S-91251A387 5/16"-24 x 1 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Exceptional tensile strength of 170,000 psi prevents fastener failure under extreme loads
• Precise Class 3A thread fit ensures secure mating with UNF nuts and threaded components
• Fine thread configuration provides superior vibration resistance and clamping force retention
• Hex socket drive design allows high torque application with minimal head protrusion
• Full threading along 1-1/2" length offers maximum adjustment flexibility in assembly applications
• Rockwell C37 hardness maintains thread integrity and drive socket durability through repeated use

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers critical performance where space constraints and high strength requirements intersect. The 5/16"-24 UNF fine thread configuration provides superior resistance to vibrational loosening in machinery, automotive, and aerospace applications. The hex drive socket head enables installation in confined spaces where traditional wrenches cannot operate, while the Class 3A thread fit guarantees precise engagement with mating components. Engineered to ASTM A574 specifications, these screws maintain structural integrity in high-stress assemblies, from heavy equipment frames to precision manufacturing jigs, where 170,000 psi tensile strength prevents catastrophic failure and ensures long-term reliability.

Specification Summary & Compliance

Manufactured to ASTM A574 standards with Class 3A thread fit precision and UNF fine thread specifications. The black-oxide alloy steel construction provides consistent performance across the 1-1/2" fully threaded length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in global industrial applications while maintaining Rockwell C37 hardness and dimensional accuracy throughout the fastener's service life.