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Tension Springs/Configurable Length

Tension Springs/Configurable Length

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.

PDF

引張りばね フリー指定タイプ:関連画像引張りばね フリー指定タイプ:関連画像
TypeMaterial
WFSPSWP-A
UFSPSUS304-WPB
TypeMaterial
BWFSPSWP-A
BUFSPSUS304-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 NumberWire
Dia.
d mm
S 1mm IncrementMaximum deflection factor (S)
Standard Spring Constant
(When S = 10)
N/mm
Initial Tension
N
TypeDWFSPUFSPWFSPUFSPWFSPUFSP
BWFSPBUFSPBWFSPBUFSPBWFSPBUFSP
WFSP
UFSP
BWFSP
BUFSP
30.310〜300176%174%0.130.110.180.21
0.482%84%0.600.500.530.64
40.4172%174%0.200.200.310.38
0.596%92%0.750.650.770.92
50.510〜500168%164%0.350.300.490.59
0.6100%102%0.900.801.011.21
60.6158%164%0.500.450.710.85
0.872%72%2.352.052.132.55
70.7140%132%0.650.600.961.15
0.970%64%2.602.252.943.5
80.8148%152%0.900.801.261.51
182%84%2.902.553.044.26
9110〜550112%114%1.951.702.453.43
1.266%66%5.254.654.416.17
101148%140%1.351.201.962.74
1.288%86%3.653.254.316.03
1.458%56%8.507.507.6410.7
111160%152%1.000.851.452.01
1.292%90%2.652.353.244.51
1.462%60%6.205.406.398.87
121232%226%0.750.651.181.65
1.2142%140%1.951.752.843.98
1.492%92%4.554.005.397.55
1.662%60%9.408.308.7212.21
131240%234%0.550.500.931.29
1.2144%142%1.551.352.173.01
1.494%94%3.503.053.955.49
1.664%62%7.106.207.7510.76
141.2208%192%1.201.052.062.88
1.4138%130%2.702.403.825.35
1.694%90%5.554.906.669.32
1.868%66%10.509.3010.614.84
151.2212%196%0.950.851.52.09
1.4140%132%2.151.903.034.21
1.696%92%4.403.804.746.59
1.870%68%8.457.359.2512.85
161.4192%182%1.751.553.044.26
1.6132%130%3.553.155.17.14
1.896%94%6.655.908.3311.66
268%70%11.8510.5012.617.64
171.4194%184%1.451.252.213.08
1.6134%132%2.902.504.035.6
1.898%96%5.554.856.749.37
270%72%9.908.6510.915.13
181.6176%174%2.402.104.025.63
1.8128%128%4.504.006.479.06
294%96%7.957.001014
2.362%60%17.0015.0518.726.18
201.8168%156%3.152.805.17.14
2122%120%5.554.957.9411.12
2.382%80%11.8510.5015.221.28
2.658%58%23.2020.5023.633.04
222150%148%4.053.607.3510.3
2.3106%104%8.607.6011.816.5
2.674%74%16.7514.8019.627.4
2.954%54%30.4526.9533.346.6
252.3144%144%5.604.959.813.7
2.6100%104%10.859.6015.722
2.976%72%19.6517.4022.531.5
3.256%54%33.7529.8534.348
282.6138%128%7.456.6012.717.8
2.9102%98%13.4511.9017.624.6
3.278%74%22.9020.2527.438.4
3.562%58%37.4533.1039.254.9
■Accuracy Standards
• D Dimension Tolerance
D/d*1Tolerance
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% = 288.84Spring 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 

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Part Number
Part NumberMinimum order quantityVolume DiscountDays to ShipRoHSMaterial Hook Opposing Angle Outer Dia. D
(Ø)
Initial Tension
(N)
Standard Spring Constant
(N/mm)
Wire Dia.
(Ø)
S
(mm)

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Basic Information

Type Standard Type

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