VT machining offers CNC Boring for 42CrMo Steel (GB/T 3077 / ~4140 / 42CrMo4), typically supplied Q&T. Chinese equivalent of 4140/42CrMo4.
CNC Boring Notes for 42CrMo Steel
Boring bars for 42CrMo Steel are chosen for rigidity, allowing a single finishing pass for size and roundness.
For estimating, a 100 × 100 × 10 mm block of 42CrMo Steel weighs about 0.79 kg.
Starting Parameters for CNC Boring 42CrMo Steel
| Cutting speed (carbide) | 120-210 m/min |
|---|---|
| Feed | 0.07-0.245 mm/rev |
| Spindle speed, Ø30 mm bore | 1270-2230 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (5-8%); dry is possible for interrupted cuts |
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 Turning 42CrMo Steel page.
More on CNC Boring Steel
Finishing options, quality documentation and general cnc boring guidance for all steel grades are on our CNC Boring Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Boring 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
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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 material thickness or size range suits CNC Boring 42CrMo Steel?
Turned 42CrMo Steel parts are produced from bar or chuck stock across a wide diameter range.
What tolerances can you hold for CNC Boring 42CrMo Steel?
Achievable tolerances for 42CrMo Steel turning depend on the alloy, geometry and feature size. Turning holds diameter tolerances to around ±0.005 mm with concentricity within 0.01 mm. Exact figures are confirmed against your drawing callouts.
Can VT machining make custom 42CrMo Steel parts to my drawing?
Yes. 42CrMo Steel turning 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 is CNC Boring 42CrMo Steel and how is it done?
CNC Boring 42CrMo Steel refers to boring enlarges and finishes existing holes to precise diameter, roundness and surface finish. Applied to 42CrMo Steel — strong, economical and widely available — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.