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Round Wire Springs -Spring Constant 1.5~3.9 N/mm- (Part Numbers)

・Materials
[ M ] Material: Spring Steel (ASTM A228)

Specifications

Round Wire Springs -Spring Constant 1.5~3.9 N/mm-:
■WT: Fmax. (Allowable Deflection) = L x 40% (L x 35%)
d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
0.3 1.73 2 2.9{0.3} WT3- 5*
0.4 5 4 5.9{0.6} 10*
0.45 8.78 6 8.8{0.9} 15*
0.45 8.78 8 11.8{1.2} 20*
0.5 14.5 10 14.7{1.5} 25*
0.4 2.7 2 2.9{0.3} WT4- 5*
0.4 2.7 4 5.9{0.6} 10*
0.5 6.5 6 8.8{0.9} 15*
0.55 9.63 8 11.8{1.2} 20
0.55 9.63 10 14.7{1.5} 25
0.6 15 12 17.7{1.8} 30
0.6 15 14 20.6{2.1} 35
0.65 22.1 16 23.5{2.4} 40
0.45 2.36 2 3.9{0.4} WT5- 5*
0.5 3.25 4 7.8{0.8} 10*
0.6 6.3 6 11.8{1.2} 15
0.6 6.3 8 15.7{1.6} 20
0.7 12.6 10 19.6{2.0} 25
0.7 12.6 12 23.5{2.4} 30
0.75 17.3 14 27.5{2.8} 35
0.75 17.3 14 27.5{2.8} (40)
0.8 24 15.8 30.9{3.2} (45)
0.8 24 17.5 34.3{3.5} (50)
0.85 32.3 19.3 37.8{3.9} (55)
0.85 32.3 21 41.2{4.2} (60)
0.85 34 22.7 44.5{4.5} (65)
0.9 44.6 24.5 48.1{4.9} (70)
0.5 2.38 2 3.9{0.4} WT6- 5*
0.6 4.35 4 7.8{0.8} 10
0.6 4.35 6 11.8{1.2} 15
0.7 7.7 8 15.7{1.6} 20
0.7 7.7 10 19.6{2.0} 25
0.8 14 12 23.5{2.4} 30
0.8 14 14 27.5{2.8} 35
0.85 18.7 16 31.4{3.2} 40
0.85 18.7 18 35.3{3.6} 45
0.9 24.8 20 39.2{4.0} 50
0.9 24.8 19 37.8{3.9} (55)
0.9 24.8 21 41.2{4.2} (60)
0.9 26.1 22.7 44.5{4.5} (65)
1 43 24.5 48.1{4.9} (70)
1 43 28 54.9{5.6} (80)

d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
0.7 4.38 4 7.8{0.8} WT8- 10
0.8 6.8 6 11.8{1.2} 15
0.8 6.8 8 15.7{1.6} 20
0.8 6.8 10 19.6{2.0} 25
0.9 10.8 12 23.5{2.4} 30
0.9 10.8 14 27.5{2.8} 35
1 17.5 16 31.4{3.2} 40
1 17.5 18 35.3{3.6} 45
1 17.5 20 39.2{4.0} 50
1.1 27.5 22 43.1{4.4} 55
1.1 27.5 24 47.1{4.8} 60
1.1 27.5 26 51.0{5.2} 65
1.1 27.5 28 54.9{5.6} 70
1.2 42 32 62.8{6.4} 80
0.85 5.53 4 7.8{0.8} WT10- 10
0.9 6.75 6 11.8{1.2} 15
0.9 6.75 8 15.7{1.6} 20
1 10 10 19.6{2.0} 25
1 10 12 23.5{2.4} 30
1 10 14 27.5{2.8} 35
1 10 16 31.4{3.2} 40
1.1 14.3 18 35.3{3.6} 45
1.1 14.3 20 39.2{4.0} 50
1.2 21.6 22 43.1{4.4} 55
1.2 21.6 24 47.1{4.8} 60
1.2 21.6 26 51.0{5.2} 65
1.3 32.5 28 54.9{5.6} 70
1.3 32.5 32 62.8{6.4} 80
1 6 6 11.8{1.2} WT13- 15
1.1 8.25 8 15.7{1.6} 20
1.1 8.25 10 19.6{2.0} 25
1.2 11.1 12 23.5{2.4} 30
1.2 11.1 14 27.5{2.8} 35
1.2 11.1 16 31.4{3.2} 40
1.2 11.1 18 35.3{3.6} 45
1.3 15.6 20 39.2{4.0} 50
1.3 15.6 22 43.1{4.4} 55
1.3 15.6 24 47.1{4.8} 60
1.4 21 26 51.0{5.2} 65
1.4 21 28 54.9{5.6} 70
1.4 21 32 62.8{6.4} 80
1.2 7.5 6 11.8{1.2} WT16- 15
1.3 9.43 8 15.7{1.6} 20
1.4 12.6 10 19.6{2.0} 25
1.4 12.6 12 23.5{2.4} 30
1.4 12.6 14 27.5{2.8} 35
1.4 12.6 16 31.4{3.2} 40
1.6 22.4 18 35.3{3.6} 45
1.6 22.4 20 39.2{4.0} 50
1.6 22.4 22 43.1{4.4} 55
1.7 28.9 24 47.1{4.8} 60
1.7 28.9 26 51.0{5.2} 65
1.7 28.9 28 54.9{5.6} 70
1.7 28.9 32 62.8{6.4} 80

