Round Coil Springs-Fmax. (Allowable Deflection) = Lx40%-45%/O.D. Referenced

Brand :

MISUMI

Caution

Product Description

Round Coil Springs, O.D. Referenced, Piano Wire, WF / WL

Round wire compression springs standardized so that the spring constant is the same for the same outer diameter. Select WF (maximum allowable deflection 45%) or WL (40%) by the required stroke and load.

Material: piano wire (SWP-A).
Solid length is a reference value and may vary slightly by lot. Number of uses: 1,000,000 cycles.
Some WF sizes (marked in the dimension table) have both end faces unground.

Part numbers and dimensions

Ordering example

Type
WF13-60

Spring constant N/mm {kgf/mm}. WY type D12, 14 and WT type D12, 14, 20 are not available.

Type D	WY	WR	WF	WL	WT	WM	WH	WB
Type D	WY	WR	WF	WL	WT	WM	WH	WB
2				0.5{0.05}
3	0.1 {0.01}	0.3 {0.03}	0.5 {0.05}	1.0 {0.1}	1.5 {0.15}	2.0 {0.2}		3.9{0.4}
4					1.5 {0.15}	2.0 {0.2}	2.9{0.3}	4.9{0.5}
5					2.0 {0.2}	2.9 {0.3}	5.9 {0.6}	9.8 {1.0}
6
8
10	0.2{0.02}
12
13							9.8 {1.0}	19.6 {2.0}
14
16
18		0.5 {0.05}	1.0 {0.1}	2.9 {0.3}	3.9 {0.4}	4.9 {0.5}	14.7 {1.5}	29.4{3.0}
20
22								29.4 {3.0}
27								29.4 {3.0}
Fmax.	F=L×75%	F=L×60%	F=L×45%	F=L×40%	F=L×40%	F=L×35%	F=L×30%	F=L×25%

WF: Fmax. (allowable deflection) = L×45%

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
0.26	2	2.25	1.1{0.11}	WF 3-	5*
0.32	5	4.5	2.2{0.22}		10*
0.32	5	6.7	3.2{0.33}		15*
0.35	7	9	4.4{0.45}		20*
0.35	7	11.2	5.5{0.56}		25*
0.4	13.2	13.5	6.6{0.67}		30
0.4	13.2	15.7	7.6{0.78}		35
0.4	13.2	18	8.8{0.9}		40
0.32	2.3	2.25	1.1{0.11}	WF 4-	5*
0.35	3.1	4.5	2.2{0.22}		10*
0.4	5.6	6.7	3.2{0.33}		15*
0.4	5.6	9	4.4{0.45}		20*
0.45	9.9	11.2	5.5{0.56}		25*
0.45	9.9	13.5	6.6{0.67}		30*
0.5	16.5	15.7	7.6{0.78}		35
0.5	16.5	18	8.8{0.9}		40
0.5	16.5	20	9.8{1.0}		45
0.5	16.5	22.5	10.8{1.1}		50
0.5	16.5	24.7	12.1{1.23}		55
0.5	16.5	27	12.7{1.3}		60
0.55	26.4	29.2	14.3{1.46}		65*
0.55	26.4	31.5	15.4{1.58}		70*
0.35	2	2.25	1.1{0.11}	WF 5-	5*
0.38	2.8	4.5	2.2{0.22}		10*
0.4	3.4	6.7	3.2{0.33}		15*
0.45	5.4	9	4.4{0.45}		20*
0.5	8.5	11.2	5.5{0.56}		25*
0.55	13.2	13.5	6.6{0.67}		30
0.55	13.2	15.7	7.6{0.78}		35
0.55	20.4	18	8.8{0.9}		40
0.6	20.4	20	9.8{1.0}		45
0.6	20.4	22.5	10.8{1.1}		50
0.6	20.4	24.7	12.1{1.23}		55
0.6	20.4	27	12.7{1.3}		60
0.6	20.4	29.2	14.3{1.5}		65
0.6	20.4	31.5	15.4{1.6}		70
0.4	2.3	2.25	1.1{0.11}	WF 6-	5*
0.5	5	4.5	2.2{0.22}		10
0.55	8	6.7	3.2{0.33}		15
0.55	8	9	4.4{0.45}		20
0.6	12	11.2	5.5{0.56}		25
0.65	16	13.5	6.6{0.67}		30
0.65	17	15.7	7.6{0.78}		35
0.65	17	18	8.8{0.9}		40
0.65	17	20	9.8{1.0}		45
0.7	25.2	22.5	10.8{1.1}		50
0.7	25.2	24.7	12.1{1.23}		55
0.7	25.2	27	12.7{1.3}		60
0.7	25.2	29.2	14.3{1.46}		65
0.7	25.2	31.5	14.7{1.5}		70
0.7	25.2	36	17.7{1.8}		80
0.6	5	4.5	2.2{0.22}	WF 8-	10
0.65	7.5	6.7	3.2{0.33}		15
0.7	10.8	9	4.4{0.45}		20
0.7	10.8	11.2	5.5{0.56}		25
0.75	14.5	13.5	6.6{0.67}		30
0.75	14.5	15.7	7.6{0.78}		35
0.8	20	18	8.8{0.9}		40
0.8	20	20	9.8{1.0}		45
0.8	20	22.5	10.8{1.1}		50
0.8	20	24.7	12.1{1.23}		55
0.85	27.6	27	12.7{1.3}		60
0.85	27.6	29.2	14.3{1.46}		65
0.85	27.6	31.5	14.7{1.5}		70
0.85	28.1	36	17.7{1.8}		80

