S-91259A800 1/2"-13 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction and Rockwell C32 hardness, providing reliable performance under high-stress conditions.
• Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and reduced wear due to the knurled head and standard shoulder fit, ensuring stable component positioning.
• High load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength, suitable for demanding applications.
• Easy installation and removal using a 5/16" hex drive and coarse UNC threads, saving time and labor in assembly processes.
• Compliance with industry standards including ASME B18.3 and ASTM A574, guaranteeing consistent quality and interchangeability.
• Environmental and safety adherence through RoHS 3 and REACH compliance, supporting sustainable manufacturing practices.

Professional Applications & Engineering Value

This alloy steel shoulder screw with a black oxide finish is engineered to address critical challenges in machinery assembly, automation systems, and precision equipment. The 1/2"-13 UNC coarse thread and Class 3A fit ensure secure fastening with minimal risk of loosening under vibration, while the 1-3/4" shoulder length with tight tolerances provides accurate spacing and alignment for rotating parts like bearings or pulleys. The knurled head enhances grip during manual adjustments, reducing slippage. Ideal for industrial applications requiring high shear and tensile strength, this screw minimizes downtime and maintenance costs by resisting corrosion and wear, supported by its compliance with ASME B18.3 and material specifications.

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". It meets ASME B18.3 and ASTM A574 manufacturing specifications, ensuring reliability in mechanical systems. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industries without hazardous substances.