304 SS Truss Head Self-Tapping Screws M3–M6 | 6–100mm

304 Stainless Steel Truss Head Self-Tapping Screws — M3, M4, M5 & M6

Built for durability and a clean finish, these large flat (truss/mushroom) head, cross-drive self-tapping screws are machined from 304/316 stainless steel for outstanding corrosion resistance and long-lasting strength. The wide, low-profile truss head spreads clamping load over a larger surface area, making these screws ideal for thin materials, plastics, sheet metal, wood, and light fabrication work. Available in M3, M4, M5, and M6 diameters with lengths ranging from 6 mm to 100 mm, you'll find exactly the right size for your project.

Made in Mainland China.

Key Features

• Material: 304 / 316 Stainless Steel — rust-resistant and suitable for indoor and outdoor use
• Head Style: Large flat truss (mushroom) head with Phillips (cross) drive
• Thread Type: Self-tapping — cuts its own thread for fast, secure fastening without a pre-tapped hole
• Size Range: M3, M4, M5, M6 diameters; lengths from 6 mm to 100 mm
• Standard: GB (Guobiao) — consistent, precise dimensions across every piece
• Wide clamping surface distributes load evenly, reducing pull-through in softer materials
• Bright, smooth finish for a professional look on visible surfaces

Ideal Applications

• Sheet metal fabrication and enclosures
• Plastic panels, electronics housings, and cabinetry
• DIY home improvement, electrical installations, and general hardware
• Outdoor fixtures, signage, and marine-adjacent environments
• Woodworking and light structural assembly

Specifications

Related Products You May Need

• 10PCS Stainless Steel Self-Tapping Screws M2.2–M4.8 Phillips
• 10pcs Durable Gold Blade Nut Metal Universal Trimmer Accessories Anti-Loosening Line Left Hand Thread Replacement Parts
• 12pcs 16mm Momentary Push Button Switch 1NO Metal 2-Pin Self-Reset

Learn more: OSHA on eye and face protection

Frequently Asked Questions

Q: What is the difference between a truss head and a standard pan head self-tapping screw?

A: A truss head (also called a mushroom or large flat head) has a wider, lower-profile dome than a standard pan head. This wider bearing surface distributes clamping force over a greater area, making it ideal for thin sheet metal, plastics, or soft materials where a smaller head might pull through.

Q: Are these screws suitable for outdoor or humid environments?

A: Yes. Made from 304/316 stainless steel, these screws offer excellent corrosion and rust resistance, making them well-suited for outdoor fixtures, damp environments, and marine-adjacent applications.

Q: Do I need to pre-drill a hole before using these self-tapping screws?

A: For harder materials such as thick sheet metal, a small pilot hole is recommended to guide the screw and prevent material distortion. For softer materials like wood, thin plastic, or light-gauge metal, the sharp self-tapping thread can drive directly without pre-drilling.

Q: What sizes are available, and how do I choose the right one?

A: These screws are available in M3, M4, M5, and M6 diameters with lengths ranging from 6 mm to 100 mm. As a general rule, choose a diameter that matches your existing hardware or pilot hole size, and select a length approximately 2–3 times the thickness of the material being fastened for a secure hold.

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.