Our CNC Turning Capabilities
EKINSUN operates a fleet of CNC lathes including multi-axis turning centers capable of complex profiles in a single setup. Our turning department handles everything from simple stepped shafts to complex multi-feature components with threads, grooves, tapers, and eccentric features.
All turned parts are inspected using calibrated gauges, micrometers, and CMM equipment. Material certificates and dimensional inspection reports are provided with every order on request.
Technical Specifications
| Parameter | Capability |
|---|---|
| Standard Tolerance | ±0.01mm |
| Precision Tolerance | ±0.005mm |
| Maximum Diameter | Ø 300mm |
| Maximum Length | 1,000mm |
| Surface Finish | Ra 0.4μm (standard), Ra 0.1μm (ground) |
| Thread Types | Metric, UNC, UNF, BSP, NPT, ACME |
| Machine Type | CNC Lathe, Turn-Mill Center |
| Minimum Order | 1 piece |
| Standard Lead Time | 7–15 business days |
| Express Lead Time | 3–7 business days |
| Quality Standard | ISO 9001:2015 |
Materials We Turn
- Aluminum: 6061-T6, 7075-T6, 2024, 5052, MIC-6
- Stainless Steel: 304, 316L, 303 (free-machining), 17-4PH, 420
- Brass: C36000 (free-cutting), C26000, C46400
- Carbon & Alloy Steel: 1018, 1045, 4140, 4340, 8620
- Titanium: Grade 2, Grade 5 (Ti-6Al-4V)
- Copper: C11000, C10100, Beryllium Copper
- Engineering Plastics: Delrin (POM), PEEK, Nylon, PTFE, PC
- Nickel Alloys: Inconel 625, Inconel 718, Monel 400
Typical CNC Turned Parts
CNC turning produces any rotationally symmetric geometry — from simple pins and spacers to complex multi-diameter shafts with grooves, threads, tapers and drilled cross-holes. Below are the most common part families we machine:
- Shafts and axles — stepped, splined, keyed, ground finish
- Bushings and sleeves — press-fit, flanged, self-lubricating bronze
- Threaded fittings and connectors — NPT, BSP, metric, JIC
- Pins and dowels — hardened, ground, tight-tolerance
- Flanges and hubs — bolt-circle drilled, keyways, bored
- Nozzles and orifices — precision-drilled, tight ID tolerance
- Spacers and standoffs — any length and OD combination
- Valve bodies and stems — multi-diameter, port-drilled
Turned Parts We Quote Every Week — by Part, Material & Application
These are the specific part families buyers come to us for most often. If your part fits one of these, we can quote it in 24 hours from your drawing, sketch or sample:
Precision Shafts
6061 Al · 303 SS · 4140 Steel · 42CrMo4 · Ti-6Al-4V
Ø6–80mm, length up to 1,000mm · stepped, keyed, splined, taper, ground finish
Used in: pump drives · conveyor systems · gearboxes · motor assemblies · agitator drives
OEM shaft broken or discontinued? Send the worn piece — we CMM it, rebuild CAD free, machine a replacement in 4140 or stainless to original spec or better.
Custom shafts →Bushings & Sleeves
303 SS · 316L · Bronze C93200 · PTFE · Delrin POM
ID Ø5–120mm · flanged, plain, split · any wall thickness · press-fit or slip-fit
Used in: bearing journals · sleeve bearings · linear guides · pivot points · food-processing equipment
Standard catalogue bushing is the wrong ID or OD? We turn exact-fit in any material — including food-grade PTFE and self-lubricating bronze C93200.
Custom bushings →Threaded Fittings & Connectors
C36000 Brass · 316L SS · 303 SS · 4140 Steel
M4–M64 · UNC/UNF 1/4"–2" · NPT/BSP/JIC · any thread combination on one part
Used in: hydraulic manifolds · pneumatic lines · plumbing assemblies · air fittings · instrumentation
Need a non-catalogue thread combination — BSP inlet with NPT outlet, or M22×1.5 where M20 is standard? We machine any thread form on a single part.
