S-91259A495 6-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Strength & Durability: With 140,000 psi tensile and 84,000 psi shear strength, this screw withstands high-stress applications, reducing the risk of fastener failure and equipment downtime.
• Precision Thread Fit for Secure Assembly: Class 3A thread fit ensures tight, reliable engagement with mating parts, minimizing backlash and improving the overall stability of your assembly.
• Corrosion-Resistant Black Oxide Finish: The black oxide coating provides a durable layer of protection against rust and corrosion, extending the service life of the screw in demanding industrial environments.
• High-Strength Alloy Steel Construction: Made from alloy steel and hardened to Rockwell C32, this screw offers superior wear resistance and maintains its integrity under repetitive loads and vibrations.
• Convenient Hex Socket Drive: The 3/32" hex drive allows for easy installation and removal with standard tools, facilitating faster assembly and maintenance cycles.
• Standardized UNC Coarse Threading: The 6-32 UNC coarse thread is designed for quick assembly and provides excellent holding power in a wide range of materials, streamlining your production process.
• Compliant with Major Industry Standards: Meets ASTM A574 for material consistency and is RoHS 3 and REACH compliant, ensuring safety and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The 1-inch shoulder length provides a precise pivot or bearing surface, essential for applications like linkages, gears, and rotating assemblies where alignment and minimal radial play are paramount. The black oxide finish not only enhances corrosion resistance but also reduces galling during installation. With its UNC coarse threading and Class 3A fit, it ensures rapid, secure fastening in high-vibration environments, preventing loosening and maintaining operational integrity. The combination of high tensile strength and a socket head design makes it ideal for confined spaces, offering reliable performance in automotive, aerospace, and heavy machinery applications where durability and precision are non-negotiable.

Specification Summary & Compliance

This shoulder screw features a 6-32 UNC thread with a Class 3A fit for precise thread engagement. The shoulder diameter tolerance is -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured in compliance with ASTM A574 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, guaranteeing material quality and regulatory adherence for industrial use.