S-91263A804 5/8"-11 x 1" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc plating that protects against rust in demanding industrial environments
• Superior load-bearing capability from 130,000 PSI tensile strength alloy steel construction for heavy-duty applications
• Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections in critical assemblies
• Optimized flush mounting through 82° countersink angle and flat head design for smooth surface finishes
• Enhanced installation efficiency with 3/8" hex drive providing secure tool grip and torque transmission
• Maximum thread coverage through fully threaded design for consistent clamping force along entire fastener length
• Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for global market acceptance

Professional Applications & Engineering Value

These zinc-plated alloy steel flat head screws deliver critical performance where structural integrity and environmental resistance are paramount. The 5/8"-11 UNC coarse thread configuration provides excellent engagement in various materials while resisting vibration loosening. With Rockwell C37 hardness and 130,000 PSI tensile strength, these industrial screws withstand extreme mechanical stresses in heavy machinery, construction equipment, and transportation applications. The 82° countersink angle ensures proper seating in standardized chamfers, creating flush surfaces that prevent snagging and improve safety. The fully threaded design distributes clamping force evenly, making these hex drive fasteners ideal for critical joints requiring uniform pressure distribution across the entire connection length.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit for superior tolerance control and UNC coarse threading for rapid assembly. Complies with ASTM F835 specifications for mechanical properties and performance requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restriction of hazardous substances. Right-hand thread direction with standard flat head profile and complete threading from tip to head for consistent fastening performance.