S-97345A903 3/4"-10 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
• Precise assembly and alignment ensured by the Class 3A thread fit and standard shoulder, minimizing play and vibration.
• Easy installation and removal with a 1/2" hex socket drive and knurled head for enhanced grip, even with gloves.
• Long-term durability supported by Rockwell B79 hardness, resisting wear and deformation under stress.
• Broad industry compatibility due to compliance with ASME B18.3, RoHS 3, and REACH standards for safety and quality.
• Optimized for coarse threading (UNC) providing faster assembly and reduced cross-threading risks in high-volume production.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNC coarse thread and Class 3A fit ensure secure fastening with minimal tolerance deviation, reducing the risk of loosening under dynamic loads. The socket head with hex drive allows for high-torque installation in confined spaces, while the knurled texture enhances handling efficiency. Its high tensile and shear strength makes it suitable for applications like rotating shafts, pivots, and jigs, where alignment and durability are paramount. By combining corrosion-resistant material with strict dimensional accuracy, this screw delivers reliable performance in industries such as aerospace, automotive, and chemical processing, minimizing maintenance downtime and ensuring long-term operational integrity.

Specification Summary & Compliance

This shoulder screw features a 3/4"-10 UNC thread with Class 3A tolerance for precise fit, a shoulder diameter of 1" with tolerance from -0.004" to -0.002", and a shoulder length of 2 1/4" with tolerance from -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and suitable for global industrial use.