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Wire Drawing Dies

Wire drawing is a metalworking process used to reduce the cross-section of a wire by pulling the wire through a single, or series of, drawing dies. There are many applications for wire drawing, including high, medium and low voltage cables, automotive, medical wire, superconducting, bonding, and welding wires. Although similar in process, drawing is different from extrusion, because in drawing the wire is pulled, rather than pushed, through the die. Drawing is usually performed at room temperature, thus classified as a cold working process, but it may be performed at elevated temperatures for large wires to reduce forces. The wire dies we could supply are TC drawing dies, PCD wire drawing dies, Nano drawing dies, Diamond wire drawing dies and other Customised Dies.

Drawing dies are typically made of tool steel, tungsten carbide, or diamond, with tungsten carbide and manufactured diamond being the most common. For drawing very fine wire a single crystal diamond die is used. For hot drawing, cast-steel dies are used. For steel wire drawing, a tungsten carbide die is used. The dies are placed in a steel casing, which backs the die and allows for easy die changes. Die angles usually range from 6–15°, and each die has at least 2 different angles: the entering angle and the approach angle.


High quality carbide drawing dies of every size and specification. Wire Dies are produced according customer requirements in terms of size, drawing angle, bearing length and tolerances.

We can supply the sintered tungsten carbide nibs ,dies with inner polished, fully finished cased , tube or pipe drawing dies and rod and bar Drawing Dies.

Tube, or pipe, drawing dies can be round, hex or square as well as any custom shapes desired. The process is similar to the wire drawing process.

Bars and Rods are drawn in a similar fashion to wire, only they tend to be much thicker. A wide variety of metals are used for this purpose, including many steel and copper alloys.
Dimension of drawing die

Case size(D * H)mm Nib size (D * H)mm Hole size mm Tolerance range mm
25*12 9*6 0.15~0.5 0~0.02
30*16 13*10 0.5~2.6 0~0.02
32*23 16*13 0.8~3.5 0~0.02
32*23 16*14 1.0~3.5 0~0.02
40*25 20*17 1.5~6.5 0~0.02
40*26 22*18 1.8~6.5 0~0.02
50*28 25*20 3.0~9.5 0~0.02
70*35 30*22 5.5~12.5 0~0.02
75*35 35*25 8.5~16.5 0~0.02
80*35 40*25 16.5~21.5 0~0.02
110*45 50*28 21.5~24.5 0~0.02
120*50 60*35 24.5~34.5 0~0.02
130*60 70*35 34.5~43.5 0~0.02
140*60 80*35 34.5~45.5 0~0.02
150*60 90*35 45.5~51.0 0~0.02
160*75 100*40 51.0~56.0 0~0.02
170*75 110*40 57.0~65.0 0~0.02
180*80 120*45 66.0~69.0 0~0.02
190*85 130*50 70.0~76.0 0~0.02

Polycrystalline Diamond (PCD) Dies for wire drawing that can be used for ferrous and non-ferrous wire drawing applications. Sizes are available for drawing applications ranging from ultra-fine wire to largely drawn rod,Hole Sizes:From 0.2500 mm to 14.0000 mm.

Drawing of polycrystalline diamond dies:
Drawing of polycrystalline diamond dies

Reduction Angles & Bearing Length of PCD Drawing Dies
Metal Wire Entrance Angle Reduction Angle Bearing length Back Relief Angle
Copper Wire 70°± 10° 16°-18° 30% ± 10 10°± 5°
Aluminium Wire 70°± 10° 18°-20° 25% ± 10 10°± 5°
Stainless Steel 60°± 10° 12°-14° 40% ± 10 10°± 5°
Brass Wire 60°± 10° 12°-14° 30% ± 10 10°± 5°
Solder Wire 70°± 10° 16°-18°° 30% ± 10 110°± 5°
GI Wire 60°± 10° 12-14° 40% ± 10 10°± 5°
Tolerance and Case of PCD Wire Drawing Dies
Diamter Tolerance Roundness Case
≤0.020 0.0006 0.0030 Ф25*6
0.020-0.050 0.0006 0.0030 Ф25*8
0.051-0.100 0.0010 0.0050 Ф25*8
0.101-0.200 0.0010 0.0050 Ф25*8
0.201-0.500 0.0015 0.0080 Ф25*8
0.501-1.000 0.0020 0.0010 Ф25*10
1.001-1.500 0.0025 0.0013 Ф25*12
1.501-2.200 0.0030 0.0015 Ф25*14
2.201-3.300 0.0040 0.0020 Ф28*16
3.302-4.600 0.0050 0.0025 Ф28*16
4.601-5.500 0.0060 0.0030 Ф43*26
5.501-8.00 0.0080 0.0040 Ф43*30

The nano-diamond composite coating drawing dies is based on cemented carbide (WC-Co) as the substrate, and chemical vapor deposition (CVD) is used to apply micro-level and nano-level diamond composite coating on the surface of the inner hole of the die. After precision grinding and polishing of the coating, a new mold is obtained.

