Spring strip steel

Spring strip steel in an extensive program of stainless steels, precipitation hardening steels and nickel alloys, available in a wide range of sizes and with or without coating.

Sandvik's spring steel is normally supplied with a bright-rolled surface. Other types of surfaces, such as bright-annealed, dull, polished or ground surface can be offered on request. Sandvik's spring steel is delivered on spools, in coils, bundles and as lengths.

Materials for a large variety of springs

Sandvik's wide range of spring steel cover most requirements on material properties. This means that we can deliver strip steel for a wide range of spring applications, such as springs for electronic devices and mechanical springs.

Materials

Spring steel grades

The Sandvik program of spring steel includes the following materials. Other grades, such as martensitic chromium steel and carbon steel can be offered on request.

Austenitic stainless steels
GradeUNSASTMENTensile strength
MPa (ksi)
Width
mm (in.)
Thickness
mm (in.)
Sandvik 12R11 (S30100) (301) 1.4310 800-1900
(116-276)
2-345
(0.08-13.6)
0.015-3
(0.0006-0.12)
Sandvik 11R51 (S30100) (301) 1.4310 1700-2050
(247-297)
2-345
(0.08-13.6)
0.015- 1.5
(0.0006-0.06)
Sandvik 13RM19 - - 1.4369 850-1600
(123-232)
2-345
(0.08-13.6)
0.015-3
(0.0006-.12)
Sandvik 3R12* S30403 304L 1.4306 600-1300
(87-189)
2-325
(0.08-12.8)
0.015-2
(0.0006-0.08)
Sandvik 2RK65 HV N08904 904LVM 1.4539 * * *
Duplex stainless steels
GradeUNSASTMENTensile strength
MPa (ksi)
Width
mm (in.)
Thickness
mm (in.)
Sandvik SAF 2507 S32750 - 1.4410 900-1600
(131-232)
2-300
(0.08-11.8)
0.015-3.5
(0.0006-0.14)
Sandvik Springflex
  • UNS S32205, S31803
- 1.4462 1100-2200 (160-319) 2-300 (0.079 - 12) 0.03 - 3.51 (0.0012 - 0.14)

1Depending on requested tensile strength.

Precipitation hardening steels

GradeUNSASTMENTensile strength
MPa (ksi)
Width
mm (in.)
Thickness
mm (in.)
Sandvik 9RU10 S17700 631 1.4568 1200-1700
(174-247)
2-360
(0.08-14.2)
0.015-3
(0.0006-0.12)
Sandvik 1RK95 S45500 - - 1050-1500
(152-218)
10-330
(0.39-13.0)
1-3.5
(0.039-0.138)
Sandvik Nanoflex - - - 950-1850
(138-268)
2-330
(0.08-13)
0.015-2
(0.0006-0.08)
Sanicro 75X N07750 - - 750- 1350
(109-196)
2-200
(0.08-7.9)
0.015-4
(0.0006-0.16)
Nickel alloys
GradeUNSASTMENTensile strength
MPa (ksi)
Width
mm (in.)
Thickness
mm (in.)
Sanicro 75X N07750 - - 750- 1350
(109-196)
2-200
(0.08-7.9)
0.015-4
(0.0006-0.16)

* Contact us for more information

Material properties

Spring steel properties

The tables show the properties of Sandvik's spring steel grades compared to the normally used ASTM 301.

The more plus signs, the better the properties:

Material properties
Property + ++ +++ ++++ +++++
Fatigue strength


Sandvik 12R11

Sandvik 1RK95

Sandvik 9RU10 Sandvik 11R51
Formability Sandvik 9RU10 Sandvik 1RK95 Sandvik Nanoflex
Non-magnetic Sandvik 13RM19
Tensile strength
(as delivered)
Sandvik 12R11 Sandvik 11R51
Corrosion resistance

Sandvik 12R11

Sandvik 9RU10

Sandvik 3R12

Sandvik Nanoflex

Sandvik 11R51

Sandvik Bioline 316LVM

Sandvik 2RK65 HV

Sandvik SAF 2507

Sanicro 75X

Relaxation resistance Sandvik 11R51 Sandvik 9RU10 Sandvik 1RK95 Sandvik Nanoflex
Elevated temperature Sandvik 11R51

Sandvik Nanoflex

Sandvik 1RK95

Sandvik 9RU10

Sanicro 75X

Sizes

Sizes and tolerances

The Sandvik spring steel program covers the size ranges below. Standard dimensional tolerances is according to the standard EN 10088-1.

