S-8077A288 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Enhanced wear resistance and reduced light reflection provided by the Black Oxide finish, improving durability and usability.
• Precise component alignment and secure pivoting ensured by the 7" shoulder with tight length tolerances (±0.005").
• High mechanical strength and reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications.
• Secure, non-slip installation facilitated by the knurled socket head and 1/4" hex drive, allowing for high torque application.
• Excellent thread engagement and vibration resistance due to the Class 3A thread fit and coarse UNC thread form.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to solve critical alignment and wear challenges in precision industrial applications. Manufactured from 316 Stainless Steel, it offers exceptional resistance to corrosion from chemicals and saltwater, making it suitable for marine, chemical processing, and food machinery. The 7" shoulder length with minimal tolerance variation provides a stable bearing surface for rotating parts like gears, pulleys, and linkages, preventing misalignment and reducing bushing wear. The Black Oxide finish not only adds a layer of protection against abrasion but also minimizes galling. Combined with the Class 3A thread fit and coarse thread, this socket head shoulder screw ensures reliable, vibration-resistant fastening in high-stress assemblies, from heavy-duty automation equipment to precision instruments.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for superior thread engagement and a shoulder diameter tolerance of -0.004" to -0.002". The shoulder length is held to a tight tolerance of -0.005" to 0.005". It conforms to the ASME B18.3 standard for dimensional consistency and performance. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.