What is the initial tension?

It can be understood that when a general tensile spring is under tension, the tension measured when it is about to undergo elastic deformation without deformation (critical state) is called the initial tension. It is realized by properly controlling the process parameters in the manufacturing process of tensile spring. MISUMI tension spring specifications (except for free designation) have been standardized, i.e. the maximum load of the same diameter is a certain value. Because the tensile spring is made on the basis of the maximum load, the initial tension and spring coefficient are the reference values.

What is the life of the tensile spring?

Some hook installation methods of tension springs may cause stress concentration, so the standard use times cannot be provided. To increase the use times, it is recommended to use it under 70% of the allowable displacement Fmax. ·It is recommended to use it at room temperature below 40℃ and the load value will decrease due to service conditions at temperature over 40℃.

What is the spring constant?

The spring constant is the force necessary to give the spring unit displacement, which is used to express the characteristics of the spring.

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 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.

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Part Number Complete

C-AUT5-15

Material Max. Load Length of Spring Used L+F Free Length L Outer Dia. D Initial Tension Standard Spring Constant Wire Dia. Max. Deflection type Allowable Load (Configurable Range) CAD Days to Ship

Specification/Dimensions

Material
- Stainless Steel Wire
  - SUS304-WPB
- SWP-A
Clear
Max. Load(N)
8.8

11.1

20.79

33.15

41.19

77.47
Clear
Length of Spring Used L+F(mm)
12

17.9

18.7

19

23.7

24.6

26.4

30.3

31.4

31.8

35.2

36.9

37.3

38.4

41.8

43.3

44.1

45

48.4

50

51.9

55

61.6

65.5

69.3

78.8
Clear
Free Length L(mm)
10

15

20

25

30

35

40

45

50

55

60
Clear
Outer Dia. D(Ø)
3

4

5

6

8

10
Clear
Initial Tension(N)
2.16

2.55

5.1

8.6

9.81

20.59
Clear
Standard Spring Constant(N/mm)
0.98

1.37

1.57

1.67

1.71

1.77

1.86

2.06

2.16

2.45

2.65

2.94

3.24

3.43

3.53

4.31

4.61

4.9

5.39

5.69

5.88

6.57

6.77

8.34

10.89
Clear
Wire Dia.(Ø)
0.5

0.6

0.8

1

1.2

1.6
Clear
Max. Deflection(mm)
2

2.9

3.7

4

4.6

5.2

5.3

6.4

6.8

6.9

7.3

8.3

8.4

9.1

10

11.6

11.9

14.3

15.5

18.8
Clear
type
- C-AUT
- C-AWT
Clear
Allowable Load (Configurable Range)(N)
- 8.01~15.00
- 15.01~30.00
- 30.01~60.00
- 60.01~110.00
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

Same day
Clear

Specify Alterations

Tension Springs Heavy Load O.D.3-10 (Part Number)

Volume Discount

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Brand :

MiSUMi Economy

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Total Price :

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Product Description

- Tension Springs Heavy Load from MISUMI.
- This is an economy item; The price is cheaper than the MISUMI standard product.
- The wire material of spring can be selected 2 type SUS304WP-B or SWP-A.
- C－AWT and C－AUT are heavy load Tension springs type.
- The outer diameter of spring can be selected from 3.0 mm to 10.0 mm.
- The free length of spring can be selected from 10 mm to 60 mm.

Economy Tension Springs Heavy Load

High Load CapacityMaterial OptionsCustomizable Dimensions

- Max Load: Up to specified maximum. Ideal for applications requiring robust tension.

- Available in multiple material options.

- Free Length (L) and Outer Diameter (D): Available in specified ranges.

- Approximate usage life of 1 million cycles. Long-lasting performance reduces the need for frequent replacements, saving time and maintenance costs.

- Operating Temperature: -10°C to 100°C for stainless steel, 0°C to 40°C for SWP-A.

MISUMI Standard

Cheaper Price

Product Variety

3D CAD
3D CAD Support

Tension Springs Product Overview

◇ Made Tension Springs of quality materials, the Economy series tensile springs have been localized, which greatly reduces the cost, and their cost efficiency is higher thanks to Misumi’s higher quality control performance.
◇ Tension Springs, Stainless steel materials are imported from Japan, and anti-rust resistance is high. Stainless steel springs are also magnetic. Please be careful.
◇ Misumi's Economy series tensile springs have been standardized in specifications, that is, the maximum load of the same diameter is a certain value. Initial tension, and the spring coefficient is a reference value.

