Inch and Metric Size, Round or Square, Steel
Construction Tubings
For Tube Clamp Connectors
GN 990-ST



RoHS Compliant



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Specification
Information

Construction tubing:
Steel, zinc-plated, blue passivated

Sawed end surfaces untreated, but deburred


The tolerances specified for the outside diameter of the round construction tubings comply with the requirements for split mono-block connector clamps. Inch tubing complies with ASTM A513-5. Metric tubing complies 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, also available upon request.
Inch size tubing available upon request. Metric plain steel tubing available upon request.
For end plugs, see GN 991.

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Inch Table - Round Type

Dimensions in:

inches
(millimeters)
Part Number
d1
Diameter (D)
Length l
+/-0.02 in.
d2
w1
.500
(12.7)
12.0
(304.8)
.384
(.28)
.058
(1.5)
.625
(15.9)
.509
(.35)
.058
(1.5)
.750
(19.1)
.634
(.43)
.058
(1.5)
1.000
(.25.4)
.834
(.47)
.083
(2.0)
1.250
(31.8)
1.084
(.51)
.083
(2.0)
1.500
(38.1)
1.334
(.59)
.083
(2.0)
1.750
(44.5)
1.510
(.63)
.120
(3.0)
2.000
(50.8)
1.688
(.83)
.156
(4.0)
2.500
(63.5)
2.188
(1.02)
.156
(4.0)
.500
(12.7)
36.0
(914.4)
.384
(.28)
.058
(1.5)
.625
(15.9)
.509
(.35)
.058
(1.5)
.750
(19.1)
.634
(.43)
.058
(1.5)
1.000
(.25.4)
.834
(.47)
.083
(2.0)
1.250
(31.8)
1.084
(.51)
.083
(2.0)
1.500
(38.1)
1.334
(.59)
.083
(2.0)
1.750
(44.5)
1.510
(.63)
.120
(3.0)
2.000
(50.8)
1.688
(.83)
.156
(4.0)
2.500
(63.5)
2.188
(1.02)
.156
(4.0)
.500
(12.7)
72.0
(1828.8)
.384
(.28)
.058
(1.5)
.625
(15.9)
.509
(.35)
.058
(1.5)
.750
(19.1)
.634
(.43)
.058
(1.5)
1.000
(.25.4)
.834
(.47)
.083
(2.0)
1.250
(31.8)
1.084
(.51)
.083
(2.0)
1.500
(38.1)
1.334
(.59)
.083
(2.0)
1.750
(44.5)
1.510
(.63)
.120
(3.0)
2.000
(50.8)
1.688
(.83)
.156
(4.0)
2.500
(63.5)
2.188
(1.02)
.156
(4.0)
.500
(12.7)
96.0
(2438.4)
.384
(.28)
.058
(1.5)
.625
(15.9)
.509
(.35)
.058
(1.5)
.750
(19.1)
.634
(.43)
.058
(1.5)
1.000
(.25.4)
.834
(.47)
.083
(2.0)
1.250
(31.8)
1.084
(.51)
.083
(2.0)
1.500
(38.1)
1.334
(.59)
.083
(2.0)
1.750
(44.5)
1.510
(.63)
.120
(3.0)
2.000
(50.8)
1.688
(.83)
.156
(4.0)
2.500
(63.5)
2.188
(1.02)
.156
(4.0)
 
Metric Table - Round Type

Dimensions in:

millimeters
(inches)
Part Number
d1
Diameter (D)
Length l
+/-0.5 mm
d2
w1
10
(.39)
300
(11.81)
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)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
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)
42
(1.65)
36
(1.42)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
48
(1.89)
42
(1.65)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
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)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
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)
42
(1.65)
36
(1.42)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
48
(1.89)
42
(1.65)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
10
(.39)
2000
(78.7)
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)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
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)
42
(1.65)
36
(1.42)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
48
(1.89)
42
(1.65)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
10
(.39)
3000
(118.1)
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)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
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)
42
(1.65)
36
(1.42)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
48
(1.89)
42
(1.65)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
 
Metric Table - Square Type

Dimensions in:

millimeters
(inches)
Part Number
s1
Diameter (V)
Length l
+/-0.5 mm
s2
w2
20
(.79)
300
(11.81)
16
(.63)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
40
(1.57)
34
(1.34)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
20
(.79)
1000
(39.37)
16
(.63)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
40
(1.57)
34
(1.34)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
20
(.79)
2000
(78.7)
16
(.63)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
40
(1.57)
34
(1.34)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)
20
(.79)
3000
(118.1)
16
(.63)
2
(.08)
25
(.98)
21
(.83)
2
(.08)
30
(1.18)
26
(1.02)
2
(.08)
40
(1.57)
34
(1.34)
3
(.12)
45
(1.77)
39
(1.54)
3
(.12)
50
(1.97)
44
(1.73)
3
(.12)