Screw parts

We can manufacture to your specifications and applications
Screw parts made of tungsten or molybdenum, which have high specific gravity and high temperature deformation resistance, are widely used as structural components for equipment in environments where shielding is required or high temperature environments are encountered. We promise to provide high-precision products according to customer specifications. Please click on the inquiry link below to request the desired shape.

Applications

Assembly parts in environments requiring shielding or high temperature resistance

Tungsten rods for screw parts

スクロールで表全体をご覧いただけます。

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 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

スクロールで表全体をご覧いただけます。

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

スクロールで表全体をご覧いただけます。

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.

Molybdenum rods for screw parts

スクロールで表全体をご覧いただけます。

Materials Applications Non-sag Shock
resistance		 Machinability Abrasion
resistance
MOP Structural, Heaters, Bolts, Nuts Average Good Excellent Excellent
MOS Grid, Mandrels, Anchors Good Good Excellent Good
TEM Supports, Heaters, bolts, Nuts, Supporting shafts for X-ray tubes Excellent Excellent Excellent Good

Standard specifications of molybdenum rods

スクロールで表全体をご覧いただけます。

Diameter range
(mm)		 Materials Representative spec
MOP MOS TEM Finish Tolerance
diameter
(mm)		 Finish
grinding※1		 Tolerance
diameter
(mm)
Black Electropolishing Acid cleaning
0.02～0.19       ✓ ✓   ±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 ✓  
1.0～1.4 ✓ ✓ ✓ ✓ ✓   ±0.05 ✓ ±0.02
1.5～1.9 ✓ ✓ ✓ ✓   ✓ ±0.05 ✓ ±0.02
2.0～2.9 ✓ ✓ ✓ ✓   ✓ ±0.05 ✓ ±0.03
3.0～3.9 ✓ ✓ ✓ ✓   ✓ ±0.15 ✓ ±0.03
4.0～4.5 ✓ ✓ ✓ ✓   ✓ ±0.15 ✓ ±0.03
4.6～4.9 ✓   ✓ ✓   ✓ ±0.15 ✓ ±0.03
5.0～6.3 ✓   ✓ ✓   ✓ ±0.2 ✓ ±0.05
6.4～8.5 ✓   ✓ ✓   ✓ ±0.25 ✓ ±0.05
8.6～11.9 ✓   ✓     ✓ ±0.3 ✓ ±0.05
12.0～14.9 ✓   ✓     ✓ ±0.4 ✓ ±0.1
15.0～21.9 ✓   ✓     ✓ ±0.5 ✓ ±0.15
22.0～25.9 ✓   ✓     ✓ ±0.6 ✓ ±0.15
26.0～27.9 ✓   ✓     ✓ ±0.7 ✓ ±0.2
28.0～50.0 ✓         ✓ ±1.0 ✓ ±0.2

※1　Finish grinding: Centerless grinding for diameters less than D30mm, machined belter grinding for diameters D30mm and larger
※2　For products with a diameter of 50 mm or more, please contact us.

Purity of molybdenum wires and rods

Materials Purity（%）
MOP、MOS 99.95 min.
TEM 99.00 min.
Tungsten technical information
Molybdenum technical information