S-96126A129 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Precise component alignment ensured by the 3/4" shoulder with tight ±0.002" length tolerance for reliable assembly
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B79 hardness for demanding applications
• Secure, tamper-resistant fastening with the hex socket head and 5/64" drive, allowing high torque application in confined spaces
• Consistent thread engagement through Class 2A UNC coarse threads, providing reliable installation and vibration resistance
• Enhanced durability and wear resistance from the passivated finish, extending service life in industrial settings
• Compliance with global regulations including RoHS 3 and REACH, ensuring safety and environmental responsibility

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical alignment and corrosion challenges in precision assemblies. The 3/4" shoulder length with minimal tolerance provides an exact locating surface for rotating components in machinery, eliminating misalignment and reducing wear. The UNC coarse thread and Class 2A fit ensure quick installation and reliable performance in high-vibration environments like robotics, automotive fixtures, and conveyor systems. The passivated finish on the hex socket head enhances corrosion resistance, making it suitable for food processing, chemical, and marine applications where moisture and chemicals are present. Its 70,000 psi tensile strength supports heavy loads, offering long-term reliability in demanding industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder diameter is maintained at 1/8" with a tight tolerance of -0.001" to 0", and the shoulder length is precisely controlled at 3/4" with a tolerance of 0" to 0.002". It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.