S-91309A635 3/8"-16 x 2 3/4" 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 demanding environments
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads
• Rockwell B69 hardness provides excellent durability and resistance to wear
• Class 2A thread fit offers consistent, easy assembly and interchangeability
• Coarse UNC threading enables quick installation and reduced cross-threading risks
• Fully threaded design delivers maximum grip and holding power across the entire length
• External hex drive allows for high-torque application with standard tools

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 3/8"-16 UNC hex head screws provide exceptional reliability in construction, machinery, and structural assemblies. The steel material with zinc plating combats rust and corrosion, making them ideal for environments exposed to moisture or chemicals. Their coarse thread design ensures secure fastening in softer materials and reduces installation time, while the Class 2A thread fit guarantees precise alignment and reduces the risk of stripping. With full threading and external hex drive, they offer superior clamping force and are easily installed with common wrenches, minimizing downtime in production and maintenance cycles.

Specification Summary & Compliance

This hex head screw features a 3/8"-16 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It complies with ASME B18.2.1 and ASTM A307 specifications, ensuring consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various industries.