S-91259A172 10-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 140,000 psi and minimum shear strength of 84,000 psi, this shoulder screw provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Thread Fit for Secure Assembly: Class 3A thread fit ensures tight, consistent engagement, minimizing backlash and vibration loosening in precision machinery and equipment.
• Enhanced Corrosion & Wear Resistance: The black oxide finish offers improved corrosion protection and reduced galling, extending service life in demanding industrial environments.
• Optimized for Easy Installation & Grip: The knurled socket head with hex drive allows for secure tool engagement and easy handling, speeding up assembly while preventing slippage.
• Durable Material & Hardness: Made from alloy steel with Rockwell C32 hardness, it maintains dimensional stability and resists deformation under heavy loads and repeated use.
• Accurate Shoulder for Component Alignment: The precisely toleranced shoulder diameter and length provide stable pivoting, spacing, or alignment of parts, ensuring smooth operation in assemblies.
• Compliance with Industry Standards: Meets ASTM A574 specifications and is RoHS 3 and REACH compliant, guaranteeing material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 10-32 UNF shoulder screw is engineered to address critical alignment and load-bearing challenges in precision industrial applications. The alloy steel construction, combined with a black oxide finish, provides superior resistance to corrosion and wear, making it ideal for machinery, automotive, and aerospace components where durability is paramount. The Class 3A thread fit and fine UNF thread spacing ensure secure, vibration-resistant fastening in assemblies requiring high accuracy. The knurled socket head with hex drive facilitates quick installation and removal, reducing downtime in maintenance-heavy environments. By offering a robust shoulder diameter and length with tight tolerances, this screw effectively acts as a pivot, spacer, or axle, preventing misalignment and enhancing the longevity of rotating or sliding mechanisms.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNF thread standards for precise engagement. Manufacturing follows ASTM A574 specifications, ensuring consistent quality and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use. Key dimensional tolerances include shoulder diameter (-0.004" to -0.002") and shoulder length (-0.005" to 0.005"), guaranteeing reliable fit in critical applications.