S-97345A574 1/4"-28 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 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
- Precise component alignment through the 3/8" shoulder diameter with tight tolerance control for reduced assembly vibration
- High-load bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
- Secure torque transmission via knurled socket head and 3/16" hex drive, preventing tool slippage during installation
- Fine-thread engagement with Class 3A UNF 1/4"-28 threads ensuring vibration resistance and superior clamping force
- Regulatory compliance meeting ASME B18.3 standards and environmental directives (RoHS 3, REACH) for global supply chain integration
- Optimized hardness profile at Rockwell B79 providing excellent wear resistance while maintaining ductility
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw addresses critical alignment and corrosion challenges in precision assemblies. The knurled socket head combined with 3/16" hex drive ensures secure fastening in high-vibration environments, while the Class 3A UNF fine threads maintain clamping force under dynamic loads. The precisely machined shoulder provides stable bearing surfaces for rotating components in machinery, automotive, and aerospace applications. With 70,000 psi tensile strength and full RoHS 3/REACH compliance, it delivers reliable performance in medical equipment, marine hardware, and chemical processing systems where material integrity and regulatory adherence are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. Shoulder diameter tolerance maintained at -0.004" to -0.002" with shoulder length tolerance of ±0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. Thread system follows UNF 1/4"-28 fine thread standards with right-hand orientation. Material certification includes 316 stainless steel with Rockwell B79 hardness verification.