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
0.65	5	4.5	2.2{0.22}	WF10-	10
0.65	5	6.7	3.2{0.33}		15
0.8	10.4	9	4.4{0.45}		20
0.8	10.4	11.2	5.5{0.56}		25
0.85	14	13.5	6.6{0.67}		30
0.85	14	15.7	7.6{0.78}		35
0.9	17.5	18	8.8{0.9}		40
0.9	17.5	20	9.8{1.0}		45
0.9	17.5	22.5	10.8{1.1}		50
0.9	17.5	24.7	12.1{1.23}		55
1.0	31	27	12.7{1.3}		60
1.0	31	29.2	14.3{1.46}		65
1.0	31	31.5	14.7{1.5}		70
1.0	31	36	17.7{1.8}		80
0.7	4.6	4.5	2.3{0.23}	WF12-	10
0.7	4.6	6.7	3.2{0.33}		15
0.8	7.2	9	4.4{0.45}		20
0.8	7.2	11.2	5.5{0.56}		25
0.9	11.3	13.5	6.6{0.67}		30
0.9	11.3	15.7	7.6{0.78}		35
0.9	11.3	18	8.8{0.9}		40
0.9	11.3	20	9.8{1.0}		45
1.0	18	22.5	10.8{1.1}		50
1.0	18	24.7	12.1{1.23}		55
1.0	18	27	12.7{1.3}		60
1.0	18	29.2	14.3{1.46}		65
1.1	28.1	31.5	14.7{1.5}		70
1.1	27.5	36	17.7{1.8}		80
0.75	4.9	4.5	2.3{0.23}	WF13-	10
0.8	6	6.7	3.2{0.33}		15
0.8	6	9	4.4{0.45}		20
0.85	7.2	11.2	5.5{0.56}		25
1.0	15	13.5	6.6{0.67}		30
1.0	15	15.7	7.6{0.78}		35
1.0	15	18	8.8{0.9}		40
1.0	15	20	9.8{1.0}		45
1.0	15	22.5	10.8{1.1}		50
1.1	22	24.7	12.1{1.23}		55
1.1	22	27	12.7{1.3}		60
1.1	22	29.2	14.3{1.46}		65
1.1	22	31.5	14.7{1.5}		70
1.1	22	36	17.7{1.8}		80
1.2	33.6	40.5	19.9{2.0}		90
0.8	5.2	6.7	3.2{0.33}	WF14-	15
0.9	7.9	9	4.4{0.45}		20
0.9	7.9	11.2	5.5{0.56}		25
1.0	12	13.5	6.6{0.67}		30
1.0	12	15.7	7.6{0.78}		35
1.0	12	18	8.8{0.9}		40
1.0	12	20	9.8{1.0}		45
1.1	18.2	22.5	10.8{1.1}		50
1.1	18.2	24.7	12.1{1.23}		55
1.1	18.2	27	12.7{1.3}		60
1.2	27.6	29.2	14.3{1.46}		65
1.2	27.6	31.5	14.7{1.5}		70
1.2	27.6	36	17.7{1.8}		80
1.3	39.7	40.5	19.9{2.0}		90

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
0.9	6.3	6.7	3.2{0.33}	WF16-	15
1.0	8.7	9	4.4{0.45}		20
1.0	8.7	11.2	5.5{0.56}		25
1.1	12.8	13.5	6.6{0.67}		30
1.1	12.8	15.7	7.6{0.78}		35
1.2	18.6	18	8.8{0.9}		40
1.2	18.6	20	9.8{1.0}		45
1.2	18.6	22.5	10.8{1.1}		50
1.2	18.6	24.7	12.1{1.23}		55
1.3	26.8	27	12.7{1.3}		60
1.3	26.8	29.2	14.3{1.46}		65
1.3	26.8	31.5	14.7{1.5}		70
1.4	36	36	17.7{1.8}		80
1.4	36.4	40.5	19.9{2.0}		90
1.2	9	9	8.8{0.9}	WF18-	20
1.3	12.4	11.2	10.8{1.1}		25
1.3	12.4	13.5	12.7{1.3}		30
1.4	16.1	15.7	14.7{1.5}		35
1.5	21	18	17.7{1.8}		40
1.5	21	20	19.9{2.03}		45
1.5	21	22.5	22.1{2.25}		50
1.6	28.8	24.7	24.3{2.48}		55
1.6	28.8	27	26.5{2.7}		60
1.6	28.8	29.2	28.7{2.93}		65
1.7	37.4	31.5	30.9{3.15}		70
1.7	37.4	36	35.3{3.6}		80
1.2	7.2	9	8.8{0.9}	WF20-	20
1.3	9.8	11.2	10.8{1.1}		25
1.4	12.6	13.5	12.7{1.3}		30
1.4	12.6	15.7	14.7{1.5}		35
1.5	16.5	18	17.7{1.8}		40
1.5	16.5	20	19.9{2.03}		45
1.6	21.6	22.5	22.1{2.25}		50
1.6	21.6	24.7	24.3{2.48}		55
1.6	21.6	27	26.5{2.7}		60
1.7	28.1	29.2	28.7{2.93}		65
1.7	28.1	31.5	30.9{3.15}		70
1.7	28.1	36	35.3{3.6}		80
1.3	7.8	9	8.8{0.9}	WF22-	20
1.4	10.5	11.2	11.0{1.12}		25
1.4	10.5	13.5	13.2{1.35}		30
1.5	13.5	15.7	15.4{1.57}		35
1.5	13.5	18	17.7{1.8}		40
1.7	22.1	20.2	19.8{2.02}		45
1.7	22.1	22.5	22.1{2.25}		50
1.7	22.1	24.7	24.2{2.47}		55
1.8	28.8	27	26.5{2.7}		60
1.8	28.8	29.2	28.6{2.92}		65
1.8	28.8	31.5	30.9{3.15}		70
1.8	28.8	36	35.3{3.6}		80
1.7	14.1	13.5	13.2{1.35}	WF27-	30
1.7	14.1	15.7	15.4{1.57}		35
1.7	14.1	18	17.7{1.8}		40
1.9	21.4	20.2	19.8{2.02}		45
1.9	21.4	22.5	22.1{2.25}		50
2.0	26	24.7	24.2{2.47}		55
2.0	26	27	26.5{2.7}		60
2.0	26	29.2	28.6{2.92}		65
2.0	26	31.5	30.9{3.15}		70
2.0	26	36	35.3{3.6}		80

Load calculation: load = spring constant × deflection

(SI units) N = N/mm × F mm; kgf = kgf/mm × F mm

(kgf=N×0.101972)

WF types marked * have unground end faces.

Solid length is a reference value. Values vary slightly between lots.

