IS 319 Gr I, Free cutting brass, is a significantly improved form of 60/40 brass, with excellent free cutting properties. It is the Most Common Grade that uses for Mass Production.
| Elements | Min. | Max. |
| Cu | 56.00 | 59.00 |
| Pb | 2.00 | 3.50 |
| Fe | 0.35 | |
| Other | 0.70 | |
| Zn | Remain |
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