S-91253A839 3/4"-10 x 1 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending the screw's service life in harsh or outdoor conditions.
• Hex drive design (1/2") allows for high-torque installation with common tools, speeding up assembly and reducing labor time.
• Fully threaded body and 82° countersink enable flush mounting and consistent grip across the entire length, improving joint integrity.
• Compliance with ASTM F835, RoHS 3, and REACH ensures the screw meets rigorous industry standards for safety and environmental responsibility.
• Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity through repeated use and heavy loads.

Professional Applications & Engineering Value

Engineered for heavy-duty fastening, this 3/4"-10 UNC flat head screw is ideal for applications requiring high clamp load and vibration resistance, such as machinery frames, structural steel assemblies, and industrial equipment. The black-oxide alloy steel construction combats rust and wear, while the Class 3A thread fit minimizes loosening under dynamic loads. Its fully threaded design and 82° countersink angle ensure a flush, secure fit in pre-drilled holes, reducing stress concentrations and enhancing overall assembly durability. These features make it a reliable choice for engineers and procurement specialists seeking long-term performance in corrosive or high-stress environments.

Specification Summary & Compliance

This screw adheres to UNC coarse threading with a Class 3A thread fit for precise engagement, and dimensions are in the inch system (e.g., 1-1/2" length, 3/4"-10 thread size). It meets ASTM F835 specifications for mechanical properties and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.