ISO 9001 Certified  ·  China Precision Machining Supplier

CNC Machining
Services Built to Spec. Delivered on Time.

Custom CNC machined parts from a vertically integrated China facility — ±0.005 mm tolerances, 3/4/5-axis milling and turning, prototype to production. Engineering team on every project.

Tolerance ±0.005 mm 3 / 4 / 5-Axis CNC Quote in 24H Delivery in 5–7 Days Full CMM Reports
NDA available upon request for all projects.
ISO 9001 CertifiedFull inspection & lot traceability
24H DFM FeedbackEngineering review before quoting
Global Shipping 5–7 DaysNA · Europe · Asia-Pacific
100% First-Article CMM ReportsFull dimensional report, not just a CoC
Industry pain points

Common Challenges in CNC Machining Sourcing

Engineers and procurement teams run into the same walls, again and again. Here's what actually goes wrong when sourcing precision machined components.

01

Tolerance stack-up across multi-step setups causes out-of-spec deliveries

When a part requires repositioning between ops — turning, then milling, then drilling — cumulative datum shift can push GD&T callouts beyond acceptable limits, even when individual operations pass.

GD&T / Datum shift
02

Lead time collapses under engineering change orders mid-production

ECOs issued after tool paths are programmed or first articles are cut force full re-quoting cycles, scrapped fixtures, and schedule slippage — most suppliers can't absorb late-stage design revisions without a hard reset.

ECO / Lead time
03

Material and surface finish specs are misinterpreted without DFM dialogue

Callouts like "Ra 0.8 µm" or "6061-T651 anodised to Mil-A-8625 Type II" leave room for interpretation. Without upstream DFM review, suppliers substitute process routes that meet spec on paper but fail in application.

DFM / Surface finish
04

Inspection reports lack traceability — no CMM data, no measurement plan

A CoC alone doesn't give your QA team what it needs. Parts arrive without a dimensional report tied to a control plan, making incoming inspection a full re-measurement exercise and blocking assembly line release.

QA / CMM traceability
How we solve it

Precision problems need engineering answers

We don't just machine parts — we work through the failure modes before a single chip is cut.

Engineers discussing 5-axis CNC machining process
Setup consolidation

One setup eliminates datum shift — complex geometry, single clamping

Our simultaneous 5-axis machining centers cut compound angles, deep pockets, and undercuts in a single clamping event. When repositioning is eliminated, tolerance stack-up is eliminated — critical for parts with tight positional callouts across multiple features.

±0.005 mm positional tolerance maintained across all axes in one setup
Compound-angle features, freeform surfaces, 5-sided access — no fixture change
Al 6061/7075 · SS 316/17-4PH · Ti Grade 5 · engineering plastics
First article with full CMM report before production release

CMM inspection of precision machined parts
DFM + quality loop

24H DFM feedback closes the spec gap before you commit to tooling

When we receive your drawing, our engineering team reviews material spec, surface finish callouts, critical GD&T features, and process route before quoting. If a callout is ambiguous or manufacturing-hostile, we flag it — not after the first article, but before the order is placed.

24H DFM response with process risk notes and recommended spec adjustments
Full CMM dimensional report issued with every first article — not just a CoC
ECO absorption: minor design changes handled without schedule penalty up to FAI stage
ISO 9001 certified — documented control plan, inspection records, full lot traceability
Technical parameters

CNC Machining Specifications

Key parameters at a glance — answers to what your engineering team asks before sending an RFQ.

Maximum Part Size
Milling 3000 × 2500 × 900 mm
Turning / grinding: Ø1600 × 16,000 mm — long-shaft capability in-house, no outsourcing.
Tolerance & Surface Roughness
General ±0.005 mm
Surface finish Ra 0.2 – 3.2 µm. Mirror finish and cylindrical grinding for bearing / sealing surfaces.
Machining Axes
3 / 4 / 5-Axis Milling
Simultaneous 5-axis for compound angles and freeform surfaces. Turn-mill centres for single-setup complex parts.
Inspection Equipment
CMM + Full Gauge Suite
CMM, optical projector, surface roughness tester, depth / radius / dial / thread gauges. First-article CMM report on every order.
Threads & Edge Conditions
Standard & Custom Threads
Metric, UNC / UNF, BSP, BSPT and custom forms. Sharp edges chamfered and deburred unless otherwise specified.
Lead Time & MOQ
Prototype 5–7 Days
MOQ = 1 piece. DFM feedback and formal quote within 24 H of drawing receipt. Production runs from 7 days.
What we work with

Materials & Surface Finishes

From certified raw stock to finished surface treatment — everything under one roof, qualified to your drawing.

