S-91306A435 1/2"-13 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc plating, ideal for harsh industrial environments
• Superior load-bearing capacity from 120,000 psi tensile strength for demanding applications
• Reliable, non-slip fastening enabled by the 5/16" hex drive for secure installation
• Optimized for rapid assembly with UNC coarse thread spacing and full threading
• Precise, secure thread engagement ensured by Class 3A fit, reducing the risk of cross-threading
• Enhanced durability and wear resistance from Rockwell C39 hardness for long service life
• Broad industry compliance meeting ASME B18.3 and ASTM F835 for guaranteed quality and safety

Professional Applications & Engineering Value

This zinc-plated alloy steel rounded head screw is engineered to solve critical fastening challenges in heavy machinery, structural assemblies, and industrial equipment. The combination of high tensile strength (120,000 psi) and Rockwell C39 hardness ensures it withstands extreme vibrational loads and stress without failing. The UNC coarse thread and fully threaded design allow for quicker installation and superior holding power in softer materials or where rapid disassembly isn't required. The rounded (button) head provides a clean, low-profile finish, reducing snag hazards while the 5/16" hex drive offers high torque capability for a secure, tight fit. It is an ideal solution for applications demanding reliability, speed, and compliance with rigorous industrial standards.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC thread with a Class 3A fit for precision and strength, a length of 1-1/4", and is manufactured to meet ASME B18.3 and ASTM F835 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free of hazardous substances for safe use in global markets.