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Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Heavy Load【1-100 Pieces Per Package】

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Check FAQ of this product (5 items)

MISUMI

MiSUMi Economy

MISUMI

[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.

RoHS

(i)Caution

Please check the content on our website as the PDF does not contain the most up-to-date information.

Part Number

Configured Part Number is shown.

Drawing/Specifications
3D Preview
Part Numbers

Economy Round Wire Coil Springs

Heavy Load Sturdy Reliable

- Ultra Heavy Load Capacity for Demanding Applications.

- Prioritizing Outer Diameter Tolerance for Perfect Fit.

- High-Quality Stainless Steel Springs at a Lower Cost

- Ideal for high-load situations with configurable ranges.

- Optimal for extreme conditions and long-term use.

Economy Stainless Steel Knob Type Index Plunger (M8-M10 Thread)

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 outer diameter standard type, manufactured with priority to the outer diameter tolerance, and suitable for hole installation occasions.
♢Stainless steel springs are also magnetic. Please be careful.

Dimensional Drawing

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-UBB: 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	Coil O.D. D - Free Length L		Wire Dia. d	Solid Length	F max.	N{kgf} max.		Fa%
Type	Coil O.D. D - Free Length L		Wire Dia. d	Solid Length	F max.	N{kgf} max.		Fa%
C-UBB	4－	10	0.65	7.0	2.5	12.3	{1.3 }	25
		15	0.7	10.3	3.75	18.4	{1.9 }	25
		20	0.75	14.4	5	24.5	{2.5 }	25
	5－	5	0.6	2.9	1.25	6.1	{0.63}	25
		10	0.75	6.9	2.5	12.3	{1.3 }
		15	0.8	9.8	3.75	18.4	{1.9 }
		20	0.85	13.4	5.0	24.5	{2.5 }	25
		25	0.9	17.8	6.25	30.6	{3.12 }	25
	6－	10	0.9	6.8	2.5	24.5	{2.5 }	25
		15	1.0	10.5	3.75	36.8	{3.8 }
		20	1.1	14.6	5.0	49.0	{5.0 }
		25	1.1	17.9	6.25	61.3	{6.26 }	25
	8－	10	1.1	6.9	2.5	24.5	{2.5 }	25
		15	1.2	9.9	3.75	36.8	{3.8 }
		20	1.3	14.0	5.0	49.0	{5.0 }
		25	1.3	14.5	6.25	61.3	{6.3 }
	10－	10	1.3	7.2	2.5	24.5	{2.5 }	25
		15	1.4	10.2	3.75	36.8	{3.8 }	25
		20	1.5	13.9	5.0	49.0	{5.0 }
		25	1.5	16.1	6.25	61.3	{6.3 }
		30	1.6	20.4	7.5	73.5	{7.5 }	25
	12－	15	1.5	9.4	3.75	36.8	{3.8 }	25
		20	1.6	12.4	5.0	49.0	{5.0 }
		30	1.8	20.3	7.5	73.5	{7.5 }
	13－	15	1.8	9.5	3.75	73.5	{7.5 }	25
		20	1.9	12.9	5.0	98.1	{10.01}	25
		25	2.0	17.0	6.25	123	{12.55}	25
		30	2.1	20.5	7.5	147	{15.0}	25
		40	2.3	28.2	10.0	196.0	{20.0}	25
		60	2.5	44.4	12	235	{24.0}	20
	16－	20	2.1	12.1	5.0	98.1	{10.01}	25
		30	2.4	21.0	7.5	147.0	{15.0}	25
	20－	25	2.9	16.7	6.25	184.0	{18.8}	25
		40	3.2	27.2	10	294	{30.0}	25
		60	3.5	44.6	12.0	353.0	{36.02}	25

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

The solid length is a reference value. There will be slight differences among batches.

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

The number of laps is a reference value. There will be slight differences among batches.

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

■Spring Constant

D12 is for C-UY・C-UR・C-UF・C-UBB only. D14 is for C-UBB only.

Type

C-UV

C-UY

C-UR

C-UF

C-UL

C-UTT

C-UM

C-UH

C-UBB

0.05{0.005}

0.2{0.02}

0.3{0.03}

0.5{0.05}

N/mm
0.05
{kgf/mm}{0.005}

N/mm
0.098
{kgf/mm}{0.01}

N/mm
0.29
{kgf/mm}
{0.03}

N/mm
0.49
{kgf/mm}
{0.05}

N/mm
0.98
{kgf/mm}
{0.1}

1.5{0.15}

2.0
{0.2}

2.9{0.3}

4.9{0.5}

N/mm
2.0
{kgf/mm}
{0.2}

N/mm
2.9
{kgf/mm}
{0.3}

N/mm
5.9
{kgf/mm}
{0.6}

N/mm
9.8
{kgf/mm}
{1.0}

N/mm
0.2
{kgf/mm}
{0.02}

N/mm
9.8
{kgf/mm}
{1.0}

N/mm
19.6
{kgf/mm}
{2.0}

0.3{0.03}

0.5{0.05}

0.98{0.1}

2.9{0.3}

3.9{0.4}

4.9{0.5}

14.7{1.5}

29.4{3.0}

Fmax.

F＝L×70％

F＝L×75％

F＝L×60％

F＝L×45％

F＝L×40％

F＝L×35％

F＝L×30％

F＝L×25％

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 giving priority 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 displacement Fmax.(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

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.

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.

Part Number

CAD Data download and 3D preview are not available because the part number has not yet been determined.

*In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.

CAD Download

: 30; 45; 60

Part Number
C-UBB4-5
C-UBB4-5-PACK
C-UBB4-10
C-UBB4-10-PACK
C-UBB4-15
C-UBB4-15-PACK
C-UBB4-20
C-UBB4-20-PACK
C-UBB5-5
C-UBB5-5-PACK
C-UBB5-10
C-UBB5-10-PACK
C-UBB5-15
C-UBB5-15-PACK
C-UBB5-20
C-UBB5-20-PACK
C-UBB5-25
C-UBB5-25-PACK
C-UBB5-30
C-UBB5-30-PACK
C-UBB6-5-PACK
C-UBB6-10
C-UBB6-10-PACK
C-UBB6-15
C-UBB6-15-PACK
C-UBB6-20
C-UBB6-20-PACK
C-UBB6-25
C-UBB6-25-PACK
C-UBB8-10
C-UBB8-10-PACK
C-UBB8-15
C-UBB8-15-PACK
C-UBB8-20
C-UBB8-20-PACK
C-UBB8-25
C-UBB8-25-PACK
C-UBB8-40
C-UBB8-40-PACK
C-UBB10-10
C-UBB10-10-PACK
C-UBB10-15
C-UBB10-15-PACK
C-UBB10-20
C-UBB10-20-PACK
C-UBB10-25
C-UBB10-25-PACK
C-UBB10-30
C-UBB10-30-PACK
C-UBB10-60-PACK
C-UBB12-15
C-UBB12-15-PACK
C-UBB12-20
C-UBB12-20-PACK
C-UBB12-30
C-UBB12-30-PACK
C-UBB13-15
C-UBB13-15-PACK
C-UBB13-20
C-UBB13-20-PACK

