A.L.M.T. Corp.

Tungsten rods

For lighting, electrodes, and high-temperature furnace parts

Beyond tungsten wires – rods are also available.
These are used for lighting, electrodes, high-temperature furnace parts, probe pins, etc., with the characteristic, the highest melting point among metals. Customers can choose a variety of diameters, materials and finishing methodsfor various applications.
We also offer the world’s highest level high-purity tungsten rods by strictly controlling raw material and processes, taking advantage of our integrated production.

照明用をはじめ、電極、高温炉部材用として

Product selection guide

AW Excellent high-temperature deformation resistance, blackening resistance, shocking resistance, less impurity gas, and long life.
AX Compared with conventional materials, the recrystallization temperature is higher (50° to 200°C), dope hole is smaller, crystal structure after recrystallization is 3 to 4 times longer, and non-sagging performance is greatly improved.
EX World’s first grade filament material. It contains less impurity gas, excels in high temperature deformation resistance and corrosion resistance against evaporated metals including Al, Ni, Cr, and has long life.
DW Long lifetime tungsten that facilitates emission of thermo-electrons, and prevents grain growths and integranular fracture at the thermionic emission temperature. We respond to coil processing, tip processing, and assembly processing upon your request.
CY(PFW) The most common pure tungsten material with good workability, excellent corrosion resistance, and less impurity gas contained.
EP,KT Dramatically reduces discharge consumption resistance by dispersing crystal grains finely.
4N-W

5N-W
World’s highest grade high-purity tungsten
Purity 4N-W ≧99.99%  5N-W ≧99.999%

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Application Non-sag shock
resistance
Machinability Discharge
ability
Dischage
consumption
resistance
Wear
resistance
Corrosion
resistance
(VM)
AW Filament for halogen lamps (thinner), Grids, Supports, Heaters, and Corona wires
AX Filament for ultrahigh temperature halogen lamps (thicker)
EX Vacuum evaporation, Heaters for high-temperature furnaces, Print wires for printers, Supports, Discharge electrodes, Probe pins
DW Electrodes, EDM wires Filaments for thermionic emission  
CY
(PFW)
Structural materials and Heaters for furnaces
EP Discharge electrodes, structural materials, pressure welded electrode
KT Discharge electrodes, Structural materials
4N-W
5N-W
Electrodes, Heaters

Standard specifications of tungsten rods

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

*1 Finish grinding for rods : Equal or greater than φ30mm by belt grinding. Less than φ30mm by centerless grinding.

Manufacturing range of length of standard tungsten rods

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Diameter
(mm)
50 45 41 36 31 25 21 16 11 8 6 5
Length 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

Type W %
AW, AX, EX, CY, EP, KT 99.95min.
DW 99.20min.
4N-W 99.99min.
5N-W 99.999min.