S-97345A863 5/8"-11 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.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding, high-stress applications.
• Precision alignment and reduced wear enabled by the 3/4" diameter shoulder with controlled tolerances for accurate component location.
• Reliable, high-quality thread engagement with Class 3A fit and coarse UNC threads for secure fastening and vibration resistance.
• Easy installation and removal using a standard 3/8" hex key drive combined with a knurled socket head for improved grip.
• Compliance with major industry standards including ASME B18.3, ensuring dimensional consistency and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 316 Stainless Steel material provides excellent resistance to corrosion from chemicals, saltwater, and atmospheric exposure, making it suitable for food processing, marine, and chemical equipment. The precision-machined shoulder acts as a bearing surface or pivot point, minimizing wear on mating parts and maintaining exact positioning in assemblies like rotating machinery, pulleys, and linkages. The coarse UNC thread and Class 3A fit ensure a tight, reliable connection that withstands vibrations and dynamic loads, while the socket head with knurling allows for secure tool engagement in confined spaces. This combination of high tensile strength and precise geometry delivers long-term reliability, reducing maintenance downtime and replacement costs in heavy-duty engineering systems.

Specification Summary & Compliance

This shoulder screw features a 5/8"-11 UNC thread with a Class 3A fit for high-precision assembly. The shoulder diameter is 3/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 3/4" with a tolerance of -0.005" to 0.005", ensuring dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming its suitability for regulated industrial and international markets.