S-8077A827 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise Class 3A thread fit ensures secure, vibration-resistant fastening with 1/4"-20 UNC coarse threading for easy assembly.
• Enhanced durability and wear resistance from the black oxide finish and Rockwell B79 hardness, reducing maintenance needs.
• Secure, non-slip installation facilitated by the knurled socket head and 5/32" hex drive, preventing tool slippage.
• Accurate alignment and spacing provided by the precision shoulder with controlled diameter and length tolerances.
• Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The black oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor elements. Its 1/4"-20 UNC coarse thread and Class 3A fit provide reliable, vibration-resistant connections, reducing the risk of loosening in dynamic operations. The knurled socket head with a hex drive ensures secure tool engagement, minimizing installation errors and improving efficiency. Ideal for use in pivots, spacers, and rotating assemblies, this screw offers consistent performance in industries like aerospace, automotive, and manufacturing, where corrosion resistance and high tensile strength are paramount for operational reliability.

Specification Summary & Compliance

This shoulder screw features precise inch system dimensions, including a 1/4"-20 UNC coarse thread with Class 3A fit for tight tolerances. The shoulder diameter and length adhere to strict tolerances (e.g., shoulder diameter: -0.004" to -0.002"), ensuring accurate alignment. It meets ASME B18.3 specifications for consistency and safety, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe industrial practices.