VT machining offers CNC Precision Machining for 420 Stainless Steel (UNS S42000 / 1.4021-1.4034), typically supplied annealed or hardened. Higher carbon than 410 reaches greater hardness; machined annealed then hardened.
CNC Precision Machining Notes for 420 Stainless Steel
420 Stainless Steel mills well with conventional strategies; finishing passes are planned to meet flatness and finish callouts.
For estimating, a 100 × 100 × 10 mm block of 420 Stainless Steel weighs about 0.77 kg.
Starting Parameters for CNC Precision Machining 420 Stainless Steel
| Cutting speed (carbide) | 85-155 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø6 mm end mill | 4510-8220 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
| Thermal growth, 100 mm part, +5 °C | 5.2 µm (CTE 10.3 µm/m·K) |
| Tightest practical tolerance | ±0.002-0.005 mm |
Starting values for 420 Stainless Steel, Annealed or hardened; optimised on the first article.
Full material data for 420 Stainless Steel (UNS S42000 / 1.4021-1.4034) is on the CNC Milling 420 Stainless Steel page.
More on CNC Precision Machining Stainless Steel
Finishing options, quality documentation and general cnc precision machining guidance for all stainless steel grades are on our CNC Precision Machining Stainless Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Precision Machining 420 Stainless Steel
Send a STEP/IGES model or PDF drawing, confirm 420 Stainless Steel and its condition (we usually see it supplied annealed or hardened), the quantity, critical tolerances and any finish or certificate requirements.
420 Stainless Steel in Other Processes
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Send the drawing, the 420 Stainless Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Can VT machining make custom 420 Stainless Steel parts to my drawing?
Yes. 420 Stainless Steel machining is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.
What surface finish is achievable on 420 Stainless Steel with CNC Precision Machining?
Surface finish on 420 Stainless Steel is controlled to your specification; we confirm the achievable Ra against your callout.
Why is 420 Stainless Steel a good choice for CNC Precision Machining?
420 Stainless Steel is corrosion resistant, strong and hygienic, which makes it well suited to CNC Precision Machining. We tune the process to the alloy so the finished 420 Stainless Steel machining part meets your dimensional and functional requirements.
Does CNC Precision Machining 420 Stainless Steel require dedicated tooling?
Most 420 Stainless Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.