S-99154A403 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 industrial environments.
- Precise alignment and reduced wear due to the exact 1/8" shoulder diameter with tight tolerances for stable component positioning.
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting fastening under stress.
- Easy installation and space-saving design with a low-profile socket head and slotted drive for efficient assembly in confined areas.
- Consistent thread engagement with Class 2A UNC coarse threads ensuring secure fits and reduced cross-threading risks.
- Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated applications.
- Versatile right-hand threading for standard assembly processes, enhancing compatibility across various machinery and equipment.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as minimizing misalignment and vibration-induced failures. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for demanding sectors like automotive, electronics, and machinery where durability is paramount. Its low-profile socket head and slotted drive style facilitate quick installation in tight spaces, while the precise shoulder diameter ensures accurate part location, reducing wear and maintenance costs. By incorporating coarse UNC threads and a Class 2A thread fit, it delivers reliable performance in high-stress applications, offering engineers a robust fastening solution that enhances operational efficiency and product lifespan.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety. Key specifications include a shoulder diameter of 1/8" with tolerances from -0.001" to 0", and a shoulder length of 5/32" with tolerances of 0" to 0.002", supporting precise engineering requirements.