The micro-nano composite coating on the surface of the inner hole not only has the characteristics of strong adhesion and good wear resistance of the micron diamond coating but also has the advantages of high surface finish of the nano-diamond coating, small friction coefficient, and easy grinding and polishing.

There is a huge amount of raw material and money to be saved or lost in the stranding and compacting operations of energy cable manufacture. Using Nano drawing dies equates to maximum operational savings and minimum loss of materials. Many cable manufacturers have found replacing tungsten carbide wire drawing dies with CVD coating drawing dies has resulted in significant raw material savings.

Example Compacting Profile Notes:
CVD Drawing Dies Example Compacting Profile Notes
Our product advantages:

  • Targeted pre-treatment process: make the coating and the substrate tightly combined
  • Bottom micron diamond coating: excellent wear resistance
  • Surface layer nanometer diamond coating: excellent surface finish and low friction coefficient
  • Computer simulation to optimize the hole design: make the force of the wire evenly
  • Life: drawn aluminum wire is more than 30 times that of tungsten carbide dies; drawn low carbon steel wire is more than 20 times of T.C drawing dies; drawn medium carbon steel wire is more than 30 times of carbide dies.
  • Aperture change when the mold is scrapped: 0.00 mm, free of drawing dies repair
  • The working surface has a high finish and is always the same
  • High dimensional accuracy
  • Reduce the number of shutdown inspections and drawing dies changes, and improve production efficiency
  • It saves raw materials, and the length of the metal wire produced is 1% to 2% longer than that produced by traditional drawing dies.
  • Improve product quality (because the working surface has high smoothness and high dimensional accuracy)
Natural monocrystalline diamond is the hardest known material, almost twice as hard as the cubic boron nitride. Approximately 6% of the rough natural diamond is suitable for the production of drawing die.

The diamonds are thoroughly inspected before they are flattened, then the same are inserted in a stainless steel case that is later mounted by a heating process. Our diamond dies are widely accepted for fine wire drawing.

ND dies enable long drawing die life with long lasting dimensional tolerances, even for high demanding applications. UKO ND drawing dies are manufactured with a mirror polish and a smooth wire entry to ensure optimal die life and string-up.

Standard Casing Size for ND Dies are 25mm x 8mm or 25mm x 10mm,diamond dies from a size range of 0.050mm to 1.000mm.

Natural Diamond Drawing Dies (ND):

Die Sizes Production in Metric Tons (MT)
0.4448, 0.3954, 0.3522, 0.32021 45/50 MT each die
0.2914, 0.2646, 0.2957, 0.286 45/50 MT each die
0.2406, 0.2241, 0.2046 45/50 MT each die
0.187 45/50 MT each die

Suitable Drawing for Your Usage:

mm Inches ND drawing dies PCD drawing dies TC drawing dies
0.012-0.049 0.0005-0.0019
0.050-0.099 0.0019-0.0039
0.100-0.599 0.0039-0.0236
0.600-2.099 0.0236-0.0826
2.1-15.9 0.0827-0.6260
16.0-35.0 0.6260-1.3780

All shaped profile dies are custom made to your specific requirements out of extremely high wear-resistant tungsten carbide material.

Wire Shapes:Square,Rectangular,Triangular,Flat,Oval,Half round,Hexagonal,also we could supply tungsten carbide groove dies and sprial groove dies for concrete nails.

Tungsten carbide wire guides bushes and wire guide dies for straightening machines and electrodes nozzles of various grades and sizes, Material supplied rough or finished and polished.

Our technicians will guide you towards the dies suited to your various usage.

Size of tungsten carbide wire guide dies:
Size of tungsten carbide wire guide dies

Dimension (mm) R
D(mm) H (mm) d(mm)
8.0 15.0 3.0 7.0
13.0 10.0