S-91280A144 M4 x 25 mm ISO 4017, DIN 933, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Class 8.8 grade with 110,000 psi tensile capacity ensures reliable performance under high-stress industrial conditions
• Superior Corrosion Protection – Zinc plating creates a durable barrier against rust and environmental degradation in demanding applications
• Precision Thread Engagement – Class 6h thread fit with M4x0.7mm coarse spacing provides secure fastening and vibration resistance
• Optimized Drive Efficiency – External hex head design (7mm width) enables high-torque installation with standard wrench tools
• Full Thread Coverage – 25mm fully threaded shaft maximizes grip length and load distribution across connected materials
• Certified Material Performance – Steel construction with Rockwell C21 hardness maintains structural integrity through repeated use cycles
• Global Compliance Assurance – Meets ISO 4017/DIN 933 manufacturing standards with RoHS 3 and REACH regulatory compliance

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these M4 hex head screws solve critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The Class 8.8 strength grade combined with zinc plated steel construction delivers exceptional resistance to both mechanical stress and environmental corrosion. The metric coarse threading (M4x0.7mm) ensures rapid installation while maintaining vibration resistance in dynamic operating conditions. With full threading along the 25mm length, these external hex drive fasteners provide maximum thread engagement for secure joints in metal-to-metal and composite material applications. The right-hand thread direction and standardized dimensions make them ideal for maintenance operations and production line efficiency.

Specification Summary & Compliance

Manufactured to ISO 4017 and DIN 933 specifications with Class 6h thread tolerance for precision fit. The M4x0.7mm coarse thread configuration ensures compatibility with standard metric components. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and material transparency. Mechanical properties include Rockwell C21 hardness and 110,000 psi tensile strength certified to ISO 898 standards for consistent performance across industrial applications.