S-91255A005 4-48 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications without failure.
• Precise Class 3A thread fit provides tight, secure fastening with minimal risk of loosening in fine-thread assemblies.
• Fully threaded design offers consistent holding power along the entire 1/2" length for uniform load distribution.
• Easy installation and removal with 1/16" hex drive, reducing tool slippage and assembly time.
• Rounded button head profile delivers a low-profile, aesthetically pleasing finish while minimizing snagging risks.
• Compliance with ASME B18.3 and ASTM F835 guarantees adherence to industry standards for dimensional accuracy and quality.

Professional Applications & Engineering Value

This 4-48 UNF fine thread screw is engineered from black-oxide alloy steel to address common industrial challenges such as vibration-induced loosening and corrosion in demanding settings. The Class 3A thread fit and fully threaded construction ensure precise alignment and enhanced grip in applications like precision machinery, electronics enclosures, and automotive assemblies. With a rounded button head and hex drive, it simplifies installation in confined spaces while maintaining a sleek profile. Ideal for industrial screws requiring high tensile strength and fine-thread reliability, this fastener reduces maintenance needs and improves operational durability in right-hand thread systems.

Specification Summary & Compliance

This product features a 4-48 UNF fine thread with Class 3A fit for tight tolerances, 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) regulations, ensuring environmental safety and material integrity.