S-91465A137 3/8"-16 x 1 1/4" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Enhanced durability with ASTM Grade A steel construction providing reliable performance in demanding industrial environments
• Superior torque transmission through external square drive design for secure installation and reduced tool slippage
• Optimized thread engagement with 3/8"-16 UNC coarse threading ensuring faster assembly and better performance in softer materials
• Controlled holding power through partially threaded design that concentrates strength where needed most
• Precise fit and compatibility with Unified Standard Class 2A thread fit for consistent performance across applications
• Environmental responsibility with RoHS 3 compliance ensuring safe use in regulated industries
• Verified quality standards meeting ASTM A307 specifications for reliable mechanical properties

Professional Applications & Engineering Value

This 3/8"-16 UNC square head screw delivers exceptional engineering value through its ASTM Grade A steel composition and coarse thread design. The external square drive provides superior torque resistance during installation, preventing cam-out and ensuring secure fastening in heavy machinery, construction equipment, and structural applications. The partially threaded configuration concentrates the 60,000 psi tensile strength precisely where clamping force is needed, reducing stress concentration while maintaining joint integrity. With Rockwell B69 hardness, these industrial square head screws withstand vibration and dynamic loads common in manufacturing environments, while the Unified Standard Class 2A thread fit guarantees consistent performance across mating components. The 1 1/4" length provides optimal engagement depth for medium-duty applications requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This square head screw features precise Unified Standard Class 2A thread fit with 3/8"-16 UNC coarse threading and 1" minimum thread length. Manufactured to ASTM A307 specifications with ASTM Grade A steel material, it delivers 60,000 psi tensile strength and Rockwell B69 hardness. The fastener is RoHS 3 (2015/863/EU) compliant and meets all applicable environmental regulations for industrial use. The 1 1/4" overall length and partially threaded design ensure consistent performance across various applications while maintaining dimensional accuracy per industry standards.