Sandvik's spring steel is normally supplied with a bright-rolled surface. Other types of surfaces, such as bright-annealed, dull, polished or ground surface can be offered on request.

Thickness Width Thickness tolerance, mm +/-
Tolerance class
mm mm T1 T2 T3 T4
<0.025 -250
>250-400
0.003
0.004
0.002
0.003
0.0015
0.002
0.001
0.0015
0.025- <0.04 -250
>250-400
0.004
0.005
0.003
0.004
0.002
0.003
0.0015
0.002
0.04- <0.063 -250
>250-400
0.005
0.006
0.004
0.005
0.003
0.004
0.002
0.003
0.063- <0.1 -250
>250-400
0.006
0.007
0.005
0.006
0.004
0.005
0.003
0.004
0.1- <0.125 -250
>250-400
0.007
0.008
0.005
0.006
0.004
0.005
0.003
0.004
0.125- <0.16 -250
>250-400
0.009
0.01
0.006
0.007
0.005
0.006
0.004
0.005
0.16- <0.2 -250
>250-400
0.01
0.011
0.007
0.008
0.005
0.006
0.004
0.005
0.2- <0.25 -250
>250-400
>400-600
0.011
0.013
0.014
0.008
0.009
0.010
0.006
0.007
0.008
0.004
0.006
0.007
0.25- <0.315 -250
>250-400
>400-600
0.013
0.015
0.017
0.009
0.011
0.012
0.007
0.008
0.009
0.005
0.006
0.007
0.315- <0.4 -250
>250-400
>400-600
0.015
0.017
0.020
0.011
0.012
0.014
0.008
0.009
0.010
0.006
0.006
0.008
0.4- <0.5 -250
>250-400
>400-600
0.017
0.020
0.023
0.012
0.014
0.017
0.009
0.010
0.012
0.006
0.007
0.009
0.5- <0.63 -250
>250-400
>400-600
0.020
0.024
0.028
0.014
0.017
0.020
0.010
0.012
0.014
0.007
0.009
0.010
0.63- <0.8 -250
>250-400
>400-600
0.023
0.027
0.032
0.017
0.020
0.023
0.012
0.014
0.016
0.008
0.010
0.012
0.8- <1 -250
>250-400
>400-600
0.027
0.032
0.037
0.019
0.023
0.027
0.013
0.016
0.019
0.009
0.012
0.014
1- <1.25 -250
>250-400
>400-600
0.034
0.036
0.042
0.024
0.026
0.029
0.017
0.018
0.021
0.012
0.013
0.015
1.25- <1.6 -250
>250-400
>400-600
0.039
0.044
0.050
0.028
0.032
0.028
0.020
0.022
0.026
0.014
0.016
0.019
1.6- <2 -250
>250-400
>400-600
0.046
0.050
0.060
0.033
0.038
0.042
0.023
0.026
0.029
0.017
0.019
0.021
2- <2.5 -250
>250-400
>400-600
0.050
0.055
0.065
0.035
0.040
0.050
0.025
0.028
0.033
0.017
0.020
0.024
2.5- <3.15 -250
>250-400
>400-600
0.056
0.060
0.070
0.040
0.043
0.050
0.028
0.030
0.035
0.020
0.022
0.025
3.15- 5 -250
>250-400
>400-600
0.063
0.065
0.080
0.045
0.050
0.060
0.032
0.034
0.040
0.022
0.024
0.029
Thickness Width Thickness tolerance, mm +/-
Tolerance class
mm mm B1 B2 B3 B4
<0.25 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.07
0.10
0.15
0.20
0.30
0.40
0.60
0.05
0.07
0.11
0.15
0.20
0.30
0.40
0.03
0.05
0.07
0.10
0.15
0.20
0.30
0.02
0.035
0.05
0.07
0.10
-
-
0.25- <0.50 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.10
0.15
0.20
0.25
0.35
0.50
0.70
0.07
0.11
0.15
0.20
0.30
0.35
0.50
0.05
0.07
0.10
0.15
0.20
0.25
0.35
0.03
0.05
0.07
0.10
0.15
-
-
0.50- <1.00 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.15
0.20
0.25
0.30
0.40
0.60
0.80
0.11
0.15
0.20
0.25
0.30
0.40
0.60
0.07
0.10
0.15
0.15
0.20
0.30
0.40
0.05
0.07
0.10
0.10
v15
-
-
1.00- <1.60 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.20
0.25
0.30
0.35
0.45
0.70
0.90
0.15
0.20
0.25
0.25
0.35
0.50
0.60
0.10
0.15
0.15
0.20
0.25
0.35
0.40
0.07
0.10
0.10
0.15
0.20
-
-
1.60- <2.00 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.25
0.30
0.35
0.40
0.50
0.70
0.90
0.20
0.20
0.30
0.30
0.35
0.50
0.60
0.15
0.15
0.20
0.20
0.25
0.35
0.40
0.10
0.10
0.15
0.15
0.20
-
-
2.00- <2.50 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
0.35
0.35
0.40
0.45
0.55
0.80
1.00
0.25
0.25
0.30
0.35
0.40
0.60
0.70
0.20
0.20
0.20
0.25
0.30
0.40
0.50
0.15
0.15
0.15
0.20
0.25
-
-
2.50- <4.00 - <20
20- <50
50- <125
125- <250
250- <400
400- <600
600- <800
-
0.40
0.45
0.50
0.60
0.80
1.00
-
0.30
0.30
0.35
0.40
0.60
0.70
-
0.20
0.20
0.25
0.30
0.40
0.50
-
0.15
0.15
0.20
0.25
-
-
Thickness Width Thickness tolerance, in. +/-
Tolerance class
in. in. T1 T2 T3 T4
-<.0010 -9.8
>9.8- 15.7
.00012
.00016
.00008
.00012
.00006
.00008
.00004
.00006
.0010- <.0016 -9.8
>9.8- 15.7
.00016
.00020
.00012
.00016
.00008
.00012
.00006
.00008
.0016- <.0025 -9.8
>9.8- 15.7
.00020
.00024
.00016
.00020
.00012
.00016
.00008
.00012
.0025- <.0039 -9.8
>9.8- 15.7
.00024
.00028
.00020
.00024
.00016
.00020
.00012
.00016
.0039- <.0049 -9.8
>9.8- 15.7
.00028
.00031
.00020
.00024
.00016
.00020
.00012
.00016
.0049- <.0063 -9.8
>9.8- 15.7
.00035
.00039
.00024
.00028
.00020
.00024
.00016
.00020
.0063- <.0079 -9.8
>9.8- 15.7
.00039
.00043
.00028
.00031
.00020
.00024
.00016
.00020
.0079- <.0098 -9.8
>9.8- 15.7
>15.7- 23.6
.00043
.00051
.00055
.00031
.00035
.00039
.00024
.00028
.00031
.00016
.00024
.00028
.0098- <.0124 -9.8
>9.8- 15.7
>15.7- 23.6
.00051
.00059
.00067
.00035
.00043
.00047
.00028
.00031
.00035
.00020
.00024
.00028
.0124- <.0157 -9.8
>9.8- 15.7
>15.7- 23.6
.00059
.00067
.00079
.00043
.00047
.00055
.00031
.00035
.00039
.00024
.00024
.00031
.0157- <.0197 -9.8
>9.8- 15.7
>15.7- 23.6
.00067
.00079
.00091
.00047
.00055
.00067
.00035
.00039
.00047
.00024
.00028
.00035
.0197- <.0248 -9.8
>9.8- 15.7
>15.7- 23.6
.00079
.00094
.00110
.00055
.00067
.00079
.00039
.00047
.00055
.00028
.00035
.00039
.0248- <.0315 -9.8
>9.8- 15.7
>15.7- 23.6
.00091
.00106
.00126
.00067
.00079
.00091
.00047
.00055
.00063
.00031
.00039
.00047
.0315- <.0394 -9.8
>9.8- 15.7
>15.7- 23.6
.00106
.00126
.00146
.00075
.00091
.00106
.00051
.00063
.00075
.00035
.00047
.00055
.0394- <.0492 -9.8
>9.8- 15.7
>15.7- 23.6
.00134
.00142
.00165
.00094
.00102
.00114
.00067
.00071
.00083
.00047
.00051
.00059
.0492- <.0630 -9.8
>9.8- 15.7
>15.7- 23.6
.00153
.00173
.00197
.00110
.00126
.00150
.00079
.00087
.00102
.00055
.00063
.00075
.0630- <.0787 -9.8
>9.8- 15.7
>15.7- 23.6
.00181
.00197
.00236
.00130
.00150
.00165
.00091
.00102
.00114
.00067
.00075
.00083
.0787- <.0984 -9.8
>9.8- 15.7
>15.7- 23.6
.00197
.00216
.00256
.00138
.00157
.00197
.00098
.00110
.00130
.00067
.00079
.00094
.0984- <1.240 -9.8
>9.8- 15.7
>15.7- 23.6
.00220
.00236
.00276
.00157
.00169
.00197
.00110
.00018
.00138
.00079
.00087
.00098
1.240- <1.969 -9.8
>9.8- 15.7
>15.7- 23.6
.00248
.00256
.00315
.00177
.00197
.00236
.00126
.00134
.00157
.00087
.00094
.00114
Thickness Width Thickness tolerance, in. +/-
Tolerance class
in. in. B1 B2 B3 B4
- <.0098 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0028
.0039
.0059
.0079
.0118
.0157
.0236
.0020
.0028
.0043
.0059
.0079
.0118
.0157
.0012
.0020
.0028
.0039
.0059
.0079
.0118
.0008
.0014
.0020
.0028
.0039
-
-
.0098- <.0197 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0039
.0059
.0079
.0098
.0138
.0197
.00276
.0028
.0043
.0059
.0079
.0118
.0138
.0197
.0020
.0028
.0039
.0059
.0079
.0098
.0138
.0012
.0020
.0028
.0039
.0059
-
-
.0197- <.0394 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0059
.0079
.0098
.0118
.0157
.0236
.0315
.0043
.0059
.0079
.0098
.0118
.0157
.0236
.0028
.0039
.0059
.0059
.0079
.0118
.0157
.0020
.0028
.0039
.0039
.0059
-
-
.0394- <.0630 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0079
.0098
.0118
.0138
.0177
.0276
.0354
.0059
.0079
.0098
.0098
.0138
.0197
.0236
.0039
.0059
.0059
.0079
.0098
.0138
.0157
.0028
.0039
.0039
.0059
.0079
-
-
.0630- <.0787 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0098
.0118
.0138
.0157
.0197
.0276
.0354
.0079
.0079
.0118
.0118
.0138
.0197
.0236
.0059
.0059
.0079
.0079
.0098
.0138
.0157
.0039
.0039
.0059
.0059
.0079
-
-
.0787- <.0984 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
.0138
.0138
.0157
.0177
.0217
.0315
.0394
.0098
.0098
.0118
.0138
.0157
.0236
.0276
.0079
.0079
.0079
.0098
.0118
.0157
.0197
.0059
.0059
.0059
.0079
.0098
-
-
.0984- <.1575 - <.79
.79- <1.97
1.97- <4.9
4.9- <9.8
9.8- <15.7
15.7- <23.6
23.6- <31.5
-
.0157
.0177
.0197
.0236
.0315
.0394
-
.0118
.0118
.0138
.0157
.0246
.0276
-
.0079
.0079
.0098
.0118
.0157
.0197
-
.0059
.0059
.0079
.0098
-
-

