Screw parts

We can manufacture products to your specifications and applications.
Screw parts made of tungsten or molybdenum, recognized for their high specific gravity and resistance to high-temperature deformation, are extensively utilized as structural components in equipment designed for shielding or high-temperature environments. We are committed to delivering high-precision products tailored to customer specifications. Please click on the inquiry link for further details.

Applications

Assembly parts for 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。

Type 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
LW Structural materials, discharge electrodes, Good Excellent Excellent Good Good Good Average

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)
More than - Less than		 Type Finish Tolerance
diameter
(mm)		 Finish
grinding
*1		 Tolerance
diameter
(mm)
AW AX EX CY
PFW		 4N-W
5N-W		 EP
KT		 LW Drawn,
Swaged		 Electrolytic
Polished		 Chemical
Cleaned
～0.15 ✓             ✓ ✓   ±0.005    
0.15～0.20   ✓           ✓ ✓   ±0.005    
0.20～0.40   ✓ ✓ ✓ ✓     ✓ ✓   ±0.005    
0.40～0.50   ✓ ✓ ✓ ✓     ✓ ✓   ±0.01    
0.50～0.60   ✓ ✓ ✓ ✓     ✓ ✓   ±0.02    
0.60～0.80   ✓ ✓ ✓ ✓     ✓ ✓ ✓ ±0.03    
0.80～1.0   ✓ ✓ ✓ ✓     ✓   ✓ ±0.03 ✓ ±0.03
1.0～1.3     ✓ ✓ ✓     ✓   ✓ ±0.03 ✓ ±0.03
1.3～3.0     ✓ ✓ ✓     ✓   ✓ ±0.05 ✓ ±0.03
3.0～5.0     ✓ ✓ ✓   ✓ ✓   ✓ ±0.15 ✓ ±0.03
5.0～6.4     ✓ ✓ ✓   ✓ ✓   ✓ ±0.2 ✓ ±0.05
6.4～8.6     ✓ ✓ ✓   ✓ ✓   ✓ ±0.25 ✓ ±0.1
8.6～12.0     ✓ ✓ ✓   ✓     ✓ ±0.3 ✓ ±0.1
12.0～15.0     ✓ ✓ ✓   ✓     ✓ ±0.4 ✓ ±0.1
15.0～18.0     ✓ ✓ ✓ ✓ ✓     ✓ ±0.5 ✓ ±0.15
18.0～(40.0)       ✓ ✓ ✓ ✓     ✓ ±1.0 ✓ ±0.2

*1 Finish grinding: Centerless grinding for diameters less than 30 mm, and cutting-belt grinding for diameters of 30 mm and larger.

Manufacturable range and standard tolerances for Tungsten rod lengths

スクロールで表全体をご覧いただけます。

Diameter (mm) Standard length (tolerance) :mm Max length (tolerance) :mm
5 1,000 (+10/0) 11,000 (±50)
6 1,000 (+10/0) 7,500 (±50)
8 1,100 (+10/0) 4,000 (±50)
11 1,000 (+10/0) 3,000 (±50)
16 1,200 (+10/0) 1,500 (±50)
21 1,100 (+10/0) 1,500 (+10/0)
25 850 (+5/0) 1,500 (+10/0)
31 700 (+5/0) 1,400 (+10/0)
36 500 (+5/0) 1,000 (+10/0)
41 400 (+4/0) 800 (+5/0)
45 300 (+4/0) 600 (+5/0)
50 230 (+3/0) 450 (+4/0)

please contact us for dimensions other than those mentioned above.

Purity of Tungsten rods

Type Purity（%）
AW, AX, EX, CY, EP, KT 99.95 min.
DW 99.00 min.
LW 97.00 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。

Type 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
TT-TEM™ Supports, Heaters, bolts, Nuts, Supporting shafts for X-ray tubes Excellent Excellent Excellent Good
TZM Forging tools, Furnace components Good Excellent Excellent Excellent

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)
More than - Less than		 Type Finish Tolerance
diameter
(mm)		 Finish
grinding *1		 Tolerance
diameter
(mm)
MOP MOS TT-TEM™ TZM Drawn,
Swaged		 Electrolytic
polished		 Chemical
cleaned
0.02～0.20   ✓     ✓ ✓   ±0.005    
0.20～0.40 ✓ ✓ ✓   ✓ ✓   ±0.005    
0.40～0.50 ✓ ✓ ✓   ✓ ✓   ±0.01    
0.50～0.60 ✓ ✓ ✓   ✓ ✓   ±0.02    
0.60～0.80 ✓ ✓ ✓   ✓ ✓   ±0.03    
0.80～1.0 ✓ ✓ ✓   ✓ ✓   ±0.03 ✓  
1.0～1.5 ✓ ✓ ✓   ✓ ✓   ±0.05 ✓ ±0.02
1.5～2.0 ✓ ✓ ✓   ✓   ✓ ±0.05 ✓ ±0.02
2.0～3.0 ✓ ✓ ✓   ✓   ✓ ±0.05 ✓ ±0.03
3.0～4.0 ✓ ✓ ✓   ✓   ✓ ±0.15 ✓ ±0.03
4.0～4.6 ✓ ✓ ✓   ✓   ✓ ±0.15 ✓ ±0.03
4.6～5.0 ✓   ✓   ✓   ✓ ±0.15 ✓ ±0.03
5.0～6.4 ✓   ✓   ✓   ✓ ±0.2 ✓ ±0.05
6.4～8.6 ✓   ✓   ✓   ✓ ±0.25 ✓ ±0.05
8.6～12.0 ✓   ✓       ✓ ±0.3 ✓ ±0.05
12.0～15.0 ✓   ✓       ✓ ±0.4 ✓ ±0.1
15.0～22.0 ✓   ✓       ✓ ±0.5 ✓ ±0.15
22.0～26.0 ✓   ✓ ✓     ✓ ±0.6 ✓ ±0.15
26.0～28.0 ✓   ✓ ✓     ✓ ±0.7 ✓ ±0.2
28.0～50.0 ✓   ✓ ✓     ✓ ±1.0 ✓ ±0.2

*1 Finish grinding: Centerless grinding for diameters less than 30 mm. and cutting-belt grinding for diameters of 30 mm and larger.
*2 For products with a diameter of 50 mm or greater, please contact us.

Purity of molybdenum wires and rods

Type Purity（%）
MOP、MOS 99.95 min.
TT-TEM™, TZM 99.00 min.
Tungsten technical information
Molybdenum technical information