S-91247A567 1/4"-20 x 6 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable load-bearing capacity for demanding industrial applications
• Grade 5 classification provides consistent mechanical properties and guaranteed performance in heavy-duty fastening scenarios
• Zinc plating finish offers superior corrosion resistance, extending service life in various environmental conditions
• Partially threaded design allows for precise clamping force control and secure joint assembly
• Coarse UNC thread pattern enables faster installation and reduced cross-threading risks in production environments
• External hex drive configuration delivers maximum torque transmission and tool compatibility for efficient assembly
• Rockwell C25 hardness maintains thread integrity and prevents stripping during repeated installation cycles

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering value through its optimized steel construction and zinc plating surface treatment. The combination of 120,000 PSI tensile strength and Rockwell C25 hardness addresses common industrial challenges including vibration-induced loosening, dynamic loading, and material fatigue. The 1/4"-20 UNC coarse thread configuration provides excellent engagement in both metallic and composite materials, while the partially threaded design creates secure clamping zones in structural assemblies. These industrial screws are engineered to maintain integrity in construction equipment, machinery frames, and heavy-duty infrastructure where reliable fastening solutions prevent costly downtime and ensure operational safety.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent assembly performance. Complies with ASME B18.2.1 and SAE J429 specifications governing mechanical properties and dimensional requirements. Meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations governing chemical safety. The 6-1/2" length with 1" minimum thread length provides standardized engagement characteristics across compatible applications.