Tension Springs / Configurable Length

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Tension Springs/Configurable Length:Related Image

Type	Material
WFSP	JIS-SWP-A
UFSP	EN 1.4301 (WPB) Equiv.

Type	Material
BWFSP	JIS-SWP-A
BUFSP	EN 1.4301 (WPB) Equiv.

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
8 or Less	±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, ±2x 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.

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Part Number
BWFSP3-0.3-[10-300/1]
BWFSP3-0.4-[10-300/1]
BWFSP4-0.4-[10-300/1]
BWFSP4-0.5-[10-300/1]
BWFSP5-0.5-[10-500/1]
BWFSP5-0.6-[10-500/1]
BWFSP6-0.6-[10-500/1]
BWFSP6-0.8-[10-500/1]
BWFSP7-0.7-[10-550/1]
BWFSP7-0.9-[10-550/1]
BWFSP8-0.8-[10-500/1]
BWFSP8-1.0-[10-500/1]
BWFSP9-1.0-[10-550/1]
BWFSP9-1.2-[10-550/1]
BWFSP10-1.0-[10-550/1]
BWFSP10-1.2-[10-550/1]
BWFSP10-1.4-[10-550/1]
BWFSP11-1.0-[10-550/1]
BWFSP11-1.2-[10-550/1]
BWFSP11-1.4-[10-550/1]
BWFSP12-1.0-[10-550/1]
BWFSP12-1.2-[10-550/1]
BWFSP12-1.4-[10-550/1]
BWFSP12-1.6-[10-550/1]
BWFSP13-1.0-[10-550/1]
BWFSP13-1.2-[10-550/1]
BWFSP13-1.4-[10-550/1]
BWFSP13-1.6-[10-550/1]
BWFSP14-1.2-[10-550/1]
BWFSP14-1.4-[10-550/1]
BWFSP14-1.6-[10-550/1]
BWFSP14-1.8-[10-550/1]
BWFSP15-1.2-[10-550/1]
BWFSP15-1.4-[10-550/1]
BWFSP15-1.6-[10-550/1]
BWFSP15-1.8-[10-550/1]
BWFSP16-1.4-[10-550/1]
BWFSP16-1.6-[10-550/1]
BWFSP16-1.8-[10-550/1]
BWFSP16-2.0-[10-550/1]
BWFSP17-1.4-[10-550/1]
BWFSP17-1.6-[10-550/1]
BWFSP17-1.8-[10-550/1]
BWFSP17-2.0-[10-550/1]
BWFSP18-1.6-[10-550/1]
BWFSP18-1.8-[10-550/1]
BWFSP18-2.0-[10-550/1]
BWFSP18-2.3-[10-550/1]
BWFSP20-1.8-[10-550/1]
BWFSP20-2.0-[10-550/1]
BWFSP20-2.3-[10-550/1]
BWFSP20-2.6-[10-550/1]
BWFSP22-2.0-[10-550/1]
BWFSP22-2.3-[10-550/1]
BWFSP22-2.6-[10-550/1]
BWFSP22-2.9-[10-550/1]
BWFSP25-2.3-[10-550/1]
BWFSP25-2.6-[10-550/1]
BWFSP25-2.9-[10-550/1]
BWFSP25-3.2-[10-550/1]

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	RoHS	Material	Hook Opposing Angle	O.D. D (mm)	Initial Tension (N)	Reference Spring Constant (N/mm)	Wire Dia. (mm)	S (mm)
-	1	7 Days	10	JIS-SWP-A	90°	3	0.18	0.13	0.3	10 ～ 300
-	1	7 Days	10	JIS-SWP-A	90°	3	0.53	0.6	0.4	10 ～ 300
-	1	7 Days	10	JIS-SWP-A	90°	4	0.31	0.2	0.4	10 ～ 300
-	1	7 Days	10	JIS-SWP-A	90°	4	0.77	0.75	0.5	10 ～ 300
-	1	7 Days	10	JIS-SWP-A	90°	5	0.49	0.35	0.5	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	5	1.01	0.9	0.6	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	6	0.71	0.5	0.6	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	6	2.13	2.35	0.8	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	7	0.96	0.65	0.7	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	7	2.94	2.6	0.9	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	8	1.26	0.9	0.8	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	8	3.04	2.9	1	10 ～ 500
-	1	7 Days	10	JIS-SWP-A	90°	9	2.45	1.95	1	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	9	4.41	5.25	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	10	1.96	1.35	1	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	10	4.31	3.65	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	10	7.64	8.5	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	11	1.45	1	1	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	11	3.24	2.65	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	11	6.39	6.2	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	12	1.18	0.75	1	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	12	2.84	1.95	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	12	5.39	4.55	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	12	8.72	9.4	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	13	0.93	0.55	1	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	13	2.17	1.55	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	13	3.95	3.5	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	13	7.75	7.1	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	14	2.06	1.2	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	14	3.82	2.7	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	14	6.66	5.55	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	14	10.6	10.5	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	15	1.5	0.95	1.2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	15	3.03	2.15	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	15	4.74	4.4	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	15	9.25	8.45	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	16	3.04	1.75	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	16	5.1	3.55	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	16	8.33	6.65	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	16	12.6	11.85	2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	17	2.21	1.45	1.4	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	17	4.03	2.9	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	17	6.74	5.55	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	17	10.9	9.9	2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	18	4.02	2.4	1.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	18	6.47	4.5	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	18	10.00	7.95	2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	18	18.7	17	2.3	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	20	5.1	3.15	1.8	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	20	7.94	5.55	2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	20	15.20	11.85	2.3	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	20	23.60	23.2	2.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	22	7.35	4.05	2	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	22	11.8	8.6	2.3	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	22	19.60	16.75	2.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	22	33.30	30.45	2.9	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	25	9.80	5.6	2.3	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	25	15.70	10.85	2.6	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	25	22.50	19.65	2.9	10 ～ 550
-	1	7 Days	10	JIS-SWP-A	90°	25	34.3	33.75	3.2	10 ～ 550

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Basic Attributes

Hook Opposing Angle
- 180°
- 90°
Clear
O.D. D(mm)
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

1.5

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

3.5

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

5.6

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

10.9

11.12

11.66

11.8

12.21

12.6

12.70

12.85

13.70

14

14.84

15.13

15.20

15.70

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

33.30

34.3

38.40

39.20

46.6

48.00

54.90
Clear
Reference 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.(mm)
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
Material
- EN 1.4301 (WPB) Equiv.
- JIS-SWP-A
Clear
Filter by CAD data type
- 2D
- 3D
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Optional Attributes

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

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