Taps and Dies

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Taps and Dies
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Where you might find screw threads
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Where you might find screw threads
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More
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Outside threads

• e.g. Bolts

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A Split Circular Die is used to form an outside
thread
Teeth which cut threads
Split which opens and closes
The die is held in a die stock
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For the first cut
the centre screw is tightened, and the other 2
are left loose. This forces the split open.
Tight
Loose
Loose
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For the second cut
the centre screw is loosened, and the other 2
are tightened up. This forces the split shut.
Loose
Tight
Tight
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Inside threads

• e.g. Nuts

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2 Intermediate Tap
3 Plug Tap
1 Taper Tap
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Tap shown here held in the tap wrench.
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½ turn clockwise to cut the thread ¼ turn
anti-clockwise to clear out the cuttings.