How long is the life of a basic round wire coil spring?

Unfortunately, there are no specific test values as reference regarding the life of a round wire coil spring because there is individual difference to a certain extent and the installation conditions are complicated. The usage count varies with the operating temperature, environment, and amount of deformation. To increase the usage count, it is recommended to use the spring up to 70% of the allowable displacement Fmax..

What are the JIS standards for general spring-related materials?

Piano wires: JIS G 3522 Iron wires: JIS G 3532 Hard drawn steel wires: JIS G 3521 Stainless steel wires for springs: JIS G 4313

What influence will the usage without a spring rail have on the spring?

The usage without a spring rail will cause buckling of the spring, bending of its body and other problems, leading to breakage due to high stress locally generated on the inner side of the bending part. To ensure the service life of the spring, install the spring using the shaft, outer diameter guide rail, etc. ※Basically, it is ideal to use the spring on the intermediate shaft of the inner diameter side guide rail, passing it through from the upper surface to the lower surface.

What influence will the usage count of more than 300,000 times beyond the maximum displacement (when used close to the solid length) have on the spring?

The usage count of more than 300,000 times beyond the maximum displacement (when used close to the solid length) will cause high stress breakage above the calculated value on the section. In addition, near the solid length, the effective coil part will gradually get close and the spring constant will increase. Therefore, be sure to use within the allowable displacement Fmax.(mm).

What is the difference between a piano steel wire spring and a hard drawn steel wire spring?

There is little difference in appearance between the two materials. In short, the piano wire is an advanced material, and the hard drawn steel wire is a general material. The piano wire is often used as a spring for precision machinery while the hard drawn steel wire is mostly used as a peripheral spring for groceries or blinds. They are both high-carbon steels with almost the same chemical composition. The production of piano wires is time-consuming and they are expensive because there is additional standardized management and inspection of impurities, the depth of surface scars, and the depth of decarburized layer. Although the subtle difference is invisible to the naked eye, it has a great influence on the quality of the spring.

Notice of End of Sales for Economy Series Pneumatic Equipment Category. More information.

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Part Number Complete

C-UR8-15

type Free Length L Inner Dia. D-2d (or D) Outer Dia. D (or D1) Height with the max. load applied ([Free Length] – [Allowable Deflection]) Spring Constant Allowable Load (Configurable Range) Max. Load Wire Dia. End Surface Status Total Coils Solid Length Allowable Displacement CAD Days to Ship

