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-VUM5-20

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 Max. Load Wire Dia. End Surface Status Total Coils Solid Length Allowable Displacement type Allowable Load (Configurable Range) CAD Days to Ship

Specification/Dimensions

Free Length L(mm)
15

20

25

30

35

40

45

50

60
Clear
Inner Dia. D-2d (or D)(Ø)
5

6

6.5

8

8.5

10

12

13.6

16

16.6
Clear
Outer Dia. D (or D1)(Ø)
6.2

6.6

6.8

7

7.4

7.6

7.8

8

9.8

10

10.2

12

12.2

12.4

12.6

14.4

19.6
Clear
Height with the max. load applied ([Free Length] – [Allowable Deflection])(mm)
9

9.75

12

13

15

16.25

18

19.5

21

22.75

26
Clear
Spring Constant(N/mm)
0.7

0.8

0.9

0.98

1

1.1

1.3

1.4

1.5

1.6

1.8

2.1

2.94

3.1
Clear
Max. Load(N)
5.88

7.84

9.8

11.76

13.72

15.39

20.58

25.68

30.87

35.97

41.16
Clear
Wire Dia.(Ø)
0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

1.6

1.8
Clear
End Surface Status
- With Grinding
- Without Grinding
Clear
Total Coils
6

7

7.5

8

9.5

10

10.5

12

13

13.5
Clear
Solid Length(mm)
4.8

6.3

6.8

7.7

8.4

8.5

8.8

9.5

10.4

11

11.7

12.6

12.7

14

14.4

14.5
Clear
Allowable Displacement(mm)
5.25

6

7

8

8.75

10

10.5

11.2

12

12.25

12.8

14

14.4

16

18

19.2

20

24
Clear
type
- C-VUL
- C-VUM
- E-NWL16.6-60
- E-NWL6.5-30
- E-NWL6.5-35
- E-NWL6.5-40
- E-NWL6.5-45
- E-NWL6.5-50
- E-NWL8.5-35
- E-NWL8.5-40
- E-NWL8.5-45
- E-NWM13.6-35
- E-NWM13.6-50
- E-NWM13.6-60
- E-NWM6.5-40
- E-NWM6.5-45
- E-NWM6.5-50
Clear
Allowable Load (Configurable Range)(N)
- 4.51~8.50
- 8.51~16.00
- 16.01~30.00
- 30.01~50.00
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

Same day
Clear

Specify Alterations

Round Wire Coil Springs, Defection I.D. Referenced, Stainless Steel, Heavy Load

Name: Round Wire Coil Springs, Defection I.D. Referenced, Stainless Steel, Heavy Load
Brand: MISUMI
Availability: InStock

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MiSUMi Economy

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Product Description

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

Economy Round Wire Coil Springs, Heavy Load

Heavy Load Sturdy Reliable

- Engineered for high-load applications without breaking the bank.

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

- Built with durable materials for superior performance.

- Tailor the spring’s specifications to match your requirements.

- Designed for precision and longevity in demanding conditions.

Economy Precision Index Plunger with Pilot (h7 Tolerance

MISUMI Standard

Cheaper Price

Product Variety

3D CAD
3D CAD Support

Product Overview

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

Dimensional Drawing

Inner Diameter D	φ8 or Less	Free Length L	50 or Less	±1mm
	φAbove 10		Above 60	±2mm

