S-90311A113 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 construction, ideal for harsh environments and extended service life.
- Permanent vibration resistance provided by the Nylon Patch thread locker, ensuring assemblies stay secure from -50° to 250°F.
- High-strength performance with 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Precise Class 3A thread fit for smooth assembly and consistent engagement, reducing the risk of cross-threading.
- Easy installation and removal with a standard hex socket (5/64" drive) and knurled head for improved grip during handling.
- Durable shoulder design with controlled diameter and length tolerances for accurate positioning and alignment of components.
- Compliance with global standards including RoHS 3 and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining alignment under dynamic loads and resisting loosening from vibrations. The 316 stainless steel material offers excellent resistance to chemicals and moisture, making it suitable for industrial equipment, marine applications, and medical devices. The Nylon Patch thread locker provides a permanent locking feature that eliminates the need for additional fasteners or adhesives, streamlining assembly processes. With its Class 3A thread fit and robust shoulder design, this screw ensures reliable performance in automated machinery, optical instruments, and other high-stakes environments where precision and durability are paramount.
Specification Summary & Compliance
This shoulder screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for optimal engagement. Key dimensions include a 1/8" shoulder diameter and 1/4" shoulder length, manufactured to tight tolerances for consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.
