Surface Coatings

Coated threading tools provide longer tool life time and allow a significant increase in cutting data. Due to the hard material coating, the wear resistance of the tap is considerably increased. The formation of cold welds and built-up edges is prevented. Due to the greatly reduced friction and the improved sliding behaviour of the coated tools, the cutting forces are reduced, the wear of the cutting edge is decreased and the surface quality of the cut threads is significantly improved. 

TiN (titanium nitride)

Monolayer coating

Colour: golden yellow 

Microhardness: 2.300 HV 

Temperature resistance: up to 600 °C

Heat conductivity: 0.07 kW/mK

coefficient of friction: 0,4

Layer thickness: 1.5 - 3 μm 

The TiN coating is particularly recommended for soft to tough steels, cast iron and many non-ferrous metals. As a cost-effective all-round coating, TiN offers a wide range of applications. Another advantage: TiN tools can be recoated up to five times without the need for prior decoating.

TiN+ (titanium nitride + sliding layer)

Two-layer multilayer coating

Colour: dark grey

Microhardness: 3000 HV

Temperature resistance: up to 500 °C

Thermal conductivity: 0.07 kW/mK

coefficient of friction: 0,15 - 0,20

Layer thickness: 2 - 4 μm 


The TiN+ coating is a combination of the TiN hard material layer and an overlying sliding surface layer. TiN+ increases tool life and improves chip flow. TiN+ is recommended in CNC machining, especially for soft to tough steels up to 1200 N/mm2, VA steels up to 1100 N/mm2 and many non-ferrous metals such as copper, brass, bronze and pure titanium.

Disadvantage: TiN+ tools must be decoated before recoating.

TiCN (Titancarbonitrid)

Multilayer graded coating

Colour: grey violet / blue grey

Microhardness: 3.000 HV

Temperature resistance: up to 400 °C

Thermal conductivity: 0.10 kW/mK

coefficient of friction: 0,3

Layer thickness: 4 - 7 μm 

The TiCN coating offers significant advantages for high-strength steels, abrasive materials (such as GG, high-strength aluminium alloys) and also for interrupted cuts, as the coating is relatively insensitive to impact loads. If TiN is not sufficient and increased demands are made on hardness and toughness, TiCN is used. Due to the reduced heat resistance, however, intensive cooling of the TiCN-coated tools is important.

TiAlN (Titanaluminiumnitrid)

Nanostructured coating

Colour: black-violet / violet-grey

Microhardness: 3.300 HV

Temperature resistance: up to 900 °C

Thermal conductivity: 0.05 kW/mK

coefficient of friction: 0,25

Layer thickness: 1.5 - 3 μm 


The TiAlN coating exhibits increased chemical stability and heat resistance and is therefore suitable for performance-enhancing applications where high temperature loads, limited cooling possibilities (such as small dimensions and deep bore holes) and increased cutting speeds (over 60 m/min) are involved. TiAlN also offers advantages in abrasive and difficult to machine materials and - with restrictions - also in dry machining. TiAlN tools can be recoated - up to five times without prior decoating. The TiAlN coating is also available in TiAlN-FUTURA and TiAlN+WC/C.

X.TREME (TiAlN-TiN-Basic)

Multilayer Coating

Colour: red violet

Microhardness: 3.600 HV

Temperature resistance: up to 800 °C

Thermal conductivity: 0.05 kW/mK

coefficient of friction: 0,3

Layer thickness: 3 - 4 μm 


The multilayer X.TREME coating combines the advantages of TiN, TiCN and TiAlN, offers two to three times higher performance compared to TiN and, as an all-round coating with improved thermal insulation and high toughness, can be used almost universally - also and especially for MQL applications and HSC machining. We offer the X.TREME coating primarily for our solid carbide thread milling cutters.

Combination layer (TiAlN + soft material sliding layer)

Multilayer lamellar coating

Colour: dark grey

Microhardness: 3000 HV

Temperature resistance: up to 800°

coefficient of friction: 0,15 - 0,20

Layer thickness: 2 - 3 μm


The combination of hard and soft material layers is best suited for dry machining. Extremely hard and temperature-resistant TiAlN-X on the cutting edges and a special sliding layer with minimum friction coefficients result in enormous wear resistance and reliable chip flow. The result is a significant increase in performance for ductile and high-strength materials, thread cutting at high cutting speeds (HSC), dry machining of steel and AlSi alloys and the use of minimum quantity lubrication (MQL). Our tap type ECO is supplied with combination coating.