Specification/Dimensions

type
- C-UF
- C-UR
- C-UV
- C-UY
Clear
Free Length L(mm)
5

10

15

20

25

30

35

40
Clear
Inner Dia. D-2d (or D)(Ø)
1.54

1.6

1.64

1.7

1.74

2.3

2.36

2.4

2.48

2.5

2.54

2.6

2.64

2.7

3.1

3.2

3.24

3.3

3.36

3.4

3.42

3.48

3.54

3.6

3.64

4

4.1

4.2

4.24

4.3

4.36

4.4

4.42

4.48

4.54

4.7

4.8

4.9

5

5.2

5.24

5.3

5.36

5.4

5.48

6.5

6.6

6.7

6.8

6.9

7

7.1

7.2

7.3

7.4

8.3

8.4

8.6

8.7

8.8

8.9

9

10.4

10.9

13.8

17.4
Clear
Outer Dia. D (or D1)(Ø)
2

3

4

5

6

8

10

12

16

20
Clear
Height with the max. load applied ([Free Length] – [Allowable Deflection])(mm)
1

1.25

1.5

2

2.5

2.75

3

3.75

4

5

5.5

6

6.25

7

7.5

8

8.25

8.3

8.75

10

11

12

13.7

13.75

13.8

14

16.5

19.25

19.3
Clear
Spring Constant(N/mm)
0.05

0.098

0.2

0.29

0.3

0.49

0.98
Clear
Allowable Load (Configurable Range)(N)
- ~1.50
- 1.51~4.50
- 4.51~8.50
- 8.51~16.00
Clear
Max. Load(N)
0.15

0.18

0.29

0.34

0.35

0.37

0.44

0.49

0.53

0.66

0.7

0.74

0.88

0.9

0.98

1.1

1.3

1.4

1.47

1.5

1.8

1.84

2.2

2.206

2.21

2.26

2.6

2.94

3.2

3.3

3.5

3.68

4.4

4.41

5.1

5.3

5.5

6.2

6.6

6.7

7.6

7.7

11.1
Clear
Wire Dia.(Ø)
0.13

0.15

0.18

0.2

0.23

0.25

0.26

0.29

0.3

0.32

0.35

0.38

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

1.1

1.3
Clear
End Surface Status
- With Grinding
- Without Grinding
Clear
Total Coils
3.7

3.8

4.3

4.4

4.8

5

5.3

5.5

5.7

5.9

6

6.1

6.2

6.3

6.5

6.7

6.8

7

7.3

7.4

7.5

7.6

8

8.1

8.4

8.5

9

9.3

9.5

9.7

9.9

10

10.1

10.2

10.5

10.8

11

12

12.9

13

14

14.1

14.5

15

15.1

15.5

16

17

19

19.7

20.1

23

23.5

25.1
Clear
Solid Length(mm)
1.05

1.1

1.2

1.24

1.4

1.5

1.6

1.7

1.8

1.82

1.84

1.9

2

2.1

2.19

2.35

2.5

2.6

2.64

2.7

2.71

2.86

2.9

3

3.15

3.2

3.25

3.3

3.4

3.45

3.5

3.6

3.61

3.85

4.16

4.2

4.4

4.5

4.6

4.64

4.95

5

5.2

5.32

5.4

5.6

5.9

6

6.1

6.15

6.2

6.3

6.4

6.8

7

7.2

7.43

7.7

7.75

8

8.4

9.1

9.3

9.5

9.6

10.4

10.5

10.8

12.1

12.25

12.8

13.5

15.6
Clear
Allowable Displacement(mm)
2.25

2.5

3

3.5

3.75

4

4.5

5

6

6.7

6.75

7

7.5

9

11

11.2

11.25

11.3

12

13.5

14

15

15.7

15.75

18

18.75

21

22.5

26.25

28
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

Same day
Clear

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Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Light Load (C-UR8-15)

Name: Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Light Load
Brand: MISUMI
Price: 116.55 INR
Availability: InStock

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Product Description

[Features]·This is an outer diameter standard type spring. Note that this product is manufactured with priority given to the outer diameter tolerance. ·Although it is a stainless steel spring, it is magnetic. Please note.

Economy Round Wire Coil Springs

Stainless Steel Light Load Reliable

- Manufactured with stainless steel SUS304-WPB for exceptional durability and precise performance.

- Choose from a wide range of inner diameters and free lengths to perfectly fit your needs.

- Ideal for ultra-light load applications with efficiency.

- Economical solution with quality that meets your standards, priced below standard products.

- Suitable for various industries with customizable spring constants.

MISUMI Standard

Cheaper Price

Product Variety

3D CAD
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Product Overview

♢When purchasing of Round Wire Springs, please note that this spring is the outer diameter standard type, manufactured with priority to the outer diameter tolerance, and suitable for hole installation occasions.
♢Stainless Round Wire Springs are also magnetic. Please be careful.

Dimensional Drawings

Outer Diameter D	φ10 or Less	Free Length L	50 or Less	±1.5mm
	φAbove 12		Above 60	±2.5mm

Material of Round Wire Springs
Material SUS304-WPB Spring Constant ±10%

Specification Table

■C-UV: Fmax. (allowable displacement) = L×Fa％

The outer diameter standard type gives priority to guaranteeing the outer diameter, while the inner diameter is for reference only.

Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
C-UV	3－	5＊	0.15	1.1	3.5	0.18	{0.018}	70
		10＊	0.18	2.5	7	0.35	{0.036}
		15＊	0.18	2.5	10.5	0.53	{0.054}
		20＊	0.20	3.3	14	0.70	{0.071}	70
		25＊	0.23	6.2	17.5	0.88	{0.089}	70
		30＊	0.23	6.2	21	1.05	{0.107}	70
	4－	5＊	0.18	1.2	3.5	0.18	{0.018}	70
		10＊	0.20	1.7	7	0.35	{0.036}
		15＊	0.23	3.0	10.5	0.53	{0.054}
		20＊	0.23	3.0	14	0.70	{0.071}

	5－	5＊	0.20	1.2	3.5	0.18	{0.018}	70
		10＊	0.23	1.8	7	0.35	{0.036}
		15＊	0.26	2.9	10.5	0.53	{0.054}
		20＊	0.29	4.5	14	0.70	{0.071}
	6－	10＊	0.26	2.0	7	0.35	{0.036}	70
		15＊	0.30	3.3	10.5	0.53	{0.054}	70
		20＊	0.30	3.3	14	0.70	{0.071}	70
	8－	10＊	0.30	1.9	7	0.35	{0.036}	70
		15＊	0.35	3.2	10.5	0.53	{0.054}
		20＊	0.35	3.2	14	0.70	{0.071}
		25＊	0.40	5.6	17.5	0.88	{0.089}
		30＊	0.40	5.6	21	1.05	{0.107}	70
		40＊	0.45	9.3	28	1.40	{0.143}	70
		50＊	0.45	9.3	35	1.75	{0.179}	70

■C－UY: Fmax. (allowable displacement) = L×Fa％

The outer diameter standard type gives priority to guaranteeing the outer diameter, while the inner diameter is for reference only.

Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
C-UY	2－	5＊	0.13	1.5	3.0	0.15	{0.015}	60
		10＊	0.13	1.5	6.0	0.29	{0.03}
		15＊	0.15	2.7	9.0	0.44	{0.045}
		20＊	0.15	2.7	12	0.59	{0.06}	60
		25＊	0.18	6.3	15	0.74	{0.076}	60
		30＊	0.18	6.3	18	0.88	{0.089}	60
	3－	5＊	0.16	0.92	3.75	0.37	{0.0378}	75
		10＊	0.20	2.0	7.5	0.74	{0.075}	75
		15＊	0.23	3.45	11.25	1.1	{0.1125}	75
		20＊	0.23	3.45	15	1.47	{0.15}	75
	4－	5＊	0.20	1.05	3.75	0.37	{0.0375}	75
		10＊	0.23	1.84	7.5	0.74	{0.075}
		15＊	0.26	2.86	11.25	1.1	{0.1125}
		20＊	0.29	4.64	15.0	1.47	{0.15}
		25＊	0.30	5.4	18.75	1.84	{0.1875}
		30＊	0.30	5.4	22.5	2.26	{0.23}
	5－	5＊	0.23	1.15	3.75	0.37	{0.0378}	75
		10＊	0.26	1.82	7.5	0.74	{0.075}	75
		15＊	0.30	3.15	11.25	1.1	{0.1125}
		20＊	0.30	3.15	15.0	1.47	{0.15}
		25＊	0.32	4.16	18.75	1.84	{0.1875}
	6－	5＊	0.26	1.24	3.5	0.34	{0.035}	70
		10＊	0.30	2.1	7.5	0.74	{0.075}	75
		15＊	0.32	2.64	11.25	1.1	{0.1125}
		20＊	0.35	3.85	15.0	1.47	{0.15}
		25＊	0.38	5.32	18.75	1.84	{0.1875}
		30＊	0.40	6.8	22.5	2.21	{0.225}
		40＊	0.40	6.8	30	2.94	{0.3}	75
	8－	10＊	0.35	2.19	7.5	0.74	{0.075}	75
		15＊	0.40	3.4	11.25	1.1	{0.1125}
		20＊	0.40	3.4	15.0	1.47	{0.15}
		25＊	0.45	5.4	18.75	1.84	{0.1875}
		30＊	0.45	5.4	22.5	2.21	{0.225}
		40＊	0.50	8.3	30	2.94	{0.3}	75
	10－	10＊	0.50	3.25	6	1.18	{0.1204}	60
		15＊	0.50	3.25	11.25	2.21	{0.225}	75
		20＊	0.55	4.4	15.0	2.94	{0.3}
		25＊	0.55	4.4	18.75	3.68	{0.375}
		30＊	0.60	6.15	22.5	4.41	{0.45}
		35＊	0.60	6.3	26.25	5.1	{0.52}
	12－	15＊	0.55	3.3	11.25	2.206	{0.225}	75

