Perkin Elmer CF Vacuum Flange 2.75" OD 1.5" ID Stainless Steel High Vacuum

Perkin Elmer CF Vacuum Flange 2.75" OD 1.5" ID Stainless Steel High Vacuum

This is a stainless steel ConFlat (CF) vacuum flange from Perkin Elmer, measuring 2.75 inches outer diameter with a 1.5-inch inner diameter and a 1.9-inch inner OD. CF flanges use a knife-edge sealing design that bites into a soft metal gasket (typically copper or aluminum) to form an all-metal, leak-tight seal — making them the standard fitting for high-vacuum and ultra-high-vacuum (UHV) systems. The flange features six evenly spaced bolt holes for secure mating to a corresponding CF-flanged port.

Specifications & What's Included

• Brand: Perkin Elmer
• Flange standard: ConFlat (CF)
• Outer diameter (OD): 2.75 in
• Inner diameter (ID): 1.5 in
• Inner OD: 1.9 in
• Material: Stainless steel
• Bolt holes: 6, evenly spaced
• Knife-edge sealing groove machined into both faces
• Flange only — no gasket or hardware included

Applications

ConFlat (CF) flanges are the industry standard connection for high-vacuum and ultra-high-vacuum chambers, routinely used in semiconductor processing equipment, surface science instruments, electron microscopes, mass spectrometers, thin-film deposition systems, and particle physics research apparatus. Perkin Elmer was a major supplier of vacuum and analytical instrumentation, and their CF fittings conform to the same bolt-circle and knife-edge geometry as the broader CF standard, making them compatible with matched CF flanges from other manufacturers at the same nominal tube OD. The 2.75-inch OD size (sometimes referenced as CF 1.33 or CF 1.5 depending on convention and era) is commonly found on small-bore ports for gauges, valves, viewports, and feedthroughs. These flanges remain in active use today wherever a bakeable, all-metal seal is required in vacuum systems, and are routinely sourced as replacement or spare hardware for existing chamber configurations.