S-8077A257 1 1/8"-7 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
• High-strength reliability with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring secure fastening under heavy loads
• Precision alignment and smooth rotation due to the 1 1/2" shoulder with tight diameter tolerance, minimizing component wear
• Secure, non-slip installation with the knurled socket head and 7/8" hex drive, allowing for high-torque application without stripping
• Accurate and consistent threading with Class 3A UNC coarse thread, enabling quick assembly and reliable engagement
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The black oxide finish not only enhances corrosion resistance but also reduces galling and friction during assembly, extending service life in high-stress applications. The 1 1/2" shoulder length provides a precise pivot point or spacer, maintaining alignment in rotating assemblies like conveyor systems, robotic arms, and bearing mounts. With a Rockwell B79 hardness and UNC coarse thread, it ensures robust performance in vibrating environments, preventing loosening and reducing downtime. Ideal for OEM and MRO uses, this screw delivers consistent reliability where high tensile strength and chemical resistance are paramount.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring exact fit in precision applications. It adheres to Class 3A thread fit per UNC standards and is manufactured in compliance with ASME B18.3 specifications. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for industrial use.