Adapter KF-25 to Welch Vacuum Pumps (Old Style), 1380, 1402, 1403, 8806, 8811, 8816, 8821, Thread Size 1-20, Stainless Steel

These adapters are KF-25 to Welch vacuum pumps, models, 1380, 1402, 1403, 8806, 8811, 8816, & 8821, Old Style Pumps. The flange size ISO-KF NW-25 to Welch pump thread size 1-20. They are commonly used to make connections between Welch vacuum pumps and ISO-KF Flanges. The ISO-KF flanges are often called quick flange fittings because they are quick to assemble. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges (please see top right figure - click to enlarge). The centering ring contains a rubber elastomer o-ring. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively. They are made of corrosive resistant stainless steel.

Adapter KF-25 to Welch vacuum pump (Old Style), models 1380, 1402, 1403, 8806, 8811, 8816, & 8821
ISO-KF Flange Size: NW-25
Thread Size: 1-20 NPSM
Common Dimensions: A = 2.76 in., B = 0.56 in.
FOR OLD STYLE WELCH VACUUM PUMPS, ie. An Old Style Pump has an oil sight glass
held in place with a bolt ring, click on far right picture for example of an old style pump.