Surface coating for machine taps and twist drills

Oberflächenbeschichtung bei Maschinengewindebohrern und Spiralbohrern

Surface treatment of taps: surface treatment and surface coating

A distinction is made between surface treatment and surface coating. We would like to introduce the difference to you in more detail.

Surface treatment process

Surface treatment includes the following processes:

  • Nitriding
  • Vaporize

Nitriding increases the surface hardness of the tap. Wear resistance increases and the sliding properties during cutting improve.

Vaporizing is a vapor treatment of the tap. Sliding resistance and friction are reduced and cold welding is avoided.

Seitenansicht: GSR Silverline Maschinengewindebohrer mit TiN Oberflächenbeschichtung eingespannt im Schraubstock

Surface coating process

Surface coating includes the following processes:

  • Titanium nitride process (TIN)
  • Titanium carbonitride layer (TiCN)
  • Titanium Aluminum Nitride Coating (TiAIN)

The titanium nitride (TIN) process has long been proven. The application is carried out according to the CVD process (chemical vapour deposition). High hardness, high adhesive strength and high toughness are the desired properties.

The titanium carbonitride layer (TiCN) has the following properties: very high hardness, very high adhesive strength and relatively high thermal conductivity.

The Titanium Aluminum Nitride Coating (TiAIN) is used for higher temperature loads and reduced cooling possibilities. It is very heat resistant.

Overview of coating variations

The following table gives you an overview of the essential characteristics of the individual coating variants:

Titanium nitride coating -> (TiN)
Aluminium Titanium Nitride coating -> (AlTiN)
Chrome aluminium coating -> (AlCro)


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