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

Specification Table

C-VUL: Fmax. (allowable displacement) = L×40%

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

Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Reference
Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Pitch	Solid Length	Total Number of Rolls
C-VUL	5 －	15	6.2	0.6	6	5.88	{0.60}	2.5	4.8	7
		20	6.2	0.6	8	7.84	{0.80}	3.3	4.8	7
		25	6.4	0.7	10	9.80	{1.00}	2.3	9.1	12
	6 －	15	7.4	0.7	6	5.88	{0.60}	2.1	6.3	8
		20	7.4	0.7	8	7.84	{0.80}	2.9	6.3	8
		25	7.6	0.8	10	9.80	{1.00}	2.3	10.4	12
		30			12	11.76	{1.20}	2.7
		35			14	13.72	{1.40}	3.2
		40	7.8	0.9	16	15.68	{1.60}	2.5	16.2	17
	8 －	20	9.8	0.9	8	7.84	{0.80}	2.4	9.5	9.5
		25	9.8	0.9	10	9.80	{1.00}	2.9	9.5	9.5
		30	10.0	1.0	12	11.76	{1.20}	2.5	14.0	13
		35	10.0	1.0	14	13.72	{1.40}	2.9	14.0	13
		60	10.4	1.2	24	23.52	{2.40}	2.7	28.8	23
	10 －	20	12.0	1.0	8	7.84	{0.80}	3.1	8.5	7.5
		25	12.0	1.0	10	9.80	{1.00}	3.8	8.5	7.5
		30	12.2	1.1	12	11.76	{1.20}	3.2	12.7	10.5
		35	12.2	1.1	14	13.72	{1.40}	3.7	12.7	10.5
		40	12.2	1.1	16	15.68	{1.60}	4.2	12.7	10.5
	12 －	25	14.4	1.2	10	9.80	{1.00}	2.9	12.6	9.5
		35	14.4	1.2	14	13.72	{1.40}	4.1	12.6	9.5
		55	14.8	1.4	22	21.56	{2.20}	4.1	21.7	14.5
	16 -	50	19.0	1.5	20	19.60	{2.00}	5.9	15.8	9.5

C-VUM: Fmax. (allowable displacement) = L×35%

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

Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Reference
Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Pitch	Solid Length	Total Number of Rolls
C-VUM	5 －	15	6.6	0.8	5.3	15.39	{1.57}	2.3	6.8	7.5
		20	6.8	0.9	7.0	20.58	{2.10}	1.8	11.7	12
		40	7.0	1.0	14.0	41.16	{4.20}	3.2	14.5	13.5
	6 －	15	7.8	0.9	5.3	15.39	{1.57}	2.3	7.7	7.5
		20	7.8	0.9	7.0	20.58	{2.10}	3.0	7.7	7.5
		25	8.0	1.0	8.8	25.68	{2.62}	2.8	11	10
		30	8.0	1.0	10.5	30.87	{3.15}	3.3	11	10
	8 －	20	10.2	1.1	7.0	20.58	{2.10}	3.3	8.8	7
		25	10.2	1.1	8.8	25.68	{2.62}	4.2	8.8	7
		30	10.2	1.1	10.5	30.87	{3.15}	5.0	8.8	7
		35	10.6	1.3	12.3	35.97	{3.67}	3.5	15.6	11
		40	10.6	1.3	14.0	41.16	{4.20}	4.0	15.6	11
	10 －	20	12.4	1.2	7.0	20.58	{2.10}	4.0	8.4	6
		25	12.6	1.3	8.8	25.68	{2.62}	4.2	10.4	7
		30	12.6	1.3	10.5	30.87	{3.15}	5.0	10.4	7
		40	13	1.5	14.0	41.16	{4.20}	3.8	18.8	11.5
	12 －	25	14.8	1.4	8.8	25.68	{2.62}	5.0	9.8	6
	16 －	35	19.6	1.8	12.3	35.97	{3.67}	5.8	14.4	7

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 will be some deviations among batches.

The solid length is a reference value. There will be slight differences among batches. Moreover, if it is used under the limit condition of the solid length, it may cause the spring to be deformed or be damaged after using only a limited number of times.

