• also known as taper taps
• 4 thread chamfer
• made undersize to reduce the load on finishing taps
• used for difficult tapping operations and for starting tapping operations on difficult
holes
• also known as intermediate taps • 4 thread chamfer • used for hand or machine tapping in through holes and blind holes where ample chip clearance is available • lead chamfer permits easier starting and requires less tapping torque than bottoming taps
• also known as plug taps
• 2 thread chamfer
• used for tapping blind holes where a maximum number of fully-formed threads are
needed in minimum depth holes
HeliCoil / ArmaCoil Screw Thread Insert Taps
Roughing Tap
Finishing Tap
Bottoming Tap
• 2 thread chamfer
• can be used manually or attached to tapping drivers
• specially designed for efficient removal of stringy chips out of deep or blind holes in
soft materials (eg. aluminium)
• spiral flutes aid in directing the swarf backwards out of the hole
Spiral Point Tap (Machine Tap)
Spiral Flute Tap (Machine Tap)
• 2 thread chamfer
• similar to spiral flute taps except that they are more suitable for through holes on less
abrasive materials
• spiral point taps incorporate an angular grind at the point end of the tap which
shears chips and drives the swarf forward of the tap
• used widely in long through holes and blind holes with ample chip clearance
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