S-91255A380 5/16"-24 x 5/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide coating, ideal for harsh industrial environments and extending service life.
• Superior tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, preventing fastener failure.
• Precision Class 3A thread fit guarantees tighter tolerances and secure, vibration-resistant assemblies in critical applications.
• Fine UNF thread spacing provides enhanced clamping force and improved load distribution compared to coarse threads.
• Rounded button head design offers a low-profile, finished appearance while reducing the risk of snagging and injury.
• 3/16" hex drive allows for high-torque installation with standard tools, ensuring efficient and secure fastening.
• Full threading along the 5/8" length maximizes grip range and provides versatile fastening depth in various materials.

Professional Applications & Engineering Value

This 5/16"-24 UNF Class 3A screw is engineered for demanding applications where precision and durability are paramount. The Black-Oxide Alloy Steel construction provides excellent resistance to corrosion and wear, making it suitable for automotive assemblies, heavy machinery, and electronic enclosures exposed to challenging conditions. The fine thread spacing and Class 3A fit ensure minimal backlash and superior vibration resistance, critical in dynamic load environments. The rounded head with hex drive facilitates easy installation in confined spaces while maintaining a clean, professional finish. This combination of high tensile strength and robust material properties delivers long-term reliability, reducing maintenance needs and downtime in industrial operations.

Specification Summary & Compliance

This screw features a 5/16"-24 UNF thread with a Class 3A fit for high-precision applications, ensuring tight dimensional accuracy. It is manufactured in compliance with ASME B18.3 and ASTM F835 standards, guaranteeing consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to stringent environmental and safety regulations for industrial use.