S-91255A826 0-80 x 5/16" 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 demanding mechanical assemblies.
• Precision Class 3A thread fit guarantees tight, secure connections with minimal risk of loosening.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance and a durable, wear-resistant surface.
• Fine UNF thread spacing offers superior holding power and vibration resistance in precision applications.
• Fully threaded design allows for maximum engagement and consistent clamping force along the entire length.
• Hex drive and rounded button head facilitate easy installation and a low-profile, finished appearance.
• High Rockwell C39 hardness ensures excellent wear resistance and long-term durability under load.

Professional Applications & Engineering Value

This 0-80 UNF screw is engineered for high-precision applications where reliability and strength are critical. The black-oxide alloy steel construction provides superior corrosion resistance, making it ideal for environments exposed to moisture or chemicals. The fine thread spacing and Class 3A thread fit ensure a secure, vibration-resistant connection, reducing the need for frequent maintenance in machinery, electronics, and aerospace assemblies. Its fully threaded design and rounded button head with hex drive allow for efficient installation and a clean, professional finish, solving common issues of thread stripping and uneven clamping in tight spaces.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit tolerances for precision, with UNF fine threads and dimensions in the inch system. It meets ASME B18.3 and ASTM F835 manufacturing standards, ensuring consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free of hazardous substances, making it suitable for global industrial and electronic applications.