S-91263A232 5/8"-11 x 1 3/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications
• Superior corrosion resistance with zinc-plated alloy steel construction for extended service life
• Precision Class 3A thread fit provides secure fastening with minimal vibration loosening
• 82° countersink angle enables flush mounting for clean, professional installations
• Full threading design offers maximum grip length and holding power
• Heavy-duty hex drive (3/8") allows for high-torque installation without stripping
• Coarse UNC threading ensures quick assembly and disassembly in various materials

Professional Applications & Engineering Value

This 5/8"-11 UNC flat head screw delivers exceptional engineering value for industrial applications where high tensile strength and reliable fastening are critical. The zinc-plated alloy steel construction provides superior corrosion resistance in harsh environments, while the Class 3A thread fit maintains precise tolerances for vibration-resistant connections. The 82° countersink angle and flat head design create seamless surface finishes in machinery, structural frameworks, and heavy equipment. With its hex drive configuration and coarse threading, this fastener enables rapid installation in steel frameworks, construction projects, and industrial assemblies where time efficiency and structural integrity are paramount.

Specification Summary & Compliance

This flat head screw features precision UNC coarse threading with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications, the fastener ensures consistent performance and interchangeability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, making it suitable for regulated industrial applications. The inch system measurements, including the 1-3/4" length and 5/8"-11 thread size, adhere to standardized industrial specifications for reliable performance across various applications.