Type 392 with external thread connection | ACI Industriearmaturen GmbH

Circular Sight Glass Type 392 - PN16-PN40 with male thread connection

Short description - Circular Sight Glass Fittings with male thread connection

The ACI screw-in sightglass type 392 is a further development of our welding socket sightglass type 390. The sightglass type 392 is equipped with an external thread on the connection side and can therefore be mounted directly to a corresponding internal thread with little effort.

For the screw-in sight glass type 392 we also use the proven Maxos® borosilicate glass according to DIN 7080. If even this highly resistant and proven industrial glass does not meet your requirements, it is also possible to use sight glasses made of high-performance materials such as quartz glass or sapphire glass instead. Special sizes for particularly high pressures are also available on request.

As with all our sight glass types, only high-quality sealing material from well-known companies is used for sealing. We supply seals made of KlingerSIL C4400, Frenzelit Novaphit MST or Garlock Gylon, but also soft-sealing variants made of silicone, EPDM or NBR. We also offer high-purity PTFE for chemically demanding applications.

The different glass and gasket materials can be combined with different flange materials as required. In addition to high-quality stainless steel grades such as 1.4571 or 1.4404, we also stock common pressure-approved steel grades such as P265GH or S235JRG2, as well as high-performance alloys such as Hastelloy.

Simply talk to our specialists to find the ideal combination for your application!

Technical details


Steel or stainless steel


Sight glass with male thread connection

Nominal size:

on demand

Nominal pressure:

PN 16


With soda lime glass up to max. 150 ° C

With borosilicate glass up to max. 280 ° C

With borosilicate & mica shield up to 320 ° C


Optional versions are possible.

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Type 392 with external thread connection