d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
1.6 10.8 8 31.4{3.2} WT18- 20
1.7 13.6 10 39.2{4.0} 25
1.7 13.6 12 47.1{4.8} 30
1.7 13.6 14 54.9{5.6} 35
1.8 16.7 16 62.8{6.4} 40
1.9 20.5 18 70.6{7.2} 45
1.9 20.5 20 78.5{8.0} 50
2 26 22 86.3{8.8} 55
2 26 24 94.1{9.6} 60
2 26 26 102.0{10.4} 65
2 26 28 109.8{11.2} 70
2.1 31.5 32 125.5{12.8} 80
1.8 11.3 8 31.4{3.2} WT22- 20
1.8 11.3 10 39.2{4.0} 25
1.9 13.3 12 47.1{4.8} 30
1.9 13.3 14 54.9{5.6} 35
2 16 16 62.8{6.4} 40
2.1 19.5 18 70.6{7.2} 45
2.1 19.5 20 78.5{8.0} 50
2.3 28.2 22 86.3{8.8} 55
2.3 28.2 24 94.1{9.6} 60
2.3 28.2 26 102.0{10.4} 65
2.3 28.2 28 109.8{11.2} 70
2.4 33.6 32 125.5{12.8} 80
2.1 13.2 12 47.1{4.8} WT27- 30
2.3 17.9 14 54.9{5.6} 35
2.3 17.9 16 62.8{6.4} 40
2.4 20.4 18 70.6{7.2} 45
2.6 28.6 20 78.5{8.0} 50
2.6 28.6 22 86.3{8.8} 55
2.6 28.6 24 94.1{9.6} 60
2.6 28.6 26 102.0{10.4} 65
2.8 39.2 28 109.8{11.2} 70
2.8 39.2 32 125.5{12.8} 80
- Load Calculation Method: Load = Spring Constant x Deflection
    (Int'l Unit)N=N/mmxFmm
kgf=kgf/mmxFmm
(kgf=Nx0.101972)

[ ! ]Allowable Deflection of (L) Size
WT5-40Fmax.= L x 35%
WT5-45Fmax.= L x 35%
WT5-50Fmax.= L x 35%
WT5-55Fmax.= L x 35%
WT5-60Fmax.= L x 35%
WT5-65Fmax.= L x 35%
WT5-70Fmax.= L x 35%
WT6-55Fmax.= L x 35%
WT6-60Fmax.= L x 35%
WT6-65Fmax.= L x 35%
WT6-70Fmax.= L x 35%
WT6-80Fmax.= L x 35%

[ ! ]Both ends of * marked WT Type springs are not ground.
[ ! ]The values of solid length are for reference only.
 There may be some variations depending on the lot.
[ ! ]Operation frequency: One million times
[ ! ]Product Overview >> Click here
[ ! ]How to use coil springs and precautions >> Click here
■Spring Constant [ ! ]D12 and 14 for WY Type and D12,14 and 20 for WT Type are not available.
  Type WY WR WF WL WT WM WH WB
D  
2                     0.5{0.05}                          
3   N/mm
0.1
{kgf/mm} {0.01}
    N/mm 0.3
{kgf/mm} {0.03}
    N/mm 0.5
{kgf/mm} {0.05}
    N/mm 1.0
{kgf/mm} {0.1}
    1.5
{0.15}
    2.0
{0.2}
          3.9{0.4}  
4                           2.9{0.3}     4.9{0.5}  
5                   N/mm 2.0
{kgf/mm} {0.2}
    N/mm 2.9
{kgf/mm} {0.3}
    N/mm 5.9
{kgf/mm} {0.6}
    N/mm 9.8
{kgf/mm} {1.0}
 
