S-99154A402 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 construction, ideal for harsh industrial environments
- Precise component alignment ensured by the 1/8" shoulder diameter with tight tolerance for reduced assembly play
- Reliable thread engagement with Class 2A UNC coarse threads for quick installation and vibration resistance
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for durable performance
- Low-profile socket head design allows for compact installations and easy driving in confined spaces
- Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
- Consistent dimensional accuracy with precise shoulder length and diameter tolerances for repeatable assembly results
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw delivers critical engineering value in applications requiring exact component positioning and rotational control. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for machinery, electronics, and automotive assemblies exposed to moisture or chemicals. The 1/8" shoulder diameter with precise fit acts as a reliable locating dowel, eliminating misalignment in rotating parts like gears, pulleys, and linkages. Its low-profile socket head and coarse UNC threads enable rapid installation while maintaining high clamp force. Engineers specify this precision shoulder screw to solve alignment challenges in jigs, fixtures, and precision instruments where dimensional stability under load is paramount.
Specification Summary & Compliance
Manufactured to exacting standards, this shoulder screw features Class 2A thread fit per UNC specifications with shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". The component fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety in industrial applications. Mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness for consistent performance.
