ISO-QF Bored Weld flanges are manufactured in 304 and 316 stainless steel.

QF flanges are sexless, infinitely rotatable, and fastened with quick clamps that compress an elastomer O-Ring held in a centering ring between two flange faces to create a high vacuum seal.

ISO-QF flanges are generally limited to applications with temperatures between 32°F and 248–256°F, and pressure from atmosphere to ~10-8 torr or mbar.