S-91465A104 1/4"-20 x 1 1/4" 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
• Enhanced durability through ASTM Grade A steel construction with 60,000 psi tensile strength and Rockwell B69 hardness
• Reliable coarse threading (UNC 1/4"-20) provides excellent engagement and vibration resistance in various materials
• Precision thread fit meeting Unified Standard Class 2A ensures consistent performance and interchangeability
• Optimized partial threading allows for controlled clamping force and secure fastening in assembly operations
• Environmental compliance with RoHS 3 standards for safe use in regulated industries and applications
• Right-hand thread design enables standard installation procedures and compatibility with common tools

Professional Applications & Engineering Value

This 1/4"-20 UNC square head screw delivers exceptional performance in industrial fastening applications where reliability is critical. The ASTM A307 Grade A steel construction provides the necessary 60,000 psi tensile strength for structural connections, machinery assembly, and equipment maintenance. The coarse thread design ensures rapid installation and superior holding power in wood, metal, and composite materials, while the square head configuration allows for high-torque application without stripping. The partial threading offers precise clamping control, making it ideal for applications requiring specific grip lengths. With Rockwell B69 hardness and external square drive, these screws withstand repetitive use and harsh environmental conditions in construction, manufacturing, and maintenance operations.

Specification Summary & Compliance

This square head screw features 1/4"-20 UNC coarse threads with Class 2A thread fit per unified standards, ensuring dimensional accuracy and interchangeability. The fastener meets ASTM A307 specifications for low carbon steel bolts and demonstrates 60,000 psi tensile strength with Rockwell B69 hardness. Manufacturing compliance includes RoHS 3 (2015/863/EU) standards for environmental safety. The 1-1/4" length with 3/4" minimum thread length and right-hand threading follows inch system measurements for consistent performance across industrial applications.