Tensile strength

Standard tensile strength

Sandvik's spring steel can be supplied with tensile strength according to the table. Contact us for information about tensile strength for other grades.

■ = stock standard
□ = available combination

Thickness Sandvik 12R11 Sandvik 11R51 Sandvik 9RU10
mm Tensile strength (MPa) Tensile strength (MPa) Tensile strength (MPa)
1300 1500 1700 1700 1900 2050 1300 1500 1700
0.010 -
- - - - - - -
0.015 -
- -
0.03
0.04
0.05
0.08
0.10
0.15
0.20
0.25
0.30
0.40
0.50
-
-
0.60
-
-
0.70
-
-
0.80
-
-
0.90
- -
-
1.0
- -
-
1.5
- -
-
2.0
- - - -
- -
2.5
- - - - -
- -
3.0 - - - - - -
- -

Applications

Spring steel applications

Sandvik's wide range of spring strip steel covers most requirements on material properties. This means that we can deliver strip steel for a wide range of spring applications, such as:

  • Brake springs
  • Brush springs
  • Cage clamp springs
  • Contact springs
  • Diaphragms
  • Disc springs
  • Dome springs
  • Hinge springs
  • Non-magnetic springs
  • Springs for electric and electronic components and appliances
  • Springs for motorized tools and compressors
  • Springs for nuclear applications