S-90841A150 1/4"-20 x 1/2" ASME B18.3 High-Vacuum Cleaned-and-Bagged Vented Socket Head Screws

Key Features & Benefits at a Glance

• Superior vacuum sealing performance with vented design and high vacuum rating for reliable operation in critical environments
• Exceptional corrosion resistance from 18-8 stainless steel construction, ensuring long-term durability in harsh conditions
• Precise thread engagement with Class 3A thread fit for secure fastening and vibration resistance in demanding applications
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty industrial use
• Standard hex drive compatibility with 3/16" drive size for easy installation using common tools
• Full regulatory compliance meeting ASME B18.3 specifications, RoHS 3, and REACH standards for global acceptance
• Optimized for coarse threading with UNC 1/4"-20 threads providing quick assembly and disassembly in industrial settings

Professional Applications & Engineering Value

This high-vacuum socket head cap screw delivers critical performance in demanding environments where standard fasteners fail. The 18-8 stainless steel construction provides excellent corrosion resistance while maintaining 70,000 psi tensile strength for structural integrity under load. The specialized vented design with 0.063" vent diameter enables proper outgassing in vacuum systems, preventing pressure buildup that compromises seal integrity. With Class 3A thread fit and UNC coarse threading, these screws ensure precise engagement in equipment requiring frequent maintenance or adjustment. Ideal for semiconductor manufacturing, analytical instrumentation, aerospace components, and medical devices where vacuum integrity and material reliability are paramount.

Specification Summary & Compliance

This socket head cap screw features precision Class 3A thread fit with 1/4"-20 UNC coarse threads and right-hand threading direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and global market acceptance. All dimensions including the 3/8" head diameter, 1/4" head height, and 1/2" length maintain strict tolerance control for consistent performance in industrial applications.