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

kgf (load)=N/mm (spring constant)×0.101972×F (displacement); {kgf}=N×0.101972

C-NWL: Fmax. (allowable deflection)=L×40%

Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Spring Constant N/mm{kgf/mm}		Reference Compression Length
C－NWL	6.5－	30^＊	8.1	0.8	12	13.7	{1.4}	1.1	{0.12}	9.6
		35^＊			14			1.0	{0.10}	10.8
		40^＊			16			0.9	{0.09}	12
		45^＊			18			0.8	{0.08}	13.2
		50^＊			20			0.7	{0.07}	14.4
	8.5－	35^＊	10.5	1	14	20.6	{2.1}	1.5	{0.15}	10.8
		40^＊			16			1.3	{0.13}	12
		45^＊			18			1.1	{0.12}	13
	16.6－	60^＊	19.8	1.6	24	27.5	{2.8}	1.1	{0.12}	20

C-NWL: Both ends are ground.

C-NWM: Fmax. (allowable deflection)=L×32%

Type	D－L		Outer Diameter D₁	Wire Diameter d	F max.	N{kgf} max.		Spring Constant N/mm{kgf/mm}		Reference Compression Length
C－NWM	6.5－	40^＊	8.5	1	12.8	20.6	{2.1}	1.6	{0.16}	17.5
		45^＊			14.4			1.4	{0.15}	19.5
		50^＊			16			1.3	{0.13}	21
	13.6－	35^＊	16.8	1.6	11.2	34.3	{3.5}	3.1	{0.31}	14.4
		50^＊			16			2.1	{0.22}	18.4
		60^＊			19.2			1.8	{0.18}	20.8

C-NWM: Both ends are ground.

■Spring Constant N/mm {kgf/mm}

Type

C-VUY

C-VUR

C-VUF

C-VUL

0.098
｛0.01｝

0.29
｛0.03｝

0.49
｛0.05｝

0.98
｛0.10｝

0.196
｛0.02｝

Fmax.

F=L×Fa%

F=L×60%

F=L×45%

F=L×40%

Product Features

Different from ordinary springs on the market, MISUMI Round 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 Inner Diameter Standard Type Round Wire Coil Spring

Example of Use

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, Ultra Heavy Load, Spring Constant 4.9 to 29.4N/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, Ultra Heavy Load Type

Part Number

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

: 30; 45; 60

Part Number
C-VUM5-20
C-VUM6-20
C-VUM6-25
C-VUM8-20
C-VUM8-25
C-VUM10-20
C-VUM10-25

Price	Minimum Order Qty.	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)
₹ 122.52	100 Piece(s)	Same day	10	20	5	6.8	13	2.94	16.01~30.00	20.58	0.9	With Grinding	12	11.7	7
₹ 127.12	100 Piece(s)	Same day	10	20	6	7.8	13	2.94	16.01~30.00	20.58	0.9	With Grinding	7.5	7.7	7
₹ 134.29	100 Piece(s)	Same day	10	25	6	8	16.25	2.94	16.01~30.00	25.68	1	With Grinding	10	11	8.75
₹ 130.87	100 Piece(s)	Same day	10	20	8	10.2	13	2.94	16.01~30.00	20.58	1.1	With Grinding	7	8.8	7
₹ 136.49	100 Piece(s)	Same day	10	25	8	10.2	16.25	2.94	16.01~30.00	25.68	1.1	With Grinding	7	8.8	8.75
₹ 136.00	100 Piece(s)	Same day	10	20	10	12.4	13	2.94	16.01~30.00	20.58	1.2	With Grinding	6	8.4	7
₹ 136.00	100 Piece(s)	Same day	10	25	10	12.6	16.25	2.94	16.01~30.00	25.68	1.3	With Grinding	7	10.4	8.75

Basic Information

Material	SUS304-WPB

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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Specification/Dimensions

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)

Max. Load(N)

Wire Dia.(Ø)

End Surface Status

Total Coils

Solid Length(mm)

Allowable Displacement(mm)

type

Allowable Load (Configurable Range)(N)

CAD

Days to Ship

Specify Alterations

Round Wire Coil Springs, Defection I.D. Referenced, Stainless Steel, Heavy Load

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Product Description

Economy Round Wire Coil Springs, Heavy Load

Product Overview

Dimensional Drawing

Specification Table

Product Features

Example of Use

Precautions

Related Products

Part Number

Basic Information

Frequently asked question (FAQ)

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