6                                
8                                
10   N/mm 0.2
{kgf/mm} {0.02}
                             
12                                
13                           N/mm 9.8
{kgf/mm} {1.0}
    N/mm 19.6
{kgf/mm} {2.0}
 
14                                
16                                
18         N/mm 0.5
{kgf/mm} {0.05}
    N/mm 1.0
{kgf/mm} {0.1}
    N/mm 2.9
{kgf/mm} {0.3}
    N/mm 3.9
{kgf/mm} {0.4}
    N/mm 4.9
{kgf/mm} {0.5}
    N/mm 14.7
{kgf/mm} {1.5}
    29.4{3.0}  
20                                    
22                                 N/mm 29.4
{kgf/mm} {3.0}
 
27                                  
Fmax. F=Lx75% F=Lx60% F=Lx45% F=Lx40% F=Lx40% F=Lx35% F=Lx30% F=Lx25%
■WM:Fmax. (Allowable Deflection) = L x 35%
d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
0.35 2.5 1.8 3.4{0.4} WM 3- 5*
0.38 3.3 3.5 6.9{0.7}     10*
0.45 7 5.3 10.3{1.1}     15*
0.5 11.5 7 13.7{1.4}     20*
0.5 11.5 7.5 14.7{1.5}     (25)
0.55 20.4 9 17.7{1.8}     (30)
0.4 2.3 1.7 3.9{0.4} WM 4- 5*
0.45 3.4 3.5 6.9{0.7}     10*
0.5 5.1 5.2 10.8{1.1}     15*
0.55 7.7 7 13.7{1.4}     20
0.6 11.7 8.7 17.7{1.8}     25
0.6 11.7 10.5 20.6{2.1}     30
0.65 17.6 12.2 24.0{2.5}     35
0.65 17.6 12 23.5{2.4}     (40)
0.5 2.8 1.7 4.9{0.5} WM 5- 5*
0.6 4.2 3.5 9.8{1.0}     10
0.65 6.5 5.2 14.7{1.5}     15
0.65 6.5 7 20.6{2.1}     20
0.7 9.1 8.7 25.5{2.6}     25
0.75 12.7 10.5 30.4{3.1}     30
0.8 17.4 12.2 35.3{3.6}     35
0.85 23.8 14 41.2{4.2}     40
0.85 23.8 15.8 46.1{4.7}     45
0.9 23.8 15 43.5{4.5}     (50)
0.9 30 16.5 49.0{5.0}     (55)
0.9 30 18 53.0{5.4}     (60)
0.9 30 17.6 52.0{5.3}     (65)
0.9 30 19.6 58.8{6.0}     (70)
0.55 2.8 1.7 4.9{0.5} WM 6- 5*
0.65 4.7 3.5 9.8{1.0}     10
0.75 8 5.2 14.7{1.5}     15
0.75 8 7 20.6{2.1}     20
0.85 13.6 8.7 25.5{2.6}     25
0.85 13.6 10.5 30.4{3.1}     30
0.9 18 12.2 35.3{3.6}     35
0.9 18 14 41.2{4.2}     40
0.9 18 15.8 46.1{4.7}     45
0.9 18 17.5 51.0{5.2}     50
1.0 31 19.2 55.9{5.7}     55
1.0 31 18 53.0{5.4}     (60)
1.0 31 18.8 54.9{5.6}     (65)
1.1 47.3 20 58.8{6.0}     (70)
1.1 48.4 22.4 65.9{6.7}     (80)
0.75 4.2 3.5 9.8{1.0} WM 8- 10
0.9 8.5 5.2 14.7{1.5}     15
0.9 8.5 7 20.6{2.1}     20
0.9 8.5 8.7 25.5{2.6}     25
0.9 8.5 10.5 30.4{3.1}     30
1.0 13 12.2 35.3{3.6}     35
1.0 13 14 41.2{4.2}     40
1.1 19.8 15.8 46.1{4.7}     45
1.1 19.8 17.5 51.0{5.2}     50
1.2 31.2 19.2 55.9{5.7}     55
1.2 31.2 21 61.8{6.3}     60
1.2 31.2 22.7 64.7{6.6}     65
1.2 31.2 24.5 71.6{7.3}     70
1.3 44.2 28 82.4{8.4}     80

