S-91251A699 9/16"-18 x 1 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish extends service life in demanding industrial environments.
• Precision Class 3A fine threads provide a tighter, more secure fit, minimizing loosening from vibrations.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Fully threaded design allows for uniform clamping force and flexibility in adjustment during assembly.
• Hex socket drive enables easy installation and removal with standard tools, even in confined spaces.
• Compliance with ASTM A574 and environmental regulations guarantees consistent quality and safe use in regulated industries.

Professional Applications & Engineering Value

Engineered for high-performance assemblies, these Black-Oxide Alloy Steel Socket Head Cap Screws address critical challenges in machinery, automotive, and heavy equipment sectors. The Class 3A UNF fine thread configuration ensures minimal backlash and superior load distribution, ideal for applications requiring precise alignment and vibration resistance. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme operational stresses without deformation. The black-oxide surface treatment provides a durable barrier against rust and corrosion, extending maintenance intervals in humid or corrosive environments. These screws are perfect for securing critical components where reliability and compliance with ASTM A574 standards are non-negotiable.

Specification Summary & Compliance

This 9/16"-18 UNF Socket Head Cap Screw features precise Class 3A thread fit and fine thread spacing for accurate engagement. It adheres to ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in environmentally sensitive applications. With a length of 1 3/4" and fully threaded design, it meets rigorous industrial demands for durability and performance.