Tension Springs / Configurable Length
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Specifications
| Part Number | - | d | - | S |
| WFSP3 UFSP20 | - - | 0.3 2.6 | - - | 10 498 |
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 | ||
| 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 |
| 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 | 10〜500 | 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 | 82% | 84% | 2.90 | 2.55 | 3.04 | 4.26 | |||
| 9 | 1 | 10〜550 | 112% | 114% | 1.95 | 1.70 | 2.45 | 3.43 | |
| 1.2 | 66% | 66% | 5.25 | 4.65 | 4.41 | 6.17 | |||
| 10 | 1 | 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
*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)
• 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) |
• 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 |
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 |
Standard Unit Price
| Minimum order quantity | Volume Discount | 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 | EN 1.4301 (WPB) Equiv. | 180° | 3 | 0.21 | 0.11 | 0.3 | 10 ～ 300 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 3 | 0.64 | 0.5 | 0.4 | 10 ～ 300 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 4 | 0.38 | 0.2 | 0.4 | 10 ～ 300 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 4 | 0.92 | 0.65 | 0.5 | 10 ～ 300 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 5 | 0.59 | 0.3 | 0.5 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 5 | 1.21 | 0.8 | 0.6 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 6 | 0.85 | 0.45 | 0.6 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 6 | 2.55 | 2.05 | 0.8 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 7 | 1.15 | 0.6 | 0.7 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 7 | 3.5 | 2.25 | 0.9 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 8 | 1.51 | 0.8 | 0.8 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 8 | 4.26 | 2.55 | 1 | 10 ～ 500 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 9 | 3.43 | 1.7 | 1 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 9 | 6.17 | 4.65 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 10 | 2.74 | 1.2 | 1 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 10 | 6.03 | 3.25 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 10 | 10.70 | 7.5 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 11 | 2.01 | 0.85 | 1 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 11 | 4.51 | 2.35 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 11 | 8.87 | 5.4 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 12 | 1.65 | 0.65 | 1 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 12 | 3.98 | 1.75 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 12 | 7.55 | 4 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 12 | 12.21 | 8.3 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 13 | 1.29 | 0.5 | 1 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 13 | 3.01 | 1.35 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 13 | 5.49 | 3.05 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 13 | 10.76 | 6.2 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 14 | 2.88 | 1.05 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 14 | 5.35 | 2.4 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 14 | 9.32 | 4.9 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 14 | 14.84 | 9.3 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 15 | 2.09 | 0.85 | 1.2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 15 | 4.21 | 1.9 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 15 | 6.59 | 3.8 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 15 | 12.85 | 7.35 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 16 | 4.26 | 1.55 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 16 | 7.14 | 3.15 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 16 | 11.66 | 5.9 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 16 | 17.64 | 10.5 | 2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 17 | 3.08 | 1.25 | 1.4 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 17 | 5.6 | 2.5 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 17 | 9.37 | 4.85 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 17 | 15.13 | 8.65 | 2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 18 | 5.63 | 2.1 | 1.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 18 | 9.06 | 4 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 18 | 14 | 7 | 2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 18 | 26.18 | 15.05 | 2.3 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 20 | 7.14 | 2.8 | 1.8 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 20 | 11.12 | 4.95 | 2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 20 | 21.28 | 10.5 | 2.3 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 20 | 33.04 | 20.5 | 2.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 22 | 10.3 | 3.6 | 2 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 22 | 16.5 | 7.6 | 2.3 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 22 | 27.4 | 14.8 | 2.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 22 | 46.6 | 26.95 | 2.9 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 25 | 13.70 | 4.95 | 2.3 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 25 | 22.00 | 9.6 | 2.6 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 25 | 31.50 | 17.4 | 2.9 | 10 ～ 550 | ||
- | 1 | 7 Days | 10 | EN 1.4301 (WPB) Equiv. | 180° | 25 | 48.00 | 29.85 | 3.2 | 10 ～ 550 |
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Basic information
| Type | Standard Type |
|---|
Configure
Basic Attributes
-
Material
- EN 1.4301 (WPB) Equiv.
- JIS-SWP-A
-
O.D. D(mm)
-
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
-
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
-
Wire Dia.(mm)
-
S(mm)
-
Type
- BUFSP
- BWFSP
- UFSP
- WFSP
-
Hook Opposing Angle
- 180°
- 90°
-
Filter by CAD data type
- 2D
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Filter by standard shipping days
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- 7 Days or Less
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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