Aluminum
Oil Level Sight Glasses
With ESG Glass
GN 743.1
GN 743.1

 GN 743.1 GN 743.1
Specification
Information

Sight glass body: Aluminum, turned, with bright finish
Sight glass: ESG glass
Reflector: Heat resistant technopolymer plastic (Polysulfon)
Seal: Viton rubber

Oil level sight glasses GN 743.1 offer the following features:
1. Genuine glass of high stability and scratch proof.
2. Sealing with an O-ring on the periphery and not on the face edge of the glass. Leak tightness is therefore not affected by axial pressures.
The seal is housed in a groove and it can therefore not be lost. In addition, this groove prevents the seal from being extruded when the sight glass is tightened. The location of this seal allows also the softer elastomer which guarantees better and easier sealing.
Oil level sight glasses GN 743.1 can be used on pressurized oil tanks. Tests regarding maximum pressure are available upon request.
Viton seal: maximum heat resistance: 180°C (356°F).
Sight glasses may be ordered without reflectors.
Note: When mounting oil level sight glasses on walls of less than 4mm thickness, use nut GN 543.1.

See our Technical Section for pipe thread size details.
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Metric Thread Table

Dimensions in:

millimeters
(inches)
Part Number

d1
d2
Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
With Reflector
Without Reflector
11
(.43)
M16 x 1.5
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
725
14
(.55)
M20 x 1.5
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
725
18
(.71)
M26 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
18
(.71)
M27 x 1.5
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
24
(.94)
M33 x 1.5
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
290
32
(1.26)
M40 x 1.5
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180
32
(1.26)
M42 x 1.5
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180
BSPP Parallel Thread Table

Dimensions in:

millimeters
(inches)
Part Number

d1
d2
Pipe Thread
d3
l1
l2
s
Max Pressure,
psi @ 70°F
With Reflector
Without Reflector
11
(.43)
G 3/8"
22
(.87)
8
(.31)
7.5
(.30)
20
(.79)
725
14
(.55)
G 1/2"
26
(1.02)
8.5
(.33)
7.5
(.30)
23
(.91)
725
18
(.71)
G 3/4"
32
(1.26)
9
(.35)
8
(.31)
30
(1.18)
360
24
(.94)
G 1"
40
(1.57)
11
(.43)
8.5
(.33)
36
(1.42)
290
32
(1.26)
G 1 1/4"
50
(1.97)
12
(.47)
9
(.35)
46
(1.81)
180