Atlas Socket, Butt and Male weld ATCR™ face-seal fittings are fitted with a durable stainless steel sealing face that is explosion welded (EXW) to an aluminum body. The bond produced is extremely rugged. All face-seal fittings are helium leak tested for service in UHV environments in excess of 1x10-9Torr. Atlas ATCR™ fittings enable robust demountable use of aluminum tubing in cryogenic, physics and semiconductor applications worldwide. Standard socket, butt, male and chamber mount weld fitting geometries are available in 1/4, 3/8, 1/2, 3/4 and 1 inch tube diameters. Chamber mount fittings are available in four length configurations suitable for 1/2, 3/4, 1 and 1-1/4 inch chamber wall thicknesses.Atlas ATCR™ fittings are fully compatible with Swagelok VCR® and Parker-Hannifin VacuSeal® fittings, but unlike these other fittings Atlas ATCR™ fittings are used where high thermal conductivity, light weight, high chemical resistance or where any of the advantageous physical properties of aluminum are required.