All the both ends marked with * are not ground.
● Calculation method of laps (reference value):
Total number of laps = solid length÷wire diameter (d)-1
Effective laps=total number of laps-2
*The number of laps is a reference value. There may be some variations depending on the lot.

The values of compression length are for reference only. There may be some variations depending on the lot.
And if it is used under the limit condition of compression length, the spring may be deformed, or damaged after using only a limited number of cycles.

Be sure to use within the allowable displacement Fmax.(mm).

■C-UR: Fmax. (allowable displacement) = L×Fa％

The outer diameter standard type gives priority to guaranteeing the outer diameter, while the inner diameter is for reference only./ tr>

Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
C-UR	2－	5＊	0.18	2.0	2.5	0.49	{0.05}	50
		10＊	0.18	2.0	5	0.98	{0.1}
		15＊	0.23	6.0	7.5	1.5	{0.15}
		20＊	0.23	6.0	10	2.0	{0.2}	50
	3－	5＊	0.23	1.6	3	0.9	{0.09}	60
		10＊	0.25	2.1	6	1.8	{0.18}
		15＊	0.30	4.5	9	2.6	{0.27}
		20＊	0.30	4.5	12	3.5	{0.36}
		25＊	0.32	6.4	15	4.4	{0.45}
		30＊	0.32	6.4	18	5.3	{0.45}	60
	4－	5＊	0.26	1.4	3	0.9	{0.09}	60
		10＊	0.29	2.0	6	1.8	{0.18}
		15＊	0.32	3.0	9	2.6	{0.27}
		20＊	0.38	6.1	12	3.5	{0.36}
		25＊	0.38	6.1	15	4.4	{0.45}
		30＊	0.40	8.0	18	5.3	{0.54}
		45＊	0.45	14.4	27	7.9	{0.81}	60
	5－	10＊	0.35	2.71	6	1.8	{0.18}	60
		15＊	0.38	3.61	9	2.6	{0.27}
		20＊	0.38	3.61	12	3.5	{0.36}
		25＊	0.45	7.43	15	4.4	{0.45}
		30＊	0.45	7.43	18	5.3	{0.54}
		35＊	0.50	12.25	21	6.2	{0.63}
	6－	5＊	0.32	1.5	3	0.9	{0.09}	60
		10＊	0.40	3.0	6	1.8	{0.18}
		15＊	0.40	3.0	9	2.6	{0.27}
		20＊	0.50	7.0	12	3.5	{0.36}
		25＊	0.50	7.0	15	4.4	{0.45}
		30＊	0.50	7.0	18	5.3	{0.54}
	8－	10＊	0.45	2.6	6	1.8	{0.18}	60
		15＊	0.50	3.6	9	2.6	{0.27}
		20＊	0.50	3.6	12	3.5	{0.36}
		25＊	0.55	5.9	15	4.4	{0.45}
		30＊	0.65	10.4	18	5.3	{0.54}
		35＊	0.65	10.4	21	6.2	{0.63}
		40＊	0.70	15.4	24	7.1	{0.72}	60
		60＊	0.80	27.6	31.2	10.6	{1.08}	52
	10－	10＊	0.55	3.3	6	1.8	{0.18}	60
		15＊	0.60	4.2	9	2.6	{0.27}
		20＊	0.65	6.2	12	3.5	{0.36}
		25＊	0.65	6.2	15	4.4	{0.45}
		30＊	0.70	8.4	18	5.3	{0.54}
	12－	60＊	0.90	16.2	36	10.6	{1.08}	60
	16－	20＊	0.80	5.4	12	3.5	{0.36}	60

All the two end faces marked with * are not ground.

