S-91239A812 M5 x 55 mm ISO 7380 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability with Class 12.9 strength grade and 170,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance from black-oxide coating on alloy steel, extending service life in harsh industrial environments
• Precise installation and removal with 3 mm hex drive design, ensuring secure torque application and reducing tool slippage
• Optimized thread engagement through Class 6g thread fit and coarse 0.8 mm pitch, providing secure fastening with reduced cross-threading risk
• Enhanced material integrity with Rockwell C39 hardness, maintaining structural stability under high-stress conditions
• Versatile rounded button head profile offering a low-profile finish that minimizes protrusion while distributing clamp load effectively
• Full thread coverage along the 55 mm length for maximum grip and adjustability in various material thicknesses

Professional Applications & Engineering Value

These M5 button head screws deliver critical engineering advantages in heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The black-oxide alloy steel construction combined with Class 12.9 strength rating addresses common failure points in machinery, automotive assemblies, and construction equipment by providing exceptional fatigue resistance. The fully threaded metric design with coarse 0.8 mm pitch ensures rapid installation and reliable performance in high-vibration environments, while the hex drive system allows for precise torque control during assembly. These ISO 7380 compliant fasteners solve alignment challenges in tight spaces through their rounded head profile, making them ideal for applications requiring both high clamping force and streamlined aesthetics.

Specification Summary & Compliance

Manufactured to ISO 7380 standards with Class 6g thread tolerance for precision fit. These metric screws feature M5 x 0.8 mm coarse threading and 55 mm fully threaded length. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment on alloy steel provides consistent corrosion protection while maintaining the 170,000 psi tensile strength and Rockwell C39 hardness required for industrial applications.