S-91309A648 3/8"-16 x 6" 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 demanding 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
• Coarse UNC threads with Class 2A fit enable faster assembly and better debris resistance
• Full threading along the 6" length offers maximum grip and adjustment flexibility
• External hex drive design allows for high-torque installation with standard tools
• Compliance with ASME B18.2.1 and ASTM A307 guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

This 3/8"-16 UNC hex head screw is engineered to solve critical fastening challenges in industrial assembly, construction, and heavy machinery. The steel construction with zinc plating combats rust and corrosion in humid or outdoor environments, reducing maintenance costs. Its coarse thread design prevents cross-threading and allows quicker installation in structural applications, while the full threading ensures uniform stress distribution across the entire 6-inch length. The external hex drive facilitates secure tightening with common wrenches, making it ideal for high-vibration settings where 60,000 PSI tensile strength prevents joint failure. These features make it a preferred choice for heavy-duty fasteners in frameworks, equipment mounts, and load-bearing connections.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNC standards, ensuring precise dimensional accuracy and easy assembly. It is manufactured in compliance with ASME B18.2.1 and ASTM A307 specifications for mechanical properties and consistency. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.