ZEN-B8NC32 (ZENBMRUN8J) | Spiral Fluted Taps for Nickel Base 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 optimum thread relief is adopted in consideration of the shrinkage and cutting heat for Nickel Base Alloys.
• The ZEN-B has a flute design for nickel base alloy to smooth the discharge of chips.
• Optimum surface treatment is applied to prevent welding.
• Considering the shrinkage of the internal screw thread, the tap is produced to a moderate oversize condition.

Tapping Data

Tapping Conditions [M6×1]

Work Piece Material	Hastelloy Ｃ-276
Bored Hole Size	φ5.0
Tapping Length 25mm	10mm
Tapping Speed	5m/min
Machinery Type	CNC tapping center
Tapping Fluid	Water soluble cutting fluid

Characteristics of nickel base alloys

• Nickel based alloys have much better corrosion and heat resistance than steel. In general, nickel based alloys are much more
  difficult to process than steels and stainless steels. Nickel based alloys include A286, inconels, hastelloys, waspaloys and more.There are many kinds of nickel based alloys, but one of the more difficult ones to cut is inconel 718.

Types of tapping problems

• Nickel based alloys have high temperature strength and the thermal diffusivity is small so, abrupt abrasion occurs on the tap.
• The material tends to spring back so, internal threads may shrink or the tap may be crimped causing breakage.
• The material tends to cause welding on the cutting chamfer and the thread flank surface. The finished surface of the internal
  screw thread can become rough.