S-91054A464 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability and Corrosion Resistance: Made from 18-8 Stainless Steel with a TiCN coating, this shoulder screw offers superior wear and corrosion resistance, extending service life in harsh industrial environments.
• High Tensile Strength for Demanding Applications: With a tensile strength of 70,000 psi and Rockwell B55 hardness, it reliably handles high-stress loads without failure.
• Precise Shoulder Fit for Accurate Alignment: Features a precise shoulder diameter of 1/8" and length of 3/8" with tight tolerances, ensuring exact component positioning and reducing assembly errors.
• Secure and Easy Installation: The socket head with a 5/64" hex drive allows for high-torque installation and removal, minimizing stripping and improving operational efficiency.
• Reliable Thread Performance: UNC coarse threads with a Class 2A fit provide consistent engagement and vibration resistance, ideal for dynamic applications.
• Compliance with Environmental and Safety Standards: RoHS 3 and REACH compliant, ensuring safe use in regulated industries and global markets.
• Versatile Right-Hand Thread Design: The standard right-hand thread direction facilitates easy integration with common components, streamlining assembly processes.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as misalignment and wear in high-motion equipment. Constructed from 18-8 Stainless Steel and enhanced with a TiCN coating, it delivers exceptional resistance to abrasion and corrosion, making it ideal for applications in robotics, aerospace, and automotive systems where reliability is paramount. The precise shoulder dimensions (1/8" diameter and 3/8" length) ensure accurate pivoting and spacing, reducing downtime from component slippage. Combined with a Class 2A thread fit and 70,000 psi tensile strength, it provides a robust fastening solution that maintains integrity under vibration and load, supporting efficient maintenance and long-term performance in industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. Key specifications include a shoulder diameter of 1/8" (tolerance: -0.002" to 0") and shoulder length of 3/8" (tolerance: 0" to 0.003"), ensuring precise assembly. It is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious and safety-focused industries.