S-91280A134 M4 x 12 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 that protects against rust and extends service life in demanding environments
• High tensile strength of 110,000 psi ensures reliable performance under heavy loads and vibration, reducing failure risks
• Class 8.8 strength grade provides excellent durability for industrial applications requiring robust fastening
• Fully threaded M4 coarse pitch design offers faster assembly and secure holding power in various materials
• External hex drive with precise head dimensions allows for easy installation using standard tools, improving workflow efficiency
• Rockwell C21 hardness maintains thread integrity and resists wear during repeated use
• Compliance with ISO 4017 and DIN 933 standards guarantees dimensional accuracy and interchangeability for global projects

Professional Applications & Engineering Value

This M4 hex head screw is engineered to address common industrial challenges such as joint loosening and material fatigue. Made from Class 8.8 steel, it delivers consistent high tensile strength and Rockwell C21 hardness, ensuring reliable performance in machinery, automotive assemblies, and structural frameworks. The fully threaded metric coarse pitch (M4 x 0.7mm) enables quick, secure fastening in metals and plastics, while the zinc plating provides essential corrosion resistance for outdoor or humid conditions. Its external hex drive and standardized dimensions (per ISO 4017/DIN 933) simplify maintenance and reduce downtime, making it a trusted choice for engineers seeking durable, industrial-grade fasteners that meet rigorous operational demands.

Specification Summary & Compliance

This fastener adheres to ISO 4017 and DIN 933 specifications, ensuring precise thread fit (Class 6h) and dimensional consistency. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, with full traceability in manufacturing. The metric coarse threading and right-hand thread direction support global interoperability, backed by ISO 898 standards for mechanical properties.