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Esteves Group - The global die company

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Diamond dies - Natural diamond wire dies (ND dies)


Esteves Group is a manufacturer of diamond drawing dies with natural diamond (ND) blanks inside as a high quality, predictable and durable product for drawing ferrous and non-ferrous wires 0.007 to 2.00 mm (.00019-.0787"). Larger sizes are available by request.

Like all products from Esteves Group you can expect these products to be manufactured with the highest quality and accuracy standards.

Natural diamonds, abbreviated as ND, are naturally formed within the earth at high pressure high-temperature conditions. Because of its extremely rigid lattice, it can be contaminated by a few types of impurities such as boron and nitrogen.

The ND blanks that Esteves Group use are all selected for purity and limited inclusions, flattened on a special lapping machine, and sorted in different groups of height and diameter combinations.


Key benefits of Esteves Group ND diamond wire dies

Long die life due to its extreme hardness and resistance to scratching
Can be used in high-heat processes because of its extreme thermal conductivity
Blanks are thermally stable up to 1700°C (3092°F)
Easy setup, smooth drawing
100% of all diamonds are checked for inclusions, cracks
Nonconductive properties make this product a good choice when electrical conductive materials are an issue



Natural diamond has been used as a raw material for drawing dies for over 100 years. These natural diamond dies were the first types of drawing dies that were manufactured by Esteves Group.

SSCD and PCD blanks were invented in recent decades and are gradually replacing natural diamond dies in some applications.

Natural diamond dies are still successfully used for applications that require excellent wire surface qualities, high heat resistance and in applications that require a die material that is not electrically conductive.

Typical application areas:
Tungsten filament wire
Bonding wire (gold, copper, aluminum)
Medical wire
Stainless steel wire
Copper wire
EDM wire
Special alloy and high performance alloy wire
Precious metal wire
Various other ferrous and non-ferrous metal wire types


Product use

Natural diamond can be chosen as a raw material for the following products from Esteves Group:

Wire drawing dies
Shaped wire drawing dies
Bunching/Stranding dies
Extrusion tools
Compacting dies
Refurbishing/recutting drawing dies
Burnishing dies


Size range

Natural diamond wire dies (ND dies) are part of Esteves Group’s diamond wire dies product portfolio. Typical ranges (both smaller and larger sizes are available on request):

0.007 to 2.00 mm (.00027 - .0787”) - natural diamond wire dies (ND dies)
0.010 to 2.05 mm (.00039 - .0807”) - synthetic single crystal diamond wire dies (SSCD dies)
0.040 to 35.0 mm (.00157 - 1.378”) - polycrystalline diamond wire dies (PCD dies)
0.127 to 76.2 mm (.005 - 3.000”) - tungsten carbide wire dies (T/C dies)

Technical support

Call our technical sales support if you wish to receive more information about our products or if you would like to receive a quote for your application. We will manufacture wire dies to standard specifications or customize our products to match your manufacturing needs.



All our manufacturing facilities manufacture new wire drawing dies.
All our manufacturing facilities refurbish (recut/rework) wire drawing dies.
Al our manufacturing facilities manufacture multi-wire die sets.
Our free eWizard handbook presents an overview of dies and their use in the wire and cable industry. We hope you will find this handbook useful in the course of your business activities.
Esteves Group also gives their customers a unique free software program that can be used to configure and visualize drawing dies. Drawing Die Wizard is a great tool to select the best and most cost effective blank for any wire drawing situation.


ND Dies Download product leaflet (USA-only) Download product leaflet (metric)

Natural diamond (ND)
Carbon in a tetrahedral atomic crystallization lattice

Physical properties
Hardness 88-118 GPa
Thermal conductivity 800-2300 W/mK
Transverse rupture strength 2.0 GPa

How to order new dies

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