S-91801A224 M4 x 20 mm DIN 965 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-lasting fastening
• Precision threading with Class 6g fit and coarse M4x0.7 thread profile ensures secure engagement and vibration resistance
• Streamlined installation with Phillips No. 2 drive and standard flat head profile for flush mounting and efficient assembly
• Full thread coverage along the 20mm length provides maximum grip and load distribution across applications
• Regulatory compliance with DIN 965 standards and environmental regulations including RoHS 3 and REACH
• 90° countersink angle enables seamless surface integration while maintaining structural integrity

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these M4 flat head screws deliver critical performance advantages where corrosion resistance and mechanical reliability are paramount. The 316 stainless steel material combined with passivated finish provides exceptional protection against chemical exposure, saltwater, and extreme temperatures, making them ideal for marine equipment, chemical processing plants, and food-grade applications. The fully threaded design with coarse metric threading ensures maximum holding power in both soft and hard materials, while the Phillips drive and standard flat head profile enable rapid installation and flush surface finishing. These screws solve common engineering challenges including galvanic corrosion, thread stripping, and installation efficiency in automated assembly lines.

Specification Summary & Compliance

This metric flat head screw features precise M4x0.7 coarse threading with Class 6g thread fit according to ISO standards, ensuring consistent engagement and dimensional accuracy. Manufacturing complies with DIN 965 specifications for flat head screw geometry, including the 90° countersink angle and head dimensions (7.5mm diameter, 2.2mm height). The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety, making them suitable for regulated industries and international supply chains.