ZET-B Metric Threads | Spiral Fluted Taps for Titanium Alloys | YAMAWA

Product Features

• The tap is produced from a high grade powder high speed steel that is excellent for heat resistance and wear resistance.
• The cutting edge geometry helps prevent material shrinkage. The the spiral flute design helps pull the chips ou of the hole to
  allow the cutting heat to be carried out.
• Appropriate flute shape for titanium alloy is utilized and the ejection of the chips is smooth.
• A nitride surface treatment is performed for added wear resistance
• Considering the shrinkage of the internal screw thread, the tap is produced to a moderate oversize condition.

Tapping Data

Tapping conditions [Ｍ12×１.75]

Work Piece Material	Ti-6Aℓ-4V
Bored Hole Size	φ5.0
Tapping Length 25mm	12mm
Tapping Speed	8m/min
Machinery Type	CNC tapping center
Tapping Fluid	Water soluble cutting fluid

Characteristics of titanium alloy

It is mainly composed of titanium that has a high strength and is light weight. It has excellent heat resistance. There are various
types of titanium alloys such as Ti - 5Aℓ - 2.5Sn, Ti - 5Ta, and the most popular Ti - 6Aℓ - 4V which is commonly used due to its
good characteristics.

Examples of problems in tapping

• Titanium alloys have high temperature strength and the thermal diffusion is small, so abrupt abrasion occurs on the tap.
• The spring back on internal screw threads may cause diameters to shrink and the tap may be crimped causing breakage.
• Chip welding occurs easily on the cutting chamfer of the tap and the threads flank surface. The finished thread surface of the
  internal screw thread also becomes rough and coarse.