S-99553A156 4-40 x 3/8" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Precise and secure fastening ensured by the Class 3A thread fit, minimizing the risk of loosening under vibration.
• High-strength performance with a Rockwell B80 hardness, providing reliable clamping force and resistance to wear.
• Easy installation and removal with the 0.050" hex drive, allowing for efficient assembly and maintenance.
• Effective component positioning using the oval tip design, which helps prevent damage to shafts and components.
• Broad industry compatibility by meeting ASME B18.3 specifications, ensuring consistent quality and interchangeability.
• Environmentally responsible manufacturing with compliance to RoHS 3 and REACH regulations, supporting sustainable procurement.

Professional Applications & Engineering Value

This 4-40 UNC set screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and vibration resistance are paramount. Made from 316 Stainless Steel, it excels in demanding environments such as marine, chemical processing, and food machinery, preventing rust and maintaining integrity. The Class 3A thread fit and coarse UNC thread provide a tight, reliable grip that resists loosening, while the headless design and oval tip allow for flush mounting and secure component positioning without marring surfaces. Ideal for securing collars, pulleys, and gears, this screw ensures long-term performance and reduces maintenance needs in industrial applications.

Specification Summary & Compliance

This set screw features a 4-40 UNC coarse thread with a Class 3A thread fit for high precision, a length of 3/8", and a drive size of 0.050". It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality assurance.