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Metric Sight Glass
Metric sight glasses with male fittings conforming to ISO 6149-1 standard, (SAE 2244-1/DIN 3852, Part 3). The housings have metric straight threads to ISO 262. In other words, metric sight glasses are governed by ISO 6149-1 for the port details, and the threads are governed by Metric ISO 261 standard. The windows in these metric sight glasses are fused, bonded or sealed with a gasket within their metal housings. The part is easy to install, and has a long working life without maintenance. These sight windows are typically used for visual inspection, machine vision, optical sensors in use with all common hydraulic oils, refrigeration, water heaters and compressed air applications.
Metaglas, Herberts Industrieglas GmbH & Co. KG
Metric Threaded Sight Glass, Borosilicate Fused to Metal Housing

Sight window with straight metric threads sealing with an O-ring. Female connection port conforming to DIN 3852 Type F. For visual inspection, machine vision, optical sensors, in use with all common hydraulic oils, refrigeration, water heaters, and compressed air applications. Fusing glass to metal creates a hermetically sealed single-piece part. The advantage of this construction is high strength of the glass, which ensures safety of operation, even during cycling operating temperatures common with equipment starts and stops. The part is easy to install, and has a long working life without maintenance.
Thread | Aperture Dia. | Housing Material | Max Operating Temp. | Max Operating Pressure | Window Material | Mfg P/N | Encole P/N | Price | |
---|---|---|---|---|---|---|---|---|---|
M18 x 1.5 | 12.5 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M18x1.5H | 781E1801 | $ 398.80 each | |
M20 x 1.5 | 13 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M20x1.5H | 781E1802 | $ 459.75 each | |
M26 x 1.5 | 16 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M26x1.5H | 781E1803 | $ 515.80 each | |
M27 x 2 | 16 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M27x2H | 781E1804 | $ 538.98 each | |
M33 x 2 | 22 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M33x2H | 781E1805 | $ 575.90 each | |
M42 x 2 | 26 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M42x2H | 781E1806 | $ 649.47 each | |
M48 x 2 | 28 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M48x2H | 781E1807 | $ 698.54 each | |
M60 x 2 | 35 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M60x2H | 781E1808 | $ 754.41 each | |
M78 x 2 | 50 mm | Hastelloy C-22 | 300 C | 50 bar | Borosilicate | Met-61-M78x2H | 781E1809 | $ 795.84 each | |
M18 x 1.5 | 12.5 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M18x1.5S | 781E18010 | $ 195.04 each | |
M20 x 1.5 | 13 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M20x1.5S | 781E18011 | $ 223.70 each | |
M26 x 1.5 | 16 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M26x1.5S | 781E18012 | $ 275.80 each | |
M27 x 2 | 16 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M27x2S | 781E18013 | $ 314.65 each | |
M33 x 2 | 22 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M33x2S | 781E18014 | $ 356.40 each | |
M42 x 2 | 26 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M42x2S | 781E18015 | $ 394.70 each | |
M48 x 2 | 28 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M48x2S | 781E18016 | $ 418.25 each | |
M60 x 2 | 35 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M60x2S | 781E18017 | $ 456.75 each | |
M78 x 2 | 50 mm | Duplex 2205 | 280 C | 50 bar | Borosilicate | Met-61-M78x2S | 781E18018 | $ 498.20 each |