Tungsten rods

For lighting, electrodes, and high-temperature furnace components
We can provide tungsten wires as well as tungsten rods. Taking advantage of its feature of having the highest melting point among metals, tungsten wires are used for lighting, electrodes, high-temperature furnace parts, probe pins, etc. Various wire diameters, materials, and finishes are available to meet your needs. We also offer tungsten rods of the world's highest level of purity through strict control of raw materials and processes, taking advantage of our integrated production from raw materials.

Applications Lighting, Electrodes, High-temperature furnace components, Probe pins, etc.

Materials guide

AW It has excellent resistance to high temperature deformation, blackening, and shock resistance, and has a long service life due to the low content of impurity gases.
AX Compared to conventional materials, the recrystallization temperature is 50 to 200℃ higher, doped pores are smaller, and the length of the crystal structure after recrystallization is 3 to 4 times longer, significantly improving nonsagging properties.
EX It contains few impurity gases, has excellent resistance to high-temperature deformation and corrosion against deposited metals such as Al, Ni, and Cr, and has a long service life, making it one of the world's first-class filament materials.
DW Long-life tungsten that facilitates thermal electron generation and prevents grain larged and grain boundary cracking at the temperature of thermal electron emission. Coil processing, tip processing, and assembly processing are also available upon request.
CY（PFW） The most common pure tungsten material. It has good workability, excellent corrosion resistance, and low impurity gas content.
EP, KT The fine dispersion of crystal grains can significantly reduce the resistance to discharge consumption.
4N-W Tungsten with reduced impurities and purity of 99.99% or higher.

5N-W		 This is the world's highest purity tungsten with a purity of 99.999% or higher, with impurities reduced to the utmost limit. It is used for electrodes for various discharge lamps and in cutting-edge technological fields where minimum amounts of impurities are not acceptable.

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Materials Applications Non-sag Shock
resistance		 Machinability Dischargeability Discharge consumption resistance Abrasion resistance Corrosion resistance (VM)
AW Filaments for halogen lamps, Grids, Supports, Heaters, Electrified wires Excellent Good Good Average Good Good Average
AX Filaments for ultra high temperature halogen lamps (for thick and medium wires) Excellent Excellent Excellent Average Good Good Average
EX Vacuum deposition, High-temperature furnace heaters, Printer printing wires, Supports, Discharge electrodes, Probe pins Good Good Excellent Average Excellent Excellent Excellent
DW Electrodes, charged wire thermal electron emission filaments Good Excellent Excellent Excellent Excellent Good Average
CY
（PFW）		 Structural and furnace heaters Average Average Excellent Average Average Good Excellent
EP Discharge electrodes, Structural materials,

welding

 Welding electrodes		 Good Average Excellent Average Excellent Excellent Average
KT Discharge electrodes, Structural materials Good Average Excellent Average Excellent Excellent Average
4N-W
5N-W		 Electrodes, Heaters Average Average Excellent Average Good Excellent Good

Standard specifications of tungsten rods

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Diameter range
(mm)		 Materials Representative spec
AW AX CY
PFW		 4N-W
5N-W		 EX EP
KT		 Finish Tolerance diameter
(mm)		 Finishing
polishing
※1		 Tolerance
diameter
(mm)
Black Electropolishing CC
0.03～0.14 ✓           ✓ ✓   ±0.005    
0.15～0.19   ✓         ✓ ✓   ±0.005    
0.20～0.39   ✓ ✓ ✓ ✓   ✓ ✓   ±0.005    
0.40～0.49   ✓ ✓ ✓ ✓   ✓ ✓   ±0.01    
0.50～0.59   ✓ ✓ ✓ ✓   ✓ ✓   ±0.02    
0.60～0.79   ✓ ✓ ✓ ✓   ✓ ✓ ✓ ±0.03    
0.80～0.99   ✓ ✓ ✓ ✓   ✓   ✓ ±0.03 ✓ ±0.03
1.0～1.2     ✓ ✓ ✓   ✓   ✓ ±0.03 ✓ ±0.03
1.3～2.9     ✓ ✓ ✓   ✓   ✓ ±0.05 ✓ ±0.03
3.0～4.9     ✓ ✓ ✓   ✓   ✓ ±0.15 ✓ ±0.03
5.0～6.3     ✓ ✓ ✓   ✓   ✓ ±0.2 ✓ ±0.05
6.4～8.5     ✓ ✓ ✓   ✓   ✓ ±0.25 ✓ ±0.1
8.6～11.9     ✓ ✓ ✓       ✓ ±0.3 ✓ ±0.1
12.0～14.9     ✓ ✓ ✓       ✓ ±0.4 ✓ ±0.1
15.0～18.0     ✓ ✓ ✓ ✓     ✓ ±0.5 ✓ ±0.15
18.1～(40.0)     ✓ ✓   ✓     ✓ ±1.0 ✓ ±0.2

※1 Finish grinding: Centerless grinding for diameters less than D30mm, cutting belter grinding for diameters D30mm and larger.

Production range of lengths of standard tungsten rods

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Diameter (mm) 50 45 41 36 31 25 21 16 11 8 6 5
Length
(mm)		 MAX 450 600 800 1000 1400 1500 1500 2000 3300 8000 12000 17000
Standard 230 300 400 500 700 850 1100 1200 1000 1100 1000 1000

Purity of tungsten rods

Materials Purity（%）
AW, AX, EX, CY, EP, KT 99.95 min.
DW 99.20 min.
4N-W 99.99 min.
5N-W 99.999 min.
Tungsten technical information