S-91247A546 1/4"-20 x 1 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 5 classification and 120,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the zinc plating, extending the fastener's service life in various industrial environments.
• Optimized for high-torque assembly thanks to the external hex drive and hex head design, allowing for secure and efficient installation.
• Reliable coarse UNC thread engagement that facilitates quicker assembly and reduces the risk of cross-threading in coarse-alignment situations.
• Precision-engineered thread fit with Class 2A tolerance, ensuring consistent and secure fastening with standard nuts and tapped holes.
• Versatile partial threading offering an unthreaded shank for enhanced shear strength and precise clamping in specific joint designs.
• Comprehensive compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for guaranteed quality and environmental safety.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical fastening challenges in heavy-duty industrial settings. The combination of high tensile strength (120,000 psi) and Rockwell C25 hardness ensures it can withstand substantial vibrational loads and mechanical stress without failing, making it ideal for machinery, structural frames, and automotive assemblies. The zinc plating provides a durable barrier against corrosion, significantly reducing maintenance needs in harsh environments. Its coarse UNC thread (1/4"-20) and partial threading allow for rapid installation and superior resistance to loosening, while the external hex drive facilitates high-torque application with standard tools. This screw delivers reliable, long-term performance in applications demanding robust and compliant industrial fasteners.

Specification Summary & Compliance

This fastener adheres to precise dimensional and performance criteria, including a Class 2A thread fit for consistent assembly and UNC coarse thread standards. It is manufactured in compliance with ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring mechanical reliability. The product is also verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.