S-90298A587 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Precise alignment and secure positioning thanks to the 1-1/2" shoulder with tight diameter tolerance of -0.001" to 0.001"
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Reliable thread engagement ensured by Class 3A fit and coarse 1/4"-20 UNC thread for vibration resistance
- Easy installation and removal with hex socket drive (5/32") and knurled head for improved grip
- Industry-standard compliance meeting ASME B18.3 specifications for consistent performance and interchangeability
- Environmental regulation adherence with RoHS 3 and REACH compliance for global supply chain suitability
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to solve critical alignment challenges in precision machinery, automation systems, and rotating assemblies. The substantial 1-1/2" shoulder length provides stable bearing surfaces for gears, pulleys, and linkages, eliminating misalignment issues that cause premature wear. The Class 3A thread fit and coarse UNC threading maintain secure fastening under vibration, while the passivated finish extends service life in corrosive environments. With its knurled socket head and hex drive, technicians can achieve proper torque without slippage, making it ideal for maintenance-critical applications where reliability is paramount.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". Manufacturing follows ASME B18.3 specifications for dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance.
