S-91263A495 M12 x 50 mm DIN 7991 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial conditions.
• High hardness rating (Rockwell C39) provides excellent wear resistance and maintains thread integrity during repeated installation and removal.
• Optimized torque transmission through the 8mm hex drive design prevents tool slippage and ensures secure, efficient fastening operations.
• Precision coarse threading (M12x1.75) with Class 5g6g fit enables quick assembly and superior vibration resistance in heavy machinery and structural applications.
• Full threading along the 50mm length offers maximum grip and adjustment flexibility across the entire fastener engagement area.
• Compliance with DIN 7991 standards guarantees consistent quality, dimensional accuracy, and interoperability with metric component systems.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Class 12.9 flat head hex screws deliver exceptional reliability where high tensile strength and vibration resistance are critical. The zinc-plated alloy steel construction provides essential corrosion protection for outdoor equipment, automotive assemblies, and heavy machinery exposed to moisture and chemicals. With their M12 coarse thread pitch (1.75mm) and fully threaded design, these fasteners ensure rapid installation and superior clamping force distribution in structural steel connections, manufacturing jigs, and precision equipment. The 90° countersink angle creates a flush surface finish while the 8mm hex drive enables high-torque application without cam-out, making them ideal for high-stress applications requiring both aesthetic cleanliness and mechanical performance.

Specification Summary & Compliance

This metric flat head screw features precise Class 5g6g thread fit tolerance according to ISO standards, ensuring consistent engagement and load distribution. Manufacturing complies with DIN 7991 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, confirming adherence to environmental regulations for hazardous substance restrictions. The Class 12.9 strength rating corresponds to minimum tensile strength of 170,000 PSI and Rockwell C39 hardness, validating its suitability for high-performance industrial fastening applications.