Get A Quote

  • English

  • French

  • German

  • Italian

  • Portuguese

  • Russian

  • Spanish

Precision Machining Services

Precision machining services holding ±0.005 mm on metal parts and ±0.01 mm on plastics, measured on a CMM. Every drawing is engineer-reviewed, with no MOQ and a quote within 6 hours.

Get a Quote
  • ±0.005 mm

    Metal Tolerance

  • 6 Hours

    Engineer Quote

  • 3–5 Days

    Prototypes

CNC mill cutting a precision machining services valve body bore
ISO Certified ISO 9001, ISO 13485, AS9100D
Precision machining services finished stainless steel flange on worktable

Precision Machining Service, Inspected and Documented

DEK holds a stated tolerance across the whole run, measures it on a CMM and documents it before parts ship. Standard is ±0.005 mm on metals, ±0.01 mm on plastics and ±0.003 mm on small Swiss-turned features.

High precision work is a sequence: rough on a mill or lathe, then finish critical features by grinding, EDM or jig boring. For the full process range, start at the CNC machining services hub; general tolerances are explained in our guide to ISO 2768.

Why DEK for Precision Machining

Two decades of tight-tolerance work, certified systems and in-house processes behind every precision machining service order.

  • Built on ±0.005 mm Work

    Founded in 2002 making mold core pins, ejector pins and guide bushes, where ±0.005 mm was the entry requirement.

  • Certified by TÜV

    ISO 9001:2015, ISO 13485 and AS9100D certified by TÜV, so medical and aerospace parts ship under audited quality systems.

  • Multi-Process In-House

    Milling, turning, Swiss, EDM, grinding and jig boring under one roof keep multi-process CNC precision machining on one quality record.

  • No MOQ, Fast Lead Times

    No MOQ, prototypes in 3–5 days, small batches in 4–7 days and worldwide shipping in 3–7 days to 2,300+ customers.

Engineer-Reviewed Drawings

An engineer reviews every PDF, STEP, IGES or SLDPRT drawing manually, flags any feature that needs grinding, EDM or a different material, and returns a quote within 6 hours for most parts.

Precision Machining Services by Tolerance

Tolerance tiers, the processes that reach them, the materials that hold them and the controls that keep part 500 equal to part 1.

  • Tolerances
  • Processes
  • Materials
  • Control
  • Inspection

  • Tolerance Tiers in Numbers

    Precision is not a specification: the tier on your drawing is, and it must hold on part 500 as well as on part 1.

    • General ±0.05 mm: standard milling or turning, one setup
    • Precision ±0.01 mm: finishing pass, CMM verification
    • High precision ±0.005 mm: on-machine probing, grinding
    • Ultra precision ±0.003 mm: Swiss, grinding, 100% inspection
    Read ISO 2768 Guide
    Parameter Specification
    General ±0.05 mm (ISO 2768-m / -f)
    Precision ±0.01 mm
    High precision ±0.005 mm
    Ultra precision ±0.003 mm
    Flatness 0.005 mm over 100 mm Surface grinding
    True position 0.01 mm Jig boring or probed 5-axis
    Runout 0.005 mm Grinding between centers

  • Processes That Deliver Tolerance

    High precision CNC machining is a sequence: rough on a mill or lathe, then finish critical features on the process that holds them.

    • CNC milling: prismatic parts, housings, manifolds
    • CNC turning: shafts, bushings, fittings
    • Precision grinding: hardened shafts, gauges, seal faces
    • Gearbox plate: milled, heat treated, ground, jig bored
    Explore Jig Boring
    Parameter Specification
    CNC milling ±0.01 mm; ±0.005 mm on finish
    CNC turning ±0.005 mm on diameters
    Swiss turning ±0.003 mm, features under 10 mm
    Precision grinding ±0.002 mm, Ra 0.2–0.4 µm
    Wire EDM ±0.003 mm, Ra 0.4–0.8 µm
    Jig boring Hole position ±0.003 mm

  • Materials for Precision Machined Parts

    All metals and plastics we machine reach ±0.01 mm; material behavior makes the difference at ±0.005 mm and below.

