S-8077A493 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.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
- Precise thread engagement ensured by Class 3A thread fit, reducing the risk of cross-threading and improving assembly reliability.
- Enhanced grip and anti-rotation from the knurled head design, allowing for secure handling and stable fastening.
- Convenient installation and removal with the hex socket drive, providing efficient torque application in confined spaces.
- Durable surface protection via the black oxide finish, which adds an extra layer of corrosion and wear resistance.
- Compliance with global standards including RoHS 3 and REACH, ensuring environmental safety and regulatory acceptance.
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw is engineered to address common industrial challenges such as component misalignment and vibration-induced loosening. Made from 316 Stainless Steel, it excels in corrosive settings like marine, chemical processing, and outdoor equipment, where material integrity is critical. The black oxide finish enhances durability against abrasion and moisture, while the Class 3A thread fit and standard shoulder design ensure precise alignment and secure mounting in assemblies like pivots, bearings, and machinery linkages. Its hex socket drive and knurled head facilitate quick, tool-friendly installation, reducing downtime and improving workflow efficiency in automated or manual setups.
Specification Summary & Compliance
This shoulder screw adheres to UNC coarse thread standards with a Class 3A thread fit for high precision. Dimensions include a thread size of 4-40, shoulder diameter of 1/8" (with tolerance -0.004" to -0.002"), and shoulder length of 7/8" (tolerance -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.
