 | Dies are used for external threading. Manual threading is the most usual method although machine threading is sometimes used for simple tasks.
A solid die usually cuts more accurately than a split die. However, dies which are supplied solid may be split |
 | | Chromium Steel Tools |
 | Thread cutting tools made from chromium steel are especially suited for manual threading. Chromium steels have a lower red hardness than high speed steels. This means that under comparable machining conditions, they will have less wear resistance than high speed steels. |
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| General Hints on the use of Dies and Dienuts |
 | Before starting the Die or Dienut, chamfer the end of the bar at an angle of 45 degrees to eliminate sudden loading of the leading edges. Ensure the Die or Dienut is presented to the bolt squarely. |
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 | Make use of the large tolerances associated with the Major Diameter of the bolt, by reducing the diameter of the bar (see chart). This will reduce the cutting force to a minimum. |
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 | Use the Gun Nose type of die, type F100 or similar, as this ensures the swarf is directed away from the cutting area. |
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 | Ensure a good supply of the correct lubricant is aimed at the cutting area. |
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 | When adjusting split Dies, avoid opening out as this will cause rubbing. Split dies may be closed down by approxi-mately 0.15mm, by turning the adjustment screws equally. Pressure on one side of the Die only may cause breakage. |
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 | Generally speaking, Dienuts are used for reclaiming or cleaning out existing threads by hand. They tend to be of a more robust construction and should only be used in exceptional circumstances to cut a thread from solid. |
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