S-91251A554 1/4"-20 x 3" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress industrial environments
• Precise Class 3A thread fit ensures superior engagement and vibration resistance in demanding applications
• Black-oxide alloy steel construction provides enhanced corrosion resistance and durability
• Rockwell C37 hardness rating maintains structural integrity under heavy loads and repeated use
• Partially threaded design allows for optimal clamping force distribution and easier assembly
• Hex socket drive enables high-torque installation in confined spaces with standard tools
• Compliance with ASTM A574 guarantees consistent quality and performance standards

Professional Applications & Engineering Value

Engineered for precision machinery and heavy-duty equipment, these socket head cap screws deliver exceptional reliability where failure is not an option. The black-oxide alloy steel construction provides superior protection against corrosion while maintaining the high tensile strength required for structural applications. The Class 3A thread fit and UNRC coarse thread design ensure secure fastening in vibrating environments, preventing loosening in automotive, aerospace, and industrial manufacturing applications. The partially threaded configuration allows for precise clamping control, while the hex socket drive facilitates installation in space-constrained assemblies where wrench clearance is limited.

Specification Summary & Compliance

This 1/4"-20 x 3" socket head cap screw features precision Class 3A thread fit with UNRC coarse threads and right-hand thread direction. Manufactured to ASTM A574 specifications with Rockwell C37 hardness and 170,000 psi tensile strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.