S-97345A743 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• High tensile and shear strength (70,000 psi tensile, 35,000 psi shear) ensures reliable performance under heavy loads and stress.
• Precision Class 3A thread fit for secure, vibration-resistant assemblies and consistent mating with threaded components.
• Knurled socket head with 5/16" hex drive provides excellent grip and torque application, reducing tool slippage during installation.
• Accurate shoulder diameter and length with tight tolerances for precise alignment and spacing in rotating or sliding applications.
• Compliance with ASME B18.3 standards guarantees dimensional consistency and interchangeability in professional machinery and equipment.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global industrial supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial applications where precision, strength, and corrosion resistance are paramount. The 1/2"-13 UNC coarse thread with Class 3A fit ensures fast, secure engagement in assemblies, minimizing the risk of cross-threading and enhancing vibration resistance. The 5/8" shoulder diameter and controlled length provide stable alignment for rotating parts, such as in machinery bushings, pivots, and gear assemblies, reducing wear and maintenance needs. Made from 316 stainless steel, it offers excellent durability against chemicals, moisture, and high temperatures, making it suitable for marine, chemical processing, and food equipment. The knurled socket head with a hex drive allows for efficient installation in confined spaces, improving assembly speed and reliability in automated or manual settings.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances for reliable threading. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/2" with a tolerance of -0.005" to 0.005" for consistent alignment. It complies with ASME B18.3 specifications for dimensional standards, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental and health safety.