S-91280A128 M4 x 8 mm ISO 4017, DIN 933, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Class 8.8 steel construction, providing reliable performance in demanding industrial environments
• Superior corrosion resistance from zinc plating, extending service life and reducing maintenance costs
• High tensile strength of 110,000 psi ensures secure fastening under heavy loads and vibration
• Easy installation and removal with external hex drive design and coarse 0.7mm thread pitch
• Precise thread fit (Class 6h) guarantees consistent engagement and reduces the risk of cross-threading
• Full threading along the 8mm length maximizes grip strength and distribution of clamping force
• Compliance with international standards including ISO 4017 and DIN 933 for guaranteed interchangeability

Professional Applications & Engineering Value

These M4 hex head screws are engineered to address critical challenges in industrial assembly, where vibration resistance, corrosion protection, and consistent clamping force are paramount. The Class 8.8 steel construction and Rockwell C21 hardness provide excellent mechanical strength, preventing shear failure under dynamic loads. The zinc plating offers a protective barrier against moisture and chemicals, making these metric coarse thread fasteners ideal for outdoor equipment, machinery frames, and automotive components. With fully threaded design and external hex drive, they ensure rapid installation and reliable performance in high-volume manufacturing and maintenance operations.

Specification Summary & Compliance

This M4 x 0.7mm x 8mm hex head screw features precise Class 6h thread fit per metric standards, ensuring accurate engagement. Manufactured in compliance with ISO 4017 and DIN 933 specifications for dimensional consistency. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming suitability for global industrial applications without hazardous substances.