S-90325A151 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 industrial environments
- High-strength durability offering 70,000 psi tensile strength and Rockwell B55 hardness to withstand heavy-duty mechanical stresses
- Precise alignment and spacing enabled by the 1/8" shoulder diameter with tight tolerances for accurate component positioning
- Secure and efficient installation through the hex socket drive design, preventing cam-out and ensuring consistent torque application
- Reliable thread engagement with Class 2A UNC coarse threads providing excellent fit and vibration resistance in assemblies
- Environmental compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries
- Optimized for right-hand applications with standard thread direction for compatibility with common assembly processes
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw delivers exceptional engineering value in precision assemblies where alignment and durability are critical. The 18-8 Stainless Steel construction with passivated finish provides superior corrosion resistance, making it ideal for machinery, automotive, and electronic applications exposed to moisture or chemicals. The precisely machined 1/8" shoulder diameter acts as a reliable pivot or spacer, eliminating the need for additional components and reducing assembly time. With its hex socket drive and Class 2A thread fit, installation is secure and consistent, preventing damage to sensitive components. These shoulder screws are engineered to maintain dimensional stability under load, solving common challenges of misalignment and wear in rotating mechanisms and precision instruments.
Specification Summary & Compliance
This precision shoulder screw features Class 2A thread fit with UNC coarse threads (4-40 size) and maintains tight shoulder diameter tolerance of -0.001" to 0". Manufactured to industry standards with 70,000 psi tensile strength and Rockwell B55 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.
