These Flexible Bellows hose follow ISO-KF standards. They are unsheathed and butt welded. Commonly used to build foreline vacuum plumbing and process systems. They 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.
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.
Bellows are thin-walled metal Bellows,like a spring.
Vacuum bellows are vacuum negative pressure and can only be vented.
Chuck Diameter:KF16=30 KF25=40 KF40=55 KF50=75
As customer's requirement
Widely used to build foreline vacuum plumbing and process systems.