S-91280A136 M4 x 16 mm ISO 4017, DIN 933, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
• High tensile strength of 110,000 psi ensures reliable performance under heavy loads and vibration
• Class 8.8 strength grade provides excellent mechanical properties for critical fastening applications
• Coarse 0.7mm thread pitch enables faster assembly and reduced cross-threading risk
• Class 6h thread fit guarantees precise engagement and consistent clamping force
• Fully threaded design offers maximum grip length and uniform stress distribution
• External hex drive allows for high torque application with standard tools

Professional Applications & Engineering Value

These M4 hex head screws deliver exceptional engineering value through their Class 8.8 steel construction and precision metric coarse threading. The combination of 110,000 psi tensile strength and Rockwell C21 hardness ensures they withstand extreme mechanical stresses in heavy machinery, automotive assemblies, and structural frameworks. The zinc plating finish provides critical corrosion protection in humid or chemically aggressive environments, while the fully threaded design with 0.7mm pitch facilitates rapid installation in production lines. These industrial fasteners solve common assembly challenges by maintaining clamp load integrity under dynamic loading conditions, making them ideal for applications requiring reliable, heavy-duty fastening solutions.

Specification Summary & Compliance

Manufactured to ISO 4017 and DIN 933 standards with Class 6h thread fit precision. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features M4 x 0.7mm coarse thread with 16mm length and external hex drive configuration. Meets ISO 898 mechanical property requirements for Class 8.8 strength grade fasteners.