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GN 7440 Stainless Steel Sight Glasses AISI 316 L, Metal-Fused


GN 7440 Stainless Steel Sight Glasses, AISI 316 L, Metal-Fused Identification no.: 2 - Seal FPM (Viton©)
Identification no.: 2 - Seal FPM (Viton©)
GN 7440 Stainless Steel Sight Glasses, AISI 316 L, Metal-Fused Identification no.: 2 - Seal FPM (Viton©) GN 7440 Stainless Steel Sight Glasses, AISI 316 L, Metal-Fused Identification no.: 3 - Seal copper

Product Family Stainless Steel

Standard parts made of rustproof stainless steel have been designed for use in the food sector, in the chemical industry, for aggressive ambient conditions or for outdoor use.

  • corrosion-resistant
  • precise fit
  • environmentally friendly
Show all Stainless Steel products

Product description


Stainless steel sight glasses GN 7440 are equipped with a sight glass that is metal-fused to the body by a thermal process. As a result the liquid glass adapts precisely to the contour of the body. During cooling, the different coefficients of linear expansion of the two joining partners generate strong mechanical initial stress between the glass and metal.

This initial stress makes the sight glasses 100% leakproof and particularly resistant to dynamic pressures and high temperatures when used with liquid and gaseous media. Moreover, the site glass offers a high level of safety, as potential damage is indicated in advance by small cracks without breakage of the glass. The seal is embedded in a radial recess, and thus cannot be lost or squeezed out during tightening.

The recommended operating pressures are non-binding values and rule out any liability. The user must determine from case to case whether a product is suitable for the intended use. Environmental factors can influence the specified values.


Stainless steel AISI 316 L

Contrast screen
Grooves melted into sight glass

Sight glass float-glass
  • Metal-fused
  • Shrink-fit

  • Rubber FPM (Viton©) (identification no. 2)
    Temperature resistant up to 180 °C
    (without pressure load)
  • Copper (identification no. 3)
    Temperature resistant up to 300 °C
    (without pressure load)


On request

Seals of NBR or EPDM

Technical drawing

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GN 7440 Stainless Steel Sight Glasses, AISI 316 L, Metal-Fused sketch

Article options / Table


AWith reflector grooves

Identification no.

2Seal FPM (Viton©)
3Seal copper
Show / Hide columns
d3l1l2smax. operating pressure
(safety factor 5)
at -20 °C to 120 °C
in bar
11G 3/8M 16 x 1,52287,52080
14G 1/2M 20 x 1,5268,57,52380
18G 3/4M 26 x 1,532983080
24G 1M 33 x 1,540118,53680
32G 1 1/4M 42 x 1,5501294640

Build & Price

Open 3D configurator
Window glass d1
Inch thread d2
Fine thread d2

Identification no.

Selected Part (How to order)

Total (net)
plus VAT 3,31 €
gross 20,72 €
In stock
Weight: 0,022 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 50,00 €
All prices in accordance with our price list No. 53, valid from 1 May 2021, plus VAT only valid for Germany.

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Our Service-Team is available from Monday to Friday from 7:00 until 17:30: +49 7723 6507 - 100

To the customised elements | To the contact persons

GN 7440-14-M20X1,5-A-2GN 7440-32-M42X1,5-A-3GN 7440-14-G1/2-A-3GN 7440-24-G1-A-2GN 7440-32-G11/4-A-3GN 7440-32-G11/4-A-2GN 7440-32-M42X1,5-A-2GN 7440-11-G3/8-A-2GN 7440-11-M16X1,5-A-2GN 7440-24-G1-A-3GN 7440-11-G3/8-A-3GN 7440-14-G1/2-A-2GN 7440-18-G3/4-A-3GN 7440-24-M33X1,5-A-2GN 7440-18-M26X1,5-A-3GN 7440-14-M20X1,5-A-3GN 7440-24-M33X1,5-A-3GN 7440-18-M26X1,5-A-2GN 7440-11-M16X1,5-A-3GN 7440-18-G3/4-A-2

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