S-91259A230 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability and Strength: Crafted from high-grade alloy steel with a tensile strength of 140,000 psi and shear strength of 84,000 psi, ensuring reliable performance in demanding applications.
• Superior Corrosion Resistance: Black oxide finish provides excellent protection against rust and wear, extending the screw's service life in harsh environments.
• Precision Thread Fit: Class 3A thread fit with 5/8"-11 UNC coarse threads offers secure, vibration-resistant fastening for critical assemblies.
• Easy Installation and Removal: Socket head with 3/8" hex drive and knurled texture allows for quick, slip-resistant tightening using standard tools.
• Accurate Shoulder Dimensions: Tight tolerances on shoulder diameter and length ensure consistent alignment and smooth operation in precision mounting setups.
• High Hardness for Wear Resistance: Rockwell C32 hardness minimizes deformation under load, maintaining structural integrity over repeated use.
• Compliance with Industry Standards: Meets ASME B18.3, RoHS 3, and REACH regulations, guaranteeing safety and environmental responsibility for global projects.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common industrial challenges, such as misalignment and component wear in machinery. The 5/8"-11 UNC coarse threads and Class 3A thread fit provide a robust, vibration-resistant connection, ideal for high-stress environments like automotive assemblies, conveyor systems, and precision tooling. The black oxide finish enhances corrosion resistance, reducing maintenance needs in humid or corrosive settings. With a knurled head and socket drive, it ensures easy installation without slippage, saving time during assembly. Its high tensile and shear strength makes it suitable for heavy-duty applications, offering long-term reliability and reducing downtime in manufacturing and engineering projects.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit and UNC thread type for consistent performance. Shoulder diameter and length tolerances are tightly controlled to ensure accuracy in mounting. It complies with ASME B18.3 manufacturing specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and safety-focused industrial use.