We machine forged shafts from carbon steel, alloy steel and stainless, holding ±0.005 mm on journals, shoulders and splines. One-off prototypes through 10,000-piece runs.
A forged blank arrives with scale and an off-center parting line. Skim the journal to clean it up and the press fit turns loose. The bearing spins on the shaft, fretting eats the seat, and the whole gearbox comes back.
Forge stock carries residual stress. Cut one side of a 1,200 mm shaft and it bows. You measure it straight on the bench, then it moves 0.15 mm once it sits overnight or sees service heat.
Flanks cut from bar stock have no grain flow following the profile. Under reversing torque the flanks pit early, backlash opens up, and the customer hears it before your warranty period ends.
A supplier ships forged shafts with a generic mill certificate. Your auditor asks for heat numbers traceable to the raw stock. Now the parts sit in quarantine while you chase paperwork.
Two capabilities decide whether a forged shaft performs: how the blank was formed, and how the finished geometry is held.
A forged shaft starts as a billet heated and worked into shape. The deformation bends the grain so it runs along the axis and follows the shoulders instead of being cut across them. On a 4140 drive shaft carrying reversing torque, that continuous flow is what resists fatigue crack growth at the fillet.
We work from forged blanks in carbon steel, alloy steel, stainless and titanium, then machine them on 16 simultaneous 5-axis centers and 16 mill-turn centers. Long shafts up to 4,000 mm go onto the large-travel machines. Short, high-volume parts run on the 500 × 500 × 450 mm platforms.
A forged shaft usually needs three operations chained together: turn the journals and shoulders, cut the spline or keyway, then grind the bearing seats. We keep them in one setup family so the datums stay consistent. Journal-to-journal runout is checked against the drawing, not against the last operation.
Bearings need more than a diameter. Surface finish on the seat decides whether the inner ring creeps under load. Ground seats land at Ra 0.2–0.8 μm. Turned shoulders and non-critical diameters sit at Ra 1.6–3.2 μm, which keeps cost down where finish does not matter.
Use this to decide before you send a drawing.
| Condition | Forged shaft | Machined from bar |
|---|---|---|
| Reversing or impact load | Preferred, grain flow follows profile | Flanks can pit early |
| Shaft Ø over 200 mm | Preferred, less material removed | Heavy stock removal, long cycle |
| Prototype, 1–5 pieces | Possible, longer blank lead time | Faster to first part |
| Tight section change | Better fatigue at fillets | Stress riser at the step |
| Simple straight shaft | Overkill for the cost | Usually the right call |
| High-volume runs | Near-net blank saves material | Bar stock per part is higher |
Drawings or samples, any quantity from one piece to 10,000. Material, heat treatment and finish specified per part.
Involute and straight-sided splines, keyways and integral gear teeth cut after the journals are turned.
Rotor seats, bearing journals and balance features for electric motor and EV drivetrain assemblies.
Forged sections joined to hubs or flanges, with weld prep turned on the same datums as the journals.
Threaded and worm profiles turned and ground, with pitch diameter checked against the mating worm wheel.
Through-hardening, case hardening, black oxide, plating, anodizing and laser marking with 1.5 mm minimum character height.
| Item | Range or detail |
|---|---|
| Materials | 1018, 1045, 4130, 4140, 4340, tool steel; 303/304/316/17-4PH; TA1, TC4 |
| Maximum length | 4,000 mm on the large-travel machines |
| Diameter | Up to Ø400 mm on the rotary table |
| Tolerance | ±0.005 mm on critical diameters |
| Surface finish | Ra 0.2–0.8 μm ground, Ra 1.6–3.2 μm as machined |
| Inspection | 100% before shipment, reports on request |
| Certifications | ISO 9001:2015, IATF 16949:2016, ISO 13485:2016 |
| Order size | No minimum, from one prototype to 10,000+ parts |
Shafts and rotating parts have been the core of our work for 15 years, across three wholly-owned plants in Dongguan and Singapore.
On bearing journals and spline diameters, verified with in-process checks rather than a final pass at the end.
16 simultaneous 5-axis centers, 16 mill-turn centers, 12 four-axis mills and 27 three-axis machines.
Long drive and line shafts that most shops have to sub out stay in our own building.
Raw material check, in-process monitoring and final inspection before anything is packed.
Send a drawing and get a quotation plus a free DFM analysis within 12 hours.
Motor and drivetrain shafts need heat-number traceability and IATF-aligned process control from forging through grinding.
Long line shafts must hold straightness after machining and stay round where the bearings seat.
Spline and gear shafts need tight backlash control so positioning repeatability holds over millions of cycles.
High-torque shafts run under continuous load, so grain flow direction and fillet finish decide service life.
Choose forged when the shaft sees reversing load, impact or high torque, and when the grain flow needs to follow the profile rather than be cut across it. Fillets and shoulders benefit most.
Bar stock is the better call for short straight shafts, small diameters and one-off prototypes where the forging lead time would slow the build.
We hold ±0.005 mm on critical diameters, which is ±0.0002 in. Bearing seats are usually ground after turning to reach that band and to control roundness.
Tell us the bearing fit you need (for example k5 or m6) and we will machine to the fit rather than to a nominal diameter.
We rough turn, let the part rest, then finish. For shafts near the 4,000 mm limit we plan the operation sequence so material is removed evenly from both sides of the axis.
Straightness is checked on the drawing datum after finishing, not straight off the machine while the part is still warm.
Carbon and alloy steel: 1018, 1045, 4130, 4140, 4340, A36 and tool steel. Stainless: 303, 304, 316, 316L, 420, 440C and 17-4PH. Titanium and nickel alloys: TA1, TA2, TC4 and Inconel.
Material choice drives the heat treatment and finish options, so it helps to name the load case rather than just the grade.
Yes. Splines, keyways and integral gear teeth are cut after the journals are turned, using the same datums. That keeps runout between the bearing seat and the spline under control.
Involute splines are checked on pitch diameter and flank finish, since backlash and wear both trace back to those two values.
We machine from forged blanks and manage the sequence so the blank arrives with enough stock for cleanup without wasting cycle time. Near-net blanks reduce the material you pay to turn into chips.
Heat treatment and finishing such as black oxide, plating or anodizing are handled in the same order, so the shaft ships ready to assemble.
There is no minimum. We run from a single prototype up to 10,000-piece runs on the same process route.
For first articles we can quote a free DFM analysis within 12 hours of receiving your drawing, and production can start within 24 hours of approval.
Every shaft is inspected 100% before shipment. That covers raw material verification, in-process monitoring and final dimensional checks.
Inspection reports and material certificates are available on request, with heat numbers traceable to the incoming stock. Uploads stay confidential and we sign an NDA when you need one.
Upload your shaft drawing or a sample photo. We reply with a quotation and a free DFM analysis within 12 hours, with no minimum order quantity.
12-hour quote100% inspectionNo MOQNDA on request
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Upload your 3D model or 2D drawing and get a quotation with a free DFM analysis. Maximum processing size 4,000 mm.
CNC Metals 13 grades
CNC Plastics 10 grades
Machines & processes 12 options
Surface & post-processing 10 options
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