Standard Unit Price	Number of pc(s). included in pkg.	Minimum order quantity	Volume Discount	Days to Ship	Free Length L (mm)	Inner Dia. D-2d (or D) (Ø)	Outer Dia. D (or D1) (Ø)	Spring Constant (N/mm)	Allowable Load (Configurable Range) (N)	Material	Wire Dia. (Ø)	Height H2 at Allowable Load (mm)	Allowable Load P2 (N)	End Face Condition	Total Number of Turns N	Solid Length (mm)	Allowable Displacement (mm)	Sales Package
MYR 1.52		100 Piece(s)	Available	11 Day(s)	5	2.9	4	4.9	-	SUS304-WPB	0.55	3.75	6.1	Non-grinding Processing	5	3.3	1.25	Single Item
MYR 80.34	100 Pieces Per Package	1 Pack(s)		11 Day(s)	5	-	4	-	-	-	-	-	-	-	-	-	-	-
MYR 1.74		1 Piece(s)	Available	1 Day(s)	10	2.7	4	4.9	8.51~16.00	SUS304-WPB	0.65	7.5	12.3	Grinding Processing	9.8	7	2.5	Single Item
MYR 116.29	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	10	-	4	-	-	-	-	-	-	-	-	-	-	-
MYR 1.93		1 Piece(s)	Available	1 Day(s)	15	2.6	4	4.9	16.01~30.00	SUS304-WPB	0.7	11.25	18.4	Grinding Processing	13.7	10.3	3.75	Single Item
MYR 127.72	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	4	-	-	-	-	-	-	-	-	-	-	-
MYR 1.28		100 Piece(s)	Available	10 Day(s)	20	2.5	4	4.9	-	SUS304-WPB	0.75	15	24.5	Grinding Processing	18.2	14.4	5	Single Item
MYR 119.36	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	20	-	4	-	-	-	-	-	-	-	-	-	-	-
MYR 1.74		1 Piece(s)	Available	1 Day(s)	5	3.8	5	4.9	4.51~8.50	SUS304-WPB	0.6	3.75	6.1	Grinding Processing	3.8	2.9	1.25	Single Item
MYR 105.20	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	5	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 1.27		1 Piece(s)	Available	1 Day(s)	10	3.5	5	4.9	8.51~16.00	SUS304-WPB	0.75	7.5	12.3	Grinding Processing	8.2	6.9	2.5	Single Item
MYR 106.43	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	10	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 1.93		1 Piece(s)	Available	1 Day(s)	15	3.4	5	4.9	16.01~30.00	SUS304-WPB	0.8	11.25	18.4	Grinding Processing	11.3	9.8	3.75	Single Item
MYR 123.87	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 1.36		100 Piece(s)	Available	10 Day(s)	20	3.3	5	4.9	-	SUS304-WPB	0.85	15	24.5	Grinding Processing	14.8	13.4	5	Single Item
MYR 126.09	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	20	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 1.48		100 Piece(s)	Available	10 Day(s)	25	3.2	5	4.9	-	SUS304-WPB	0.9	18.75	30.6	Grinding Processing	18.8	17.8	6.25	Single Item
MYR 136.50	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	25	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 2.40		100 Piece(s)	Available	11 Day(s)	30	3.2	5	4.9	-	SUS304-WPB	0.9	22.5	36.8	Grinding Processing	23.2	21.8	7.5	Single Item
MYR 145.12	100 Pieces Per Package	1 Pack(s)		11 Day(s)	30	-	5	-	-	-	-	-	-	-	-	-	-	-
MYR 99.90	100 Pieces Per Package	1 Pack(s)	Available	13 Day(s)	5	4.4	6	9.8	-	SUS304-WPB	0.8	3.75	12.3	Grinding Processing	3.5	3.6	1.25	Package
MYR 1.04		1 Piece(s)	Available	1 Day(s)	10	4.2	6	9.8	16.01~30.00	SUS304-WPB	0.9	7.5	24.5	Grinding Processing	6.6	6.8	2.5	Single Item
MYR 103.78	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	10	-	6	-	-	-	-	-	-	-	-	-	-	-
MYR 1.83		1 Piece(s)	Available	1 Day(s)	15	4	6	9.8	30.01~50.00	SUS304-WPB	1	11.25	36.8	Grinding Processing	9.5	10.5	3.75	Single Item
MYR 116.38	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	6	-	-	-	-	-	-	-	-	-	-	-
MYR 1.97		1 Piece(s)	Available	1 Day(s)	20	3.8	6	9.8	30.01~50.00	SUS304-WPB	1.1	15	49.0	Grinding Processing	12.3	14.6	5	Single Item
MYR 132.69	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	20	-	6	-	-	-	-	-	-	-	-	-	-	-
MYR 1.58		100 Piece(s)	Available	10 Day(s)	25	3.8	6	9.8	-	SUS304-WPB	1.1	18.75	61.3	Grinding Processing	15.3	17.9	6.25	Single Item
