screw length for my project?

A: A good general rule is to choose a screw length that will penetrate the receiving material by at least 2–3 times the screw's thread diameter. For example, an M4 screw should ideally go at least 8–12 mm into the base material. With lengths available from 3 mm to 100 mm, there is an option for nearly every application.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.