S-91054A463 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel, offering reliable performance in harsh environments without rusting.
• Superior Wear & Friction Reduction: TiCN coating significantly extends service life by reducing wear and providing a low-friction surface.
• High Tensile Strength for Demanding Loads: With a tensile strength of 70,000 psi, it ensures secure fastening under high-stress conditions.
• Precise Alignment & Positioning: Features a precisely machined shoulder with tight diameter and length tolerances for accurate component location.
• Reliable Thread Engagement: UNC coarse threads with a Class 2A fit provide easy assembly and consistent, secure fastening.
• Secure & Efficient Installation: Hex socket drive allows for high torque application and prevents stripping in confined spaces.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safety and sustainability for global industrial use.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to solve critical alignment and durability challenges in precision assemblies. The 18-8 Stainless Steel construction provides excellent corrosion resistance, ideal for machinery exposed to moisture or chemicals. The TiCN coating enhances surface hardness, drastically reducing wear in high-cycle applications like rotating shafts and pivots in automation equipment. The precisely controlled 1/8" shoulder diameter and 1/4" shoulder length ensure components such as gears and pulleys are accurately positioned, minimizing vibration and misalignment. With its Class 2A thread fit and 70,000 psi tensile strength, it offers reliable performance in demanding settings, from aerospace to medical devices, where failure is not an option.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features precise tolerances: diameter of -0.002" to 0" and length of 0" to 0.003". Manufactured from Rockwell B55 hardened 18-8 Stainless Steel and finished with a durable TiCN coating, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for industrial components.