S-91257A990 1"-14 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capacity with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
• Superior corrosion resistance through zinc yellow-chromate plating that withstands harsh industrial environments
• Precise thread engagement with Class 2A thread fit and extra fine 1"-14 UNS threading for vibration-resistant connections
• Optimized strength-to-weight ratio through partial threading design that concentrates material where needed most
• Exceptional durability backed by Rockwell C33 hardness for long-term performance under heavy loads
• Easy installation and removal with standard 1 1/2" external hex head design compatible with common tools
• Reliable standardization meeting ASME B18.2.1 and SAE J429 specifications for consistent quality and interchangeability

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver exceptional engineering value in demanding industrial environments where failure is not an option. The extra fine 1"-14 thread configuration provides superior resistance to vibration loosening, making them ideal for heavy machinery, structural steel connections, and high-pressure equipment. The zinc yellow-chromate plating creates a robust barrier against corrosion while maintaining dimensional stability. With partial threading concentrating the fastener's strength in critical engagement zones, these screws eliminate unnecessary material while maintaining full 150,000 psi tensile strength capabilities. The combination of Rockwell C33 hardness and precise Class 2A thread fit ensures reliable performance in applications ranging from construction equipment to industrial manufacturing systems where precise clamping force and durability are paramount.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit tolerance for consistent engagement and UNS extra fine thread specifications. These 5-inch hex head screws feature precise dimensional compliance with 1"-14 thread spacing and 2 1/4" minimum thread length. Fully compliant with ASME B18.2.1 and SAE J429 manufacturing specifications, ensuring interchangeability and reliability across industrial applications. The inch system measurement and standardized external hex drive design provide compatibility with existing tooling and equipment while maintaining the rigorous quality standards required for Grade 8 heavy-duty fasteners.