    • Aluminum 6061, 7075: measured at 20 °C, one-setup finish
    • Stainless 303, 316, 17-4 PH: sharp tooling, consistent feeds
    • Titanium Ti-6Al-4V: rigid fixtures, fresh insert to finish
    • PEEK: conditioned stock, fine finishing passes
    View Metals
    Parameter Specification
    Aluminum 6061, 7075 Expands 23 µm/m·°C
    Stainless steel 304, 316 Work-harden
    17-4 PH Machined after H900 age
    Titanium Ti-6Al-4V Springback, poor heat conduction
    Inconel 718 ±0.01 mm milled, ±0.005 ground
    PEEK ±0.01 mm realistic

  • How DEK Holds ±0.005 mm

    Holding ±0.005 mm depends less on catalogue accuracy than on controlling what moves a dimension after the program is proven.

    • Parts measured at a controlled 20 °C
    • Offsets adjusted at set intervals for tool wear
    • On-machine probing, plug, pin and air gauges
    • Dedicated fixtures, soft jaws, vacuum chucks
    Get a Quote
    Parameter Specification
    Inspection temperature 20 °C
    200 mm aluminum, +10 °C Grows 0.046 mm
    Tool wear Measured at set intervals
    In-process gauging Probing, plug, pin, air gauges
    Thin plates Vacuum chucks

  • Inspection and Documentation

    Every order passes four inspection stages, and the paperwork below ships with the parts on request.

    • Dimensional report keyed to your drawing balloons
    • FAI report on the first batch
    • Material certificates and spectrometer results
    • Photos or videos before shipment
    Meet the QC Team
    Parameter Specification
    IQC Spectrometer vs. certificate
    IPQC Checks at defined intervals
    FAI Every ballooned dimension
    OQC Final inspection before packing
    Equipment CMM, gauges, roughness testers

Precision Machining Services vs. Standard CNC

The equipment is often the same; precision work adds the process around it. Choose it when fit or function depends on the tolerance, and standard machining when ±0.05 mm is enough.

Criteria This ProcessPrecision machining Standard CNC machining Precision grinding Swiss turning
Typical tolerance ±0.005 mm on metals ±0.05 mm ±0.002 mm ±0.003 mm, small features
Process controls Probing, CMM, fixtures One setup, spot checks Finishes critical features 100% inspection at ±0.003
Best for Mating, functional features General tolerances Hardened shafts, gauges Pins, instrument shafts
Choose when Fit or function is critical ISO 2768-m is enough Flatness or runout 0.005 mm Features under 10 mm

Industries That Specify Precision CNC

DEK supports semiconductor equipment, medical devices under ISO 13485, aerospace hardware under AS9100D, robotics, optics, telecom and drones.

  • Aerospace

  • Medical

  • Automotive

  • Robotics

  • Semiconductor

  • Electronic

  • Telecom

  • Drone & UAV

  • Energy

  • Oil & Gas

  • Marine

  • Industrial Equipment

  • Construction

  • Agriculture

  • Consumer Products

  • Military & Defense

  • Mining

Typical Precision Machined Parts

Part families where tight GD&T decides function, and the design choices that decide what that precision costs.

  • Valve Bodies and Spools

    Bore concentricity to 0.005 mm and seat faces ground to Ra 0.4 µm, in 316 stainless, 17-4 PH or brass.

  • Optical Mounts and Stages

    Flatness 0.005 mm and hole position ±0.01 mm, in 6061 aluminum or Invar for thermal stability.

  • Medical Instrument Parts

    Swiss-turned shafts and cannulas to ±0.003 mm in 316LVM and Ti-6Al-4V, produced under ISO 13485.

  • Semiconductor Fixtures

    Aluminum plates ground flat and parallel, with positional tolerances held across 500 mm spans.

  • Gearbox Components

    Housings jig-bored for bearing seats, shafts ground for runout and gears cut in-house.

