S-92620A851 3/4"-10 x 4" 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, ideal for high-stress structural connections.
• Superior corrosion resistance due to zinc yellow-chromate plating, extending service life in harsh environments.
• High hardness rating (Rockwell C33) ensures excellent wear resistance and reduced thread deformation.
• Reliable coarse threading (3/4"-10 UNC) provides faster assembly and better performance in materials prone to galling.
• Precise Class 2A thread fit guarantees consistent engagement and reduces cross-threading risks.
• Full threading along the 4" length offers versatile positioning and maximum grip in deep applications.
• Compliance with major industry standards including ASME B18.2.1 and SAE J429 ensures interoperability and safety.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered for demanding industrial applications where failure is not an option. The steel construction combined with zinc yellow-chromate plating provides a robust barrier against rust and chemical exposure, making it suitable for outdoor machinery, construction equipment, and automotive assemblies. The coarse UNC thread and external hex drive allow for quick installation with standard tools, reducing labor time in high-volume production. Its 150,000 psi tensile strength and Rockwell C33 hardness ensure it maintains clamp load under extreme vibration and dynamic loads, preventing joint loosening in critical infrastructure projects.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances and UNC coarse thread standards for consistent performance. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.