Features:These Conical KF-16 to KF-40 reducer vacuum fittings follow ISO-KF standards and have a flange size of NW-16 to NW-40. KF Reducer Nipples-Bakeable to 150℃, UHV cleaned, ideal for high vacuum applications (10-8 Torr).They are commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. 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.KF-16 to KF-40 Conical ReducerISO-KF Flange Size: NW-16 to NW-40Common Dimensions: A =0.62" (16mm), B =1.57" (40mm)Package Included:Stainless Steel Reducer Conical*1Note:We provide kinds of high quality 304 material vacuum equipment, if you need not found it in the store, please contact the seller.