S-91253A339 5/16"-24 x 1 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength - With 130,000 psi tensile strength, these screws provide reliable holding power in high-stress industrial applications.
• Superior Corrosion Resistance - Black-oxide coating on alloy steel significantly enhances durability against rust and environmental degradation.
• Precision Thread Fit - Class 3A thread tolerance ensures tight, secure connections with minimal vibration loosening.
• Optimized Drive Performance - Hex drive design with 3/16" drive size delivers maximum torque transmission and installation efficiency.
• Enhanced Material Hardness - Rockwell C39 hardness rating maintains thread integrity and prevents stripping during repeated use.
• Comprehensive Compliance - Meets ASTM F835 specifications while being RoHS 3 and REACH compliant for global regulatory acceptance.
• Versatile Installation Profile - Standard 82° countersink angle allows for flush mounting in various materials and applications.

Professional Applications & Engineering Value

These 5/16"-24 UNF Class 3A flat head screws deliver critical performance advantages in demanding industrial environments. The black-oxide alloy steel construction provides superior corrosion resistance compared to standard finishes, making them ideal for machinery, automotive assemblies, and outdoor equipment where environmental exposure is a concern. The fine thread spacing and Class 3A thread fit ensure vibration-resistant connections in precision applications, while the fully threaded design offers consistent engagement throughout the entire 1 1/2" length. The combination of 130,000 psi tensile strength and Rockwell C39 hardness addresses common failure points in high-vibration applications, providing engineers with a reliable fastener solution that maintains integrity under continuous stress cycles.

Specification Summary & Compliance

These flat head screws feature precision 5/16"-24 UNF fine threads with Class 3A tolerance for exacting fit requirements. Manufacturing complies with ASTM F835 specifications for consistent quality and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring they meet current environmental and safety standards for industrial use worldwide.