S-90298A845 5/8"-11 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish for extended service life in harsh environments.
- Precise component alignment ensured by a shoulder with a tight diameter tolerance of ±0.001" and standard fit.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
- Secure, high-precision threading via Class 3A UNC coarse threads for reliable fastening and vibration resistance.
- Easy installation and removal with a hex socket drive and knurled head for improved grip and torque application.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use.
- Dimensional stability with controlled shoulder length tolerance (±0.005") for consistent assembly in precision machinery.
Professional Applications & Engineering Value
This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in precision industrial applications. The 18-8 stainless steel construction, enhanced by a passivated finish, provides excellent resistance to corrosion and wear, making it ideal for machinery exposed to moisture, chemicals, or frequent sterilization. The Class 3A thread fit and coarse UNC threading ensure secure, vibration-resistant fastening in high-stress assemblies, such as rotating shafts, pivots, and jigs. The precisely machined shoulder with minimal diameter and length tolerances allows for exact positioning of components, reducing misalignment and improving overall equipment reliability. Its hex drive and knurled head facilitate easy handling and torque control, streamlining maintenance and reducing downtime in automated systems.
Specification Summary & Compliance
This shoulder screw adheres to inch system measurements with a Class 3A thread fit and UNC coarse thread specifications. It meets the dimensional and mechanical requirements of ASME B18.3 and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for use in regulated industries worldwide.
