S-91465A101 1/4"-20 x 1" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external square drive design for reliable installation and removal in high-vibration environments
• Exceptional durability from ASTM Grade A steel construction with 60,000 psi tensile strength for demanding industrial applications
• Enhanced holding power through fully threaded design that maximizes engagement across the entire fastener length
• Precise thread compatibility with UNC coarse threading and Class 2A fit ensuring consistent performance in standard applications
• Optimized material performance with Rockwell B69 hardness balancing strength with appropriate ductility
• Regulatory compliance assurance meeting both ASTM A307 specifications and RoHS 3 environmental standards
• Reliable coarse thread performance providing excellent resistance to loosening in wood and soft material applications

Professional Applications & Engineering Value

This 1/4"-20 UNC square head screw delivers critical engineering solutions where traditional hex heads prove insufficient. The external square drive provides superior torque transmission, eliminating cam-out issues common in high-torque applications. Manufactured from ASTM Grade A steel with 60,000 psi tensile strength, this fastener maintains structural integrity under significant mechanical stress. The fully threaded design ensures maximum thread engagement throughout the entire 1" length, providing enhanced clamping force in wood construction, machinery assembly, and structural framing applications. The coarse UNC threading offers excellent pull-out resistance in softer materials while the Class 2A thread fit guarantees consistent performance across standard industrial applications.

Specification Summary & Compliance

This square head screw features precise Unified Standard Class 2A thread tolerances with 1/4"-20 UNC coarse threading and right-hand thread direction. Manufactured to ASTM A307 specifications for low-strength fasteners, it maintains dimensional accuracy across all critical parameters including head height (11/64") and head width (3/8"). The product is fully RoHS 3 (2015/863/EU) compliant and meets all relevant inch system measurement standards for industrial applications requiring reliable, environmentally conscious fastening solutions.