S-91465A107 1/4"-20 x 1 1/2" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Enhanced torque application with external square drive design for secure installation and removal in high-vibration environments
• Reliable low-strength performance with ASTM Grade A steel construction maintaining 60,000 psi tensile strength for general purpose applications
• Optimized thread engagement through UNC coarse threading providing faster assembly and reduced cross-threading risk
• Precise fit assurance with Unified Standard Class 2A thread fit ensuring consistent performance across industrial applications
• Durable material properties featuring Rockwell B69 hardness for balanced strength and machinability in demanding conditions
• Versatile partial threading allowing unthreaded shank sections for shear resistance and precise clamping control
• Environmental compliance with RoHS 3 (2015/863/EU) standards meeting international regulatory requirements

Professional Applications & Engineering Value

Engineered for industrial machinery assembly and structural fastening applications, this 1/4"-20 UNC square head screw delivers exceptional value through its ASTM A307 Grade A steel composition and coarse thread design. The external square drive provides superior torque transmission compared to standard hex heads, preventing tool slippage during high-torque applications. The partially threaded configuration allows the unthreaded shank to bear against mating surfaces, distributing clamp load efficiently while the right-hand coarse threads enable rapid installation in wood, metal, and composite materials. With 60,000 psi tensile strength and Rockwell B69 hardness, this fastener maintains structural integrity in vibration-prone environments common in construction equipment, agricultural machinery, and heavy-duty manufacturing applications.

Specification Summary & Compliance

This square head screw features precise Unified Standard Class 2A thread tolerances with 1/4"-20 UNC coarse thread specifications and 1 1/2" length dimension. Manufactured to ASTM A307 specifications for low-strength applications, the fastener ensures consistent performance across industrial implementations. Compliance includes RoHS 3 (2015/863/EU) environmental standards, meeting international regulatory requirements for hazardous substance restrictions while maintaining the mechanical properties necessary for reliable fastening solutions in various industrial sectors.