S-8077A479 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.
- Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, non-reflective appearance.
- Precise and secure assembly ensured by the Class 3A thread fit, offering tighter tolerances for high-vibration applications.
- High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, reliably handling significant loads.
- Easy installation and removal using a standard 5/64" hex drive and a knurled head for improved grip.
- Versatile coarse UNC threading (4-40) for faster assembly and reduced cross-threading risk in industrial settings.
- Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safe and sustainable use.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly jigs. The black oxide finish not only boosts corrosion resistance but also minimizes galling, a common issue in stainless fasteners. The UNC coarse thread and Class 3A fit provide exceptional dimensional stability, reducing the risk of loosening under dynamic loads. The integrated shoulder acts as a precise pivot or spacer, eliminating the need for additional components and simplifying designs. With high tensile and shear strength, it ensures reliable performance in demanding applications like robotics, aerospace components, and medical devices, where failure is not an option.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A fit for precision threading. Key dimensional tolerances include a shoulder diameter tolerance of -0.004" to -0.002" and a shoulder length tolerance of -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of hazardous substances and suitable for global industrial use.
