S-94128A141 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 Thread Precision – Class 3A fit ensures tight, reliable fastening with minimal backlash in high-vibration environments
- Superior Wear Resistance – Rockwell C32 hardness provides extended service life under repeated assembly and disassembly cycles
- Optimized Shoulder Alignment – Precise 1/8" diameter shoulder with tight tolerances maintains accurate component positioning
- Robust Material Performance – Alloy steel construction delivers high tensile strength for demanding mechanical applications
- Quick Installation – Coarse UNC threading enables faster assembly compared to fine-thread alternatives
- Versatile Drive Compatibility – Slotted headless design accommodates standard tools while maintaining low-profile installation
- Global Compliance Ready – Meets RoHS 3 and REACH environmental standards for international industrial deployments
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw solves critical alignment challenges in precision assemblies where component positioning is paramount. The alloy steel construction combined with Rockwell C32 hardness withstands shear forces in rotating mechanisms, while the precise shoulder fit eliminates bushing wear in pivot points and bearing surfaces. The Class 3A thread fit maintains clamping force in vibrating equipment, making it ideal for robotics, automation systems, and precision instrumentation. The headless design with slotted drive allows flush mounting in confined spaces, while coarse threading ensures rapid assembly in high-volume production environments without compromising mechanical integrity.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit (0.112" major diameter) and precise shoulder dimensions (1/8" diameter ±0.001", 1/8" length +0.005"). Thread specification follows UNC coarse thread standards with right-hand orientation. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance control.