Custom fittings →Keyway & Spline Shafts
4140 Steel · 1045 · 42CrMo4 · 303 SS
Ø15–100mm · DIN 6885 / ANSI B17.1 keyway · involute spline · hardened H&G option
Used in: gearboxes · sprocket drives · pulley assemblies · motor output shafts · worm drives
Non-standard keyway position, double keyway, or keyway on a tapered section? We machine it from drawing or reproduce from your existing shaft with no OEM part number needed.
Keyway shafts →Spacers & Standoffs
6061 Al · 303 SS · C360 Brass · Nylon · Delrin
Any OD/ID/length · plain bore, threaded through, tapped end · batch from 1 piece
Used in: electronics assemblies · structural spacing · motor mounts · PCB standoffs · optical mounts
Catalogue standoff wrong length or pitch? We turn exact-spec spacers in any material and quantity — no setup fee, no minimum batch, all tiers priced upfront.
Custom spacers →Precision Pins & Dowels
4140 Steel · 303 SS · Ti-6Al-4V · hardened 52100
Ø2–30mm · tolerance ±0.003mm · DIN 7/DIN 6325 · ground finish Ra 0.2μm
Used in: CMM fixtures · jig plates · pivot joints · locating pins · assembly alignment dowels
Standard DIN 7 pin wrong diameter, length or shoulder geometry? We machine to exact tolerance — or reproduce from your worn pin with CMM measurement.
Custom pins →Flanges & Hubs
1045 Steel · 304 SS · 6061 Al · 4140
OD up to Ø300mm · bolt-circle drilled · keyway · bored to shaft fit · weld-neck or slip-on
Used in: pump coupling · shaft coupling · pipe flanges · motor adapters · gear hubs
Non-standard PCD, bore size or bolt pattern? We machine flanges to your exact drawing — including IEC/NEMA motor register diameters not available off the shelf.
Custom flanges →Valve Stems & Piston Rods
316L SS · 17-4PH SS · 4140 Chrome-plated · Ti-6Al-4V
Multi-diameter · sealing grooves · port-drilled · hard-chrome plate option
Used in: gate valves · globe valves · hydraulic cylinders · pneumatic actuators · flow control
OEM valve stem failed and lead time is 10 weeks? We reproduce from the worn stem or drawing — including chrome-plated hydraulic rod to original OD tolerance.
Replacement parts →Who Gets CNC Turning Quotes From Us?
The four buyer types we serve most — and the specific problem each one comes to us with:
Maintenance & Repair Engineers
"The pump shaft snapped. OEM wants 8 weeks and a minimum of 10 pieces. I need one shaft in 5 days."
We reproduce the shaft from the broken piece: CMM measurement, free CAD reconstruction, machined in 4140 or stainless to original spec or better. Single piece, no setup fee, delivered in days — not weeks. Replacement machine parts →
Product Designers & Prototype Engineers
"I have a hand sketch of a new spindle. I need one prototype turned before committing to a full production run."
Sketch, PDF, DXF, STEP or rough dimensions — all accepted. We model it in CAD, confirm every dimension with you, then turn the prototype. One piece, no minimum charge, no tooling cost. Modifications quoted flat.
Procurement & Sourcing Managers
"Our current turned-parts supplier stopped taking small orders. I need a China CNC manufacturer for repeat batches of 10–500 pieces with material certs."
EKINSUN is a direct ISO 9001:2015 certified manufacturer — no middleman, no MOQ floor. Mill certificates on every metal order. Your CAD is locked after first-article approval — every reorder matches the first. Worldwide DHL/FedEx shipping with commercial invoice.
Machine Builders & OEM Integrators
"I'm designing a non-standard gearbox. I need shafts and bushings in specific alloys that aren't available from catalogue suppliers."
