S-91259A165 8-32 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 industrial applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: The black oxide finish offers enhanced protection against rust and wear, extending the screw's service life in harsh environments and minimizing maintenance needs.
• Precision Fit and Alignment: Featuring a Class 3A thread fit and standardized shoulder dimensions, it ensures accurate assembly and smooth rotation in machinery, reducing wear on mating components.
• High Durability and Hardness: Made from alloy steel with a Rockwell C32 hardness, it resists deformation under heavy loads, maintaining structural integrity in demanding applications like pivots and axles.
• Easy Installation and Removal: The socket head with hex drive (3/32") allows for quick, secure tightening using standard tools, speeding up assembly processes and reducing labor time.
• Broad Compliance and Reliability: Meets ASTM A574 specifications, RoHS 3, and REACH standards, ensuring material safety and consistency for global industrial use without regulatory concerns.
• Optimized for Coarse Thread Applications: The 8-32 UNC coarse thread design facilitates faster installation and better grip in softer materials, enhancing efficiency in production lines.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and component wear. The 3/16" shoulder length and smooth texture provide a stable bearing surface for rotating parts, reducing friction and extending the life of assemblies in applications like pivots, linkages, and electrical enclosures. The black oxide finish adds a layer of corrosion resistance, ideal for environments exposed to moisture or chemicals. With its UNC coarse thread and Class 3A fit, it ensures tight tolerances and reliable fastening in high-vibration settings, from automotive systems to industrial equipment. By combining high tensile and shear strength, it minimizes the risk of loosening or failure, delivering consistent performance in heavy-duty fastening scenarios where durability is critical.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASTM A574 for material and manufacturing quality, ensuring consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for use in various industries.