S-92949A427 8-40 x 1/4" Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
• Superior holding power from the fully threaded design and 70,000 psi tensile strength for reliable, long-term fastening.
• Precise, secure fit ensured by the Class 3A thread fit and 8-40 extra fine thread, minimizing the risk of loosening under vibration.
• High durability with a Rockwell B55 hardness, providing excellent resistance to wear and deformation.
• Easy installation and removal using a standard 3/32" hex drive, compatible with common tools for efficient assembly.
• Sleek, low-profile rounded button head offers a finished appearance and reduces snagging in compact spaces.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and sustainability in global supply chains.

Professional Applications & Engineering Value

This 8-40 extra fine thread rounded button head screw is engineered to address critical challenges in precision assembly and demanding conditions. The 18-8 stainless steel material provides excellent corrosion resistance, making it suitable for applications in electronics, aerospace, and medical devices where exposure to moisture or chemicals is a concern. The Class 3A thread fit and extra fine UNF thread deliver tight tolerances, reducing the risk of thread stripping and ensuring a secure fit in thin materials or fine-pitch components. With a fully threaded design and 70,000 psi tensile strength, it offers consistent clamping force and vibration resistance, ideal for securing sensitive instrumentation or machinery parts that require reliability and minimal maintenance. The low-profile rounded head and hex drive facilitate easy access in confined spaces, streamlining installation while maintaining a professional finish.

Specification Summary & Compliance

This screw features a Class 3A thread fit for high precision, with 8-40 extra fine UNF threads and a thread diameter of 0.164". It is manufactured from 18-8 stainless steel with a tensile strength of 70,000 psi and Rockwell B55 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for industrial use.