S-91286A804 1/2"-13 x 1 3/8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: Zinc-flake coating provides excellent protection against rust and environmental degradation, extending service life in harsh conditions.
• Precise Thread Engagement: UNC coarse threads with Class 2A fit offer easier assembly and consistent clamping force, minimizing cross-threading and improving installation efficiency.
• High Durability & Wear Resistance: Rockwell C33 hardness maintains structural integrity under repeated loads and vibrations, ensuring long-term fastener reliability.
• Optimized for Heavy-Duty Use: Fully threaded design and external hex drive allow for maximum grip and straightforward installation with common tools in industrial settings.
• Regulatory Compliance & Quality Assurance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, guaranteeing material safety and consistent manufacturing quality.
• Versatile Sizing for Robust Assemblies: 1/2"-13 thread size and 1 3/8" length provide strong, secure fastening in construction and machinery applications.

Professional Applications & Engineering Value

Engineered for demanding environments, these Grade 8 hex head screws address critical industrial challenges such as structural integrity and corrosion management. The steel construction with zinc-flake coating combats oxidation in outdoor or chemically exposed settings, while the UNC coarse thread and Class 2A fit enable quick, secure fastening without sacrificing strength. Ideal for heavy machinery, construction frameworks, and automotive assemblies, these fully threaded fasteners distribute stress evenly along the shaft, preventing loosening under dynamic loads. Their external hex drive design ensures compatibility with standard wrenches, streamlining maintenance and reducing downtime in production lines.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse threading with a 1/2"-13 size. It conforms to ASME B18.2.1 and SAE J429 specifications, ensuring mechanical reliability. Additionally, it is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.