S-91054A461 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance and durability with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Enhanced wear resistance and extended service life due to the TiCN coating, reducing maintenance frequency.
• Precise alignment and secure component positioning ensured by the exact 1/8" shoulder diameter with tight tolerance.
• High tensile strength of 70,000 psi provides reliable fastening under heavy loads and vibrations.
• Easy installation and removal with the hex socket drive, minimizing tool slippage and damage.
• Consistent thread engagement with Class 2A UNC coarse threads for quick assembly in various materials.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. Made from 18-8 stainless steel and finished with a TiCN coating, it offers exceptional resistance to wear, corrosion, and galling, making it ideal for high-stress applications in machinery, automotive, and electronics. The precise shoulder diameter and Class 2A thread fit ensure accurate component location and reduced vibration loosening, while the hex socket drive allows for efficient torque application in confined spaces. Its 70,000 psi tensile strength and Rockwell B55 hardness provide long-term reliability, minimizing downtime and maintenance costs in industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent performance. Key dimensions include a 1/8" shoulder diameter (tolerance: -0.002" to 0"), 5/32" thread length, and coarse thread spacing. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.