The values of compression length are for reference only. There may be some variations depending on the lot.

Be sure to use within the allowable displacement Fmax.(mm).

■C-UF: Fmax. (allowable displacement) = L×45％

The outer diameter standard type gives priority to guaranteeing the outer diameter, while the inner diameter is for reference only.

Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
Type	D－L		d	Compression Length	F max.	N{kgf} max.		Fa％
C-UF	2－	5＊	0.2	2.35	2.25	0.66	{0.068}	45
		10＊	0.2	2.35	4.5	1.3	{0.14}	45
	3－	5＊	0.26	1.8	2.25	1.1	{0.11}	45
		10＊	0.32	4.5	4.5	2.2	{0.22}
		15＊	0.32	4.5	6.7	3.2	{0.33}
		20＊	0.35	6.3	9.0	4.4	{0.45}
		25＊	0.35	6.3	11.2	5.5	{0.56}
	4－	5＊	0.32	2.0	2.25	1.1	{0.11}	45
		10＊	0.35	3.0	4.5	2.2	{0.22}
		15＊	0.4	5.2	6.7	3.2	{0.33}
		20＊	0.4	5.2	9.0	4.4	{0.45}
		25＊	0.45	9.5	11.2	5.5	{0.56}
		30＊	0.45	9.5	13.5	6.6	{0.67}
	5－	10＊	0.4	3.2	4.5	2.2	{0.23}	45
		15＊	0.4	3.2	6.75	3.3	{0.34}
		20＊	0.45	4.95	9.0	4.4	{0.45}
		25＊	0.45	4.95	11.25	5.5	{0.56}
		30＊	0.5	7.75	13.5	6.7	{0.68}
		35＊	0.5	7.75	15.75	7.7	{0.79}
	6－	10＊	0.5	5.0	4.5	2.2	{0.22}	45
		15＊	0.55	7.7	6.7	3.2	{0.33}
		20＊	0.55	7.7	9.0	4.4	{0.45}
		25	0.6	10.8	11.2	5.5	{0.56}
		30	0.65	15.6	13.5	6.6	{0.67}
	8－	10	0.6	5.4	4.5	2.2	{0.22}	45
		15	0.65	7.2	6.7	3.2	{0.33}
		20	0.7	10.5	9.0	4.4	{0.45}
		25	0.7	10.5	11.2	5.5	{0.56}
		30	0.75	13.5	13.5	6.6	{0.67}
		35	0.75	13.5	15.7	7.6	{0.78}
		40	0.8	18.4	18	8.8	{0.89}	45
	10－	15	0.65	4.6	6.7	3.2	{0.33}	45
		20	0.8	9.6	9.0	4.4	{0.45}
		25	0.8	9.6	11.2	5.5	{0.56}
		30	0.85	12.8	13.5	6.6	{0.67}
	12－	15	0.8	6.8	6.7	3.2	{0.33}	45
		20	0.8	6.8	9.0	4.4	{0.45}	45
		25	0.8	6.8	11.2	5.5	{0.56}	45
	16－	35	1.1	12.1	15.7	7.6	{0.78}	45
	20－	20	1.2	7.2	9	8.8	{0.89}	45
		25	1.3	9.1	11.3	11.1	{1.13}	45
		70	1.7	26.4	31.5	30.9	{3.15}	45

Both ends of UF models with * are not ground.

The values of compression length are for reference only. There may be some variations depending on the lot.

