VT machining offers CNC Tapping 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 Tapping Notes for 420 Stainless Steel
420 Stainless Steel is tapped with cut taps (spiral-point for through holes) and controlled rigid-tapping speed; thread milling is used where tap breakage would be costly.
For estimating, a 100 × 100 × 10 mm block of 420 Stainless Steel weighs about 0.77 kg.
Starting Parameters for CNC Tapping 420 Stainless Steel
| Cutting speed (carbide) | 10-15 m/min |
|---|---|
| Recommended tap | Cut tap: spiral-point (through) / spiral-flute (blind) |
| Tap drill for M8×1.25 | Ø6.8 mm (cut tap) |
| Spindle speed, M8 | 400-600 rpm |
| Insert / tool class | ISO M — positive-rake PVD/CVD carbide |
| Coolant | Flood emulsion (8-10%) or high-pressure coolant |
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 Tapping Stainless Steel
Finishing options, quality documentation and general cnc tapping guidance for all stainless steel grades are on our CNC Tapping Stainless Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Tapping 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
What tolerances can you hold for CNC Tapping 420 Stainless Steel?
Achievable tolerances for 420 Stainless Steel machining depend on the alloy, geometry and feature size. Milling holds positional and dimensional tolerances to around ±0.01 mm, tighter with precision setups. Exact figures are confirmed against your drawing callouts.
What surface finish is achievable on 420 Stainless Steel with CNC Tapping?
Surface finish on 420 Stainless Steel is controlled to your specification; we confirm the achievable Ra against your callout.
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.
Why is 420 Stainless Steel a good choice for CNC Tapping?
420 Stainless Steel is corrosion resistant, strong and hygienic, which makes it well suited to CNC Tapping. We tune the process to the alloy so the finished 420 Stainless Steel machining part meets your dimensional and functional requirements.
What is the typical lead time and minimum order for CNC Tapping 420 Stainless Steel?
CNC Tapping prototypes for 420 Stainless Steel can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.