d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
0.9 5.2 3.5 9.8{1.0} WM 10- 10
1.0 7.7 5.2 14.7{1.5}     15
1.0 7.7 7 20.6{2.1}     20
1.1 11 8.7 25.5{2.6}     25
1.1 11 10.5 30.4{3.1}     30
1.2 16.2 12.2 35.3{3.6}     35
1.2 16.2 14 41.2{4.2}     40
1.3 22.1 15.8 46.1{4.7}     45
1.3 22.1 17.5 51.0{5.2}     50
1.3 22.1 19.2 55.9{5.7}     55
1.4 32.1 21 61.8{6.3}     60
1.4 32.1 22.7 64.7{6.6}     65
1.4 32.1 24.5 71.6{7.3}     70
1.4 32.2 28 82.4{8.4}     80
1.0 5.5 3.5 10.3{1.1} WM 12- 10
1.1 7.4 5.2 14.7{1.5}     15
1.1 7.4 7 20.6{2.1}     20
1.1 7.4 8.7 25.5{2.6}     25
1.2 10.2 10.5 30.4{3.1}     30
1.2 10.2 12.2 35.3{3.6}     35
1.3 14.3 14 41.2{4.2}     40
1.3 14.3 15.8 46.1{4.7}     45
1.3 14.3 17.5 51.0{5.2}     50
1.4 19.6 19.2 55.9{5.7}     55
1.4 19.6 21 61.8{6.3}     60
1.5 26.3 22.7 64.7{6.6}     65
1.5 26.3 24.5 71.6{7.3}     70
1.6 36.8 28 82.4{8.4}     80
1.0 5 3.5 10.3{1.1} WM 13- 10
1.2 8.4 5.2 14.7{1.5}     15
1.3 11.7 7 20.6{2.1}     20
1.3 11.7 8.7 25.5{2.6}     25
1.4 14.5 10.5 30.4{3.1}     30
1.4 14.5 12.2 35.3{3.6}     35
1.4 14.5 14 41.2{4.2}     40
1.4 14.5 15.8 46.1{4.7}     45
1.4 14.5 17.5 51.0{5.2}     50
1.5 22.5 19.2 55.9{5.7}     55
1.5 22.5 21 61.8{6.3}     60
1.6 28.8 22.7 64.7{6.6}     65
1.6 28.8 24.5 71.6{7.3}     70
1.7 37.4 28 82.4{8.4}     80
1.7 37.4 31.5 92.9{9.5}     90
1.2 7.5 5.2 14.7{1.5} WM 14- 15
1.3 9.8 7 20.6{2.1}     20
1.4 13.3 8.7 25.5{2.6}     25
1.4 13.3 10.5 30.4{3.1}     30
1.4 13.3 12.2 35.3{3.6}     35
1.4 13.3 14 41.2{4.2}     40
1.5 17.3 15.8 46.1{4.7}     45
1.5 17.3 17.5 51.0{5.2}     50
1.5 17.3 19.2 55.9{5.7}     55
1.6 23.2 21 61.8{6.3}     60
1.6 23.2 22.7 64.7{6.6}     65
1.7 30.6 24.5 71.6{7.3}     70
1.7 30.6 28 82.4{8.4}     80
1.8 39.6 31.5 92.7{9.5}     90