Where Tight Tolerance Costs

  • Cost Per Tolerance Tier

    Each tier roughly doubles machining and inspection time on the affected feature; ±0.003 mm usually adds 100% inspection and a second process.

  • Blanket Tolerances

    Tight tolerance across the whole drawing is the largest avoidable cost in quotes. Apply it to mating and functional features; let ISO 2768-m cover the rest.

  • Surface Roughness Callouts

    Call out roughness only where sealing, sliding or optical function demands it. Saying what the part does lets an engineer suggest a looser tolerance.

  • Clamping Distortion

    The most common reason a ±0.005 mm part measures fine on the machine and wrong on the CMM; dedicated fixtures and soft jaws bored in place prevent it.

Certified Precision, Documented

ISO 9001:2015, ISO 13485 and AS9100D certified by TÜV, with FAI and CMM reports.

  • AS9100D and ISO 9001 certification logo
    AS9100D

    Aerospace Quality Management System

  • ISO 9001 certification logo
    ISO 9001:2015

    Quality Management Standard

  • ISO 13485 certification logo
    ISO 13485

    Medical Devices Quality Management

Metals and Finishing for Tight Tolerance

The metals most often specified at ±0.005 mm, and the CNC machining + finish steps that hold critical features.

Metals

Surface Finishes

Material not listed? Ask an engineer to review it.

View All

From Drawing to Inspected Parts

  • 1

    Send Your Drawing

    PDF, STEP, IGES or SLDPRT file with tolerances and GD&T clearly marked.

  • 2

    Engineer Review

    Each drawing is reviewed manually; features needing grinding, EDM or another material are flagged.

  • 3

    Quote in 6 Hours

    Quote returned within 6 hours for most parts, covering the whole process sequence.

  • 4

    Precision Production

    Milling or turning, then critical features finished by grinding, EDM or jig boring.

  • 5

    Inspection & Shipping

    IQC, IPQC, FAI and OQC, then worldwide shipping in 3–7 days.

Precision Machining FAQs

Answers on tolerance, inspection reports and the cost of precision machined parts.

What tolerance can precision machining services hold?
DEK holds ±0.005 mm as standard on machined metal parts and ±0.01 mm on plastics. Ground features reach ±0.002 mm, and small Swiss-turned features can hold ±0.003 mm. The achievable tier depends on material, feature size and geometry, and is confirmed during the engineering review of your drawing.
What is the difference between precision machining and standard CNC machining?
The equipment is often the same; the difference is the process around it. Precision work adds separate finishing passes, temperature-controlled measurement, in-process gauging, purpose-built fixtures and full CMM documentation. Standard machining to ±0.05 mm skips most of those steps, which is why it costs less.
Do I get an inspection report with precision machined parts?
Yes. On request, every order ships with a dimensional report keyed to your drawing balloons, and the first batch includes a first article inspection report. Material certificates, spectrometer results and pre-shipment photos are also available.
How does tolerance affect the cost of precision CNC machining?
Each tighter tolerance tier roughly doubles machining and inspection time on the affected feature, and ±0.003 mm usually requires a second process such as grinding. Applying tight tolerance only where the part needs it is the most effective way to keep cost down.

Request a Precision Machining Quote

Send your drawing with GD&T marked for our precision CNC machining services. An engineer reviews it and quotes within 6 hours for most parts.

  • PDF, STEP, IGES or SLDPRT files accepted
  • No minimum order quantity
  • Prototypes in 3–5 days
  • Small batches in 4–7 days
  • FAI and CMM reports on request
Request an Aerospace Quote

    Related Capabilities

    Ready to Scale Your Project?

    Get started with a stable process and controlled quality. Let's discuss your project.

    Machined aluminum engine block with threaded holes and smooth finish
    • Sealy logo
    • Bosch logo
    • Samsung logo
    • Schneider Electric logo
    • Siemens logo
    • CHINT logo
    • Shell logo
    • China Southern Power Grid logo
    • Sealy logo
    • Bosch logo
    • Samsung logo
    • Schneider Electric logo
    • Siemens logo
    • CHINT logo
    • Shell logo
    • China Southern Power Grid logo