S-91268A291 3/8"-16 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 PSI tensile strength ensure reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Wear Resistance: Rockwell C33 hardness provides excellent durability and resistance to deformation under heavy loads, extending service life.
• Optimized Thread Engagement: 3/8"-16 UNC coarse threads and Class 2A thread fit offer quick assembly and secure fastening, minimizing cross-threading risks.
• Enhanced Torque Application: External hex drive and 9/16" head width allow for high torque application with standard tools, improving installation efficiency.
• Versatile Partial Threading: Partially threaded design with 1" minimum thread length provides strong clamping force on unthreaded sections, ideal for dynamic load applications.
• Industry Compliance Assurance: Meets ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and mechanical properties for critical industrial use.
• Environmental Responsibility: RoHS 3 and REACH compliance guarantees safe use in regulated environments without hazardous substances.

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial settings where high tensile strength and reliability are paramount. The steel construction with Rockwell C33 hardness resists wear in vibrating machinery, while the 3/8"-16 UNC coarse thread configuration ensures rapid installation in structural steel, heavy equipment, and automotive assemblies. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under dynamic loads. With 150,000 PSI tensile strength, these external hex drive fasteners provide secure connections in construction, manufacturing, and transportation applications where failure is not an option.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 3/8"-16 UNC coarse threads and 2 1/2" length. Manufactured to ASME B18.2.1 and SAE J429 standards for dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors.