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| Material Designation | Standard | Same grade, different standards. | Source factory |
|---|---|---|---|
| SUP 6 | JIS G 4801-2005
Spring Steel |
NSSC | |
| SUP10 | JIS G 4801-2005
Spring Steel |
NSSC | |
| SUP9A | JIS G 4801-2005
Spring Steel |
||
| SUP13 | JIS G 4801-2005
Spring Steel |
||
| SUP12 | JIS G 4801-2005
Spring Steel |
||
| SUP9 | JIS G 4801-2005
Spring Steel |
||
| SUP11A | JIS G 4801-2005
Spring Steel |
POSCO | |
| SUP 7 | JIS G 4801-2005
Spring Steel |