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Tension Springs/Configurable Length (Part Numbers)
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.
 [ ! ] How to find L Dimension (free length) [ ! ] Hooks are reversed.
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Specification Table
| 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.
[ ! ] The maximum deflection is shown as % in the web standards table, while the figures in the catalog PDF are for an S dimension of 50.
Whichever value is used, the result of the calculation is the same.
| Part Number | Wire Dia. d mm | S Configurable 1 mm Increments | Max. Deflection Rate (S Dimension) % | Standard Spring Constant (When S Dimension is 10) N/mm | Initial Tension N | ||||
| Type | D | WFSP BWFSP | UFSP BUFSP | WFSP BWFSP | UFSP BUFSP | WFSP BWFSP | UFSP BUFSP | ||
| WFSP UFSP BWFSP BUFSP | 3 | 0.3 | 10 to 300 | 176% | 174% | 0.13 | 0.11 | 0.18 | 0.21 |
| 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 | ||
| 0.5 | 96% | 92% | 0.75 | 0.65 | 0.77 | 0.92 | |||
| 5 | 0.5 | 10 to 500 | 168% | 164% | 0.35 | 0.30 | 0.49 | 0.59 | |
| 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 | ||
| 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 | ||
| 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 | ||
| 1.0 | 82% | 84% | 2.90 | 2.55 | 3.04 | 4.26 | |||
| 9 | 1.0 | 10 to 550 | 112% | 114% | 1.95 | 1.70 | 2.45 | 3.43 | |
| 1.2 | 66% | 66% | 5.25 | 4.65 | 4.41 | 6.17 | |||
| 10 | 1.0 | 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 | 1.0 | 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 | 1.0 | 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 | 1.0 | 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 | 1.50 | 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 | 5.10 | 7.14 | |||
| 1.8 | 96% | 94% | 6.65 | 5.90 | 8.33 | 11.66 | |||
| 2.0 | 68% | 70% | 11.85 | 10.50 | 12.60 | 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 | 5.60 | |||
| 1.8 | 98% | 96% | 5.55 | 4.85 | 6.74 | 9.37 | |||
| 2.0 | 70% | 72% | 9.90 | 8.65 | 10.90 | 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 | |||
| 2.0 | 94% | 96% | 7.95 | 7.00 | 10.00 | 14.00 | |||
| 2.3 | 62% | 60% | 17.00 | 15.05 | 18.70 | 26.18 | |||
| 20 | 1.8 | 168% | 156% | 3.15 | 2.80 | 5.10 | 7.14 | ||
| 2.0 | 122% | 120% | 5.55 | 4.95 | 7.94 | 11.12 | |||
| 2.3 | 82% | 80% | 11.85 | 10.50 | 15.20 | 21.28 | |||
| 2.6 | 58% | 58% | 23.20 | 20.50 | 23.60 | 33.04 | |||
| 22 | 2.0 | 150% | 148% | 4.05 | 3.60 | 7.35 | 10.30 | ||
| 2.3 | 106% | 104% | 8.60 | 7.60 | 11.80 | 16.50 | |||
| 2.6 | 74% | 74% | 16.75 | 14.80 | 19.60 | 27.40 | |||
| 2.9 | 54% | 54% | 30.45 | 26.95 | 33.30 | 46.60 | |||
| 25 | 2.3 | 144% | 144% | 5.60 | 4.95 | 9.80 | 13.70 | ||
| 2.6 | 100% | 104% | 10.85 | 9.60 | 15.70 | 22.00 | |||
| 2.9 | 76% | 72% | 19.65 | 17.40 | 22.50 | 31.50 | |||
| 3.2 | 56% | 54% | 33.75 | 29.85 | 34.30 | 48.00 | |||
| 28 | 2.6 | 138% | 128% | 7.45 | 6.60 | 12.70 | 17.80 | ||
| 2.9 | 102% | 98% | 13.45 | 11.90 | 17.60 | 24.60 | |||
| 3.2 | 78% | 74% | 22.90 | 20.25 | 27.40 | 38.40 | |||
| 3.5 | 62% | 58% | 37.45 | 33.10 | 39.20 | 54.90 | |||
·D Dimension Tolerance
| D/d*1 | Tolerance |
| Less than 8 | ±1.5% of D dimension (Min. ±0.2 mm) |
| 8 to 20 | ±2% of D dimension (Minimum ±0.3 mm) |
·S Dimension Tolerance
If d ≤ 0.5, ±2 × Wire Dia.
(Example: ±0.6 when d = 0.3)
If d ≥ 0.6 ± Wire Dia.
(Example: ±1.0 when d = 1.0)
| ·Calculate the maximum deflection and spring constant using the following formula. | |
| ·Max. Deflection | ·Spring Constant (reference value) |
| Maximum deflection (mm) = S × maximum deflection factor (%) | Spring constant (N/mm) = reference spring constant × 10/S |
Example: Calculation of maximum deflection and spring constant of UFSP20-2.6-498 | |
| Max. Deflection (mm) = 498 × 58% = 288.84 | Spring constant (N/mm) = 20.50 × 10 498 = 0.41 |
[ ! ] The maximum deflection is shown as % in the web standards table, while the figures in the catalog PDF are for an S dimension of 50.
Whichever value is used, the result of the calculation is the same.
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.
Basic Information
| Type | Standard Type |
|---|
Specification/Dimensions
-
Outer Dia. D(Ø)
-
Wire Dia.(Ø)
-
Material
- Stainless Steel Wire
- SWP-A
- Stainless Steel Wire
-
Hook Opposing Angle
- 90°
-
Standard Spring Constant(N/mm)
- 0.07
- 0.09$0.45
- 0.11
- 0.12
- 0.12$0.6
- 0.13
- 0.13$0.65
- 0.16$0.8
- 0.17$0.85
- 0.18
- 0.2
- 0.25$1.25
- 0.27
- 0.27$1.35
- 0.29
- 0.3
- 0.31
- 0.31$1.55
- 0.35
- 0.39
- 0.41$2.05
- 0.43
- 0.47
- 0.47$2.35
- 0.5
- 0.51$2.55
- 0.52
- 0.55
- 0.56$2.8
- 0.6
- 0.65
- 0.75
- 0.88
- 0.9
- 0.95
- 0.98$4.9
- 1
- 1.05
- 1.2
- 1.35
- 1.42
- 1.45
- 1.47$7.35
- 1.55
- 1.7
- 1.75
- 1.9
- 1.95
- 2.1
- 2.15
- 2.25
- 2.35
- 2.4
- 2.5$0.50
- 2.6
- 2.65
- 2.7
- 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$0.93
- 4.85
- 4.95
- 5.25
- 5.4$1.08
- 5.55
- 5.6
- 5.9$1.18
- 6.2
- 6.6
- 6.65
- 7
- 7.1
- 7.45
- 7.5
- 7.6
- 7.95
- 8.3
- 8.45
- 8.5
- 8.6
- 8.65
- 9.3$1.86
- 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$5.39
- 29.85
- 30.45
- 33.1
- 33.75
- 37.45
-
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
-
S(mm)
-
type
- BUFSP
- BWFSP
- UFSP
- WFSP
-
CAD
- 2D
- 3D
Days to Ship
-
- All
- 6 Day(s) or Less
Specify Alterations
- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
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