S-91257A945 7/8"-14 x 6" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc yellow-chromate plating extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise UNF fine threading with Class 2A fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• Grade 8 steel construction with Rockwell C33 hardness offers excellent durability and wear resistance, ideal for heavy machinery and structural uses.
• Partially threaded design allows for optimal clamping force distribution, preventing joint loosening under dynamic loads.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability, streamlining procurement and installation.
• RoHS 3 and REACH compliance ensures environmental and safety adherence, supporting sustainable and regulated industrial operations.

Professional Applications & Engineering Value

This 7/8"-14 UNF Grade 8 hex head screw is engineered to address critical challenges in heavy-duty applications, such as construction equipment, automotive assemblies, and industrial machinery. The steel material combined with a zinc yellow-chromate finish provides robust protection against corrosion and abrasion, extending fastener lifespan in demanding conditions. The UNF fine thread and Class 2A fit ensure tight, reliable fastening that resists vibration-induced loosening, reducing downtime and maintenance. With a 150,000 psi tensile strength and Rockwell C33 hardness, it delivers consistent performance under extreme loads, making it a trusted choice for engineers prioritizing safety and durability in industrial fasteners.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to UNF fine threading standards with a thread size of 7/8"-14. It meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory alignment for global industrial use.