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Tension Springs/Configurable Length (Part Numbers)

MISUMI

Outer diameter size (Φ7, Φ11, Φ13, Φ15, Φ17) standard added!
A tension spring whose free length can be specified in units of 1 mm.
The outer diameter and length can be freely specified according to the intended use.
Piano wire is also based on the outer diameter.

(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.

Type	Material
WFSP	SWP-A
UFSP	SUS304-WPB

Type	Material
BWFSP	SWP-A
BUFSP	SUS304-WPB

Specifications

Part Number	-	d	-	S
WFSP3 UFSP20	- -	0.3 2.6	- -	10 498

[ ! ]Maximum deflection factor is a numerical value for static loads.
When applying a dynamic load, use the maximum deflection factor × 0.65.
[ ! ]For the maximum deflection, the Web specifications show a percentage, and the catalog PDF shows the value when the S dimension is 50.
Both values give the same result when used.
[ ! ]For the standard spring constant, the Web specifications show a value where the S dimension is 10, and the catalog PDF shows the value when the S dimension is 50.

Part Number		Wire Dia. d mm	S 1mm Increment	Maximum deflection factor (S) ％		Standard Spring Constant (When S = 10) N/mm		Initial Tension N


Type	D			WFSP	UFSP	WFSP	UFSP	WFSP	UFSP
Type	D			BWFSP	BUFSP	BWFSP	BUFSP	BWFSP	BUFSP
WFSP UFSP BWFSP BUFSP	3	0.3	10〜300	176%	174%	0.13	0.11	0.18	0.21
	3	0.4		82%	84%	0.60	0.50	0.53	0.64
	4	0.4		172%	174%	0.20	0.20	0.31	0.38
	4	0.5		96%	92%	0.75	0.65	0.77	0.92
	5	0.5	10〜500	168%	164%	0.35	0.30	0.49	0.59
	5	0.6		100%	102%	0.90	0.80	1.01	1.21
	6	0.6		158%	164%	0.50	0.45	0.71	0.85
	6	0.8		72%	72%	2.35	2.05	2.13	2.55
	7	0.7		140%	132%	0.65	0.60	0.96	1.15
	7	0.9		70%	64%	2.60	2.25	2.94	3.5
	8	0.8		148%	152%	0.90	0.80	1.26	1.51
	8	1		82%	84%	2.90	2.55	3.04	4.26
	9	1	10〜550	112%	114%	1.95	1.70	2.45	3.43
	9	1.2		66%	66%	5.25	4.65	4.41	6.17
	10	1		148%	140%	1.35	1.20	1.96	2.74
		1.2		88%	86%	3.65	3.25	4.31	6.03
		1.4		58%	56%	8.50	7.50	7.64	10.7
	11	1		160%	152%	1.00	0.85	1.45	2.01
		1.2		92%	90%	2.65	2.35	3.24	4.51
		1.4		62%	60%	6.20	5.40	6.39	8.87
	12	1		232%	226%	0.75	0.65	1.18	1.65
		1.2		142%	140%	1.95	1.75	2.84	3.98
		1.4		92%	92%	4.55	4.00	5.39	7.55
		1.6		62%	60%	9.40	8.30	8.72	12.21
	13	1		240%	234%	0.55	0.50	0.93	1.29
		1.2		144%	142%	1.55	1.35	2.17	3.01
		1.4		94%	94%	3.50	3.05	3.95	5.49
		1.6		64%	62%	7.10	6.20	7.75	10.76
	14	1.2		208%	192%	1.20	1.05	2.06	2.88
		1.4		138%	130%	2.70	2.40	3.82	5.35
		1.6		94%	90%	5.55	4.90	6.66	9.32
		1.8		68%	66%	10.50	9.30	10.6	14.84
	15	1.2		212%	196%	0.95	0.85	1.5	2.09
		1.4		140%	132%	2.15	1.90	3.03	4.21
		1.6		96%	92%	4.40	3.80	4.74	6.59
		1.8		70%	68%	8.45	7.35	9.25	12.85
	16	1.4		192%	182%	1.75	1.55	3.04	4.26
		1.6		132%	130%	3.55	3.15	5.1	7.14
		1.8		96%	94%	6.65	5.90	8.33	11.66
		2		68%	70%	11.85	10.50	12.6	17.64
	17	1.4		194%	184%	1.45	1.25	2.21	3.08
		1.6		134%	132%	2.90	2.50	4.03	5.6
		1.8		98%	96%	5.55	4.85	6.74	9.37
		2		70%	72%	9.90	8.65	10.9	15.13
	18	1.6		176%	174%	2.40	2.10	4.02	5.63
		1.8		128%	128%	4.50	4.00	6.47	9.06
		2		94%	96%	7.95	7.00	10	14
		2.3		62%	60%	17.00	15.05	18.7	26.18
	20	1.8		168%	156%	3.15	2.80	5.1	7.14
		2		122%	120%	5.55	4.95	7.94	11.12
		2.3		82%	80%	11.85	10.50	15.2	21.28
		2.6		58%	58%	23.20	20.50	23.6	33.04
	22	2		150%	148%	4.05	3.60	7.35	10.3
		2.3		106%	104%	8.60	7.60	11.8	16.5
		2.6		74%	74%	16.75	14.80	19.6	27.4
		2.9		54%	54%	30.45	26.95	33.3	46.6
	25	2.3		144%	144%	5.60	4.95	9.8	13.7
		2.6		100%	104%	10.85	9.60	15.7	22
		2.9		76%	72%	19.65	17.40	22.5	31.5
		3.2		56%	54%	33.75	29.85	34.3	48
	28	2.6		138%	128%	7.45	6.60	12.7	17.8
		2.9		102%	98%	13.45	11.90	17.6	24.6
		3.2		78%	74%	22.90	20.25	27.4	38.4
		3.5		62%	58%	37.45	33.10	39.2	54.9

