CNC Turning Alloy 42 from VT machining delivers precision Alloy 42 parts made to your exact drawing. CNC turning rotates the workpiece against a single-point tool to produce cylindrical features, threads and grooves, with parameters tuned to Alloy 42, which is matched/low thermal expansion for sealing.
CNC Turning Capability for Alloy 42
- Matched/low thermal expansion
- Glass-to-metal sealing
- Tolerance to ±0.01 mm
- Electronics-grade
Alloy 42 Material Data
| Density | 8.36 g/cm³ |
|---|---|
| Tensile strength | 517 MPa |
| Yield strength (0.2%) | 340 MPa |
| Hardness | 140–160 HV |
| Melting point | 1450 °C |
| Thermal conductivity | 17.3 W/m·K |
| Thermal expansion | 5.1 (30–200 °C) ×10⁻⁶/K |
| Electrical conductivity | 3.5% |
| Machinability (C36000 = 100%) | 35% |
| Grades we run | Kovar / ASTM F15, Alloy 42, Alloy 52 |
Published typical values for Kovar (ASTM F15). Other grades in the family differ — the certificate supplied with your order carries the actual heat-lot figures.
Sealing surfaces must stay clean. Parts destined for glass-to-metal seals are degreased and handled without bare hands after final machining.
Machining Alloy 42 with CNC Turning
The machinability of Alloy 42 is moderate; gummy, requires sharp tooling and careful thermal control. For CNC Turning we select tooling, feeds, speeds and coolant to match, keeping the Alloy 42 workpiece stable and the result accurate.
Because we machine Alloy 42 regularly, proven settings shorten setup and keep quality repeatable across reorders.
Achievable Tolerances for CNC Turning Alloy 42
| Feature | Standard | Precision |
|---|---|---|
| Outside diameter | ±0.05 mm | ±0.005 mm |
| Bore diameter | H9 | H6 |
| Length / shoulder position | ±0.10 mm | ±0.020 mm |
| Concentricity OD to ID | 0.05 mm TIR | 0.010 mm TIR |
| Roundness | 0.02 mm | 0.005 mm |
| Thread class | 6g / 2A | 4h / 3A |
| Surface finish, as turned | Ra 1.6 µm | Ra 0.4 µm |
Standard is what a normal quotation assumes. Precision is available on nominated features and is priced separately, because it needs extra setups, in-process gauging and CMM verification. Call out only the features that need it — blanket-tightening a drawing is the single most common reason a quote comes back expensive.
Design Tips for CNC Turning Alloy 42
A few design choices make a real difference to cost and quality. Consistent diameters, standard thread forms and avoiding extremely long, slender features help Alloy 42 turned parts stay concentric and economical. If you send your model early, we will return practical DFM feedback before you commit to production.
CNC Turning Quality & Inspection
Consistent quality comes from disciplined process control. Critical dimensions on Alloy 42 parts are checked in-process and verified at final inspection using calibrated instruments and, where required, CMM measurement. Full documentation — dimensional reports, mill certs, FAIR — is available when your programme needs it.
CNC Turning Tolerances & Surface Finish
Turned Alloy 42 holds diameter tolerances to about ±0.005 mm with concentricity within 0.01 mm and good roundness. Turned finishes of Ra 0.4–0.8 µm are achievable with finishing passes and sharp tooling.
The tightest tolerances are reserved for the features your drawing flags as critical. Share your tolerance scheme and we will confirm what is realistic before quoting.
Secondary Operations & Finishing
We complete Alloy 42 components with the secondary steps your drawing calls for. We arrange heat treatment, surface treatment, marking and assembly as needed. Tell us the final spec and we will plan the full route so parts arrive ready to use.
Why Alloy 42?
Specifying Alloy 42 for CNC Turning Alloy 42 is usually about its properties: matched/low thermal expansion for sealing. Tell us the condition you need and we machine to it.
Applications of CNC Turning Alloy 42
CNC Turning of Alloy 42 supports parts across aerospace, medical, automotive, electronics, semiconductor, energy and general industrial sectors. We scale from one-off prototypes to ongoing production while holding the same quality.
How to Order CNC Turning Alloy 42
Ordering Alloy 42 parts is straightforward. Provide the drawing, material, quantity and any certification needs. Our engineers reply — in English — with feasibility, pricing and a realistic lead time, usually within one business day.
Finishing Options for Alloy 42
| Finish | Thickness / effect | Why it gets specified |
|---|---|---|
| Deburr / edge break | 0.05–0.3 mm | All parts unless the drawing says otherwise |
| Bead blast | Ra 1.6–3.2 µm | Uniform matt finish, hides tool marks |
| Laser marking | — | Part number, lot code, data matrix |
No drawing yet? Build one in the browser.
Set the metal, dimensions and features, watch the 3D model update as you type, then switch to the 2D sheet to add dimensions and tolerances. Download it or send it straight to us with your RFQ.
What We Need to Quote CNC Turning Alloy 42
- GeometrySTEP or IGES for the 3D model, plus a PDF drawing if you have tolerance callouts. A dimensioned sketch is enough to start.
- MaterialThe exact Alloy 42 grade and condition — temper, heat-treat state or hardness. If you are not sure, tell us the function and we will suggest one.
- QuantityPrototype count and the expected annual volume. Both change how the part is made and therefore what it costs.
- TolerancesWhich features are critical. Everything else runs to our standard tolerance, which is what keeps the price sensible.
- FinishSurface treatment, cosmetic requirements, and any faces that must be masked.
- DocumentsWhether you need a material certificate, dimensional report, FAIR or PPAP with the shipment.
Missing something from the list is not a problem — send what you have. We will come back with the specific questions rather than a generic form.
Alloy 42 in Other Processes
Related
Send the drawing, the Alloy 42 condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
How clean are the edges produced by CNC Turning on Alloy 42?
Machined Alloy 42 edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What material thickness or size range suits CNC Turning Alloy 42?
Turned Alloy 42 parts are produced from bar or chuck stock across a wide diameter range.
What is the typical lead time and minimum order for CNC Turning Alloy 42?
CNC Turning prototypes for Alloy 42 can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.
Why is Alloy 42 a good choice for CNC Turning?
Alloy 42 is matched/low thermal expansion for sealing, which makes it well suited to CNC Turning. We tune the process to the alloy so the finished Alloy 42 turning part meets your dimensional and functional requirements.
Which industries use CNC Turning Alloy 42 parts?
CNC Turning Alloy 42 parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise Alloy 42 components are required.
What surface finish is achievable on Alloy 42 with CNC Turning?
Surface finish on Alloy 42 is controlled to your specification; we confirm the achievable Ra against your callout.