S-8077A635 1/4"-20 ASME B18.3 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 Black Oxide finish, ideal for harsh industrial environments.
- High mechanical reliability offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
- Precise thread engagement with Class 3A fit and UNC coarse thread, ensuring secure fastening and reduced assembly time.
- Enhanced grip and handling from the knurled head and hex drive, allowing for easy installation with standard tools.
- Accurate shoulder dimensions with tight tolerances, providing stable alignment in machinery and assemblies.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
- Durable construction with Rockwell B79 hardness, delivering long-term performance in high-stress conditions.
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment and corrosion-induced failures. Made from 316 Stainless Steel with a Black Oxide finish, it provides exceptional resistance to chemicals and moisture, making it suitable for marine, chemical processing, and outdoor equipment. The UNC coarse thread and Class 3A fit ensure quick, reliable fastening in assemblies requiring high precision, while the knurled head and hex drive simplify maintenance. Ideal for use in pivots, rotating shafts, and precision machinery, this screw enhances operational efficiency by reducing downtime and maintenance costs in demanding applications.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNC standards with precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It meets ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it is free from hazardous substances and suitable for global industrial use.