Tension Springs Dimensional Drawing

・L = Free length
・D ≤ Ø18mm (±1.0)
・D ≥ Ø18mm (±1.5)

Tension Springs Product Feature

Tension Springs (also known as draw spring) is a spiral spring which bears axial tension. It has side hooks at both ends to ensure the tension source of tension spring.
When not bearing load, the coils of tension spring are generally tight without clearance.
The working principle of tension spring is to act in reverse when stretching or pulling away, and to work by using the resilience (pulling force) after stretching, so as to control the movement of machine parts, absorb and store energy, measure the force and so on.

Tension Springs Specifications Overview

The initial tension and the spring constant are reference values, which are different slightly depending on batches. Load {kgf} = Load N×0.101972
Calculation method of laps (reference value):
Total number of laps = (L-2(D-d))/d
Effective laps=total number of laps-2
The number of laps is a reference value, and varies slightly depending on batches.

Tension Springs Precautions

[Tension Springs Precautions for use]
▶ Tension Springs Operating temperature
SWP-A…… Normal temperature (0 to 40℃)
Stainless steel…… -10 to 100℃
※ 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.

▶ Approximate number of times of use: about 1 million times
※ The above times are for reference only. The number of times of use varies with the tensile direction, 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..

▶Others
· Tension Springs Use within the allowable displacement Fmax.(mm). If it is used under the condition of exceeding the allowable displacement, the spring may be deformed, or damaged after using only a limited number of times. Please also be careful not to stretch the tensile spring beyond the allowable displacement when installing it.
· Stainless steel springs are also magnetic. Please be careful.

Tension Springs Example of Use

Tension Springs Example of Use
Installation Diagram

The installation diagram is for reference only.

Tension Springs Related Products

(Economy series) Tension Springs, Tensile Spring, Medium and Light Load, Medium Load, Medium and Heavy Load	(Economy series) Tension Springs, Tensile Spring, Heavy Load Double Hook	(Economy series) Tension Springs, Tensile Spring, Ultra Light Load, Light Load

Tension Springs Specification Table

■ Heavy Load Tension Springs Type

Part Number		Wire Diameter dmm	Under dynamic load		(Initial tension) N	(Spring constant) N/mm
Tension Springs Type	D-L	Wire Diameter dmm	Maximum displacement Fmax. Mm	Maximum load N	(Initial tension) N	(Spring constant) N/mm
C－AWT C－AUT	3-10	0.5	2.0	8.8	2.16	3.24
	15	0.5	3.7	8.8	2.16	1.77
	25	0.5	6.8	8.8	2.16	0.98
	4-15	0.6	4.0	11.1	2.55	2.16
	20	0.6	6.4	11.1	2.55	1.37
	5-15	0.8	2.9	20.79	5.1	5.39
	20	0.8	4.6	20.79	5.1	3.43
	25	0.8	6.4	20.79	5.1	2.45
	30	0.8	8.4	20.79	5.1	1.86
	35	0.8	10.0	20.79	5.1	1.57
	6-20	1.0	3.7	33.15	8.6	6.57
	25	1.0	5.3	33.15	8.6	4.61
	30	1.0	6.9	33.15	8.6	3.53
	35	1.0	8.3	33.15	8.6	2.94
	40	1.0	10.0	33.15	8.6	2.45
	55	1.0	14.3	33.15	8.6	1.71
	8-25	1.2	5.3	41.19	9.81	5.88
	30	1.2	7.3	41.19	9.81	4.31
	35	1.2	9.1	41.19	9.81	3.43
	40	1.2	11.9	41.19	9.81	2.65
	50	1.2	15.5	41.19	9.81	2.06
	60	1.2	18.8	41.19	9.81	1.67
	10-30	1.6	5.2	77.47	20.59	10.89
	35	1.6	6.8	77.47	20.59	8.34
	40	1.6	8.4	77.47	20.59	6.77
	45	1.6	10.0	77.47	20.59	5.69
	50	1.6	11.6	77.47	20.59	4.9