■Accuracy Standards
• D Dimension Tolerance

D/d^*1	Tolerance
Less than 8	±1.5% of D dimension (Min. ±0.2mm)
8~20	±2% of D dimension (Min. ±0.3mm)

*1. D/d = Spring Index
• S Dimension Tolerance
When d≤0.5, ±2 x Wire Dia.
(Ex: When d=0.3, ±0.6)
When d≥0.6, ±Wire Dia.
(Ex: When d=1.0, ±1.0)

• Calculate the maximum deflection and spring constant using the following formula.
• Maximum deflection Maximum deflection (mm) = S × maximum deflection factor (%)	• Spring constant(reference value) Spring constant (N/mm) ＝ reference spring constant × 10/S

Example) Calculation of maximum deflection and spring constant of UFSP20-2.6-498

Maximum deflection(mm) = 498×58% = 288.84	Spring constant(N/mm) = 20.50 ×	10	= 0.41
		498

[ ! ]For the maximum deflection, the Web specifications show a percentage, and the catalog PDF shows the value when the S dimension is 50.
Both values give the same result when used.
[ ! ]For the standard spring constant, the Web specifications show a value where the S dimension is 10, and the catalog PDF shows the value when the S dimension is 50.

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; 60; 90

Part Number
UFSP22-2.0-[10-550/1]
UFSP22-2.3-[10-550/1]
UFSP22-2.6-[10-550/1]
UFSP22-2.9-[10-550/1]
UFSP25-2.3-[10-550/1]
UFSP25-2.6-[10-550/1]
UFSP25-2.9-[10-550/1]
UFSP25-3.2-[10-550/1]
UFSP28-2.6-[10-550/1]
UFSP28-2.9-[10-550/1]
UFSP28-3.2-[10-550/1]
UFSP28-3.5-[10-550/1]
WFSP3-0.3-[10-300/1]
WFSP3-0.4-[10-300/1]
WFSP4-0.4-[10-300/1]
WFSP4-0.5-[10-300/1]
WFSP5-0.5-[10-500/1]
WFSP5-0.6-[10-500/1]
WFSP6-0.6-[10-500/1]
WFSP6-0.8-[10-500/1]
WFSP7-0.7-[10-500/1]
WFSP7-0.9-[10-500/1]
WFSP8-0.8-[10-500/1]
WFSP8-1.0-[10-500/1]
WFSP9-1.0-[10-550/1]
WFSP9-1.2-[10-550/1]
WFSP10-1.0-[10-550/1]
WFSP10-1.2-[10-550/1]
WFSP10-1.4-[10-550/1]
WFSP11-1.0-[10-550/1]
WFSP11-1.2-[10-550/1]
WFSP11-1.4-[10-550/1]
WFSP12-1.0-[10-550/1]
WFSP12-1.2-[10-550/1]
WFSP12-1.4-[10-550/1]
WFSP12-1.6-[10-550/1]
WFSP13-1.0-[10-550/1]
WFSP13-1.2-[10-550/1]
WFSP13-1.4-[10-550/1]
WFSP13-1.6-[10-550/1]
WFSP14-1.2-[10-550/1]
WFSP14-1.4-[10-550/1]
WFSP14-1.6-[10-550/1]
WFSP14-1.8-[10-550/1]
WFSP15-1.2-[10-550/1]
WFSP15-1.4-[10-550/1]
WFSP15-1.6-[10-550/1]
WFSP15-1.8-[10-550/1]
WFSP16-1.4-[10-550/1]
WFSP16-1.6-[10-550/1]
WFSP16-1.8-[10-550/1]
WFSP16-2.0-[10-550/1]
WFSP17-1.4-[10-550/1]
WFSP17-1.6-[10-550/1]
WFSP17-1.8-[10-550/1]
WFSP17-2.0-[10-550/1]
WFSP18-1.6-[10-550/1]
WFSP18-1.8-[10-550/1]
WFSP18-2.0-[10-550/1]
WFSP18-2.3-[10-550/1]
WFSP20-1.8-[10-550/1]
WFSP20-2.0-[10-550/1]
WFSP20-2.3-[10-550/1]
WFSP20-2.6-[10-550/1]
WFSP22-2.0-[10-550/1]
WFSP22-2.3-[10-550/1]
WFSP22-2.6-[10-550/1]
WFSP22-2.9-[10-550/1]
WFSP25-2.3-[10-550/1]
WFSP25-2.6-[10-550/1]
WFSP25-2.9-[10-550/1]
WFSP25-3.2-[10-550/1]
WFSP28-2.6-[10-550/1]
WFSP28-2.9-[10-550/1]
WFSP28-3.2-[10-550/1]
WFSP28-3.5-[10-550/1]

Standard Unit Price	Minimum order quantity	Days to Ship	RoHS	Material	Hook Opposing Angle	Outer Dia. D (Ø)	Initial Tension (N)	Standard Spring Constant (N/mm)	Wire Dia. (Ø)	S (mm)
-	1 Piece(s)	6 Day(s) or more	10	-	-	22	10.3	3.6	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	22	16.5	7.6	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	22	27.4	14.8	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	22	46.6	26.95	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	25	13.70	4.95	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	25	22.00	9.6	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	25	31.50	17.4	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	25	48.00	29.85	3.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	28	17.80	6.6	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	28	24.6	11.9	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	28	38.40	20.25	3.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	-	-	28	54.90	33.1	3.5	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	3	0.18	0.13	0.3	10 ～ 300
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	3	0.53	0.6	0.4	10 ～ 300
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	4	0.31	0.2	0.4	10 ～ 300
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	4	0.77	0.75	0.5	10 ～ 300
