S-99154A340 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Precise alignment and reduced wear due to the 1/8" shoulder diameter with tight tolerances for stable component positioning.
• High strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Reliable fastening performance from the UNC coarse thread and Class 2A fit, ensuring easy assembly and vibration resistance.
• Low-profile socket head design allows for compact installations and secure drive engagement in confined spaces.
• Compliance with environmental standards including RoHS 3 and REACH, supporting sustainable and safe manufacturing practices.
• Right-hand thread direction for standard installation, enhancing usability across various machinery and equipment setups.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as minimizing misalignment and wear in rotating parts. The 18-8 stainless steel material offers excellent resistance to corrosion and oxidation, making it suitable for applications in electronics, automotive, and industrial machinery where exposure to moisture or chemicals is common. The low-profile socket head and precise shoulder fit ensure secure mounting of components like gears and pulleys, reducing the need for additional bushings and simplifying maintenance. With its Class 2A thread fit and coarse threading, it provides reliable fastening in high-vibration environments, enhancing the longevity and performance of your equipment while meeting stringent industry standards.

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" with tolerances from -0.001" to 0", and a shoulder length of 3/8" with tolerances of 0" to 0.002" for precise assembly. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence in industrial use.