S-90843A210 4-40 x 1" Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum

Key Features & Benefits at a Glance

• Superior corrosion resistance and electrical conductivity with silver-plated 18-8 stainless steel construction, ideal for harsh environments and specialized electrical applications.
• Exceptional mechanical strength and durability with a 70,000 psi tensile strength and Rockwell B70 hardness, ensuring reliable performance under high stress.
• Precise and secure fastening thanks to the Class 3A thread fit and 4-40 UNC coarse threads, providing excellent vibration resistance and reduced loosening.
• Optimized for high-vacuum environments with a high vacuum rating, preventing outgassing and maintaining system integrity in sensitive applications.
• Easy installation and high torque capability with a standard hex socket head and 3/32" drive, allowing for efficient assembly with common tools.
• Full thread engagement for maximum grip as the screw is fully threaded, ensuring even load distribution along the entire length.
• Compliance with major environmental regulations including RoHS 3 and REACH, making them safe for use in regulated industries worldwide.

Professional Applications & Engineering Value

This silver-plated 18-8 stainless steel socket head cap screw is engineered to address critical challenges in precision industries. The silver plating not only enhances corrosion resistance but also provides excellent electrical conductivity, making it ideal for high-vacuum systems, aerospace components, and electronic enclosures where preventing contamination and ensuring reliable electrical contact are paramount. The Class 3A thread fit and 4-40 UNC coarse threads deliver superior clamping force and vibration resistance, reducing maintenance needs in dynamic environments. With a tensile strength of 70,000 psi and Rockwell B70 hardness, it withstands high mechanical loads without failure, ensuring long-term reliability in demanding industrial fastening applications. Its compliance with RoHS 3 and REACH further supports its use in globally regulated markets, providing peace of mind for engineering and procurement teams.

Specification Summary & Compliance

This screw adheres to inch system measurements with a 4-40 UNC coarse thread and Class 3A precision fit, ensuring tight tolerances for reliable assembly. It is manufactured from 18-8 stainless steel with a silver-plated finish and features a standard socket head with a 3/32" hex drive. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial applications.