S-8077A865 1/4"-28 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 construction, ideal for harsh industrial environments and extended service life.
- Enhanced precision and load-bearing capability from the Class 3A thread fit and fine UNF thread, ensuring reliable, vibration-resistant assemblies.
- High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding applications requiring robust fastening.
- Secure, non-slip installation facilitated by the knurled socket head and 5/32" hex drive, allowing for high torque application without tool slippage.
- Durable, wear-resistant surface thanks to the black oxide finish, which adds an extra layer of protection against abrasion and mild corrosion.
- Accurate alignment and spacing provided by the precision-machined shoulder with tight diameter and length tolerances.
- Compliance with major industry standards including ASME B18.3, RoHS, and REACH, ensuring product reliability and environmental safety.
Professional Applications & Engineering Value
This 1/4"-28 UNF thread shoulder screw is engineered to address critical alignment and high-stress challenges in precision machinery. The 316 stainless steel material provides exceptional resistance to chemicals and moisture, making it suitable for marine, chemical processing, and food industry applications where corrosion is a concern. The fine UNF thread and Class 3A fit ensure minimal backlash and secure fastening in dynamic assemblies, reducing maintenance needs. The black oxide finish not only enhances corrosion protection but also reduces galling during installation. With its knurled socket head and precise shoulder diameter, this screw offers reliable positioning in rotating components, bearings, and linkages, delivering long-term performance in demanding industrial shoulder screw applications.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with precise UNF fine thread (1/4"-28) and shoulder diameter tolerance of -0.004" to -0.002". It is manufactured in accordance with ASME B18.3 specifications and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it meets rigorous industry and safety standards for global use.
