S-91255A142 6-32 x 3/16" ASME B18.3 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior holding power from fully threaded design and 120,000 psi tensile strength
• Precise installation control with 5/64" hex drive and Class 3A thread fit for minimal backlash
• Enhanced durability from Rockwell C39 hardness alloy steel, resisting wear and deformation
• Reliable coarse threading (UNC) for faster assembly and reduced cross-threading risks
• Low-profile rounded button head provides a finished appearance while minimizing snagging
• Full regulatory compliance ensures material safety and meets global engineering standards

Professional Applications & Engineering Value

These black-oxide alloy steel screws with 6-32 UNC coarse threads deliver critical reliability in demanding assemblies. The fully threaded design maximizes engagement in thin materials and soft substrates, preventing loosening under vibration. With 120,000 psi tensile strength and Class 3A thread fit, they maintain clamp load in high-stress applications like machinery guards, electronic enclosures, and automotive components. The 5/64" hex drive offers secure tool engagement for controlled torque application, while the rounded button head eliminates sharp edges in accessible areas. Engineered to solve fastener failure points in industrial equipment and metal fabrication, these screws combine mechanical performance with corrosion-resistant black-oxide coating for extended service life.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread fit ensuring precision interchangeability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for hazardous substance restrictions. Inch-system dimensions include #6-32 UNC coarse threads, 3/16" length, and 0.262" head diameter with standardized right-hand threading for consistent assembly.