S-90298A583 1/4"-20 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 Class 3A thread fit and tight shoulder diameter tolerance (±0.001")
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Secure installation and removal with knurled head and 5/32" hex socket drive preventing tool slippage
- Reliable dimensional consistency through full compliance with ASME B18.3 manufacturing specifications
- Environmental regulation compliance meeting RoHS 3 and REACH standards for global industrial use
- Optimized load distribution with 1" shoulder length providing stable bearing surface for rotating components
Professional Applications & Engineering Value
Engineered for precision machinery and industrial equipment, this 18-8 stainless steel shoulder screw solves critical alignment challenges in rotating assemblies. The 1/4"-20 UNC coarse thread combined with Class 3A thread fit ensures vibration-resistant fastening while maintaining precise concentricity. The passivated finish provides enhanced corrosion protection for demanding environments including manufacturing equipment, automotive assemblies, and precision instruments. The 1" shoulder length with minimal tolerance variation serves as an accurate axle or pivot point, eliminating the need for additional bushings in mechanical linkages, conveyor systems, and robotic arms. This integrated design reduces assembly time while improving operational reliability.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per UNC standards with shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". Manufacturing conforms to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial applications.
