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Extension spring

Tension spring (also known as tension spring, referred to as tension spring for short) is a spiral spring that bears axial tension. Generally, tension springs are made of round section materials. When not under load, the coils of the tension spring are generally tight without clearance.

Serial Number

Part Number

Material

Wire Diameter
（mm）

Outside Diameter
（mm）

Free Length
（mm）

Effective circle

Winding ratio

N Initial Tension

Rate （N/mm）

1	3.5.01.11.001.01	music wire	1.60	12.60	84.00	17.50	6.88	11.11	2.76
2	3.5.01.14.001.01	music wire	1.60	12.60	57.00	13.50	6.88	11.11	3.57
7	3.9.01.011.033.01	music wire	4.50	38.50	668.50	115.00	7.56	74.73	0.89
10	3.9.01.011.054.01	music wire	1.90	17.78	66.80	21.75	8.36	10.69	1.47
12	3.9.01.011.058.01	music wire	1.50	11.50	62.00	20.50	6.67	10.21	2.42
13	3.9.01.011.059.01	music wire	2.40	14.50	85.00	22.50	5.04	51.59	8.16
14	3.9.01.27.001.01	music wire	1.60	8.00	46.00	10.50	4.00	25.89	23.33
16	3.9.01.011.076.01	music wire	2.00	15.70	107.00	38.25	6.85	17.66	1.59
17	3.9.01.011.073.01	music wire	0.80	5.60	50.00	49.15	6.00	3.43	0.74
23	3.9.01.011.079.01	music wire	1.00	16.00	50.00	9.40	15.00	0.60	0.31
24	3.9.01.011.080.01	music wire	1.00	16.00	135.00	94.40	15.00	0.60	0.03
25	3.9.01.011.081.01	music wire	1.00	16.00	250.00	209.40	15.00	0.60	0.01
26	3.9.01.011.082.01	music wire	1.50	24.00	135.00	60.00	15.00	1.35	0.07
27	3.9.01.011.083.01	music wire	1.50	24.00	250.00	139.40	15.00	1.35	0.03
28	3.9.01.011.085.01	music wire	1.00	8.00	35.00	19.00	7.00	4.82	1.50
29	3.9.01.011.091.01	music wire	3.50	22.00	230.00	53.50	5.29	87.37	4.34
31	3.5.01.16.001.01	music wire	0.70	7.90	53.40	53.50	10.29	1.03	0.12
34	3.9.01.011.095.01	music wire	1.80	10.80	86.00	35.50	5.00	24.17	3.98
37	3.4.01.06.01	music wire	1.60	30.05	28.95	17.00	17.78	8.00	0.16
39	3.3.01.01.004.01	music wire	1.00	10.00	90.00	69.00	9.00	2.57	0.19
41	3.3.01.06.004.01	music wire	1.00	10.00	95.00	74.00	9.00	2.57	0.18
42	3.3.01.09.001.01	music wire	1.00	10.00	90.00	69.00	9.00	2.57	0.19
43	3.4.01.07.001.01	music wire	0.90	6.10	87.90	73.00	5.78	4.95	0.63
44	3.4.01.08.002.01	music wire	1.30	13.00	130.00	70.25	9.00	4.28	0.25

Reference

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Free Length

Outside Diameter

Loop Length

Wire Diameter