Product Features

Different from ordinary springs on the market, MISUMIRound Wire Springs are more precise and refined, divided into the inner diameter standard type and the outer diameter standard type, the former of which is manufactured givingpriority to the inner diameter tolerance while the latter is manufactured giving priority to the outer diameter tolerance.

Select an appropriate Round Wire Springs type according to the actual installation situation, and refer to the published content for the specific inner and outer diameter tolerance values.
* The solid length is a reference value. If it is used under the limit condition of the solid length, the spring may be deformed, or damaged after using only a limited number of times. Therefore, use within the allowable displacementFmax.(mm).
To increase the usage count, it is recommended to use the spring up to 70% of the allowable displacement Fmax..

Installation Diagram of Outer Diameter Standard Type Round Wire Coil Spring, Round Wire Springs

Example of Use of Round Wire Springs

Hole Reference Positioning Mechanism
A Round Wire Springs is mechanism for positioning the workpiece based on the hole reference.
Loosening during positioning can be reduced by using a tapered pin to eliminate the deviation caused by the tolerance of each workpiece hole.
Select the compression spring to move from the beginning of the positioning contact with the workpiece.

Precautions

Precautions for use of Round Wire Springs
Operating temperature of Round Wire Springs
SWP-A……Normal temperature (0~40℃)
Stainless steel……-10~100℃
Spring oil tempered steel wire……Normal temperature (0~40℃)
*If the spring is used under conditions exceeding the above temperature, the load value may decrease due to usage conditions.
*When used in an environment with high and low temperature differences and humidity such as outdoors, it is recommended to choose stainless steel products.
* Heat-resistant springs can also be used. For details, refer to the Plastic Mold Components Catalog.
Stainless steel springs are also magnetic. Please be careful.

Related Products


(Economy series) Round Wire Springs - Outer Diameter Standard Stainless Steel, Ultra Light Load, Spring Constant 0.05 to 0.98 N/mm	(Economy series) Round Wire Springs - Inner Diameter Standard Stainless Steel, Light Load, Spring Constant 0.29 to 0.49 N/mm	(Economy series) Round Wire Springs - Outer Diameter Standard Stainless Steel, Heavy Load, Spring Constant 2.0 to 14.7 N/mm
Reason for Recommendation: MISUMI Basic Round Wire Springs, Outer Diameter Standard Type, Ultra Light Load Type	Reason for Recommendation: MISUMI Basic Round Wire Springs, Inner Diameter Standard Type, Light Load Type	Reason for Recommendation: MISUMI Basic Round Wire Springs, Outer Diameter Standard Type, Heavy Load Type

Part Number

Incomplete part number.
Please use left hand selections to complete a part number.

: 30; 45; 60

Part Number
C-UR8-15

Part Number	Price	Minimum Order Qty.	Volume Discount	Days to Ship	RoHS	Free Length L (mm)	Inner Dia. D-2d (or D) (Ø)	Outer Dia. D (or D1) (Ø)	Height with the max. load applied ([Free Length] – [Allowable Deflection]) (mm)	Spring Constant (N/mm)	Allowable Load (Configurable Range) (N)	Max. Load (N)	Wire Dia. (Ø)	End Surface Status	Total Coils	Solid Length (mm)	Allowable Displacement (mm)
	₹ 116.55	100 Piece(s)	Available	Same day	10	15	7	8	6	0.29	1.51~4.50	2.6	0.5	Without Grinding	6.2	3.6	9

Basic Information

Material	SUS304-WPB

Please check the type/dimensions/specifications of the part C-UR8-15 in the Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Light Load series.

