S-92620A749 1/2"-20 x 2 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 classification, providing 150,000 psi tensile strength for reliable performance in high-stress environments.
• Superior corrosion resistance due to zinc yellow-chromate plating, extending service life in harsh or outdoor industrial settings.
• Precise thread engagement with Class 2A thread fit and UNF fine threading, ensuring secure, vibration-resistant connections.
• Easy installation and removal featuring an external hex drive and 3/4" head width for straightforward tool access and high torque application.
• Full threading along the 2 1/2" length allows for adjustable fastening depth and consistent clamping force across applications.
• High hardness rating of Rockwell C33 minimizes wear and deformation, maintaining integrity under repeated loads.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, guaranteeing interchangeability and quality assurance.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and corrosion resistance are paramount. The zinc yellow-chromate plating provides a robust barrier against rust and chemical exposure, ideal for outdoor or humid environments. With a 1/2"-20 UNF fine thread and Class 2A fit, it ensures tight, secure fastening that resists loosening under vibration, reducing maintenance needs. The fully threaded design and external hex drive facilitate quick installation in tight spaces, enhancing efficiency in industrial maintenance and production lines. Built to ASME B18.2.1/SAE J429 specifications, it delivers consistent performance for structural connections, equipment frames, and high-load components.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNF fine threading with 1/2"-20 size. It meets ASME B18.2.1 and SAE J429 specifications for material and mechanical properties, ensuring reliability in industrial applications. The zinc yellow-chromate finish complies with RoHS and REACH directives for environmental safety, while the Grade 8 strength rating (150,000 psi tensile, Rockwell C33 hardness) confirms its suitability for heavy-duty use.