S-91257A662 3/8"-24 x 2 3/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with a tensile strength of 150,000 PSI and Grade 8 classification, ensuring reliable performance under high stress.
• Superior corrosion resistance due to the zinc yellow-chromate plating, which extends service life in harsh industrial environments.
• Precise and secure fastening with UNF fine threading and Class 2A thread fit, reducing the risk of loosening in vibration-prone settings.
• Easy installation and removal using a standard external hex drive and hex head design, compatible with common tools for efficient maintenance.
• Optimized load distribution from the partially threaded design, minimizing stress concentration and enhancing joint integrity.
• High durability and wear resistance backed by Rockwell C33 hardness, ideal for repetitive use in heavy machinery and equipment.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring consistent quality and interchangeability.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy-duty industrial applications, such as construction machinery, automotive assemblies, and structural frameworks. The steel construction with zinc yellow-chromate plating provides robust protection against corrosion, reducing maintenance costs and downtime in corrosive settings. Its UNF fine threading and Class 2A thread fit deliver precise engagement, preventing thread stripping and ensuring vibration resistance in dynamic environments. With a high tensile strength of 150,000 PSI and Rockwell C33 hardness, it withstands extreme loads and impacts, making it a reliable choice for applications requiring long-term fastening integrity and safety.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit for consistent dimensional accuracy and features UNF fine threading with a size of 3/8"-24. Manufactured in compliance with ASME B18.2.1 and SAE J429 standards, it ensures reliable performance and interchangeability. Additionally, it meets environmental regulations, including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting sustainable and safe usage in various industries.