S-91255A836 8-36 x 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-reflective surface for harsh environments.
• Rockwell C39 hardness delivers excellent wear resistance and longevity, maintaining thread integrity through repeated use.
• Fully threaded UNF fine thread design allows for maximum grip and load distribution across the entire fastener length.
• Hex drive (3/32") enables easy installation and high torque application with standard tools, speeding up assembly processes.
• Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability for industrial and engineering applications.

Professional Applications & Engineering Value

This 8-36 UNF Class 3A black-oxide alloy steel rounded head screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion. The fine UNF threads and Class 3A fit ensure tight, secure fastening in precision equipment, automotive assemblies, and machinery where alignment and stability are paramount. The black-oxide surface treatment provides a protective layer that withstands exposure to oils, moisture, and chemicals, extending service life in demanding environments. With a fully threaded right-hand design and high tensile strength, it distributes loads evenly and resists shear forces, making it ideal for applications requiring reliable, high-strength fasteners that meet rigorous industry standards.

Specification Summary & Compliance

This screw features precise Class 3A thread fit per UNF standards, ensuring tight tolerances for secure assembly. It complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.