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.
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
Our wide range of spring steel covers 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
Our program of spring steel includes the following materials. Other grades, such as martensitic chromium steel and carbon steel can be offered on request.
| Grade | UNS | ASTM | EN | Tensile strength MPa (ksi) |
Width mm (in.) |
Thickness mm (in.) |
|---|---|---|---|---|---|---|
| 12R11 | (S30100) | (301) | 1.4310 | 800-1900 (116-276) |
2-345 (0.08-13.6) |
0.015-3 (0.0006-0.12) |
| 11R51 | (S30100) | (301) | 1.4310 | 1700-2050 (247-297) |
2-345 (0.08-13.6) |
0.015- 1.5 (0.0006-0.06) |
| 13RM19 | - | - | 1.4369 | 850-1600 (123-232) |
2-345 (0.08-13.6) |
0.015-3 (0.0006-.12) |
| 3R12* | S30403 | 304L | 1.4306 | 600-1300 (87-189) |
2-325 (0.08-12.8) |
0.015-2 (0.0006-0.08) |
| 2RK65 HV | N08904 | 904LVM | 1.4539 | * | * | * |
| Grade | UNS | ASTM | EN | Tensile strength MPa (ksi) |
Width mm (in.) |
Thickness mm (in.) |
|---|---|---|---|---|---|---|
| SAF 2507 | S32750 | - | 1.4410 | 900-1600 (131-232) |
2-300 (0.08-11.8) |
0.015-3.5 (0.0006-0.14) |
| Springflex |
|
- | 1.4462 | 1100-2200 (160-319) | 2-300 (0.079 - 12) | 0.03 - 3.51 (0.0012 - 0.14) |
| Grade | UNS | ASTM | EN | Tensile strength MPa (ksi) |
Width mm (in.) |
Thickness mm (in.) |
|---|---|---|---|---|---|---|
| 9RU10 | S17700 | 631 | 1.4568 | 1200-1700 (174-247) |
2-360 (0.08-14.2) |
0.015-3 (0.0006-0.12) |
| 1RK95 | S45500 | - | - | 1050-1500 (152-218) |
10-330 (0.39-13.0) |
1-3.5 (0.039-0.138) |
| 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) |
| Grade | UNS | ASTM | EN | Tensile 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 our spring steel grades compared to the normally used ASTM 301.
The more plus signs, the better the properties:
| Property | + | ++ | +++ | ++++ | +++++ |
|---|---|---|---|---|---|
| Fatigue strength | - | - |
12R11 1RK95 |
9RU10 | 11R51 |
| Formability | - | - | 9RU10 | 1RK95 | Nanoflex |
| Non-magnetic | - | - | - | - | 13RM19 |
| Tensile strength (as delivered) |
- | - | 12R11 | - | 11R51 |
| Corrosion resistance | - |
12R11 9RU10 |
3R12 Nanoflex 11R51 |
Bioline 316LVM 2RK65 HV |
SAF 2507 Sanicro™ 75X |
| Relaxation resistance | - | 11R51 | 9RU10 | 1RK95 | Nanoflex |
| Elevated temperature | - | - | 11R51 |
Nanoflex 1RK95 9RU10 |
Sanicro™ 75X |
Sizes
Sizes and tolerances
Our spring steel program covers the size ranges below. Standard dimensional tolerances are according to the standard EN 10088-1.
Our 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
Our 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 | 12R11 | 11R51 | 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
Our 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
- Compression springs
- Tension springs
- Torsion springs
