Determining your Percent of Thread
| Material | Deep Hole Tapping | Average Commercial Work | Thin Sheet Stock or Stamping | |
| Free Cutting | Aluminum Brass Bronze Cast Iron Copper Mild Steel Tool Steel | 60%-70% | 65%-70% | 75%-85% |
| Hard or Tough | Cast Steel Drop Forging Monel Metal Nickel Steel Stainless Steel | 55%-65% | 60%-70% |
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