S-97768A146 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
- Enhanced corrosion resistance with 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments.
- Precise alignment and pivot functionality due to the 1 1/4" shoulder length with tight tolerances for reliable assembly.
- Superior thread engagement and stripping resistance provided by the Class 3A UNC coarse thread fit.
- High tensile and shear strength (70,000 psi tensile, 35,000 psi min shear) for demanding mechanical applications.
- Secure, non-slip installation enabled by the knurled socket head and 5/64" hex drive.
- Consistent performance and durability backed by Rockwell B55 hardness and standardized shoulder fit.
- Environmental and regulatory compliance with RoHS 3 and REACH, ensuring safe and sustainable use.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and wear challenges in precision assemblies. The 18-8 stainless steel construction, combined with a black oxide finish, offers excellent corrosion resistance, reducing maintenance in moisture-prone or chemically exposed settings. The 1 1/4" shoulder length with controlled tolerances ensures accurate positioning of moving parts, such as in gears, pulleys, and linkages, minimizing misalignment and extending component life. The Class 3A thread fit and coarse UNC thread provide robust fastening in industrial machinery, electronics, and automation systems, where vibration resistance and quick assembly are paramount. Its socket head with knurling enhances grip during installation, speeding up production while maintaining torque integrity.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precision. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/4" (tolerance: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory acceptance in global markets.
