S-95289A112 4-40 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional holding power ensured by Class 3A thread fit for minimal backlash and secure fastening
• High mechanical strength with Rockwell B80 hardness for reliable performance under load
• Easy installation and removal with 0.050" hex drive, preventing tool slippage and damage
• Enhanced grip and alignment from the extended tip design, reducing component movement
• Broad compatibility with UNC coarse threads for quick assembly in various applications
• Regulatory compliance meeting ASME B18.3, RoHS, and REACH standards for safe global use

Professional Applications & Engineering Value

This 4-40 UNC Class 3A set screw delivers precision and durability for demanding industrial applications such as machinery assembly, electronics mounting, and precision instruments. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, extending service life in humid or chemically aggressive settings. Its headless design and hex drive allow for flush mounting in confined spaces, while the extended tip ensures positive contact with shafts or components to prevent loosening from vibrations. Engineered to ASME B18.3 specifications, it guarantees dimensional accuracy and reliable performance, making it a trusted choice for engineers seeking consistent fastening solutions in OEM and maintenance operations.

Specification Summary & Compliance

This set screw features a 4-40 UNC coarse thread with Class 3A fit for tight tolerances and precise engagement. Dimensions include a 1/4" length, 0.050" hex drive, and extended tip with diameter 0.075" and length 0.06". It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in production and use.