We turn from stock in over 30 alloys — including 42CrMo4, 17-4PH, Ti-6Al-4V, Inconel 625 and bronze C93200. Custom alloy combinations on one order, all quoted in a single RFQ. Material certs and FAI reports included.
Search Terms — If You Found Us This Way, We Can Quote It
Common searches that lead buyers to EKINSUN for precision turned parts:
Surface Finishes for Turned Parts
The as-turned Ra 0.8μm finish suits most functional parts. Specify a finish on your drawing and we apply it before shipping:
As-Turned
Ra 0.8μm. No additional cost. Clean, functional surface.
Fine Turning
Ra 0.4μm. Slower feed, sharp insert. For sealing surfaces.
Ground Finish
Ra 0.1–0.2μm. Cylindrical grinding post-turning. Bearing fits.
Anodize (Al)
Type II clear or colour. Type III hard-anodize for wear resistance.
Zinc Plate
Bright or yellow passivate. Corrosion protection for steel parts.
Black Oxide
Mild corrosion resistance + aesthetics. Common for steel shafts.
Electropolish
316L stainless. Smoother than as-turned, improved corrosion resistance.
Nickel Plate
Electroless or electrolytic. Wear and corrosion protection.
Workshop & Quality Inspection
Every turned part is inspected before it leaves our facility. Dimensional checks use calibrated micrometers, plug gauges, ring gauges and CMM scanning. Critical features are reported on a dimensional inspection report — included with aerospace and medical orders as standard, available on request for any order.
Our ISO 9001:2015 certification covers design validation, incoming material inspection, in-process quality gates, and final dimensional verification. Every shipment includes a packing list with part quantity and material grade. Inspection reports, material certificates and FAI reports are available on request.
Frequently Asked Questions
Standard tolerance is ±0.01mm. For critical dimensions we achieve ±0.005mm. Tighter tolerances to ±0.002mm are possible using precision grinding as a secondary operation. Always specify critical tolerances on your drawing.
Yes. We accept hand sketches, photos of existing parts, and rough dimension lists. Our engineers redraw your input as a CAD file, send it for your approval, then machine the parts. No CAD software required.
Yes. Material mill certificates (MTR) are provided for all metal orders as standard. Dimensional inspection reports are available on request and included automatically for aerospace and medical orders.
1 piece. No setup fees, no minimum charges. We machine single prototypes as readily as production runs of thousands.
Yes — this is one of our most common jobs. Send the broken shaft (or clear photos from multiple angles with at least one known dimension). We measure it on a CMM, recover the original geometry (not the worn state), build a CAD model and send it for your approval before machining. No OEM drawing, no part number, no CAD file needed. See Replacement Machine Parts and Reverse Engineering for how it works.
Yes. Non-standard sizes are our everyday work. We stock C93200 bearing bronze and can turn any ID/OD/length combination — flanged, plain, split or with oil grooves. No special tooling surcharge; just send the bore diameter, shaft diameter, length and whether you need a flange. We also make in PTFE, Delrin, nylon and stainless for food-grade or corrosive environments.
The more you send the faster and more accurate the quote — but at minimum: a drawing or sketch with key dimensions, material preference (or what the part does so we can suggest one), quantity and delivery country. Photos of the part, the assembly it goes into, or the worn original are all helpful. We send follow-up questions before quoting anything unclear — we'd rather ask once than machine the wrong part.
Yes. After your first order, your CAD file is stored in our system. Reorders use the same file, same material grade and same inspection criteria — so every batch matches the first. We issue material mill certificates on every metal order and can provide dimensional inspection reports on request. Most repeat customers see price reductions on later runs as setup time shrinks. Email [email protected] to discuss a supply agreement.
Get a Turning Quote
Send your drawing — any format. Quote in 24 hours.
// Qty & price
1 pc
Sample price
Confirm fit before a run
3–10
Unit price drops
Setup cost shared
10+
Best price
All tiers quoted upfront
- →No distributor — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price
Or email: [email protected]