S-92620A878 3/4"-16 x 4 1/2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with a tensile strength of 150,000 psi, ensuring reliable performance in high-stress applications.
• Superior corrosion resistance from the zinc yellow-chromate plating, extending service life in harsh industrial environments.
• High hardness rating of Rockwell C33 provides excellent wear resistance and reduces thread deformation during installation.
• Precise Class 2A thread fit ensures smooth assembly and consistent clamping force in demanding applications.
• Full threading along the 4 1/2" length offers maximum grip and adjustability in thick materials.
• External hex drive design allows for high-torque installation with standard tools, speeding up assembly processes.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability in industrial systems.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to solve critical challenges in heavy machinery, structural steel connections, and high-vibration equipment. The 3/4"-16 UNF fine thread provides superior resistance to loosening under dynamic loads, while the zinc yellow-chromate plating protects against rust in outdoor or chemically aggressive settings. Its fully threaded design ensures uniform stress distribution, preventing joint failure in thick assembly stacks. Ideal for construction, automotive, and industrial manufacturing, this fastener delivers predictable performance where safety and durability are paramount.

Specification Summary & Compliance

Manufactured to Class 2A thread tolerance for precise fit, this screw adheres to UNF (Unified National Fine) thread standards. It meets ASME B18.2.1 dimensional requirements and SAE J429 material specifications for Grade 8 fasteners. The product conforms to RoHS and REACH environmental directives, ensuring safe use in regulated industries.