S-90337A388 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
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Precise component alignment enabled by the 3/4" shoulder with minimal diameter tolerance (-0.001" to 0") for reduced vibration and wear
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
- Space-saving low-profile socket head with 5/64" hex drive for secure tightening in confined spaces
- Consistent thread engagement through Class 2A UNC coarse threads ensuring reliable fastening in right-hand applications
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use
- Optimized shoulder fit providing stable bearing surface for rotating components and precise assemblies
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw addresses critical alignment challenges in precision machinery and industrial equipment. The 18-8 stainless steel construction with passivated finish provides superior corrosion resistance, extending service life in demanding environments. The low-profile socket head design allows for compact assembly configurations while maintaining full hex drive functionality. The precisely machined 3/4" shoulder length with tight diameter tolerance serves as an accurate pivot point or locating dowel for rotating components, reducing eccentric wear and maintaining alignment in automated systems, manufacturing jigs, and precision instruments. The Class 2A thread fit ensures consistent engagement while the coarse UNC threads provide rapid assembly in production environments.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC thread specifications. The shoulder features tight diameter tolerance (-0.001" to 0") and length tolerance (0" to 0.002") for precision applications. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial distribution and use.
