S-90843A200 1/4"-20 x 3/4" 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 in mixed-material assemblies
• Superior vacuum integrity with high vacuum rating, ensuring reliable performance in vacuum chambers, scientific instruments, and cleanroom applications
• Precise thread engagement with Class 3A thread fit for tighter tolerances and reduced risk of cross-threading in critical assemblies
• High mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for demanding load-bearing applications
• Secure hex drive installation with 3/16" hex drive providing positive torque transmission and reduced cam-out risk
• Full regulatory compliance with RoHS 3 and REACH standards, ensuring environmental safety and global market acceptance
• Optimized for industrial use with coarse UNC threads for faster assembly and reduced susceptibility to clogging in challenging conditions

Professional Applications & Engineering Value

Engineered for high-vacuum environments and precision assemblies, these silver-plated 18-8 stainless steel socket head cap screws deliver exceptional performance where outgassing and contamination control are critical. The Class 3A thread fit ensures precise mating with tapped holes, eliminating play in sensitive instrumentation and optical mounting systems. The combination of 70,000 psi tensile strength and corrosion-resistant properties makes these fasteners ideal for semiconductor equipment, aerospace components, and medical devices where reliability cannot be compromised. The silver plating provides superior electrical conductivity while maintaining vacuum integrity, solving common challenges in UHV systems and electronic enclosures requiring both mechanical stability and EMI shielding.

Specification Summary & Compliance

This 1/4"-20 UNC socket head cap screw features precision Class 3A thread fit with coarse thread spacing and right-hand thread direction. Manufactured from 18-8 stainless steel with silver plating, it meets dimensional requirements for industrial fasteners with 3/4" length, 3/8" head diameter, and standard socket head profile. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to international environmental and safety standards for industrial components.