VT machining offers CNC Boring for 4142 Alloy Steel (UNS G41420 / ~42CrMo4), typically supplied pre-hardened (28-32 HRC). Slightly higher carbon than 4140; commonly stocked pre-hardened.
CNC Boring Notes for 4142 Alloy Steel
Boring bars for 4142 Alloy Steel are chosen for rigidity, allowing a single finishing pass for size and roundness.
For estimating, a 100 × 100 × 10 mm block of 4142 Alloy Steel weighs about 0.79 kg.
Starting Parameters for CNC Boring 4142 Alloy Steel
| Cutting speed (carbide) | 100-170 m/min |
|---|---|
| Feed | 0.07-0.21 mm/rev |
| Spindle speed, Ø30 mm bore | 1060-1800 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion (6-8%) |
Starting values for 4142 Alloy Steel, Pre-hardened (28-32 HRC); optimised on the first article.
Full material data for 4142 Alloy Steel (UNS G41420 / ~42CrMo4) is on the CNC Turning 4142 Alloy Steel page.
More on CNC Boring Alloy Steel
Finishing options, quality documentation and general cnc boring guidance for all alloy steel grades are on our CNC Boring Alloy Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Boring 4142 Alloy Steel
Send a STEP/IGES model or PDF drawing, confirm 4142 Alloy Steel and its condition (we usually see it supplied pre-hardened (28-32 HRC)), the quantity, critical tolerances and any finish or certificate requirements.
4142 Alloy Steel in Other Processes
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Send the drawing, the 4142 Alloy Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
What is CNC Boring 4142 Alloy Steel and how is it done?
CNC Boring 4142 Alloy Steel refers to boring enlarges and finishes existing holes to precise diameter, roundness and surface finish. Applied to 4142 Alloy Steel — high-strength and hardenable — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What tolerances can you hold for CNC Boring 4142 Alloy Steel?
Achievable tolerances for 4142 Alloy 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.
Does CNC Boring 4142 Alloy Steel require dedicated tooling?
Most 4142 Alloy Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
What material thickness or size range suits CNC Boring 4142 Alloy Steel?
Turned 4142 Alloy Steel parts are produced from bar or chuck stock across a wide diameter range.
What is the typical lead time and minimum order for CNC Boring 4142 Alloy Steel?
CNC Boring prototypes for 4142 Alloy 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 4142 Alloy Steel parts to my drawing?
Yes. 4142 Alloy 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.