S-91280A998 M20 x 25 mm ISO 4017, DIN 933 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 environments
• High tensile strength of 110,000 psi (Class 8.8) ensures reliable performance under heavy loads
• Precise Class 6h thread fit for smooth assembly and consistent clamping force
• Fully threaded design provides maximum grip and uniform stress distribution along the entire length
• External hex drive and hex head allow for high-torque installation with standard tools
• Coarse M20x2.5mm thread enables quick assembly and reduced cross-threading risk
• Compliance with ISO 4017/DIN 933 guarantees dimensional accuracy and interchangeability

Professional Applications & Engineering Value

This M20 hex head screw is engineered for heavy-duty industrial applications where reliability is critical. The Class 8.8 steel construction and Rockwell C21 hardness provide exceptional resistance to shear and tensile forces, preventing failure in structural assemblies, machinery, and equipment frames. The zinc plated finish offers a protective barrier against oxidation and chemical exposure, making it ideal for outdoor or humid environments. With its fully threaded metric coarse design and external hex drive, it ensures rapid installation and secure fastening in high-vibration settings, reducing maintenance downtime and improving operational safety.

Specification Summary & Compliance

This fastener meets ISO 4017 / DIN 933 specifications for dimensional accuracy, including M20x2.5mm coarse threads with a Class 6h thread fit. It is manufactured from steel with a zinc plated finish and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and sustainability in industrial use.