S-91257A993 1"-8 x 10 1/2" 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 reliable performance in high-stress applications
• Superior corrosion protection through zinc yellow-chromate plating that extends service life in harsh environments
• Optimized thread engagement with coarse 1"-8 UNC threads providing excellent grip and vibration resistance
• High-grade material construction meeting Grade 8 standards with Rockwell C33 hardness for maximum durability
• Easy installation and removal with external hex drive design allowing for high torque application
• Precision manufacturing with Class 2A thread fit ensuring consistent performance and proper mating
• Versatile partial threading allowing for both clamping and alignment functions in various assembly scenarios

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural steel connections, and industrial equipment where failure is not an option. The 1"-8 UNC coarse thread design provides superior resistance to vibration loosening while maintaining excellent clamp load distribution. The zinc yellow-chromate plated finish creates a protective barrier against corrosion in outdoor and industrial environments, significantly extending maintenance intervals. With partial threading, this fastener offers precise control over clamping force while allowing for alignment adjustments in complex assemblies. The combination of 150,000 psi tensile strength and Rockwell C33 hardness ensures reliable performance in construction, manufacturing, and infrastructure applications where high-strength fasteners are essential for structural integrity and safety.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit tolerance for consistent mating performance. The 1"-8 UNC coarse thread configuration follows standardized dimensions for compatibility across industrial applications. This product meets ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and mechanical properties compliance. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection while maintaining the fastener's structural integrity under demanding conditions.