S-91253A087 2-56 x 1" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide coating, extending service life in demanding industrial environments
• Superior mechanical strength with 130,000 PSI tensile rating and Rockwell C39 hardness for reliable performance under high stress
• Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
• Optimized hex drive design (0.050") provides superior torque transmission and reduces stripping during installation
• Standard 82° countersink angle enables flush mounting for clean, professional finishes in precision applications
• Full threading along 1" length offers maximum grip range and adjustment flexibility in various material thicknesses
• Comprehensive regulatory compliance meets ASTM F835, RoHS 3, and REACH standards for global industrial acceptance

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver critical engineering solutions where high-strength fastening meets precision requirements. The Black-Oxide Alloy Steel construction provides superior protection against corrosion while maintaining 130,000 PSI tensile strength for structural integrity in vibration-prone environments. The hex drive configuration ensures positive engagement during installation, preventing cam-out in automated assembly processes. With Class 3A thread precision and coarse thread spacing, these screws excel in electronics enclosures, machinery guards, and aerospace components where reliable, vibration-resistant connections are paramount. The standard 82° countersink profile facilitates seamless integration into precision-machined surfaces, making them ideal for applications requiring flush mounting and aesthetic consistency.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 3A thread fit tolerance for superior engagement. Complies with ASTM F835 specifications for mechanical properties and performance standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features UNC coarse thread profile with right-hand threading and standard flat head profile for consistent performance across industrial applications.