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Precision CNC Drilling Services

DEK's CNC drilling services hold dowel hole true position to ±0.005 mm in 50+ metals and plastics. Holes are cut in the same setup as milling or turning, with no MOQ.

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  • ±0.005mm

    True Position

  • 3 Days

    Fastest Prototype

  • 98.6%+

    On-Time Delivery

CNC drilling services machining a dowel hole in stainless steel bracket
ISO Certified ISO 9001, ISO 13485, AS9100D
Finished CNC drilled flange with counterbored mounting holes on dark table

Precision Hole Drilling for Milled and Turned Parts

DEK drills through holes, blind holes, positioning/dowel holes, and counterbore or countersink features in 50+ metals and engineering plastics. Holes are cut on the same datum as the surrounding CNC milling or CNC turning operation.

Position tolerance carries through the whole part instead of resetting for a separate drilling pass. There is no MOQ, prototypes ship in as fast as 3 days, and our engineers confirm hole tolerance, material, and lead time before you commit, with general dimensions per ISO 2768.

Why Choose DEK for CNC Drilling

Drilled holes are usually one feature inside a larger milled or turned part. Here is why OEM buyers trust DEK with them.

  • 20+ Years of Machining

    DEK has run precision machining for 20+ years, producing 1.2M+ parts annually for 2300+ global OEM clients across Europe and North America.

  • 98.6%+ On-Time Delivery

    Prototype lead time runs as fast as 3 days; production lead time is confirmed once hole count, material, and tolerance are set.

  • Same Setup, Same Datum

    Drilling runs on the same setup, datum, and inspection pass as the rest of the component, so there is no separate alignment error to track.

  • No Minimum Order Quantity

    Order a single prototype or a production run: there is no minimum order, and every quantity gets the same engineer-reviewed drawing check.

Engineer-Reviewed Drawings

Our engineers flag holes beyond a 10:1 depth-to-diameter ratio, very small diameters in hard alloys, and cross-holes near thin walls, then confirm tolerance, material, and lead time before pricing.

CNC Hole Drilling Services Capabilities

Hole type drives tooling, setup, and inspection method. We select the drilling sequence around what your drawing calls for.

  • Hole Types
  • Tolerances
  • Depth & Size
  • Cross-Holes
  • Quality

  • Through, Blind & Counterbore Holes

    Full-depth and controlled-depth holes for fasteners, standoffs, ventilation, and weight reduction, cut on 3-, 4-, and 5-axis platforms.

    • Through holes in the same setup as milled features
    • Blind holes where a through hole would hurt sealing
    • Counterbores and countersinks seat fastener heads flush
    • Threads routed to tapping services
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    Parameter Specification
    Through hole tolerance ISO 2768 unless tighter callout
    Blind hole bottom Conical unless flat-bottom callout
    Counterbore callout Diameter and depth
    Countersink callout Included angle and depth
    Platforms 3-, 4- and 5-axis CNC

  • Hole Tolerance and Position Specs

    Positioning and dowel holes control assembly alignment and repeatable fixturing, so location matters as much as diameter.

    • True position and coaxiality to ±0.005 mm
    • Profile-controlled features on 5-axis machining
    • Micro holes on small parts to ±0.003 mm
    • H7 bores finished by a boring or grinding pass
    Tolerance Guide
    Parameter Specification
    Dowel hole true position ±0.005 mm
    Fit-critical coaxiality ±0.005 mm
    5-axis profile hole features ±0.01 mm
    Micro holes (sub-10 mm parts) Down to ±0.003 mm
    Through / blind holes ISO 2768 general classes
    H7 fit bores Via grinding or boring pass

  • Hole Depth and Part Size Limits

    Achievable hole size depends on depth, diameter, material, and tool access, so we confirm limits during drawing review.

    Deep Hole Drilling
    Parameter Specification
    Max depth-to-diameter ratio Up to ~10:1
    Max part size Up to ~1000 mm
    Min/max drill diameter Confirmed on drawing review
    Bore surface finish (Ra) Confirmed on drawing review
    Minimum order No MOQ

  • Cross-Holes on Turned Parts

    On turned components, we drill cross-holes into the OD or either face without a second setup, tied to the turning datum.

    • On-center and off-center cross-holes
    • Hole position and runout on one datum
    • Turned side handled by CNC turning services
    Get a Quote
    Parameter Specification
    Cross-hole types On-center and off-center
    Drilled surfaces OD or either face
    Setups No second setup
    Reference datum Same as turning operation

  • Inspection of CNC-Drilled Holes

    Every drilled feature moves through documented QMS stages, with in-house CMM inspection against the drawing.

    • IQC, IPQC, FAI, OQC, SPC and CAPA stages
    • CMM checks hole position, diameter and depth
    • Full traceability documentation to shipment
    Our QC Team
    Parameter Specification
    QMS stages IQC, IPQC, FAI, OQC, SPC, CAPA
    Inspection equipment In-house CMM
    Checked features Position, diameter, depth
    Traceability Full, through to shipment
    Certifications ISO 9001, AS9100D, ISO 13485

CNC Drilling vs. Other Hole-Making Processes

Choose CNC drilling for plain holes up to about 10:1 deep; switch process for deeper holes, threads, or H7 fit bores.

