S-91309A918 1"-8 x 2 3/4" ASME B18.2.1, SAE J429 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• High tensile strength of 60,000 PSI ensures reliable performance under heavy loads and vibration
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• Class 2A thread fit offers consistent, reliable engagement for simplified assembly and disassembly
• Partially threaded design allows for precise clamping force control and secure fastening in structural applications
• External hex drive enables high-torque installation with standard tools, reducing assembly time
• Coarse UNC threading ensures quick installation and reduced cross-threading risk in demanding conditions

Professional Applications & Engineering Value

This 1"-8 UNC hex head screw delivers exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly. The high-strength steel construction with zinc plating combats corrosion in outdoor or high-moisture environments, while the coarse thread design maintains grip strength in materials prone to vibration loosening. The partially threaded configuration concentrates clamping force precisely where needed, preventing joint failure in critical applications. Engineered to meet ASME B18.2.1 standards, these external hex drive screws provide reliable performance where 60,000 PSI tensile strength and consistent thread engagement are paramount for safety and longevity.

Specification Summary & Compliance

This hex head screw features Class 2A thread fit per UNC standards with 1"-8 coarse threading and 2 3/4" length. Manufactured to ASME B18.2.1 specifications (referencing SAE J429) with Rockwell B69 hardness and 60,000 PSI tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.