MOST COMMON FLAT SPRING MATERIAL TYPES |
TYPE | DESCRIPTION |
| Carbon |  |
1060 | - Lowest grade carbon spring steel
- Sometimes hard rolled rather than hardened and tempered |
1075 | - Common carbon spring steel
- Thickness from .004 to .125" (.1 to 3.2 mm) |
1095 | - Higher tensile strength & better cycle life
- Thickness from .004 to .125" (.1 to 3.2 mm)
- Better for prestressed springs |
TRC | - Highest tensile strength but lower cycle life due to slit edge (very sharp square edge)
- Thickness from .004 to .030" (.1 to .76 mm)
- Best for prestressed springs |
| Stainless | |
301 | - Common stainless spring steel
- Thickness from .004 to .060" (.1 to 1.5 mm) |
| - Sandvik grade 301 stainless spring steel
- Thickness from .004 to .060" (.1 to 1.5 mm)
- Typically slightly better characteristics than normal 301 |
| - Sandvik proprietary grade stainless spring steel
- Thickness from .004 to .030" (.1 to .76 mm)
- Best spring steel for combination of highest tensile strength and best corrosion resistance |
17-7 PH | - Common stainless flat wire for hair springs
- Thickness from .035-.054" (.9 to 1.4 mm) |
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