CNC machining raw materials — aluminium, brass, copper, stainless steel and plastic bar stock
Engineering materials stock
CNC Machining Materials

We stock and machine a broad range of engineering metals and plastics — sourced and certified with full material traceability.

Aluminium Stainless Steel Carbon Steel Alloy Steel Titanium Brass Copper Engineering Plastics
Common certified grades
Al 6061-T6 Al 7075-T651 SS 303 / 304 / 316 SS 17-4PH 42CrMo4 20CrMnTi Ti Gr.5 (6Al-4V) Ti Gr.23 ETP Copper C36000 Brass PEEK Delrin (POM)
Surface Finishes

Post-machining treatment applied in-house or through certified partners. Specify on your drawing or discuss with our engineers — we confirm compatibility before quoting.

Anodising — Type II & III / Hard Coat
Electroplating — Chrome · Zinc · Nickel · Gold
Powder Coating
Bead / Sand Blasting
Polishing & Brushing
Heat Treatment & Case Hardening
Passivation (SS / Ti)
Painting & Engraving
Precision metal surface polishing machine — CNC machined part post-processing and surface finishing
Capability reference

Precision CNC Parts We Machine

A cross-section of milled and turned components — from prototype quantities to high-volume production runs. All parts held to ±0.005 mm with full CMM dimensional reports.

5-Axis Mill CNC machined valve body — precision milled hydraulic component
Valve Body
Material: SS 316 / Al 6061
±0.01 mm port concentricity
5-Axis Mill CNC milled electric motor housing — thin-wall aluminum enclosure
Motor Housing
Material: Al 6061-T6
Hard anodised, bore ±0.01 mm
5-Axis Mill CNC 5-axis milled turbo impeller — complex freeform surface machining
Turbo Impeller
Material: Al 7075 / Ti Gr.5
Freeform blade, Ra ≤ 0.8 µm
Micro Mill CNC micro-milled surgical forceps — medical grade stainless steel instrument
Surgical Forceps
Material: SS 17-4PH
Medical grade, ±0.005 mm
4-Axis Mill CNC milled titanium tibia bone plate — orthopedic implant precision machining
Tibia Bone Plate
Material: Ti Grade 23
Implant grade, full CMM report
3-Axis Mill CNC milled mold test block — hardened tool steel precision cavity
Mold Test Block
Material: P20 / H13 steel
Cavity Ra ≤ 0.4 µm
5-Axis Mill CNC milled RV reducer output flange — precision robotics component
RV Output Flange
Material: 42CrMo4
Bolt circle ±0.005 mm true position
4-Axis Mill CNC milled engine cylinder block — multi-bore precision machining
Engine Cylinder Block
Material: Al A380 / GG25
Multi-bore alignment ±0.01 mm
5-Axis Mill CNC milled spinneret plate — micro-hole array for fiber extrusion
Spinneret Plate
Material: SS 316L
Micro-orifice array, Ra 0.4 µm bore
3-Axis Mill CNC milled EDM copper electrode — die-sinking electrode precision machining
EDM Copper Electrode
Material: ETP Copper
3D profile form tol. ±0.01 mm
CNC Turn CNC turned hydraulic cylinder piston rods — hard chrome plated precision shafts
Hydraulic Piston Rods
Material: 42CrMo4, hard chrome
Runout ≤ 0.005 mm
CNC Turn Precision CNC turned cylinder component — tight-tolerance bore and OD machining
Precision Cylinder
Material: SS 304 / EN19
OD/bore concentricity ±0.005 mm
Turn-Mill CNC turned precision roller component — industrial conveyor and printing roller
Precision Roller
Material: GCr15 bearing steel
Cylindricity ≤ 0.003 mm
CNC Turn Custom CNC machined axle pin with cross-hole — precision dowel and locating pin
Axle Pin with Cross-Hole
Material: SS 316 / 20CrMnTi
Position tol. ±0.008 mm
CNC Turn Precision CNC turned tapered slender shaft — long slender shaft with taper machining
Tapered Slender Shaft
Material: 40Cr / Ti Gr.5
Straightness ≤ 0.01 mm/m
CNC Turn Extra-long precision CNC turned shaft — up to 16m length heavy-duty shaft machining
Extra-Long Precision Shaft
Up to 16 m length
Cylindrical grinding, Ra ≤ 0.8 µm
Turn-Mill Precision CNC turned gear shaft — hobbed gear teeth with precision journal bearing surfaces
Gear Shaft
Material: 20CrMnTi, carburised
Journal ±0.005 mm, gear DIN 6
CNC Turn Precision CNC turned stepped shaft — multi-diameter step shaft for gearbox and motor
Stepped Shaft
Material: 42CrMo4 / EN24T
Step concentricity ±0.005 mm
Turn-Mill Precision CNC turned eccentric shaft — offset journal for pump and compressor applications
Eccentric Shaft
Material: 42CrMo4
Offset ±0.008 mm, dynamic balance
Turn-Mill Precision CNC machined crankshaft — multi-throw crankshaft for engine and compressor
Crankshaft
Material: GGG70 / 42CrMo4
Pin journal ±0.005 mm, ground finish
CNC Turn Precision CNC turned hollow shaft — thin-wall tube shaft for spindle and roller applications
Hollow Shaft
Material: SS 304 / Al 6061
Wall thickness ±0.05 mm
Turn-Mill Precision CNC turned servo motor shafts — high-accuracy motor output shaft batch production
Servo Motor Shafts
Material: 40CrNiMoA
Runout ≤ 0.003 mm, batch ready
Ready to source your next part?
Get Instant Quote — Free
or
projects@precimach.com
NDA available upon request for all projects.
Custom CNC Machining Services
Quote in 24H. Parts in 5–7 Days.
±0.005 mm Tolerance ISO 9001 Certified Full CMM Reports Global Shipping
Ready to source your next part?
Get Instant Quote — Free
or
projects@precimach.com
NDA available upon request for all projects.
Custom CNC Machining Services
Quote in 24H. Parts in 5–7 Days.
±0.005 mm Tolerance ISO 9001 Certified Full CMM Reports Global Shipping
Proven in the field

