S-91255A091 3-48 x 3/16" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for demanding industrial environments
• Superior mechanical strength from alloy steel with 120,000 psi tensile strength for reliable load-bearing applications
• Precise thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
• Optimized installation efficiency through hex drive design providing superior torque transmission
• Enhanced durability with Rockwell C39 hardness maintaining structural integrity under repeated use
• Versatile compatibility with UNC coarse threads suitable for various materials and assembly requirements
• Complete thread coverage with fully threaded design for maximum grip along the entire fastener length

Professional Applications & Engineering Value

These 3-48 UNC rounded head hex drive screws deliver critical performance in precision assemblies where reliability is paramount. The black-oxide alloy steel construction provides excellent corrosion protection while maintaining the high tensile strength needed for structural applications. The Class 3A thread fit ensures precise engagement in tapped holes, reducing the risk of cross-threading and assembly errors. The button head profile offers a low-profile finish that clears obstructions while the hex drive enables high-torque installation without cam-out issues. Ideal for electronics enclosures, machinery components, and automotive assemblies where coarse threads provide rapid installation and secure holding power in various materials.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNC coarse thread form (3-48 size). Complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets environmental standards including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. Features right-hand thread direction with fully threaded design and standard rounded head profile for consistent performance across industrial applications.