We manufacture pure tungsten cap screws in various sizes. Click image below for details.
Advantages of working with us
A Million Piece per Month Production Capacity

From 100 to 1 million units per month

Difficult-to-Cut
Materials

Tungsten, Hastelloy Platinum, Nickel

High-Precision
Machining

Tightest Tolerances: ±0.003mm(0.00011in)
For over 70 years, Koyo High Precision has earned the trust of high-tech organizations by supplying customer specific high-precision machined metal parts.
Industries served include:
  • Medical
  • Semi-conductor
  • Industrial
  • Automotive
A Million Piece per Month Production Capacity
  • 1st bullet point- "We accept small volume orders starting from one piece while still providing high-precision mass production of over a million pieces and give each order the quality assurance it deserves"
  • Manufacturing capabilities include 30 machining centers with over 200 CNC machines that provide a production capacity in excess of 1,000,000 pieces per month
Difficult-to-Cut Materials
  • Stainless steel
  • Brass
  • Aluminum
  • Tungsten (W)
  • MAT21
  • Molybdenum (Mo)
  • Tantalum (Ta)
  • Niobium (Nb)
  • Hastelloy
  • Inconel
  • Permalloy
  • Alloy 42
  • Kovar
  • Nickel
  • Silver
  • Copper
  • Platinum
... and many more
High-Precision Machining
  • ±0.003mm (±0.00011″) tolerances on Tungsten
  • Nozzle with outer diameter 0.2mm (0.0079″) and inner diameter 0.15mm (0.006″) on Pt
  • Through hole φ0.2mm (0.0079″) length 40mm (1.57″) on Hastelloy
Examples of Koyo’s Machined Parts (Unit: mm)
Optical
Platinum Microfabrication
Application:Nozzles for glass lens refining equipment (camera lenses for facial recognition system)
Material:90％ Pt, 10％ Au
Tolerance:Tip shaft φ0.2 (+0.03/0) Tip holeφ0.15 (0/-0.03)
Pure Tungsten Precision Machining
Application:Lamps for movie theaters
Material:Pure Tungsten
Tolerance:Inner φ±0.003
Medical Equipment
Molybdenum Pipe Machining
Application:Debridement wound instrument
Material:Molybdenum
Tolerance:Outer φ0.45 (+0.03/0) Inner φ0.4 (0/-0.03)
Pure Tungsten Ultra-Thin Machining
Application:Endoscope precision component to determine accurate instrument location
Material:Pure Tungsten
Tolerance:Outer φ8.6 (+0.03/0) Inner φ8.5 (0/-0.03)
Measurement Instrumentation
Honed Part
Application:Component of a digital contact sensor
Material:SUS440C Heat-treated HRC60
Tolerance:Outer φ7±0.003 Inner φ5±0.002
Semiconductor Manufacturing Equipment
Hastelloy Valve Machining
Application:Valves for mass flow limiters
Material:Hastelloy
Tolerance:±0.05 overall
Watch the video of Koyo High Precision
Watch a short movie (00:48)
Watch a narrated movie (2:34)