S-91257A932 7/8"-14 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating in demanding environments
• Optimized torque transmission with external hex drive design for secure installation
• Precise thread engagement with UNF fine threading and Class 2A fit for vibration resistance
• Enhanced durability with Rockwell C33 hardness maintaining performance under stress
• Reliable partial threading allowing for both clamping and alignment functions
• Industry compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance in heavy machinery, structural steel connections, and industrial equipment assembly. The UNF fine threading provides superior resistance to vibrational loosening compared to coarse threads, while the zinc yellow-chromate plating creates a robust barrier against corrosion in harsh operating conditions. The partially threaded design enables precise clamping force distribution, making these steel fasteners ideal for applications requiring both secure fastening and component alignment. With 150,000 psi tensile strength and Rockwell C33 hardness, they maintain structural integrity under extreme loads, reducing maintenance frequency and downtime in industrial settings.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with 7/8"-14 UNF fine threading and 3" length. Complies with ASME B18.2.1 and SAE J429 Grade 8 specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for industrial use.