S-92949A337 6-40 x 1/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments.
• Exceptional thread engagement and vibration resistance due to the Class 3A precision fit and UNF fine thread profile.
• High mechanical strength and durability backed by a 70,000 psi tensile strength and Rockwell B55 hardness.
• Secure and efficient installation with the internal hex drive (5/64") and low-profile rounded button head design.
• Full-length threading ensures maximum grip and holding power across the entire 1/4" length.
• Guaranteed reliability and interchangeability through compliance with the ASME B18.3 standard.
• Safe for regulated industries as they are RoHS 3 and REACH compliant, containing no hazardous substances.

Professional Applications & Engineering Value

These 6-40 UNF rounded head screws are precision-engineered to solve critical fastening challenges in demanding industrial settings. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making them ideal for applications in electronics, medical devices, and marine equipment where corrosion is a primary concern. The Class 3A thread fit and fine thread design ensure a tight, secure connection that minimizes the risk of loosening under vibration, a common failure point in machinery and assemblies. The hex drive and button head profile allow for efficient installation in confined spaces while maintaining a sleek, low-profile appearance. This combination of material integrity, precision threading, and thoughtful design delivers reliable performance that extends equipment lifespan and reduces maintenance needs.

Specification Summary & Compliance

This product features a Class 3A thread fit for high precision, manufactured to the ASME B18.3 standard for dimensional consistency and reliability. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. Key dimensional specifications include a 6-40 UNF fine thread, a 1/4" length that is fully threaded, a head diameter of 0.262", and a drive size of 5/64" hex.