Criteria This ProcessCNC Drilling Deep Hole Drilling Tapping Boring / Grinding
Best for Through, blind, dowel holes Long, straight holes Internal threads H7 fit bores
Depth-to-diameter Up to ~10:1 Beyond ~10:1 Per thread callout Follow-up on drilled bore
Typical tolerance ±0.005 mm true position Confirmed on review Confirmed on review H7 fit class
Limiting factor Tool access, material Straightness, coolant Thread tooling Fit class on drawing
Choose when Plain hole in same setup Hole exceeds 10:1 Hole needs threads Bore needs a press fit

Drilled Parts for Every Industry

We drill parts for aerospace (non-flight-critical), medical devices, robotics, semiconductor equipment, automation, and automotive programs.

  • Aerospace

  • Medical

  • Automotive

  • Robotics

  • Semiconductor

  • Electronic

  • Telecom

  • Drone & UAV

  • Energy

  • Oil & Gas

  • Marine

  • Industrial Equipment

  • Construction

  • Agriculture

  • Consumer Products

  • Military & Defense

  • Mining

Hole Features and Challenges We Solve

From micro holes to large plates, these are the hole features our engineers drill and the drawing risks we flag early.

  • Blind Holes

    Controlled-depth holes for standoffs and sealing faces. Conical bottom by default, flat bottom when the drawing calls it out.

  • Counterbores & Countersinks

    Recessed seats for flush fastener heads: counterbores defined by diameter and depth, countersinks by included angle and depth.

  • Dowel & Locating Holes

    True position and coaxiality between mating dowel and locating-pin holes held to ±0.005 mm for repeatable alignment.

  • Micro Holes

    Holes in sub-10 mm parts down to ±0.003 mm through our micro machining setup.

  • Holes in Large Parts

    Drilling on parts up to about 1000 mm, run with our large part CNC machining capacity.

  • Multi-Face Hole Patterns

    Holes on several faces cut on 4- and 5-axis platforms, with profile features held to ±0.01 mm.

Hole Features We Flag Early

  • Holes Beyond 10:1

    Depth-to-diameter ratios beyond roughly 10:1 limit straightness and coolant delivery, so they route to deep hole drilling.

  • Small Holes in Hard Alloys

    Very small diameters in titanium or Inconel run slower and wear tooling faster; we confirm tolerance and lead time before pricing.

  • Cross-Holes Near Thin Walls

    Cross-holes located close to thin walls are reviewed on the drawing so tolerance and lead time are confirmed before quoting.

  • Finish-Free Bores

    Press-fit or threaded holes that must stay uncoated are flagged before anodizing, plating, or powder coating is applied.

Certified Quality on Every Hole

Drilling runs under our ISO 9001, AS9100D, and ISO 13485 certified quality system.

  • 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

50+ Materials for Drilled Parts

Hard alloys hold tighter position but run slower than aluminum or plastics. We drill across our full metal and plastic range.

Metals

Surface Finishes

Engineering Plastics

Need another material or finish? Talk with our engineers.

All Materials

How to Order CNC-Drilled Parts

  • 1

    Upload CAD & Drawing

    Send a 3D CAD file and a 2D drawing calling out hole diameter, position, and depth.

  • 2

    Flag Tight Tolerances

    Mark any tolerance tighter than ISO 2768 general classes, plus H7 fits and finish-free bores.

  • 3

    Engineer Review

    Engineers check deep holes, small diameters in hard alloys, and cross-holes near thin walls.

  • 4

    Confirmed Quote

    Tolerance, material, and lead time are confirmed before a price is quoted.

  • 5

    Drill, Inspect, Ship

    Holes drilled in the part setup, CMM-inspected, and shipped with traceability documents.

CNC Drilling FAQs

Answers on hole tolerance, design review, and lead time for drilled parts.

What tolerance can CNC drilling hold?
Through and blind holes hold general tolerance per ISO 2768 unless a tighter callout is specified. Positioning holes and fit-critical bores hold true position and coaxiality to ±0.005 mm; 5-axis hole features hold ±0.01 mm profile, and micro holes in sub-10 mm parts reach ±0.003 mm.
What hole features need design review before quoting?
Holes beyond roughly a 10:1 depth-to-diameter ratio, very small diameters in hard alloys like titanium or Inconel, and cross-holes close to thin walls are flagged during drawing review so tolerance and lead time are confirmed before pricing.
How fast can CNC-drilled parts be delivered?
Prototype lead time runs as fast as 3 days. Production lead time depends on hole count, material, and tolerance, and is confirmed once your drawing and quantity are reviewed. Request a quote for a firm date on your part.

Request a Quote for CNC Drilling Services

Send your 3D CAD file and 2D drawing. Our engineers confirm hole tolerance, material, and lead time before quoting a price.

  • Prototypes in as fast as 3 days
  • No MOQ, from one part to production
  • True position held to ±0.005 mm
  • 50+ metals and plastics drilled
  • CMM inspection with full traceability
Request an Aerospace Quote

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