Service life: 1 million cycles

WL: Fmax. (allowable deflection) = L×40%

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
0.2	1.7	2	0.98{0.1}	WL 2-	5*
0.26	5.2	4	2.0 {0.2}		10*
0.26	5.2	6	2.9 {0.3}		15*
0.29	9	8	3.9 {0.4}		20*
0.29	9	10	4.9 {0.5}		25*
0.3	10.8	12	5.9 {0.6}		30*
0.3	2.1	2	2.0 {0.2}	WL 3-	5*
0.35	3.9	4	3.9 {0.4}		10*
0.4	6.5	6	5.9 {0.6}		15*
0.4	6.5	8	7.8 {0.8}		20*
0.45	13	10	9.8 {1.0}		25*
0.45	13	12	11.8 {1.2}		30*
0.45	13	14	13.7 {1.4}		35*
0.5	21	16	15.7 {1.6}		40*
0.35	2.1	2	2.0 {0.2}	WL 4-	5*
0.45	5	4	3.9 {0.4}		10*
0.45	5	6	5.9 {0.6}		15*
0.5	9	8	7.8 {0.8}		20
0.5	9	10	9.8 {1.0}		25
0.55	13.9	12	11.8 {1.2}		30
0.55	13.9	14	13.7 {1.4}		35
0.6	21.6	16	15.7 {1.6}		40
0.6	21.6	18	17.7 {1.8}		45
0.6	21.6	20	19.6 {2.0}		50
0.6	21.6	22	21.6 {2.2}		55
0.65	33	24	23.5 {2.4}		60
0.4	2.3	2	2.0 {0.2}	WL 5-	5*
0.45	3.4	4	3.9 {0.4}		10*
0.5	5	6	5.9 {0.6}		15*
0.55	7.7	8	7.8 {0.8}		20
0.6	10.8	10	9.8 {1.0}		25
0.6	10.8	12	11.8 {1.2}		30
0.65	15.6	14	13.7 {1.4}		35
0.65	15.6	16	15.7 {1.6}		40
0.7	20	18	17.7 {1.8}		45
0.7	20	20	19.6 {2.0}		50
0.7	23.1	22	21.6 {2.2}		55
0.75	33	24	23.5 {2.4}		60
0.75	32.3	26	25.5 {2.6}		65
0.75	32.3	28	27.5 {2.8}		70
0.45	2.5	2	2.0 {0.2}	WL 6-	5*
0.55	4.7	4	3.9 {0.4}		10
0.55	4.7	6	5.9 {0.6}		15
0.65	9	8	7.8 {0.8}		20
0.65	9	10	9.8 {1.0}		25
0.7	13.7	12	11.8 {1.2}		30
0.7	13.7	14	13.7 {1.4}		35
0.7	13.7	16	15.7 {1.6}		40
0.75	18.9	18	17.7 {1.8}		45
0.75	18.9	20	19.6 {2.0}		50
0.75	18.9	22	21.6 {2.2}		55
0.8	26.4	24	23.5 {2.4}		60
0.8	26.4	26	25.5 {2.6}		65
0.85	30.6	28	27.5 {2.8}		70
0.85	34.9	32	31.4 {3.2}		80

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
0.65	4.7	4	3.9{0.4}	WL 8-	10
0.75	8.5	6	5.9{0.6}		15
0.75	8.5	8	7.8{0.8}		20
0.75	8.5	10	9.8{1.0}		25
0.8	11.2	12	11.8{1.2}		30
0.8	11.2	14	13.7{1.4}		35
0.8	11.2	16	15.7{1.6}		40
0.85	15.3	18	17.7{1.8}		45
0.85	15.3	20	19.6{2.0}		50
0.85	15.3	22	21.6{2.2}		55
0.9	19.4	24	23.5{2.4}		60
0.9	19.4	26	25.5{2.6}		65
1.0	31	28	27.5{2.8}		70
1.0	31	32	31.4{3.2}		80
0.75	5.3	4	3.9{0.4}	WL10-	10
0.8	6.4	6	5.9{0.6}		15
0.8	6.4	8	7.8{0.8}		20
0.9	10.8	10	9.8{1.0}		25
0.9	10.8	12	11.8{1.2}		30
0.9	10.8	14	13.7{1.4}		35
0.9	10.8	16	15.7{1.6}		40
1.0	17	18	17.7{1.8}		45
1.0	17	20	19.6{2.0}		50
1.0	17	22	21.6{2.2}		55
1.0	17	24	23.5{2.4}		60
1.1	24	26	25.5{2.6}		65
1.1	24	28	27.5{2.8}		70
1.1	24.2	32	31.4{3.2}		80
0.8	4.8	4	4.0{0.4}	WL12-	10
0.9	7.2	6	5.9{0.6}		15
0.9	7.2	8	7.8{0.8}		20
0.9	7.2	10	9.8{1.0}		25
1.0	10.5	12	11.8{1.2}		30
1.0	10.5	14	13.7{1.4}		35
1.0	10.5	16	15.7{1.6}		40
1.1	15.4	18	17.7{1.8}		45
1.1	15.4	20	19.6{2.0}		50
1.1	15.4	22	21.6{2.2}		55
1.2	22.8	24	23.5{2.4}		60
1.2	22.8	26	25.5{2.6}		65
1.2	22.8	28	27.5{2.8}		70
1.3	34.5	32	31.4{3.2}		80
0.85	5.1	4	4.0{0.4}	WL13-	10
0.9	6.3	6	5.9{0.6}		15
1.0	8.7	8	7.8{0.8}		20
1.0	8.7	10	9.8{1.0}		25
1.1	13.2	12	11.8{1.2}		30
1.1	13.2	14	13.7{1.4}		35
1.1	13.2	16	15.7{1.6}		40
1.1	13.2	18	17.7{1.8}		45
1.1	13.2	20	19.6{2.0}		50
1.1	13.2	22	21.6{2.2}		55
1.1	13.2	24	23.5{2.4}		60
1.2	18.6	26	25.5{2.6}		65
1.2	18.6	28	27.5{2.8}		70
1.4	37.8	32	31.4{3.2}		80
1.4	37.8	36	35.3{3.6}		90
1.0	7.5	6	5.9{0.6}	WL14-	15
1.0	7.5	8	7.8{0.8}		20
1.0	7.5	10	9.8{1.0}		25
1.1	11	12	11.8{1.2}		30
1.1	11	14	13.7{1.4}		35
1.1	11	16	15.7{1.6}		40
1.2	15.6	18	17.7{1.8}		45
1.2	15.6	20	19.6{2.0}		50
1.2	15.6	22	21.6{2.2}		55
1.2	15.6	24	23.5{2.4}		60
1.3	22.1	26	25.5{2.6}		65
1.3	22.1	28	27.5{2.8}		70
1.3	22.1	32	31.4{3.2}		80
1.5	43.5	36	35.3{3.6}		90