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	5	0.49	0.35	0.5	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	5	1.01	0.9	0.6	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	6	0.71	0.5	0.6	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	6	2.13	2.35	0.8	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	7	0.96	0.65	0.7	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	7	2.94	2.6	0.9	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	8	1.26	0.9	0.8	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	8	3.04	2.9	1	10 ～ 500
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	9	2.45	1.95	1	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	9	4.41	5.25	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	10	1.96	1.35	1	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	10	4.31	3.65	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	10	7.64	8.5	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	11	1.45	1	1	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	11	3.24	2.65	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	11	6.39	6.2	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	12	1.18	0.75	1	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	12	2.84	1.95	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	12	5.39	4.55	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	12	8.72	9.4	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	13	0.93	0.55	1	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	13	2.17	1.55	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	13	3.95	3.5	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	13	7.75	7.1	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	14	2.06	1.2	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	14	3.82	2.7	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	14	6.66	5.55	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	14	10.6	10.5	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	15	1.50	0.95	1.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	15	3.03	2.15	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	15	4.74	4.4	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	15	9.25	8.45	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	16	3.04	1.75	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	16	5.1	3.55	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	16	8.33	6.65	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	16	12.6	11.85	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	17	2.21	1.45	1.4	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	17	4.03	2.9	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	17	6.74	5.55	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	17	10.90	9.9	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	18	4.02	2.4	1.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	18	6.47	4.5	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	18	10.00	7.95	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	18	18.7	17	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	20	5.1	3.15	1.8	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	20	7.94	5.55	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	20	15.20	11.85	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	20	23.60	23.2	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	22	7.35	4.05	2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	22	11.8	8.6	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	22	19.60	16.75	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	22	33.3	30.45	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	25	9.80	5.6	2.3	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	25	15.7	10.85	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	25	22.50	19.65	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	25	34.3	33.75	3.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	28	12.70	7.45	2.6	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	28	17.60	13.45	2.9	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	28	27.4	22.9	3.2	10 ～ 550
-	1 Piece(s)	6 Day(s) or more	10	SWP-A	-	28	39.20	37.45	3.5	10 ～ 550

