S-91259A161 6-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Crafted from high-strength alloy steel with a black oxide finish, providing superior corrosion resistance and longevity in harsh industrial environments.
• Precision Thread Fit: Features Class 3A thread fit with 6-32 UNC coarse threads, ensuring reliable, vibration-resistant connections and reducing the risk of loosening.
• High Load Capacity: Delivers a tensile strength of 140,000 psi and a minimum shear strength of 84,000 psi, offering dependable performance under heavy mechanical stress.
• Easy Installation & Removal: Hex socket drive (3/32") allows for straightforward tightening with standard tools, minimizing assembly time and effort.
• Consistent Shoulder Dimensions: Precision-machined shoulder with tight diameter and length tolerances ensures accurate alignment and smooth rotation in pivot or spacer applications.
• Broad Compliance: Meets ASTM A574 specifications and is RoHS 3 and REACH compliant, guaranteeing safety and environmental standards for global supply chains.
• Optimized for Demanding Use: Rockwell C32 hardness and robust construction make it ideal for repetitive, high-stress applications without compromising integrity.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in machinery assembly, automation, and precision equipment. The black oxide finish enhances corrosion resistance, extending service life in humid or abrasive conditions. With 6-32 UNC coarse threads and a Class 3A thread fit, it provides secure fastening that resists loosening from vibrations, common in motors and conveyor systems. The smooth, standard socket head profile facilitates easy access in confined spaces, while the precisely machined shoulder ensures accurate component alignment—essential for reducing wear in bearings, gears, and linkages. Ideal for industrial applications like robotics, automotive fixtures, and electronic enclosures, it combines high tensile strength and shear strength to handle dynamic loads, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to strict dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring precision in fit and function. It conforms to ASTM A574 standards for socket head cap screws, with threads meeting UNC coarse thread specifications and a Class 3A thread fit for superior engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing and safe usage across various sectors.