S-91236A637 3/8"-16 x 3 1/4" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in harsh industrial environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
• Rockwell B69 hardness provides excellent durability and resistance to wear and deformation
• External hex drive design allows for easy installation and removal with standard tools
• Coarse UNC threads with Class 2A fit enable quick assembly and secure fastening in various materials
• Partial threading offers optimal grip and clamping force for specific industrial applications
• Compliance with ASME B18.2.1 and environmental regulations guarantees quality and safety for professional use

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered to address common industrial fastening challenges, combining steel material with zinc plating for enhanced corrosion resistance in demanding environments like machinery assembly, construction, and automotive applications. The coarse thread design ensures rapid installation and reliable holding power, while the external hex drive facilitates efficient torque application with standard wrenches. Its partial threading minimizes stress concentration, making it ideal for joints requiring precise clamping force. With a Rockwell B69 hardness and 60,000 psi tensile strength, it withstands heavy loads and vibrations, reducing maintenance needs and downtime in industrial hex bolt applications.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for consistent performance and meets ASME B18.2.1 specifications under ASTM A307. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.