Engineering Case Studies

Real projects, real challenges, real results — documented so you can evaluate our capability against your own requirements.

CNC Turning
Custom 5040 tapered solid steel baluster shafts — CNC turning slender shaft for US stair contractor by Precimach
Slender shaft · Taper turning
Tapered Steel Baluster Shafts — US Stair Contractor

55 custom solid steel balusters, ~1,000mm length, continuous taper. Local US suppliers declined — vibration and chatter on long tapered shafts exceeded their capability. 20-day DDP deadline.

Custom CNC-integrated hydraulic follower rest — single-pass full-length taper, no polishing
55 pcs · 3 variants · DDP USA · Air freight
Target 20 days → delivered in 13 days
7 days early · 0 rejects · Repeat order followed
CNC Milling · Military
Precision Al 6063-T6 military portable computer mainboard bracket — thin-wall CNC milling zero chatter by Precimach
Thin-wall · Defense electronics
Aluminum Mainboard Bracket — Military Portable Computer

Al 6063-T6 structural bracket for ruggedised military computers. Wall 5.1mm, unilateral tol. 0/−0.05mm, flatness ≤0.1mm, zero chatter. Standard machining practice insufficient.

5-step process: stress relief → rough mill → 24H aging → custom contoured fixture → precision finish
Tol: 5.1mm 0/−0.05mm · Flatness ≤ 0.1mm · Ra uniform
Material: Al 6063-T6 · Feeler gauge fixture verification
100% in-spec · Zero chatter · Zero rework
Aerospace · 5-Axis
UAV planetary gearbox CNC machining — 38mm aerospace rudder control drivetrain AGMA Class 11 by Precimach
5-Axis · Gear grinding · Aerospace
UAV Planetary Gearbox — European Aerospace Client

Rudder control gearbox: 38mm Ø, 12 N·m, backlash ≤3 arcmin, −45°C to +120°C range. 20 validated prototypes needed in 3 weeks — for flight qualification of a European defence UAV programme.

5-axis CNC + AGMA Class 11 gear grinding + Class 10,000 cleanroom assembly + thermal cycling
Backlash: ≤ 2.5 arcmin achieved (spec ≤ 3) · Torque 12 N·m verified
20 units in 2 weeks — 33% faster than target
3-year · 5,000-unit sole-supplier contract awarded
How we prove the part is right

Quality Control & Precision Inspection

Every part ships with documented proof — not just a verbal assurance. Here is exactly what happens between machining and your dock.