Basic Information

Type	Standard Type

Configure

256 Part Numbers

View Part Numbers

Configure Remaining Specifications

Completed

Specification/Dimensions

Material
- SWP-A
Clear
Hook Opposing Angle
- 90°
Clear
Outer Dia. D(Ø)
3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

20

22

25

28
Clear
Initial Tension(N)
0.18

0.21

0.31

0.38

0.49

0.53

0.59

0.64

0.71

0.77

0.85

0.92

0.93

0.96

1.01

1.15

1.18

1.21

1.26

1.29

1.45

1.50

1.51

1.65

1.96

2.01

2.06

2.09

2.13

2.17

2.21

2.45

2.55

2.74

2.84

2.88

2.94

3.01

3.03

3.04

3.08

3.24

3.43

3.50

3.82

3.95

3.98

4.02

4.03

4.21

4.26

4.31

4.41

4.51

4.74

5.1

5.35

5.39

5.49

5.60

5.63

6.03

6.17

6.39

6.47

6.59

6.66

6.74

7.14

7.35

7.55

7.64

7.75

7.94

8.33

8.72

8.87

9.06

9.25

9.32

9.37

9.80

10.00

10.3

10.6

10.70

10.76

10.90

11.12

11.66

11.8

12.21

12.6

12.70

12.85

13.70

14

14.84

15.13

15.20

15.7

16.5

17.60

17.64

17.80

18.7

19.60

21.28

22.00

22.50

23.60

24.6

26.18

27.4

31.50

33.04

33.3

34.3

38.40

39.20

46.6

48.00

54.90
Clear
Standard Spring Constant(N/mm)
0.11

0.13

0.2

0.3

0.35

0.45

0.5

0.55

0.6

0.65

0.75

0.8

0.85

0.9

0.95

1

1.05

1.2

1.25

1.35

1.45

1.55

1.7

1.75

1.9

1.95

2.05

2.1

2.15

2.25

2.35

2.4

2.5

2.55

2.6

2.65

2.7

2.8

2.9

3.05

3.15

3.25

3.5

3.55

3.6

3.65

3.8

4

4.05

4.4

4.5

4.55

4.65

4.85

4.9

4.95

5.25

5.4

5.55

5.6

5.9

6.2

6.6

6.65

7

7.1

7.35

7.45

7.5

7.6

7.95

8.3

8.45

8.5

8.6

8.65

9.3

9.4

9.6

9.9

10.5

10.85

11.85

11.9

13.45

14.8

15.05

16.75

17

17.4

19.65

20.25

20.5

22.9

23.2

26.95

29.85

30.45

33.1

33.75

37.45
Clear
Wire Dia.(Ø)
0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

1.2

1.4

1.6

1.8

2

2.3

2.6

2.9

3.2

3.5
Clear
S(mm)
[10-550/1mm Unit(s)]
Clear
type
- BUFSP
- BWFSP
- UFSP
- WFSP
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

6 Day(s) or Less
Clear

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

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