Tubing Stretch Information

Stretch Formula

Length = (pull force in thousands) x (length feet in thousands) x (stretch constant, in inches of stretch per thousand pounds of pull per thousand feet of length)

Example

If you are trying to determine the amount of stretch for 20,000 lbs of pull on 8000 ft of 2.875 OD, 6.5#, 2.441 ID tubing, do the following:

20 x 8 x 0.22075 (stretch constant for 6.5# 2.875 tubing) = 35.32 inches of stretch

Tubing

Size

O.D.

(Inches)

 Weight

(lb/ft)

I.D.

(Inches)

Wall Area

(sq. Inches)

Stretch Constant

(In/1000 lb /1000 ft)

Free Point

Constant

3/4 1.050 1.14
1.20
0.824
0.824
0.333
0.333
1.20120
1.20120
832.5
832.5
1 1.315 1.30
1.43
1.63
1.70
1.72
1.80
1.125
1.097
1.065
1.049
1.049
1.049
0.364
0.413
0.467
0.494
0.494
0.494
1.98900
0.96852
0.85653
0.80972
0.80972
0.80972
910.0
1032.5
1167.5
1235.0
1235.0
1235.0
1-1/4 1.660 2.10
2.30
2.33
2.40
1.410
1.380
1.380
1.380
0.603
0.669
0.669
0.669
0.66335
0.59751
0.59751
0.59751
1507.5
1672.5
1672.5
1672.5
1-1/2 1.900 2.40
2.60
2.72
2.75
2.76
2.90
1.650
1.610
1.610
1.610
1.610
1.610
0.697
0.799
0.799
0.799
0.799
0.799
0.57369
0.50063
0.50063
0.50063
0.50063
0.50063
1742.5
1997.5
1997.5
1997.5
1997.5
1997.5
2 2.000 3.30
3.40
1.670
1.670
0.951
0.951
0.42061
0.42061
2377.5
2377.5
2-1/16 2.063 2.66
3.25
3.30
3.40
1.813
1.751
1.751
1.751
0.761
0.935
0.935
0.935
0.52562
0.42781
0.42781
0.42781
1902.5
2337.5
2337.5
2337.5
2-3/8 2.375 3.10
3.32
4.00
4.60
4.70
5.30
5.80
5.95
6.20
7.70
2.125
2.107
2.041
1.995
1.995
1.939
1.867
1.867
1.853
1.703
0.884
0.943
1.158
1.304
1.304
1.477
1.692
1.692
1.733
2.152
0.45249
0.42418
0.34542
0.30675
0.30675
0.27082
0.23641
0.23641
0.23081
0.18578
2210.0
2375.5
2895.0
3260.0
3260.0
3692.5
4230.0
4230.0
4332.5
5380.0
2-7/8 2.875 4.36 2.579 1.268 0.31546 3170
4.64 2.563 1.333 0.30008 3332.5
6.4 2.441 1.812 0.22075 4530
6.5
7.9 2.323 2.254 0.17746 5635
8.6 2.259 2.484 0.16103 6210
8.7
8.9 2.243 2.54 0.15748 6350
9.5 2.195 2.708 0.14771 6770
10.4 2.151 2.858 0.13996 7145
11 2.065 3.143 0.12727 7857.5
11.65 1.995 3.366 0.11884 8415
3-1/2 3.500 5.63 3.188 1.639 0.24405 4097.5
5.75
7.7 3.068 2.228 0.17953 5570
9.2 2.992 2.59 0.15444 6475
9.3
10.2 2.922 2.915 0.13722 7287.5
10.3
12.8 2.764 3.621 0.11047 9052.5
12.95 2.75 3.682 0.10864 9205
13.7 2.673 4.01 0.09975 10025
14.7 2.601 4.308 0.09285 10770
15.1 2.602 4.304 0.09294 10760
15.8 2.524 4.618 0.08662 11545
17.05 2.44 4.945 0.08089 12362.5
4 4.000 9.4 3.548 2.68 0.14925 6700
9.5
10.8 3.476 3.077 0.13 7692.5
10.9
11
11.6 3.428 3.337 0.11987 8342.5
13.4 3.34 3.805 0.10512 9512.5
4-1/2 4.500 12.6 3.958 3.6 0.11111 9000
12.75
15.1 3.826 4.407 0.09076 11017.5
15.5
16.9 3.754 4.836 0.08271 12090
19.2 3.64 5.498 0.07275 13745