S-92327A338 5/8"-11 x 4" ASME B18.2.1, SAE J429 Square Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating for extended service life in harsh environments
• High tensile strength of 120,000 psi provides reliable performance under significant mechanical stress
• External square drive design ensures secure tool engagement and prevents stripping during installation
• SAE Grade 5 medium strength rating delivers optimal balance of durability and flexibility for demanding applications
• Coarse UNC threading enables faster installation and better performance in softer materials
• Rockwell C25 hardness maintains structural integrity under repeated loading and vibration
• Full threading along the 4" length provides maximum grip and adjustment flexibility

Professional Applications & Engineering Value

This 5/8"-11 UNC square head screw delivers exceptional engineering value in heavy-duty industrial applications where reliability is paramount. The SAE Grade 5 steel construction combined with 120,000 psi tensile strength ensures these fasteners withstand extreme mechanical stresses in construction, machinery assembly, and structural applications. The external square drive provides superior torque transmission compared to conventional drives, reducing installation time while preventing cam-out. The zinc yellow-chromate plating offers enhanced corrosion protection, making these square head screws ideal for outdoor equipment, agricultural machinery, and industrial environments where moisture and chemicals are present. The coarse UNC threading ensures quick assembly and reliable performance in wood, steel, and composite materials.

Specification Summary & Compliance

This 4" length square head screw features Unified Standard Class 2A thread fit for consistent engagement and proper clearance. Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties. The 5/8"-11 UNC coarse thread configuration provides optimal performance in various materials, while the right-hand threading follows industry standards for compatibility with existing equipment and tools. Compliance with these rigorous standards guarantees consistent quality and performance across all applications.