S-96640A338 4-40 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments
• High tensile strength of 80,000 psi ensures reliable, long-lasting fastening under demanding loads
• Rockwell B80 hardness provides excellent durability and resistance to wear and deformation
• Standard 100° countersink angle allows for a flush, secure fit in countersunk applications
• Coarse UNC threads with Class 2A fit enable quick, easy installation and superior grip
• Fully threaded design maximizes holding power along the entire screw length
• Phillips drive (No. 1) offers common tool compatibility and efficient driving

Professional Applications & Engineering Value

These 4-40 UNC flat head screws are engineered to address critical industrial fastening challenges, particularly where corrosion resistance and high tensile strength are paramount. The Black-Oxide 18-8 Stainless Steel construction prevents rust and degradation in moist or chemically aggressive settings, while the fully threaded coarse UNC design ensures rapid assembly and robust clamping force. The standard 100° countersink angle and flat head profile provide a smooth, flush finish, reducing snagging risks in machinery, electronics, and structural assemblies. Ideal for OEM manufacturing, automotive, and marine applications, these screws deliver consistent performance and reduce maintenance needs, enhancing operational reliability.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to ASME B18.6.3 manufacturing standards, ensuring dimensional accuracy and interchangeability. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. The right-hand coarse UNC 4-40 threading and 1/2" length provide reliable fastening in various industrial setups.