S-90124A587 5/16"-18 x 1 1/2" ASME B18.2.1, SAE J429 Steel Wire-Lockable Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel coating, extending service life in harsh industrial environments
• High-strength Grade 5 construction delivers 120,000 psi tensile strength for reliable performance in demanding applications
• External hex drive design provides secure tool engagement and efficient installation with standard wrenching tools
• UNC coarse threading with Class 2A fit ensures smooth assembly and vibration resistance in coarse-grained materials
• Partial threading configuration offers optimal clamping force distribution and prevents joint loosening
• Rockwell C25 hardness rating maintains structural integrity under repeated stress and mechanical loads
• Comprehensive regulatory compliance including RoHS 3 and REACH for global supply chain compatibility

Professional Applications & Engineering Value

This Grade 5 hex head screw with zinc-plated steel construction addresses critical engineering challenges in heavy machinery, structural assemblies, and industrial equipment. The 5/16"-18 UNC coarse threading provides excellent grip in soft materials and prevents cross-threading during high-volume assembly operations. With partial threading and external hex drive, installers achieve precise torque control while the Class 2A thread fit maintains consistent engagement in vibration-prone environments. The combination of 120,000 psi tensile strength and corrosion-resistant plating makes these hex head screws ideal for outdoor equipment, automotive subsystems, and construction applications where reliability and durability are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.2.1 and SAE J429 Grade 5 specifications with Class 2A thread fit tolerance. Features 5/16"-18 UNC coarse threads with 0.3125" diameter and 1-1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.