01
Drawing Review
Drawing review and feasibility analysis before quoting.
Capabilities
Semiconductor Equipment Spare Parts
Precision machining focused on hard materials — tungsten carbide, hardened tool steel and stainless steel. Custom components manufactured strictly to customer drawings.
Quality Control
Six-step quality control
Every project follows the same six steps from drawing review to delivery.
02
Material Confirmation
Material specification confirmed against your requirements.
03
Machining Coordination
Machining sequence coordinated with our manufacturing partner.
04
Dimension Follow-up
In-process dimensional follow-up during production.
05
Final Inspection
Final optical and 2D dimensional inspection before shipment.
06
Packaging & Delivery
Secure packaging and coordinated delivery.
Outsourced Processes
Specialist partner model
We focus on core precision machining. Auxiliary processing is supported through long-term partner facilities.
Heat Treatment
Heat treatment (vacuum hardening, nitriding) handled by verified local specialist partners.
Surface Coating
Surface plating and coating handled by verified local specialist partners.
Partner Model
KOOSEI works with a dedicated long-term manufacturing partner in Chang'an, Dongguan. The facility belongs to our partner.
Core Processes
Precision machining for hard materials
Five core processes focused on tungsten carbide, hardened tool steel and stainless steel.
01 / Grinding1
Precision Surface & Profile Grinding
High-precision grinding for flat surfaces, steps, and tight linear profiles on hardened tool steel and carbide.
Flat surfaces, steps, tight profiles
02 / Wire EDM2
Wire EDM (Slow-Feed)
Each collection starts with a familiar use case: the commute, the kitchen counter, the weekend bag, or the desk that never stays empty.
Contours, micro features, sharp edges
03 / Sinker EDM3
Sinker EDM (Spark Erosion)
Clear shipping windows, straightforward returns, and practical care notes make the purchase feel easy before and after delivery.
Cavities, blind holes, 3D profiles
04 / Carbide4
Tungsten Carbide Machining
EDM & grinding for wear parts
05 / Drilling5
Precision Micro Drilling
Small holes for nozzles & guides