S-99553A142 4-40 x 3/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and outdoor applications
• Precise Class 3A thread fit ensures tight tolerances and reliable, vibration-resistant fastening in critical assemblies
• High durability with Rockwell B80 hardness, providing excellent wear resistance and long service life
• Secure, flush mounting thanks to the headless design and oval tip, preventing component interference and improving aesthetics
• Easy installation and removal with the 0.050" hex drive, allowing for high torque application in confined spaces
• Wide compatibility with UNC coarse threads and 4-40 size, suitable for various machinery and equipment fastening needs
• Regulatory compliance meets ASME B18.3 standards, RoHS 3, and REACH, ensuring safety and environmental responsibility

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 316 stainless steel set screws deliver exceptional performance where corrosion and chemical exposure are concerns. The headless hex drive design allows for flush installation in tight spaces, minimizing protrusion and reducing the risk of snagging or damage in moving parts. With a Class 3A thread fit and coarse UNC threads, these screws provide superior grip and resistance to loosening under vibration, making them ideal for machinery, automotive, and electronic enclosures. The oval tip ensures positive seating on shafts or components, enhancing alignment and load distribution. This combination of material strength, precision threading, and compliant design addresses common fastening challenges, offering reliability and longevity in industrial applications.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, featuring a 4-40 UNC coarse thread with Class 3A fit for high precision. Dimensions include a 3/16" length and 0.050" hex drive size, ensuring accurate installation. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and sustainable manufacturing practices.