S-90298A205 4-40 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
- Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Precise component alignment through controlled shoulder diameter tolerance (±0.001") and length tolerance (±0.005")
- Superior thread reliability with Class 3A UNC coarse threads ensuring secure fastening in high-vibration applications
- High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding loads
- Easy installation and removal with hex socket drive design requiring only 5/64" Allen key access
- Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
- Optimized for precision machinery with smooth shoulder surface reducing wear on rotating components
Professional Applications & Engineering Value
This stainless steel shoulder screw solves critical alignment challenges in precision assemblies where rotational accuracy and dimensional stability are paramount. The 4-40 UNC Class 3A thread with coarse pitch provides rapid installation while maintaining vibration resistance in automated equipment, CNC machinery, and optical instruments. The 1/2" shoulder length with tight tolerances acts as a precise pivot point or spacer, eliminating misalignment in bearings, gears, and linkages. The passivated finish enhances the inherent corrosion resistance of 18-8 stainless steel, making these socket head shoulder screws suitable for medical devices, food processing equipment, and marine applications where moisture and chemicals are present.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for superior engagement. Shoulder diameter maintained within -0.001" to 0.001" tolerance and shoulder length controlled to -0.005" to 0.005" tolerance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Right-hand UNC coarse threads ensure compatibility with standard industrial components.
