S-91253A991 1 1/2"-6 x 6" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Superior tensile strength of 130,000 psi ensures reliable performance in heavy-duty applications
• Precise Class 3A thread fit provides excellent engagement and vibration resistance in critical assemblies
• Optimized hex drive design with 1" drive size delivers maximum torque transfer and installation efficiency
• 82° countersink angle enables flush mounting for clean, professional finishes
• Rockwell C37 hardness maintains structural integrity under high stress conditions
• Comprehensive compliance with ASTM F835, RoHS 3, and REACH standards for quality assurance

Professional Applications & Engineering Value

These 1 1/2"-6 UNC flat head hex drive screws are engineered to solve critical fastening challenges in demanding industrial applications. The black-oxide alloy steel construction provides superior corrosion resistance, making them ideal for machinery, structural frameworks, and outdoor equipment where environmental exposure is a concern. The coarse UNC threading and Class 3A thread fit ensure rapid installation and secure holding power in materials where fine threads might strip or fail. With partial threading and 82° countersink angle, these screws deliver precise clamping force distribution while maintaining flush surface profiles. The combination of 130,000 psi tensile strength and Rockwell C37 hardness makes them particularly valuable in heavy machinery, construction equipment, and industrial manufacturing where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

Manufactured to exacting inch system dimensions with Class 3A thread fit tolerance for precision engagement. These flat head hex drive screws comply with ASTM F835 manufacturing specifications and feature UNC coarse threading with 6" length and 3 3/4" minimum thread length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.