S-91255A201 8-32 x 1 1/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Superior torque transmission through hex drive design, preventing tool slippage and ensuring secure fastening
• High-strength alloy steel construction with 120,000 psi tensile strength for reliable performance under heavy loads
• Precision Class 3A thread fit ensuring consistent engagement and vibration resistance in critical assemblies
• Full threading along 1-1/4" length provides maximum grip and adjustment flexibility in various material thicknesses
• Low-profile rounded button head offers a finished appearance while minimizing protrusion in confined spaces
• Comprehensive regulatory compliance meeting ASME, ASTM, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 8-32 UNC screws with coarse thread spacing deliver reliable performance in machinery, equipment assembly, and structural frameworks. The black-oxide alloy steel construction provides superior corrosion protection where environmental factors threaten fastener integrity, while the Rockwell C39 hardness ensures exceptional wear resistance against repeated stress cycles. The hex drive design enables high-torque installation without cam-out issues, critical for maintenance operations requiring consistent disassembly and reassembly. With fully threaded construction and Class 3A thread fit, these screws maintain precise clamping force in vibration-prone environments, solving common loosening problems in automotive, manufacturing, and heavy equipment sectors.

Specification Summary & Compliance

This rounded head screw features precision 8-32 UNC threads with Class 3A fit for superior dimensional accuracy and engagement. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) requirements for chemical safety, making it suitable for global industrial distribution and environmentally conscious procurement programs.