d Solid Length F
max.
Load
N{kgf}
max.
Part Number
Type D-L
1.3 7.8 5.2 14.7{1.5} WM 16- 15
1.4 9.8 7 20.6{2.1}     20
1.5 12.5 8.7 25.5{2.6}     25
1.5 12.5 10.5 30.4{3.1}     30
1.6 15 12.2 35.3{3.6}     35
1.6 15 14 41.2{4.2}     40
1.7 20.4 15.8 46.1{4.7}     45
1.7 20.4 17.5 51.0{5.2}     50
1.8 27 19.2 55.9{5.7}     55
1.8 27 21 61.8{6.3}     60
1.8 27 22.7 64.7{6.6}     65
1.8 27 24.5 71.6{7.3}     70
1.8 27 28 82.4{8.4}     80
1.9 34.2 31.5 92.7{9.5}     90
1.7 11.9 7 34.3{3.5} WM 18- 20
1.8 14.4 8.7 42.2{4.3}     25
1.8 14.4 10.5 51.0{5.2}     30
1.8 14.4 12.2 59.8{6.1}     35
1.8 14.4 14 68.6{7.0}     40
2.0 22 15.8 77.5{7.9}     45
2.0 22 17.5 85.3{8.7}     50
2.0 22 19.2 94.1{9.6}     55
2.0 22 21 103.0{10.5}     60
2.2 34.1 22.7 110.8{11.3}     65
2.2 34.1 24.5 119.6{12.2}     70
2.2 34.1 28 137.3{14.0}     80
2.3 41.4 31.5 154.0{15.7}     90
2.3 41.4 35 171.6{17.5}     100
1.8 11.7 7 34.3{3.5} WM 20- 20
1.8 11.7 8.7 42.2{4.3}     25
1.9 14.3 10.5 51.0{5.2}     30
1.9 14.3 12.2 59.8{6.1}     35
1.9 14.3 14 68.6{7.0}     40
2.0 17 15.8 77.5{7.9}     45
2.0 17 17.5 85.3{8.7}     50
2.2 24.8 19.2 94.1{9.6}     55
2.2 24.8 21 103.0{10.5}     60
2.2 24.8 22.7 110.8{11.3}     65
2.2 24.8 24.5 119.6{12.2}     70
2.4 36 28 137.3{14.0}     80
2.4 36 31.5 154.0{15.7}     90
2.4 36 35 171.6{17.5}     100
1.9 12 7 34.3{3.5} WM 22- 20
2.0 14 8.7 42.2{4.3}     25
2.0 14 10.5 51.0{5.2}     30
2.0 14 12.2 59.8{6.1}     35
2.0 14 14 68.6{7.0}     40
2.3 23 15.8 77.5{7.9}     45
2.3 23 17.5 85.3{8.7}     50
2.3 23 19.2 94.1{9.6}     55
2.3 23 21 103.0{10.5}     60
2.4 30 22.7 110.8{11.3}     65
2.4 30 24.5 119.6{12.2}     70
2.4 30 28 137.3{14.0}     80
2.6 40 31.5 154.0{15.7}     90
2.6 40 35 171.6{17.5}     100
2.3 14 10.5 51.0{5.2} WM 27- 30
2.4 17 12.2 59.8{6.1}     35
2.4 17 14 68.6{7.0}     40
2.4 18 15.8 77.5{7.9}     45
2.6 23 17.5 85.3{8.7}     50
2.6 23 19.2 94.1{9.6}     55
2.6 23 21 103.0{10.5}     60
2.8 31 22.7 110.8{11.3}     65
2.8 31 24.5 119.6{12.2}     70
2.8 31 28 137.3{14.0}     80
3.0 43.5 31.5 154.0{15.7}     90
3.0 43.5 35 171.6{17.5}     100
- Load Calculation Method: Load = Spring Constant x Deflection
    (Int'l Unit)N=N/mmxFmm
kgf=kgf/mmxFmm
(kgf=Nx0.101972)

[ ! ]The values of solid length are for reference only.
 There may be some variations depending on the lot.
[ ! ]Operation frequency: One million times
[ ! ]Product Overview >> Click here
[ ! ]How to use coil springs and precautions >> Click here
[ ! ]Allowable Deflection of (L) Size
WM3-25Fmax.= L x 30%
WM3-30Fmax.= L x 30%
WM4-40Fmax.= L x 30%
WM5-50Fmax.= L x 30%
WM5-55Fmax.= L x 30%
WM5-60Fmax.= L x 30%
WM5-65Fmax.= L x 27%
WM5-70Fmax.= L x 28%
WM6-60Fmax.= L x 30%
WM6-65Fmax.= L x 29%
WM6-70Fmax.= L x 28%
WM6-80Fmax.= L x 28%

[ ! ]Both ends of * marked WM Type springs are not ground.

Part Number 

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Part Number
Part NumberMinimum order quantityVolume DiscountDays to Ship RoHSEnd Surface Condition Allowable Load (Configurable Range)
(N)
Max. Load
(N)
Maximum Height when Loaded (Free Length, Allowable Deflection)
(mm)
Free Length L
(mm)
O.D. D (or D1)
(φ)
I.D. D-2d (or D)
(φ)
Spring Constant
(N/mm)
Wire diameter
(φ)
Solid Length
(mm)

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Material SWP-A

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