S-8077A271 7/8"-9 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments
• Enhanced durability and wear resistance from the black oxide finish, reducing maintenance needs
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Precise thread engagement with Class 3A fit and UNC coarse threads, ensuring reliable fastening and vibration resistance
• Easy installation and removal thanks to the 5/8" hex drive and knurled head for improved grip
• Accurate alignment and spacing with a precisely machined shoulder diameter and length tolerances
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety

Professional Applications & Engineering Value

This high-performance shoulder screw is engineered to address critical challenges in industrial machinery, automation systems, and heavy equipment. The 316 stainless steel material provides exceptional resistance to corrosion and chemical exposure, making it suitable for demanding environments like marine, chemical processing, and outdoor applications. The black oxide finish not only enhances aesthetics but also adds a protective layer against wear and galling, extending service life. With a Class 3A thread fit and UNC coarse threads, it ensures secure fastening in high-vibration settings, reducing the risk of loosening. The knurled head and 5/8" hex drive facilitate easy manual or tool-assisted installation, saving time in assembly and maintenance. Ideal for precision alignment in pivots, shafts, and rotating components, this shoulder screw delivers reliable performance where dimensional accuracy and strength are paramount.

Specification Summary & Compliance

This shoulder screw features a 7/8"-9 UNC thread with Class 3A fit for precise tolerance and reliable engagement. Key dimensions include a shoulder diameter of 1 1/4" with tolerance of -0.004" to -0.002", and shoulder length of 2" with tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications for dimensional standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are adhered to for industrial use.