Precimach quality control lab — CMM coordinate measuring machine for CNC machined part dimensional inspection
100%
First-article CMM report on every order
0
Parts shipped without passing inspection
ISO 9001
Certified QMS · Full lot traceability
01
In-process dimensional checks during machining
Critical features are measured at the machine mid-operation — not just at the end. Errors are caught and corrected before they compound. This is where most quality escapes are prevented.
02
First-article CMM inspection against your drawing
The first finished piece from every order is measured on our CMM against every callout on your drawing. GD&T features, positional tolerances, bore diameters, surface roughness — each recorded with actual vs nominal values.
03
Batch sampling inspection with statistical traceability
Production batches are sampled per AQL or your specified plan. Every measurement is recorded, lot-traced, and retained. If a question arises about any shipped part, the data exists to answer it.
04
Release hold — nothing ships without sign-off
Parts are held until the QC engineer signs off the inspection record. No part is released on verbal approval or schedule pressure. The inspection report travels with the shipment.
CMM Dimensional ReportAll measured features vs drawing nominal
Certificate of ConformanceISO 9001 signed, lot number referenced
Material Test CertificateMill cert with heat/lot traceability
In-process PhotosAvailable on request for all orders
What our clients say

From Engineers & Buyers Who've Worked With Us

Unedited feedback from procurement managers and engineers across North America, Europe, and beyond.

"

Precimach responded faster than any domestic supplier we'd approached. They kept us informed throughout, delivered a full week ahead of schedule, and the surface finish on the balusters was exactly what we needed for visible architectural installation. We came back for the production run.

CNC Turning · Custom shaft · DDP USA
M.D.
M. D.
Procurement Lead · Stair Installation Contractor · USA
"

Their inspection reports and documentation meet our internal standards — full CMM reports, material certs, CoC with lot traceability. The DFM feedback before production started flagged a tolerancing issue our own team had missed. Working with Precimach has materially reduced our supply-chain risk on these parts.

CNC Milling · Defense electronics · ISO 9001
M.T.
M. T.
Engineering Manager · Industrial Electronics OEM · Texas, USA
"

We moved from prototype to full production without any re-qualification process — the prototype batch and production batches came in dimensionally identical across all critical features. Quality has been consistent across multiple orders. Lead times are reliable. That's all we need from a machining partner.

Prototype → Production · Batch consistency
J.R.
J. R.
Operations Director · Automation Equipment Manufacturer · California, USA
Got questions?

Frequently Asked Questions

Straight answers to the questions engineers and procurement managers ask us most before placing an order.

Prototypes (1–10 pieces): typically 5–7 working days from drawing approval to parts shipped. For straightforward turning or milling in common materials, we often complete in 3–5 days.

Low-volume production (10–200 pieces): 7–15 working days depending on complexity, setup requirements, and surface finish.

Volume production runs: quoted individually — contact us with your annual volume and we'll advise on scheduling and inventory options.

All lead times are from drawing approval, not from enquiry. Our 24H DFM feedback means most orders are in production within 48 hours of first contact.

Prototype: 5–7 days Low-vol: 7–15 days Air freight to USA: +3–5 days

General machining tolerance: ±0.005 mm on standard features. Tighter tolerances (±0.002–0.003 mm) are achievable on specific features with the correct process and fixturing — discuss your requirements during DFM review.

Surface roughness: Ra 0.2 to Ra 3.2 µm. Mirror finish and cylindrical grinding available for bearing and sealing surfaces.

Verification: every first article is measured on our CMM against your drawing. The dimensional report — actual vs nominal for every callout — ships with the parts. We don't release on operator feel; we release on measured data.

General: ±0.005 mm Ra 0.2–3.2 µm CMM report on every order

Accepted formats: STEP (.stp), IGES (.igs), SolidWorks (.sldprt), CATIA, Parasolid — plus 2D drawings as PDF, DWG, or DXF. We can also work from sketches or reference samples for reverse-engineering.

To quote accurately, we need: 3D model + 2D drawing with tolerances, material specification (grade, not just type), surface finish requirements, and target quantity. The more complete your package, the more precise the quote.

If your drawing is incomplete or you're still in design, send what you have — our engineers will work with you to fill the gaps during DFM review.

