S-90843A110 4-40 x 1/2" Cleaned and Bagged 18-8 Stainless Steel Socket Head Screws for High Vacuum

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with silver-plated 18-8 stainless steel construction, ideal for harsh environments and preventing galvanic corrosion
• High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibration, reducing failure risks
• Class 3A thread fit provides precise, tight tolerances for secure assembly and minimized loosening in critical applications
• High vacuum rating makes these screws suitable for vacuum systems, semiconductor equipment, and aerospace where outgassing is a concern
• Rockwell B70 hardness offers excellent durability and wear resistance, extending service life in repetitive use
• Hex socket drive (3/32") allows for easy installation with standard tools, improving assembly efficiency and reducing strip-out
• RoHS 3 and REACH compliance ensures environmental safety and meets international regulatory standards for industrial use

Professional Applications & Engineering Value

These silver-plated 18-8 stainless steel socket head cap screws are engineered to address common industrial challenges, such as corrosion in humid or chemical-exposed settings and the need for reliable performance in high vacuum environments. The 4-40 UNC coarse threads and Class 3A fit provide superior grip and alignment, reducing the risk of cross-threading in automated assembly lines. With a tensile strength of 70,000 psi and Rockwell B70 hardness, they withstand high stress and repetitive use in applications like precision instruments, medical devices, and vacuum-rated systems. The silver plating enhances conductivity and anti-galling properties, making these fully threaded screws a top choice for industries requiring consistent, long-lasting fastening solutions without compliance concerns.

Specification Summary & Compliance

This product features precise 4-40 UNC coarse threads with a Class 3A thread fit for high accuracy, a 1/2" length, and a right-hand thread direction. It is manufactured from 18-8 stainless steel with a silver-plated finish and meets key standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial applications.