S-91465A113 5/16"-18 x 3/4" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external square drive design for secure installation and removal in demanding applications
• Excellent durability with steel construction and Rockwell B69 hardness to withstand mechanical stress and wear
• Reliable fastening performance with 60,000 psi tensile strength ASTM Grade A rating for structural integrity
• Wide compatibility with UNC coarse threading and Class 2A fit for quick assembly and interchangeability
• Full-length threading ensures maximum grip and load distribution across the entire fastener length
• Regulatory compliance with RoHS 3 and ASTM A307 specifications for safe, industry-approved usage
• Right-hand thread direction provides standardized installation familiar to industrial operators

Professional Applications & Engineering Value

This 5/16"-18 UNC Square Head Screw delivers critical engineering value through its steel construction and ASTM Grade A strength rating. The combination of coarse UNC threading and external square drive addresses common industrial challenges by enabling high-torque applications where vibration resistance and quick assembly are paramount. The fully threaded design ensures consistent clamping force across joints in machinery, construction, and heavy equipment applications. With 60,000 psi tensile strength and Rockwell B69 hardness, this fastener maintains integrity under static and dynamic loads, while the Class 2A thread fit guarantees reliable engagement without binding in high-volume production environments.

Specification Summary & Compliance

Manufactured to Unified Standard Class 2A thread tolerances with 5/16"-18 UNC coarse thread specifications. Complies with ASTM A307 manufacturing standards for Grade A fasteners and RoHS 3 (2015/863/EU) environmental directives. Features inch system measurements with 3/4" length and fully threaded configuration meeting industrial quality requirements.