S-8077A279 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 environments and chemical exposure
• Enhanced durability and wear resistance from the Black Oxide finish, providing long-lasting performance and reduced maintenance needs
• Precise alignment and secure positioning thanks to the 1 1/4" shoulder diameter with tight tolerances, minimizing component movement
• High-strength fastening capability with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications
• Easy installation and removal with the 5/8" hex drive and knurled head, offering superior grip and torque application without slippage
• Accurate thread engagement through Class 3A thread fit and UNC coarse threading, delivering consistent, vibration-resistant connections
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility

Professional Applications & Engineering Value

This 7/8"-9 UNC shoulder screw is engineered to address critical challenges in industrial machinery, automation systems, and precision equipment assembly. The 316 Stainless Steel material provides exceptional resistance to corrosion and high temperatures, making it suitable for marine, chemical processing, and food-grade applications. The Black Oxide finish not only enhances surface hardness but also reduces galling and friction during installation. With its knurled socket head and 5/8" hex drive, it ensures secure tool engagement, preventing stripping and enabling high-torque applications. The 1 1/4" shoulder diameter and precise tolerances allow for exact component alignment, reducing wear and improving operational stability in rotating assemblies, pivots, and bearing mounts.

Specification Summary & Compliance

This shoulder screw features Class 3A thread fit with UNC coarse threads (7/8"-9) for reliable fastening. The shoulder diameter is 1 1/4" with a tolerance of -0.004" to -0.002", and shoulder length is 1 1/4" with a tolerance of -0.005" to 0.005", ensuring precise dimensional accuracy. It meets ASME B18.3 specifications for dimensional and mechanical requirements. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for hazardous substances.