d	Solid length (reference)	F max.	Load N {kgf} max.	Type
d	Solid length (reference)	F max.	Load N {kgf} max.	Type D-L
1.1	8.2	6	5.9{0.6}	WL16-	15
1.1	8.2	8	7.8{0.8}		20
1.2	10	10	9.8{1.0}		25
1.2	10	12	11.8{1.2}		30
1.2	10	14	13.7{1.4}		35
1.2	10	16	15.7{1.6}		40
1.4	21	18	17.7{1.8}		45
1.4	21	20	19.6{2.0}		50
1.4	21	22	21.6{2.2}		55
1.4	21	24	23.5{2.4}		60
1.5	29.7	26	25.5{2.6}		65
1.5	29.7	28	27.5{2.8}		70
1.5	29.7	32	31.4{3.2}		80
1.6	40	36	35.3{3.6}		90
1.5	10	8	23.5{2.4}	WL18-	20
1.6	12	10	29.4{3.0}		25
1.6	12	12	35.3{3.6}		30
1.7	16.2	14	41.2{4.2}		35
1.7	16.2	16	47.1{4.8}		40
1.8	19.8	18	53.0{5.4}		45
1.8	19.8	20	58.8{6.0}		50
1.8	19.8	22	64.7{6.6}		55
1.8	19.8	24	70.6{7.2}		60
2.0	32	26	76.5{7.8}		65
2.0	32	28	82.4{8.4}		70
2.0	32	32	94.1{9.6}		80
2.2	43	36	105.9{10.8}		90
2.2	43	40	117.7{12.0}		100
1.6	10.4	8	23.5{2.4}	WL20-	20
1.6	10.4	10	29.4{3.0}		25
1.7	12.8	12	35.3{3.6}		30
1.7	12.8	14	41.2{4.2}		35
1.8	15.8	16	47.1{4.8}		40
1.8	15.8	18	53.0{5.4}		45
1.8	15.8	20	58.8{6.0}		50
1.8	15.8	22	64.7{6.6}		55
2.0	24	24	70.6{7.2}		60
2.0	24	26	76.5{7.8}		65
2.0	24	28	82.4{8.4}		70
2.2	37.4	32	94.1{9.6}		80
2.2	37.4	36	105.9{10.8}		90
2.2	37.4	40	117.7{12.0}		100
1.7	10.8	8	23.5{2.4}	WL22-	20
1.8	13.3	10	29.4{3.0}		25
1.8	13.3	12	35.3{3.6}		30
1.8	13.3	14	41.2{4.2}		35
2.0	20	16	47.1{4.8}		40
2.0	20	18	53.0{5.4}		45
2.0	20	20	58.8{6.0}		50
2.0	20	22	64.7{6.6}		55
2.2	28.6	24	70.6{7.2}		60
2.2	28.6	26	76.5{7.8}		65
2.2	28.6	28	82.4{8.4}		70
2.2	28.6	32	94.1{9.6}		80
2.3	34.5	36	105.9{10.8}		90
2.3	34.5	40	117.7{12.0}		100
2.1	14	12	35.3{3.6}	WL27-	30
2.1	14	14	41.2{4.2}		35
2.3	19	16	47.1{4.8}		40
2.3	19	18	53.0{5.4}		45
2.3	19	20	58.8{6.0}		50
2.3	19	22	64.7{6.6}		55
2.5	28	24	70.6{7.2}		60
2.5	28	26	76.5{7.8}		65
2.6	34.5	28	82.4{8.4}		70
2.6	34.5	32	94.1{9.6}		80
2.8	46.7	36	105.9{10.8}		90
2.8	46.7	40	117.7{12.0}		100

Load calculation: load = spring constant × deflection

WL types marked * have unground end faces.