S-90298A815 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
• Precise alignment and smooth rotation ensured by the 5 1/2" shoulder with tight diameter tolerance for reduced wear on mating parts
• Secure, high-precision threading via Class 3A UNC coarse threads for reliable fastening and vibration resistance
• Easy installation and removal with hex socket drive and knurled head for improved grip and torque application
• Long-term reliability backed by Rockwell B55 hardness for consistent performance under stress
• Regulatory compliance meeting ASME B18.3 standards and RoHS/REACH for safe, industry-approved use

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and load challenges in precision industrial applications. The 18-8 Stainless Steel material provides excellent corrosion resistance, making it suitable for machinery exposed to moisture, chemicals, or outdoor conditions. The 5 1/2" shoulder length acts as a precise pivot or axle, reducing friction and wear in assemblies like rotating shafts, linkages, and jigs. With 1/2"-13 UNC Class 3A threads, it ensures a tight, secure fit that withstands vibrations and heavy loads, common in automotive, aerospace, and manufacturing equipment. The hex drive and knurled head enhance installation efficiency, minimizing tool slippage and assembly time. This design solves common issues of misalignment and part failure, delivering durability and precision for high-stress environments.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with Class 3A thread fit for high precision and UNC coarse threading (1/2"-13). The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring exact dimensional accuracy. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for industrial use.