VT machining provides CNC Gear Grinding 8620 Alloy Steel for customers who need accurate, repeatable 8620 Alloy Steel components. The machinability of 8620 Alloy Steel is good in annealed condition; machined soft then heat-treated to final hardness, so we set the operation up specifically for this grade.
CNC Gear Grinding Capability for 8620 Alloy Steel
- Cr-Mo / Ni-Cr-Mo grades
- High strength & hardenability
- Tolerance to ±0.01 mm
- Heat-treatable to 30–55 HRC
8620 Alloy Steel Material Data
| Density | 7.85 g/cm³ |
|---|---|
| Tensile strength | 655–1020 MPa |
| Yield strength (0.2%) | 415–900 MPa |
| Hardness | 197–302 HB |
| Melting point | 1416 °C |
| Thermal conductivity | 42.6 W/m·K |
| Thermal expansion | 12.3 ×10⁻⁶/K |
| Electrical conductivity | 8% |
| Machinability (C36000 = 100%) | 65% (annealed) |
| Grades we run | 4140, 4340, 8620, 20CrMnTi, 42CrMo4, 20MnCr5 |
Published typical values for 4140 (Q&T). Other grades in the family differ — the certificate supplied with your order carries the actual heat-lot figures.
Heat treatment moves the part. Anything held tighter than ±0.02 mm is machined soft, hardened, then ground or hard-turned to final size.
Machining 8620 Alloy Steel with CNC Gear Grinding
The machinability of 8620 Alloy Steel is good in annealed condition; machined soft then heat-treated to final hardness. For CNC Gear Grinding we select tooling, feeds, speeds and coolant to match, keeping the 8620 Alloy Steel workpiece stable and the result accurate.
Because we machine 8620 Alloy Steel regularly, proven settings shorten setup and keep quality repeatable across reorders.
Achievable Tolerances for CNC Gear Grinding 8620 Alloy Steel
| Feature | Standard | Precision |
|---|---|---|
| Accuracy class | DIN 8 / AGMA 10 | DIN 6 / AGMA 12 |
| Profile deviation | 0.020 mm | 0.008 mm |
| Lead deviation | 0.020 mm | 0.008 mm |
| Pitch deviation (cumulative) | 0.040 mm | 0.015 mm |
| Runout | 0.030 mm | 0.010 mm |
| Tooth surface finish | Ra 1.6 µm | Ra 0.4 µm (ground) |
| Module range | m0.5–m8 | m1–m6 |
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.
CNC Gear Grinding Tolerances & Surface Finish
Gear features are produced to a specified DIN/AGMA accuracy class, with profile and lead controlled for quiet, durable running under load.
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.
Design Tips for CNC Gear Grinding 8620 Alloy Steel
A few design choices make a real difference to cost and quality. Providing complete gear data (module, pressure angle, profile shift, quality class) lets us produce 8620 Alloy Steel gears right the first time. If you send your model early, we will return practical DFM feedback before you commit to production.
CNC Gear Grinding Quality & Inspection
Consistent quality comes from disciplined process control. Critical dimensions on 8620 Alloy Steel 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.
Secondary Operations & Finishing
We complete 8620 Alloy Steel 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 8620 Alloy Steel?
Specifying 8620 Alloy Steel for CNC Gear Grinding 8620 Alloy Steel is usually about its properties: high-strength and hardenable. Tell us the condition you need and we machine to it.
Applications of CNC Gear Grinding 8620 Alloy Steel
CNC Gear Grinding of 8620 Alloy Steel 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 Gear Grinding 8620 Alloy Steel
Ordering 8620 Alloy Steel 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 8620 Alloy Steel
| Finish | Thickness / effect | Why it gets specified |
|---|---|---|
| Through hardening | — | 30–55 HRC, ground afterwards for tight sizes |
| Case hardening (carburise) | 0.3–1.2 mm case | 58–62 HRC surface, tough core |
| Nitride | 0.1–0.5 mm | 900–1100 HV, minimal distortion |
| Black oxide | 1–2 µm | Cosmetic + light corrosion protection |
| Zinc / nickel plate | 5–25 µm | Corrosion protection |
| 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 Gear Grinding 8620 Alloy Steel
- 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 8620 Alloy Steel 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.
8620 Alloy Steel in Other Processes
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Send the drawing, the 8620 Alloy Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
Why is 8620 Alloy Steel a good choice for CNC Gear Grinding?
8620 Alloy Steel is high-strength and hardenable, which makes it well suited to CNC Gear Grinding. We tune the process to the alloy so the finished 8620 Alloy Steel gear cutting part meets your dimensional and functional requirements.
How clean are the edges produced by CNC Gear Grinding on 8620 Alloy Steel?
Machined 8620 Alloy Steel edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What surface finish is achievable on 8620 Alloy Steel with CNC Gear Grinding?
Surface finish on 8620 Alloy Steel is controlled to your specification; we confirm the achievable Ra against your callout.
What tolerances can you hold for CNC Gear Grinding 8620 Alloy Steel?
Achievable tolerances for 8620 Alloy Steel gear cutting depend on the alloy, geometry and feature size. We hold tight, repeatable tolerances appropriate to the feature and material. Exact figures are confirmed against your drawing callouts.
What is CNC Gear Grinding 8620 Alloy Steel and how is it done?
CNC Gear Grinding 8620 Alloy Steel refers to gear grinding finishes hardened gear teeth to high accuracy class for quiet, durable transmission. Applied to 8620 Alloy Steel — high-strength and hardenable — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
Does CNC Gear Grinding 8620 Alloy Steel require dedicated tooling?
Most 8620 Alloy Steel gear cutting work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.