CrN (chrome nitride)

Monolayer coating

Colour: silver grey 
Microhardness: 1.800 HV 
Temperature resistance: up to 700 °C 
coefficient of friction: 0,3 

The CrN coating is superior to the TiN and TiCN coating in terms of thermal stability and corrosion resistance. It offers favourable coefficients of friction and high abrasion resistance and toughness. As a replacement for the hard chromium plated surface, the CrN coating is suitable for machining copper, copper alloys, titanium alloys and long-chipping aluminium without Si content.



The nitration causes an increase in surface hardness (1,100 - 1,200 HV at a nitriding depth of 0.02 - 0.03 mm) and a significant improvement in wear resistance and sliding properties. However, with fine pitches (< 0.5 mm) there is a risk of embrittlement of the thread teeth. The nitrided surface is recommended for materials that are subject to heavy wear, such as grey cast iron, steels with a higher perlite content, titanium alloys, AlSi alloys with a high Si content (> 10%), bakelite and other thermosets.


Steam tempering

Vaporization produces a crystalline iron oxide layer 0.003 to 0.010 mm deep, which reduces the sliding resistance and direct friction between the tap and the workpiece and gives the cutting oil better adhesion. This largely eliminates the risk of built-up edges and cold welding ("sticking" of chip particles), for example on low-carbon steels. Vaporizing is only suitable for machining ferrous materials.


Nitrided and steam treated

Calduration is a combination of nitriding and steam tempering and combines the advantages of both surface treatments. Caldurized taps are recommended when machining materials that are both tough and wear resistant. We use the caldurized surface mainly for our all-round tap type POLY.

Hard chrome plating 


Hard chrome plating (HCr) improves the sliding properties by reducing the surface roughness of the tap. The hard chromium layer of approx. 0.005 mm thickness applied by electrolytic deposition has a hardness of 1,000 to 1,200 HV. Hard chromium plating is recommended for materials with low strength, especially copper and Cu alloys. However, the advantages of reduced friction and the resulting reduced cutting forces are lost again at a cutting temperature of over 250 °C.

TN2 = TIALN (titanium aluminium nitride) + TIN (titanium nitride)

Two-layer multilayer coating

Colour: gold

Microhardness: 3.500 HV

Temperature resistance: up to 800 °C

coefficient of friction: 0,3 


The TN2 coating is characterized by very good abrasion resistance, high thermal resistance and low coefficient of friction. By reducing friction, the tool life is considerably extended and the quality of the machined surface is improved. By combining the extremely hard TiAIN coating with the malleable TiN coating, we have an intelligent, self-regulating structure of the tool surface that adapts to the stresses caused by processing, thus improving the tool's resistance to breakage. TN2 is particularly suitable for tools for machining steels (Rm < 1000 MPa), stainless steels, cast iron and non-ferrous metals.

TC = TIN (titanium nitride) + TiCN (titanium carbonitride)

Multilayer coating

Colour: anthracite 
Microhardness: 3,700 HV 
Temperature resistance: up to 400 °C 
coefficient of friction: 0,2 

TC is a multi-layer, commonly used coating, which is characterized by very high hardness, good durability and a low coefficient of friction. The TiN base layer offers high adhesion to a tool and considerable resistance to dynamic loads. The upper TiCN/TiC layer with its high hardness and low coefficient of friction ensures very good resistance to abrasion. The combination of the above mentioned properties allows to protect the edges from material deposits and chipping. Due to the relatively low temperature resistance, proper cooling of the tool should be applied. The coating is mainly used for tools for machining steels (especially with high strength Rm > 1000 MPa), cast iron, non-ferrous metals and hardened materials.

HL = TIALN + WC (Tungsten carbide / Hardlube) 

Multilayer coating

Colour: dark grey

Microhardness: 3.000 HV

Temperature resistance: up to 800 °C

coefficient of friction: 0,15 


The high-performance properties of the HL coating were achieved by applying the advanced nanocomposite structure. The TiAIN coating with its high hardness and temperature resistance provides a stable, abrasion-resistant base for the coating. The upper WC/C layer consists of tungsten carbide nanocrystallites surrounded by a carbon layer and has excellent tribological properties. Hard WC separations provide abrasion resistance while maintaining the excellent sliding properties of carbon. By combining the advantages of two layers, the HL coating is ideal for machining a wide range of materials, improving chip evacuation, reducing cutting forces and protecting cutting edges from the effects of high temperatures. HL coated tools can operate with minimum lubrication. The coating is suitable for machining steels, stainless steels, cast iron, non-ferrous metals, superalloys and titanium.

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