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently asked question (FAQ)

Question: How long is the life of a basic round wire coil spring?: Answer: Unfortunately, there are no specific test values as reference regarding the life of a round wire coil spring because there is individual difference to a certain extent and the installation conditions are complicated.
The usage count varies with the operating temperature, environment, and amount of deformation. To increase the usage count, it is recommended to use the spring up to 70% of the allowable displacement Fmax..
Question: What are the JIS standards for general spring-related materials?: Answer: Piano wires: JIS G 3522
Iron wires: JIS G 3532
Hard drawn steel wires: JIS G 3521
Stainless steel wires for springs: JIS G 4313
Question: What influence will the usage without a spring rail have on the spring?: Answer: The usage without a spring rail will cause buckling of the spring, bending of its body and other problems, leading to breakage due to high stress locally generated on the inner side of the bending part. To ensure the service life of the spring, install the spring using the shaft, outer diameter guide rail, etc.
※Basically, it is ideal to use the spring on the intermediate shaft of the inner diameter side guide rail, passing it through from the upper surface to the lower surface.
Question: What influence will the usage count of more than 300,000 times beyond the maximum displacement (when used close to the solid length) have on the spring?: Answer: The usage count of more than 300,000 times beyond the maximum displacement (when used close to the solid length) will cause high stress breakage above the calculated value on the section. In addition, near the solid length, the effective coil part will gradually get close and the spring constant will increase. Therefore, be sure to use within the allowable displacement Fmax.(mm).
Question: What is the difference between a piano steel wire spring and a hard drawn steel wire spring?: Answer: There is little difference in appearance between the two materials. In short, the piano wire is an advanced material, and the hard drawn steel wire is a general material.
The piano wire is often used as a spring for precision machinery while the hard drawn steel wire is mostly used as a peripheral spring for groceries or blinds.
They are both high-carbon steels with almost the same chemical composition. The production of piano wires is time-consuming and they are expensive because there is additional standardized management and inspection of impurities, the depth of surface scars, and the depth of decarburized layer.
Although the subtle difference is invisible to the naked eye, it has a great influence on the quality of the spring.

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Product variants

Part Number
C-UF10-30
C-UF12-20
C-UF16-35
C-UR8-20
C-UR8-25
C-UR8-30

Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	RoHS	Free Length L (mm)	Inner Dia. D-2d (or D) (Ø)	Outer Dia. D (or D1) (Ø)	Height with the max. load applied ([Free Length] – [Allowable Deflection]) (mm)	Spring Constant (N/mm)	Allowable Load (Configurable Range) (N)	Max. Load (N)	Wire Dia. (Ø)	End Surface Status	Total Coils	Solid Length (mm)	Allowable Displacement (mm)
₹ 123.74	100 Piece(s)		Same day Stock	10	30	8.3	10	16.5	0.49	4.51~8.50	6.6	0.85	With Grinding	14.1	12.8	13.5
₹ 121.87	100 Piece(s)		Same day Stock	10	20	10.4	12	11	0.49	1.51~4.50	4.4	0.8	With Grinding	7.5	6.8	9
₹ 133.70	100 Piece(s)		Same day Stock	10	35	13.8	16	19.3	0.49	4.51~8.50	7.6	1.1	With Grinding	10	12.1	15.7
₹ 113.00	100 Piece(s)	Available	Same day Stock	10	20	7	8	8	0.29	1.51~4.50	3.5	0.5	Without Grinding	6.2	3.6	12
₹ 113.00	100 Piece(s)		Same day Stock	10	25	6.9	8	10	0.29	1.51~4.50	4.4	0.55	Without Grinding	9.7	5.9	15
₹ 113.00	100 Piece(s)	Available	Same day Stock	10	30	6.7	8	12	0.29	4.51~8.50	5.3	0.65	Without Grinding	15	10.4	18

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type

Free Length L(mm)

Inner Dia. D-2d (or D)(Ø)

Outer Dia. D (or D1)(Ø)

Height with the max. load applied ([Free Length] – [Allowable Deflection])(mm)

Spring Constant(N/mm)

Allowable Load (Configurable Range)(N)

Max. Load(N)

Wire Dia.(Ø)

End Surface Status

Total Coils

Solid Length(mm)

Allowable Displacement(mm)

CAD

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Specify Alterations

Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Light Load (C-UR8-15)

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Product Description

Economy Round Wire Coil Springs

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Example of Use of Round Wire Springs

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