S-91255A311 10-24 x 1 3/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for reliable performance in harsh industrial environments
• Superior mechanical strength with 120,000 psi tensile rating and Rockwell C39 hardness for heavy-duty applications
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening in demanding conditions
• Optimized installation efficiency featuring 1/8" hex drive and rounded button head for quick assembly and reduced tool slippage
• Reduced material stress through partially threaded design that minimizes thread galling and distributes clamping forces evenly
• Regulatory compliance assurance meeting ASME B18.3 and ASTM F835 specifications for quality and performance consistency
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

These 10-24 UNC coarse thread screws deliver critical performance advantages in industrial assembly applications where vibration resistance and structural integrity are paramount. The black-oxide alloy steel construction provides enhanced corrosion protection while maintaining the 120,000 psi tensile strength required for heavy machinery, automotive components, and electrical enclosures. The partially threaded design prevents thread binding in deep-tapped holes, while the rounded button head with hex drive ensures flush mounting and secure torque transmission. Engineered to withstand extreme operating conditions, these Class 3A thread fit fasteners eliminate the need for frequent maintenance in vibration-prone assemblies, significantly reducing downtime and replacement costs across manufacturing, construction, and equipment maintenance sectors.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit tolerances with UNC coarse threading (10-24 size) and 1 3/4" length. Complies with ASME B18.3 dimensional standards and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features right-hand thread orientation with 7/8" minimum thread length and standardized rounded head profile for consistent performance across industrial applications.