Load {kgf} = Load N × 0.101972

Part Number

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

: 30; 60; 90

Part Number
C-AUT5-15
C-AUT5-20
C-AUT5-25
C-AUT5-30
C-AUT5-35
C-AWT5-15
C-AWT5-20
C-AWT5-25
C-AWT5-30
C-AWT5-35

Price	Minimum Order Qty.	Volume Discount	Days to Ship	RoHS	Material	Allowable Load (Configurable Range) (N)	Max. Load (N)	Length of Spring Used L+F (mm)	Free Length L (mm)	Outer Dia. D (Ø)	Initial Tension (N)	Standard Spring Constant (N/mm)	Wire Dia. (Ø)	Max. Deflection (mm)
₹ 27.00	1 Piece(s)	Available	Same day	10	[Stainless Steel Wire] SUS304-WPB	15.01~30.00	20.79	17.9	15	5	5.1	5.39	0.8	2.9
₹ 46.00	1 Piece(s)	Available	Same day	10	[Stainless Steel Wire] SUS304-WPB	15.01~30.00	20.79	24.6	20	5	5.1	3.43	0.8	4.6
₹ 51.00	1 Piece(s)	Available	Same day	10	[Stainless Steel Wire] SUS304-WPB	15.01~30.00	20.79	31.4	25	5	5.1	2.45	0.8	6.4
₹ 36.00	1 Piece(s)	Available	Same day	10	[Stainless Steel Wire] SUS304-WPB	15.01~30.00	20.79	38.4	30	5	5.1	1.86	0.8	8.4
₹ 61.00	1 Piece(s)	Available	Same day	10	[Stainless Steel Wire] SUS304-WPB	15.01~30.00	20.79	45	35	5	5.1	1.57	0.8	10
₹ 53.00	1 Piece(s)	Available	Same day	10	SWP-A	15.01~30.00	20.79	17.9	15	5	5.1	5.39	0.8	2.9
₹ 56.00	1 Piece(s)	Available	Same day	10	SWP-A	15.01~30.00	20.79	24.6	20	5	5.1	3.43	0.8	4.6
₹ 65.00	1 Piece(s)	Available	Same day	10	SWP-A	15.01~30.00	20.79	31.4	25	5	5.1	2.45	0.8	6.4
₹ 56.00	1 Piece(s)	Available	Same day	10	SWP-A	15.01~30.00	20.79	38.4	30	5	5.1	1.86	0.8	8.4
₹ 66.00	1 Piece(s)	Available	Same day	10	SWP-A	15.01~30.00	20.79	45	35	5	5.1	1.57	0.8	10

Basic Information

Type	Standard Type	Hook Opposing Angle	180° (Standard)

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

Frequently asked question (FAQ)

Question: What is the initial tension?: Answer: It can be understood that when a general tensile spring is under tension, the tension measured when it is about to undergo elastic deformation without deformation (critical state) is called the initial tension. It is realized by properly controlling the process parameters in the manufacturing process of tensile spring.
MISUMI tension spring specifications (except for free designation) have been standardized, i.e. the maximum load of the same diameter is a certain value. Because the tensile spring is made on the basis of the maximum load, the initial tension and spring coefficient are the reference values.
Question: What is the life of the tensile spring?: Answer: Some hook installation methods of tension springs may cause stress concentration, so the standard use times cannot be provided. To increase the use times, it is recommended to use it under 70% of the allowable displacement Fmax.
·It is recommended to use it at room temperature below 40℃ and the load value will decrease due to service conditions at temperature over 40℃.
Question: What is the spring constant?: Answer: The spring constant is the force necessary to give the spring unit displacement, which is used to express the characteristics of the spring.
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 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

Material

Max. Load(N)

Length of Spring Used L+F(mm)

Free Length L(mm)

Outer Dia. D(Ø)

Initial Tension(N)

Standard Spring Constant(N/mm)

Wire Dia.(Ø)

Max. Deflection(mm)

type

Allowable Load (Configurable Range)(N)

CAD

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Specify Alterations

Tension Springs Heavy Load O.D.3-10 (Part Number)

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Product Description

Economy Tension Springs Heavy Load

Tension Springs Product Overview

Tension Springs Dimensional Drawing

Tension Springs Product Feature

Tension Springs Specifications Overview

Tension Springs Precautions

Tension Springs Example of Use

Tension Springs Related Products

Tension Springs Specification Table

Part Number

Basic Information

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