Type 3505…
With fixed sight star, white painted* or unpainted (colourless), made of brass. Operating pressure 4 bar, temperature resistant up to 120 °C, with natural glass to DIN 3169.
Group A · Brass
Brass oil sight glass – round, screwed in from the front
Brass oil sight glass, round, screwed from the front, optionally with fixed reflector (viewing star) or without reflector or with float glass or borofloat glass.
Versions
The article number is made up of the type (see below) and the thread size (see tables).
Type 3515…
As type 3505…, but without sight star.
Type 3605…
With fixed sight star, white painted* or unpainted (colourless), made of brass. Operating pressure 3 bar (oil-tight), temperature resistant up to 300 °C, with Borofloat 33 glass (formerly Tempax).
Type 3615…
As type 3605…, but without sight star.
Forming the article number
Type + thread size (2nd part of the article number from the table).
| Example 1 | 3505… + …1615 = 35051615 | Brass, M 16x1.5, float glass up to 120 °C, with fixed sight star painted white* |
|---|---|---|
| Example 2 | 3615… + …0100 = 36150100 | Brass, G 1”, Tempax up to 300 °C, without sight star |
Threads and dimensions
| Thread | Article no. (2nd part) | Outer Ø (D) | Sight window Ø (d) | Length (L) | Collar height (h) |
|---|---|---|---|---|---|
| Pipe thread BSP DIN ISO 228 | |||||
| G 3/8“ | …0038 |
22 mm |
9 mm |
12 mm |
4 mm |
| G 1/2“ | …0012 |
26 mm |
12 mm |
12 mm |
4 mm |
| G 3/4“ | …0034 |
32 mm |
17 mm |
12 mm |
4 mm |
| G 1“ | …0100 |
38 mm |
22 mm |
13.5 mm |
4.5 mm |
| G 1 1/4“ | …0114 |
48 mm |
28 mm |
14.5 mm |
4.5 mm |
| G 1 1/2“ | …0112 |
55 mm |
33 mm |
16 mm |
5 mm |
| G 2“ | …0200 |
70 mm |
43 mm |
16.5 mm |
5 mm |
| Metric thread DIN 13 | |||||
| M 16x1.5 | …1615 |
22 mm |
9 mm |
12 mm |
4 mm |
| M 18x1.5 | …1815 |
22 mm |
9 mm |
12 mm |
4 mm |
| M 20x1.5 | …2015 |
26 mm |
12 mm |
12 mm |
4 mm |
| M 22x1.5 | …2215 |
26 mm |
12 mm |
12 mm |
4 mm |
| M 24x1.5 | …2415 |
30 mm |
15 mm |
12 mm |
4 mm |
| M 26x1.5 | …2615 |
32 mm |
17 mm |
12 mm |
4 mm |
| M 27x1.5 | …2715 |
32 mm |
17 mm |
12 mm |
4 mm |
| M 30x1.5 | …3015 |
36 mm |
20 mm |
13 mm |
4.5 mm |
| M 33x1.5 | …3315 |
38 mm |
22 mm |
13.5 mm |
4.5 mm |
| M 35x1.5 | …3515 |
42 mm |
25 mm |
13.5 mm |
4.5 mm |
| M 36x1.5 | …3615 |
42 mm |
25 mm |
13.5 mm |
4.5 mm |
| M 42x1.5 | …4215 |
48 mm |
28 mm |
14.5 mm |
4.5 mm |
| M 48x1.5 | …4815 |
55 mm |
33 mm |
16 mm |
5 mm |
| M 60x2 | …6020 |
70 mm |
43 mm |
16.5 mm |
5 mm |
Other thread sizes, special seals (e.g. Viton), glasses or unpainted sight star as well as hexagon version on request.
* White painted sight star: Depending on the application, the customer must check the durability of the paint before use, as the paint may peel off depending on the composition of the medium, temperature, etc. If in doubt, we recommend oil sight glasses with an unpainted (“colourless”, brass-coloured) reflector.