S-91255A707 1/2"-13 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 in heavy-duty and high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precision Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• Fully threaded design allows for maximum grip and adjustability along the entire length, offering versatile fastening solutions.
• High hardness (Rockwell C39) resists wear and deformation, ensuring long-term durability under repetitive loads.
• Coarse UNC threading enables quick and easy installation, saving time in assembly lines and field applications.
• Hex drive with 5/16" size offers high torque capability and slip-resistant engagement, facilitating efficient installation with standard tools.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel rounded head hex screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and environmental corrosion. The combination of high tensile strength and Class 3A thread fit ensures a secure, reliable fastening solution for heavy machinery, structural assemblies, and automotive components. The fully threaded UNC coarse thread design allows for rapid installation and robust holding power, while the black-oxide surface treatment provides an added layer of protection against rust and chemical exposure. Ideal for applications requiring repeated disassembly, this screw maintains its integrity under dynamic loads, reducing downtime and maintenance costs in demanding engineering environments.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with Class 3A fit for precise dimensional accuracy, ensuring consistent performance in threaded assemblies. It is manufactured in compliance with ASME B18.3 and ASTM F835 standards, guaranteeing adherence to rigorous engineering specifications. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various global markets.