S-90337A163 4-40 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 long-lasting performance in harsh environments
- Precise component alignment ensured by the precisely machined 1/8" diameter shoulder with tight tolerances for reduced assembly errors
- High-strength reliability delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications
- Space-saving low-profile design with smooth socket head allowing flush mounting in confined spaces
- Consistent thread engagement through UNC coarse threading and Class 2A fit for rapid, secure fastening
- Easy installation and maintenance with standard 5/64" hex drive enabling quick tool access and torque application
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global supply chain integration
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw solves critical alignment and corrosion challenges in precision assemblies. The 18-8 Stainless Steel construction with passivated finish prevents galvanic corrosion in electrical enclosures and marine components, while the low profile socket head maintains aerodynamic surfaces in robotics and automotive subsystems. Engineers leverage the precise shoulder diameter and length tolerances for accurate bearing retention and rotational part positioning, eliminating shimming in conveyor systems and optical equipment. The Class 2A thread fit combined with coarse thread spacing ensures vibration-resistant connections in automated machinery, reducing maintenance cycles and production downtime.
Specification Summary & Compliance
Manufactured to exacting standards with Class 2A thread fit per UNC specifications, featuring precise shoulder dimensions (1/8" diameter with -0.001" to 0" tolerance; 1/8" length with 0" to 0.002" tolerance). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety in industrial applications.
