S-91253A901 7/8"-9 x 3 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 demanding industrial applications
• Superior corrosion resistance from black-oxide coating extends service life in harsh environments
• Precision Class 3A thread fit provides secure fastening with minimal vibration loosening
• Heavy-duty hex drive design (9/16") allows for high torque application and easy installation
• Full threading along the entire 3-1/2" length enables maximum grip and load distribution
• Standard 82° countersink angle ensures flush mounting for clean, professional finishes
• Rockwell C37 hardness maintains structural integrity under repeated stress and load conditions

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this black-oxide alloy steel flat head screw addresses critical fastening challenges where corrosion resistance and structural integrity are paramount. The 7/8"-9 UNC coarse thread configuration combined with Class 3A thread fit ensures rapid installation and superior vibration resistance in machinery, structural steel assemblies, and equipment manufacturing. The hex drive design accommodates high-torque applications while the fully threaded construction provides consistent clamping force across the entire fastener length. Ideal for construction equipment, industrial machinery, and structural frameworks requiring reliable fastening solutions that withstand extreme operational stresses.

Specification Summary & Compliance

This flat head hex drive screw features precision 7/8"-9 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASTM F835 specifications with Rockwell C37 hardness and 130,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.