S-96126A127 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 316 Stainless Steel and passivated finish, ideal for harsh industrial environments.
- Precise component alignment ensured by the smooth, accurate 1/8" shoulder diameter with tight tolerances.
- High-strength performance offering 70,000 psi tensile strength and Rockwell B79 hardness for reliable, durable assemblies.
- Secure and efficient installation with a standard hex socket head and 5/64" drive, preventing stripping and enabling high torque application.
- Consistent thread engagement thanks to UNC coarse threads and Class 2A fit, reducing cross-threading risks.
- Extended shoulder length of 1/2" provides stable bearing surface and precise spacing in assemblies.
- Compliance with global regulations including RoHS 3 and REACH, ensuring safety and environmental standards are met.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 316 Stainless Steel construction, combined with a passivated finish, offers exceptional resistance to corrosion and chemicals, making it suitable for medical devices, aerospace components, and marine equipment. The precise shoulder with minimal diameter and length tolerances ensures accurate positioning of moving parts, reducing wear and maintaining operational integrity. Its socket head design with a hex drive allows for compact installation in confined spaces, while the coarse UNC threads provide quick assembly and high vibration resistance. This screw delivers reliable performance in applications demanding tight fits and long-term reliability under stress.
Specification Summary & Compliance
The screw features a Class 2A thread fit for consistent engagement and a shoulder diameter tolerance of -0.001" to 0" with length tolerance of 0" to 0.002" for precise assembly. It adheres to UNC thread standards and is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for industrial and export applications.
