S-96655A115 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 environments and extended service life.
- Enhanced assembly grip and torque application provided by the knurled socket head, reducing tool slippage.
- Precise component alignment and pivot points ensured by the 1/4" shoulder diameter with tight tolerances.
- High mechanical strength and durability from a Rockwell B55 hardness and 70,000 psi tensile strength.
- Reliable fastening in coarse-thread applications with the 4-40 UNC thread and Class 2B fit for consistent engagement.
- Secure partial threading allows for unthreaded shoulder sections to act as bearings or spacers in assemblies.
- Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and responsible manufacturing.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and rotational needs in precision assemblies. The 1-1/2" shoulder length and 1/4" shoulder diameter provide a stable, unthreaded bearing surface, reducing wear and maintaining part positioning in machinery, pivots, and linkages. Manufactured from 18-8 stainless steel, it offers excellent resistance to corrosion and oxidation, making it suitable for demanding environments like automotive, aerospace, and industrial equipment. The knurled socket head ensures secure drive engagement, minimizing the risk of stripping during high-torque applications. Its partially threaded design allows the shoulder to act as a dowel or axle, simplifying assembly while enhancing mechanical reliability.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2B thread fit for consistent fastening. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances and suitable for regulated industries.
