Metric Size, Round or Square
Construction Tubings
For Tube Clamp Connectors
GN 990 / GN 990-NI



RoHS Compliant



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Specification
Information

Construction tubing:
Steel, zinc-plated, blue anodized
Aluminum, blank, untreated
Aluminum, anodized, natural color
Stainless steel, European Standard No. 1.4301 (American Standard Series 304), untreated
Sawed cross sections deburred blank; i.e., not surface treated


GN 990 construction tubings can be supplied in any length up to 3000 mm.
The tolerances specified for the outside diameter of the round construction tubings comply with the requirements for split mono-block connector clamps. Otherwise the tolerances comply with DIN 2391, DIN 2395 and DIN 2462.
Two-piece connector clamps obviously allow larger tolerances on round and square construction tubings.
Other lengths of tubing, in 1 mm increments up to 3000 mm, available upon request.
For end plugs, see GN 991.

 
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Round Type

Dimensions in:

millimeters
(inches)
Part Number
d1
Diameter (D)
Length l
+/-0.5 mm
d2
w1
w2
Steel, Zinc Plated
Aluminum, Blank

Aluminum,
Anodized
Stainless Steel
10
(.39)
1000
(39.37)
7
(.28)
1.5
(.06)
-
12
(.47)
9
(.35)
1.5
(.06)
-
14
(.55)
11
(.43)
1.5
(.06)
-
15
(.59)
12
(.47)
1.5
(.06)
-
16
(.63)
13
(.51)
1.5
(.06)
-
18
(.71)
15
(.59)
1.5
(.06)
-
20
(.79)
16
(.63)
2
(.08)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
2
(.08)
32
(1.26)
28
(1.10)
2
(.08)
-
35
(1.38)
31
(1.22)
2
(.08)
-
40
(1.57)
34
(1.34)
3
(.12)
3
(.12)
-
42
(1.65)
36
(1.42)
3
(.12)
-
-
45
(1.77)
39
(1.54)
3
(.12)
3
(.12)
-
48
(1.89)
42
(1.65)
3
(.12)
-
50
(1.97)
44
(1.73)
3
(.12)
3
(.12)
-
-
60
(1.97)
52
(2.05)
4
(.16)
-
 
Square Type

Dimensions in:

millimeters
(inches)
Part Number
s1
Diameter (V)
Length l
+/-0.5 mm
s2
w1
w2
Steel, Zinc Plated
Aluminum, Blank

Aluminum,
Anodized
Stainless Steel
20
(.79)
39.37
(1000)
16
(.63)
2
(.08)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
2
(.08)
40
(1.57)
34
(1.34)
3
(.12)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
3
(.12)