S-8077A879 3/4"-10 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 in high-stress applications.
• Precise alignment and smooth rotation ensured by the standard shoulder fit and a generous 1-3/4" shoulder length.
• Secure, non-slip installation facilitated by the knurled head and a robust 1/2" hex drive for high-torque applications.
• Accurate and durable thread engagement with a Class 3A UNC coarse thread fit, reducing the risk of cross-threading.
• Enhanced wear resistance and reduced light reflection from the black oxide finish, while maintaining compliance with RoHS 3 and REACH regulations.
• Guaranteed dimensional consistency and interchangeability, manufactured to meet the stringent ASME B18.3 standard.

Professional Applications & Engineering Value

This 3/4"-10 UNC shoulder screw is engineered to address critical challenges in precision machinery and heavy-duty industrial assemblies. The 316 stainless steel material provides excellent resistance to corrosion and chemicals, making it suitable for demanding environments like chemical processing or marine applications. The Class 3A thread fit and precisely machined shoulder work in tandem to act as a pivot, bearing surface, or locator, eliminating the need for separate spacers or bushings. This simplifies assembly, reduces parts count, and minimizes wear on mating components. The black oxide finish not only adds a layer of protection against galling and wear but also aids in corrosion resistance. Combined with the high tensile strength and knurled head for a secure grip, this screw delivers reliable performance in applications such as conveyor systems, robotic arms, and fixture plates, ensuring long-term operational integrity.

Specification Summary & Compliance

This shoulder screw features a 3/4"-10 UNC thread with a Class 3A fit for precise engagement. The shoulder diameter is 7/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1-3/4" with a tolerance of -0.005" to +0.005". It is manufactured in compliance with the ASME B18.3 standard and is confirmed to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations.