S-97768A494 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction and Black Oxide finish, ideal for harsh industrial environments.
• Superior torque transmission via the knurled socket head and 5/16" hex drive, preventing tool slippage during installation.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding heavy-duty applications.
• Precise alignment and pivot function with a 2-1/2" shoulder and standard fit, ensuring accurate component positioning.
• Reliable coarse threading with 1/2"-13 UNC and Class 3A fit for quick assembly and secure fastening in various materials.
• Consistent hardness rated at Rockwell B55, providing durability and wear resistance over repeated use.
• Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for safe, quality-assured integration.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load-bearing challenges in machinery and equipment. The 18-8 Stainless Steel material, enhanced with a Black Oxide finish, combats corrosion in humid or chemical-exposed settings, extending service life. The 2-1/2" shoulder length acts as a precise spacer or pivot in assemblies like rotating shafts, bearings, and linkages, reducing wear and misalignment. With a 1/2"-13 UNC coarse thread and Class 3A fit, it ensures rapid, secure fastening even in high-vibration environments. The knurled socket head and hex drive enable efficient torque application, minimizing installation time and tool damage. Ideal for industrial automation, automotive, and heavy machinery, this fastener delivers reliability where precision and strength are paramount.

Specification Summary & Compliance

The screw features a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002" with length tolerance of -0.005" to 0.005", ensuring dimensional accuracy. It adheres to ASME B18.3 specifications for consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.