Rotagrip Ltd   M7 x 1 HSS Spiral Flute Tap (photo is of another size; proportions may vary)   Description   • Spiral flute taps are used to produce a thread close to the bottom of a blind hole and therefore have a very short lead.
• The right hand spiral cut of the flutes acts to force the swarf away from the cutting teeth to the rear of the flutes and out of the hole.
• They are better on materials which form long continuous stringy swarf, rather than chips.
• They are also better to tap a thread in a hole where there is a break in the material, e.g. another hole, as the spiral fluting helps the tap to pick up on the other side.
• Spiral flute taps can have slow or fast helix angles.
• Slow spirals are used for non ferrous materials, and fast spirals for most other materials.
• We supply fast spiral as standard.