S-91259A802 1/2"-13 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications.
• Enhanced corrosion resistance through the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and reduced wear due to the 2" precision shoulder with tight diameter tolerance, ensuring stable component positioning.
• Secure and efficient installation with the knurled socket head and 5/16" hex drive, preventing tool slippage during assembly.
• Consistent thread engagement provided by the Class 3A fit and 1/2"-13 UNC coarse threads, reducing the risk of cross-threading.
• High durability and hardness from alloy steel with Rockwell C32, maintaining integrity under repetitive loads.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical challenges in industrial machinery, such as misalignment and component wear. The alloy steel construction, combined with a black oxide finish, offers robust resistance to corrosion and mechanical stress, making it ideal for heavy-duty applications like automotive assemblies, conveyor systems, and precision equipment. The 2" precision shoulder with controlled tolerances ensures accurate shaft alignment, reducing vibration and extending the lifespan of moving parts. Its UNC coarse threads and Class 3A fit facilitate quick, reliable fastening in high-vibration environments, while the knurled socket head enhances grip for secure installation. By meeting stringent standards, this screw delivers consistent performance in demanding engineering scenarios, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.