S-91280A140 M4 x 20 mm ISO 4017, DIN 933, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced Durability: Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments.
• High Tensile Strength: Class 8.8 steel construction with 110,000 psi tensile strength ensures reliable performance under heavy loads.
• Secure Fastening: Fully threaded M4 coarse pitch (0.7mm) design offers excellent grip and vibration resistance in various materials.
• Easy Installation: External hex drive and standard hex head allow for quick, tool-compatible assembly and disassembly.
• Precision Engineering: Thread Fit Class 6h and compliance with ISO 4017/DIN 933 ensure consistent dimensional accuracy and interchangeability.
• Material Hardness: Rockwell C21 hardness provides excellent wear resistance, maintaining thread integrity through repeated use.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, making them suitable for regulated industries and international projects.

Professional Applications & Engineering Value

These M4 hex head screws deliver exceptional engineering value in demanding applications where reliability is critical. The Class 8.8 steel construction combined with zinc plating addresses common industrial challenges including corrosion-induced failure and material fatigue. The fully threaded design with coarse 0.7mm pitch provides superior holding power in soft materials and prevents loosening under vibration, making them ideal for machinery assembly, automotive components, and structural frameworks. Their compliance with ISO 4017 and DIN 933 standards ensures consistent performance across global engineering projects, while the external hex drive facilitates efficient installation in confined spaces common in industrial equipment maintenance and manufacturing operations.

Specification Summary & Compliance

This M4 x 0.7mm x 20mm hex head screw features precise Thread Fit Class 6h tolerances and metric coarse threading according to ISO standards. Manufacturing specifications strictly adhere to ISO 4017 and DIN 933 for dimensional accuracy and mechanical properties. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for international industrial applications.