Page 23 - FAQ & A

10-Coil Measurement
20-Coil Measurement
Wire Size
in
cm
in
cm
1 3/4ʺ
4.50
3 1/2ʺ
8.99
0.1770
1 7/8ʺ
4.76
3 3/4ʺ
9.53
0.1875
1 15/16ʺ
4.88
3 7/8ʺ
9.75
0.1920
2ʺ
5.08
4ʺ
10.16
0.2000
2 1/16ʺ
5.26
4 1/8ʺ
10.52
0.2070
2 3/16ʺ
5.55
4 3/8ʺ
11.11
0.2187
2 1/4ʺ
5.72
4 1/2ʺ
11.45
0.2253
2 5/16ʺ
5.95
4 5/8ʺ
11.90
0.2343
2 3/8ʺ
6.02
4 3/4ʺ
12.04
0.2375
2 7/16ʺ
6.19
4 7/8ʺ
12.38
0.2437
2 1/2ʺ
6.35
5ʺ
12.70
0.2500
2 5/8ʺ
6.67
5 1/4ʺ
13.34
0.2625
2 3/4ʺ
6.93
5 1/2ʺ
13.87
0.2730
2 13/16ʺ
7.19
5 5/8ʺ
14.38
0.2830
Step 4: Measure Length of Spring
Use a tape measure to measure the length of the spring to the nearest half of an inch. Measure springs only when relaxed because the winding adds significant overall length while reducing the coiled diameter.
If you have a paired design, and one is broken and one is intact, then don’t try to measure the length of the intact spring with the door down.
A wound spring has 7 or 8 turns adding to the overall length, and will, therefore be about 2ʺ longer than when relaxed.
Measure the lengths of the broken spring, which will be unwound, and add them together. Measure spring only does not include the length of winding and anchor cones.