S-8077A275 7/8"-9 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and black oxide finish for extended service life in harsh environments
• Precise alignment capabilities thanks to the 6" shoulder with tight diameter tolerance for reliable component positioning
• Exceptional mechanical strength delivering 70,000 psi tensile strength and 35,000 psi shear strength for heavy-duty applications
• Reliable thread engagement with Class 3A thread fit and UNC coarse threads for secure fastening in demanding conditions
• Easy installation and removal featuring 5/8" hex drive socket head with knurled texture for improved grip during torque application
• Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

This 7/8"-9 UNC shoulder screw delivers critical engineering value in applications requiring precise rotational alignment and axial positioning. The 316 stainless steel construction with black oxide finish provides exceptional resistance to corrosive environments including chemical processing, marine applications, and outdoor equipment. The 6" precision shoulder serves as an accurate locating diameter for bearings, pulleys, and rotating components, eliminating the need for additional bushings or spacers. With Rockwell B79 hardness and 70,000 psi tensile strength, this heavy-duty shoulder bolt maintains dimensional stability under significant loads, making it ideal for machinery, automation systems, and industrial equipment where vibration resistance and long-term reliability are paramount. The Class 3A thread fit ensures consistent engagement in high-cycle applications, reducing assembly time and improving manufacturing efficiency.

Specification Summary & Compliance

This precision shoulder screw features 7/8"-9 UNC coarse threads with Class 3A thread fit for superior engagement accuracy. The 6" shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 standards, the component ensures consistent quality and interchangeability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety standards. The combination of precise manufacturing specifications and regulatory compliance makes this shoulder screw suitable for demanding industrial applications requiring both technical performance and environmental consciousness.