STEP · IGES · PDF · DWG Quote in 24H

Yes — we sign NDAs before reviewing any drawings or technical information. This is standard practice for all projects, not an optional add-on.

How it works: send us your NDA template and we'll review and return a signed copy, typically within 24 hours. If you don't have an NDA template, we have our own standard confidentiality agreement we can provide.

Drawings and technical data are held internally and are not shared with third parties. All manufacturing is performed in our own facility — we do not subcontract machining work.

We ship worldwide via DHL, FedEx, and UPS air freight. Standard transit time to the US East Coast is 3–5 business days from our facility in Suzhou, China; West Coast is 2–4 days; Europe 4–6 days.

DDP (Delivered Duty Paid) is available to most destinations — we handle export customs in China, international freight, import customs, and local delivery. You receive the parts at your door with no additional charges to manage.

DAP (Delivered At Place) is available if you prefer to handle import duties yourself. We provide a full commercial invoice and packing list for customs clearance.

DDP available USA: 3–5 days air Europe: 4–6 days air

We machine a broad range of engineering metals and plastics. Commonly ordered materials include:

Al 6061-T6 / 7075 SS 303 / 304 / 316 / 17-4PH 42CrMo4 · 20CrMnTi Ti Gr.5 · Ti Gr.23 Copper · Brass PEEK · Delrin (POM)

Material certifications (mill certs) with heat number and lot traceability are provided as standard on all orders. If your application requires specific certifications (RoHS, REACH, DFARS-compliant stock), let us know at the quoting stage.

Non-conforming parts are our responsibility to correct — at no cost to you. Our process is:

1. Documentation first: share your incoming inspection findings with us — photos, measurements, or CMM data. We compare against our outgoing inspection records to identify the discrepancy.

2. Root cause and corrective action: we identify what went wrong in our process and issue a formal corrective action before re-manufacturing.

3. Expedited re-production: replacement parts are prioritised and shipped at our cost. We also cover return freight for the non-conforming batch.

In practice, our first-article CMM verification process means non-conforming deliveries are extremely rare. But when they happen, we don't dispute — we fix.

Minimum order quantity: 1 piece. We routinely produce single-piece prototypes — this is a core part of our business, not an exception we reluctantly accommodate.

For single pieces and very low quantities, unit cost will be higher due to setup time. We'll tell you exactly what drives the cost, and in many cases we can suggest design or process adjustments during DFM review that reduce it without affecting function.

Once your prototype is validated, we retain the process data, fixturing, and inspection plan — scaling to production volumes adds no re-qualification delay.

MOQ: 1 piece No re-qualification for production scale-up

We are ISO 9001:2015 certified — our quality management system covers the full production cycle from order intake through final inspection and shipment. Certification documentation is available on request.

Audits: we welcome customer quality audits, either on-site at our Suzhou facility or via virtual audit (video walkthrough of processes and equipment). Several of our long-term clients conduct annual supplier audits — we support this as part of a normal supply chain relationship.

What we provide with every shipment: CMM dimensional report · Certificate of Conformance · Material test certificate with lot number · In-process inspection records (on request).

Our engineering and project team responds in English within 24 hours on business days — typically much faster. We communicate via email, WhatsApp, or WeChat, depending on your preference.

During production you will receive: confirmation when machining starts, in-process update with photos at key stages (on request), notification when inspection is complete, and tracking information as soon as the shipment is dispatched.

You will not be waiting and wondering. If something comes up mid-production that affects your order — a material lead time, a process question, a design clarification — we contact you immediately rather than making assumptions.

Response: within 24H Email · WhatsApp · WeChat English-speaking team
Free · No obligation · Reply within 24 hours

Send Your Drawing.
Get a Reviewed Quote in 24H —
No Commitment Required

Upload your drawing or STEP file and our engineering team will review it for DFM issues, material suitability, and process fit before sending you a detailed quote. No automated pricing. No sales pressure. Just a clear answer from an engineer.

NDA signed before review ISO 9001 Certified DFM feedback included DDP shipping available
Accepted file formats
STEP · STP · IGS PDF DWG · DXF JPG · PNG XLS · XLSX ZIP · RAR

Multiple files? Compress into a single ZIP before uploading — or send your drawings directly to projects@precimach.com

🔒 Your files are used only to prepare your quote — never shared, never stored beyond project scope. NDA available on request before we review any drawing.
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