100-pack M4 x 20mm Button Torx Head Self Tapping Screws for Wood, 304 Stainless Steel 18-8, Full Thread, Torx Drive Head Sheet Metal Tek Screws, T20 Bit Included

• Thread Size: 4mm; Thread Length: 20mm; Torx Drive Size: T20 (bit included)
• Head Diameter: 7.2mm-7.6mm; Head Height: 1.9mm-2.2mm
• Material: 304 stainless steel (A2) and no exterior finish, greater strength and corrosion resistance performance than regular stainless steel or zinc plated fasteners; can withstand harsh weather, moisture, and chemicals, ideal for outdoor, marine, or industrial environments
• Key features: 1) High torque resistance, the torx drive design provide superior torque transfer; 2) Self tapping efficiency; 3)Wide material compatibility, suitable for a variety of materials, like sheet metal, plastic, and composite boards
• Wide Applications: automotive assembly; electronics enclosures; DIY furniture projects; outdoor equipments; HVAC systems; roofing projects; Their self-tapping tip eliminates pre-drilling, saving time on jobsites or DIY renovations

Material Advantage Engineered from premium 304 stainless steel (A2/18-8 grade), these fasteners feature a chromium-nickel alloy composition that delivers superior corrosion resistance and mechanical strength compared to standard stainless grades or zinc-plated alternatives. The material's inherent 18% chromium and 8% nickel content forms a passive oxide layer, eliminating the need for secondary coatings while providing exceptional protection against salt spray, chemical exposure, and atmospheric corrosion. This marine-grade stainless construction ensures reliable performance in demanding environments, including coastal installations, industrial facilities, and outdoor applications where moisture resistance and structural integrity are critical.