What stainless steel grades can you CNC machine?+
We machine all major stainless steel grades including 304, 316/316L, 17-4PH, 420, and 440C. Each grade is selected based on your application requirements for corrosion resistance, hardness, and mechanical properties. We also work with duplex stainless steels (2205, 2507) and specialty alloys on request.
What tolerances can you hold on stainless steel parts?+
We routinely hold tolerances of ±0.01mm on CNC machined stainless steel parts. For critical dimensions, we can achieve ±0.005mm with specialized fixturing and process controls. All parts are CMM-inspected with full dimensional reports available.
Why is stainless steel harder to CNC machine than regular steel?+
Stainless steel work-hardens rapidly during machining, meaning the material gets harder as it is cut. This causes accelerated tool wear, generates more heat, and requires slower cutting speeds, rigid setups, and specialized tooling. Austenitic grades (304, 316) are particularly prone to work hardening, while martensitic grades (420, 440C) present challenges due to their high hardness after heat treatment.
What surface finishes are available for stainless steel parts?+
We offer passivation, electropolishing, mirror polishing (Ra 0.05μm), bead blasting, brushed finish, and PVD coating. Passivation is recommended for all stainless steel parts to maximize corrosion resistance. Electropolishing is preferred for medical and food-contact applications where ultra-smooth, hygienic surfaces are required.
How much do CNC machined stainless steel parts cost?+
Pricing depends on grade, complexity, tolerances, quantity, and finishing requirements. Stainless steel parts typically cost 20-40% more than carbon steel equivalents due to higher material costs and slower machining speeds. We provide free, detailed quotes within 24 hours — send your drawings for an accurate estimate.
What is the typical lead time for stainless steel CNC machining?+
Prototypes are typically delivered in 5-7 business days. Production batches range from 2-4 weeks depending on quantity and complexity. We maintain stock of common grades (304, 316) for faster turnaround and can expedite urgent orders when needed.
Can you machine food-grade and medical-grade stainless steel?+
Yes. We regularly machine 316L for medical implants and surgical instruments, and 304/316 for food processing equipment. We provide material certificates (mill certs), comply with ASTM A967 for passivation, and can meet FDA and ISO 13485 documentation requirements for medical device components.
What industries do your stainless steel machining services serve?+
We serve medical devices, food processing, marine and offshore, chemical processing, pharmaceutical, aerospace, automotive, and oil and gas industries. Any application requiring corrosion-resistant, high-strength precision parts is within our capability.
Do you offer both CNC milling and CNC turning for stainless steel?+
Yes. We have TSUGAMI CNC lathes for precision turning of shafts, fittings, and cylindrical components, and multi-axis CNC milling centers for complex 3D geometries, housings, and structural parts. Both are optimized for stainless steel with high-pressure coolant systems and carbide tooling.
What is the difference between passivation and electropolishing?+
Passivation uses a citric or nitric acid bath to remove free iron and enhance the natural chromium oxide layer, improving corrosion resistance without changing the surface appearance. Electropolishing goes further — it electrochemically removes a thin surface layer (20-40μm), producing a smoother, brighter finish with even better corrosion resistance. Electropolishing is preferred for medical, pharmaceutical, and food-contact applications.
