VT machining offers CNC Precision Machining for 42CrMo Steel (GB/T 3077 / ~4140 / 42CrMo4), typically supplied Q&T. Chinese equivalent of 4140/42CrMo4.
CNC Precision Machining Notes for 42CrMo Steel
42CrMo 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 42CrMo Steel weighs about 0.79 kg.
Starting Parameters for CNC Precision Machining 42CrMo Steel
| Cutting speed (carbide) | 100-175 m/min |
|---|---|
| Feed per tooth | 0.035-0.123 mm |
| Spindle speed, Ø6 mm end mill | 5310-9280 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (5-8%); dry is possible for interrupted cuts |
| Thermal growth, 100 mm part, +5 °C | 5.9 µm (CTE 11.7 µm/m·K) |
| Tightest practical tolerance | ±0.002-0.005 mm |
Starting values for 42CrMo Steel, Q&T; optimised on the first article.
Full material data for 42CrMo Steel (GB/T 3077 / ~4140 / 42CrMo4) is on the CNC Milling 42CrMo Steel page.
More on CNC Precision Machining Steel
Finishing options, quality documentation and general cnc precision machining guidance for all steel grades are on our CNC Precision Machining Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Precision Machining 42CrMo Steel
Send a STEP/IGES model or PDF drawing, confirm 42CrMo Steel and its condition (we usually see it supplied Q&T), the quantity, critical tolerances and any finish or certificate requirements.
42CrMo Steel in Other Processes
Related
Send the drawing, the 42CrMo 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 Precision Machining 42CrMo Steel?
Achievable tolerances for 42CrMo 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 is the typical lead time and minimum order for CNC Precision Machining 42CrMo Steel?
CNC Precision Machining prototypes for 42CrMo 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.
Can VT machining make custom 42CrMo Steel parts to my drawing?
Yes. 42CrMo 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.
Does CNC Precision Machining 42CrMo Steel require dedicated tooling?
Most 42CrMo Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What surface finish is achievable on 42CrMo Steel with CNC Precision Machining?
Surface finish on 42CrMo Steel is controlled to your specification; we confirm the achievable Ra against your callout.