MYR 144.96	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	25	-	6	-	-	-	-	-	-	-	-	-	-	-
MYR 1.95		1 Piece(s)	Available	5 Day(s)	10	5.8	8	9.8	16.01~30.00	SUS304-WPB	1.1	7.5	24.5	Grinding Processing	5.3	6.9	2.5	Single Item
MYR 121.58	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	10	-	8	-	-	-	-	-	-	-	-	-	-	-
MYR 1.39		1 Piece(s)	Available	1 Day(s)	15	5.6	8	9.8	30.01~50.00	SUS304-WPB	1.2	11.25	36.8	Grinding Processing	7.3	9.9	3.75	Single Item
MYR 121.21	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	8	-	-	-	-	-	-	-	-	-	-	-
MYR 1.48		1 Piece(s)	Available	1 Day(s)	20	5.4	8	9.8	30.01~50.00	SUS304-WPB	1.3	15	49.0	Grinding Processing	9.8	14	5	Single Item
MYR 127.20	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	20	-	8	-	-	-	-	-	-	-	-	-	-	-
MYR 1.95		1 Piece(s)	Available	1 Day(s)	25	5.4	8	9.8	50.01~73.00	SUS304-WPB	1.3	18.75	61.3	Grinding Processing	10.2	14.5	6.25	Single Item
MYR 149.90	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	25	-	8	-	-	-	-	-	-	-	-	-	-	-
MYR 3.46		100 Piece(s)	Available	11 Day(s)	40	5	8	9.8	-	SUS304-WPB	1.5	30	98.1	Grinding Processing	18.3	28.9	10	Single Item
MYR 197.94	100 Pieces Per Package	1 Pack(s)		11 Day(s)	40	-	8	-	-	-	-	-	-	-	-	-	-	-
MYR 1.42		100 Piece(s)	Available	10 Day(s)	10	7.4	10	9.8	-	SUS304-WPB	1.3	7.5	24.5	Grinding Processing	4.5	7.2	2.5	Single Item
MYR 132.23	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	10	-	10	-	-	-	-	-	-	-	-	-	-	-
MYR 2.11		1 Piece(s)	Available	1 Day(s)	15	7.2	10	9.8	30.01~50.00	SUS304-WPB	1.4	11.25	36.8	Grinding Processing	6.3	10.2	3.75	Single Item
MYR 154.30	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	10	-	-	-	-	-	-	-	-	-	-	-
MYR 1.80		1 Piece(s)	Available	1 Day(s)	20	7	10	9.8	30.01~50.00	SUS304-WPB	1.5	15	49.0	Grinding Processing	8.3	13.9	5	Single Item
MYR 169.34	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	20	-	10	-	-	-	-	-	-	-	-	-	-	-
MYR 1.93		1 Piece(s)	Available	1 Day(s)	25	7	10	9.8	50.01~73.00	SUS304-WPB	1.5	18.75	61.3	Grinding Processing	9.7	16.1	6.25	Single Item
MYR 183.58	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	25	-	10	-	-	-	-	-	-	-	-	-	-	-
MYR 2.14		100 Piece(s)	Available	10 Day(s)	30	6.8	10	9.8	-	SUS304-WPB	1.6	22.5	73.5	Grinding Processing	11.8	20.4	7.5	Single Item
MYR 194.30	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	30	-	10	-	-	-	-	-	-	-	-	-	-	-
MYR 299.81	100 Pieces Per Package	1 Pack(s)	Available	13 Day(s)	60	6.4	10	9.8	-	SUS304-WPB	1.8	45	147	Grinding Processing	22	41.4	15	Package
MYR 2.26		1 Piece(s)	Available	1 Day(s)	15	9	12	9.8	30.01~50.00	SUS304-WPB	1.5	11.25	36.8	Grinding Processing	5.3	9.4	3.75	Single Item
MYR 151.74	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	12	-	-	-	-	-	-	-	-	-	-	-
MYR 2.57		1 Piece(s)	Available	1 Day(s)	20	8.8	12	9.8	30.01~50.00	SUS304-WPB	1.6	15	49.0	Grinding Processing	6.8	12.4	5	Single Item
MYR 194.83	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	20	-	12	-	-	-	-	-	-	-	-	-	-	-
MYR 3.06		1 Piece(s)	Available	1 Day(s)	30	8.4	12	9.8	73.01~107.00	SUS304-WPB	1.8	22.5	73.5	Grinding Processing	10.3	20.3	7.5	Single Item
MYR 232.30	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	30	-	12	-	-	-	-	-	-	-	-	-	-	-
MYR 2.44		1 Piece(s)	Available	1 Day(s)	15	9.4	13	19.6	73.01~107.00	SUS304-WPB	1.8	11.25	73.5	Grinding Processing	4.3	9.5	3.75	Single Item
MYR 183.78	100 Pieces Per Package	1 Pack(s)	Available	6 Day(s)	15	-	13	-	-	-	-	-	-	-	-	-	-	-
MYR 2.14		100 Piece(s)	Available	10 Day(s)	20	9.2	13	19.6	-	SUS304-WPB	1.9	15	98.1	Grinding Processing	5.8	12.9	5	Single Item
MYR 192.07	100 Pieces Per Package	1 Pack(s)	Available	11 Day(s)	20	-	13	-	-	-	-	-	-	-	-	-	-	-

Configure

80 Part Numbers

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Configure Remaining Specifications

Completed

Specification/Dimensions

Free Length L(mm)
5

10

15

20

25

30

40

60
Clear
Inner Dia. D-2d (or D)(Ø)
2.5

2.6

2.7

2.9

3.2

3.3

3.4

3.5

3.8

4

4.2

4.4

5

5.4

5.6

5.8

6.4

6.8

7

7.2

7.4

8

8.4

8.8

9

9.2

9.4

11.2

11.4

11.8

13

13.6

14.2
Clear
Outer Dia. D (or D1)(Ø)
4

5

6

8

10

12

13

16

20
Clear
Spring Constant(N/mm)
4.9

9.8

19.6

29.4
Clear
Allowable Load (Configurable Range)(N)
- 4.51~8.50
- 8.51~16.00
- 16.01~30.00
- 30.01~50.00
- 50.01~73.00
- 73.01~107.00
- 107.01~150.00
- 150.01~230.00
- 230.01~580.00
Clear
Material
- SUS304-WPB
Clear
Wire Dia.(Ø)
0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

1

1.1

1.2

1.3

1.4

1.5

1.6

1.8

1.9

2

2.1

2.3

2.4

2.5

2.9

3.2

3.5
Clear
Sales Package
- Package
- Single Item
Clear
type
- C-UBB
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

1 Day(s) or Less

5 Day(s) or Less

6 Day(s) or Less

10 Day(s) or Less

11 Day(s) or Less

13 Day(s) or Less
Clear

Specify Alterations

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 intermediate shaft of the inner diameter side guide rail by 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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(Economy series) Round Wire Springs - Outer Diameter Standard Stainless Steel, Light Load, Spring Constant 0.5 to 3.9 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, 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

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Round Wire Coil Springs, Defection O.D. Referenced, Stainless Steel, Ultra Heavy Load【1-100 Pieces Per Package】

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Economy Round Wire Coil Springs

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Specification/Dimensions

Free Length L(mm)

Inner Dia. D-2d (or D)(Ø)

Outer Dia. D (or D1)(Ø)

Spring Constant(N/mm)

Allowable Load (Configurable Range)(N)

Material

Wire Dia.(Ø)

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type

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Specify Alterations

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