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high tolerance high precision cnc machined parts

CNC Precision Parts,
To Spec To Tolerance

High precision plastic and metal
parts & prototypes delivered fast

Lead times from 4 days
3, 4 and 5 axis machines available
100+ machines available
Many metal and plastic materials available
ISO and IATF certified
Using cnc milling for rapid prototyping

CNC Milling

We have 3, 4 and 5-axis machining capabilities
for simple and complex geometries, holding dimensions to tolerances as tight as 0.002”.
Custom cnc turning services with rapid lead times

CNC Turning

We have CNC turning capabilities for custom precision threads, deep holes, and all types of intricate cylinder and round shapes.
Custom CNC machining services with the use of EDM


We have electrical discharge machining (EDM) capabilities suitable for producing deep pockets, creating complex features, and cutting the hardest metals with great precision.

Our Custom CNC Machining Services

Over 100 high precision CNC mills, lathes, countersinks, wire EDMs, and surface grinding machines help us deliver custom parts for many industries. Our massive in-house capacity means that you are at the front of the line every time, whether you need a one-off prototype or low-volume production parts in the tens of thousands.

Our CapabilitiesDescription
Machine size3000 x 1200 x 850 mm
Materials50+ metals, plastics, carbon fibre
Standard tolerance±0.05mm (metals), ±0.2mm (plastics)
Lead timeFrom 4 days

5 axis machining

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CNC Machining Materials


PMMA is known as a 50% lighter, clearer, more affordable, shatter-resistant alternative to glass. CNC machined PMMA or acrylic is commonly used for automotive lights and windows to smartphones screens.
Material Reference
Translucent, Black PMMA
Translucent, Black
HLH Rapid employee CNC machined transparent PMMA acrylic part


HDPE is an engineering plastic that offers excellent machinability. It has a high strength-to-density ratio and high durability. It's known as one of the most versatile plastic materials and is used for a wide range of applications.
Many Colors
CNC machined HDPE part with a deburr finish


PTE is a clear, strong and lightweight material that is very well suited for applications where complex parts and high dimensional accuracy and surface quality are needed.
CNC machined small PET material part


Polycarbonate (PC) material has high impact resistance, wear resitance and can withstand functional testing. CNC machined transparent and opaque PC parts are commonly used in the medical, automotive, telecommunications industries.
Material Reference
Translucent PC, Black PC, Fireproof Black PC V0, PC+ABS
Black, Translucent (or polished transparent)
PC Material CNC Part


PE is a strong durable, light-weight and flexible material. It is known as a 'safe' choice and can be machined for a wide variety of applications.
Material Reference
PE, HDPE, LDPE, White PE+15%GF


PVC is a durable material that can be easily machined, is resistant to weathering and chemicals and doesn't conduct electricity. This makes it widely used in applications, such as pipes, medical devices and electronics.
Lacquered appearance, comes in many colors
CNC machined pvc material part with a smooth surface finish


Bakelite is a castable, fire-resistant plastic. It is lightweight, durable, and can be molded into nearly infinite shapes. Bakelite is popularly used for industrial purposes and making jewellery.
Many Colors
CNC machined bakelite part


PEEK is a tough, rigid, high performance engineering plastic with outstanding resistance to harsh chemicals and high temperatures. CNC machined PEEK is excellent for high precision aerospace and automotive parts.
Material Reference
Colourless, Light brown
PEEK Material CNC Part With Smooth Finish


Polypropylene (PP) is a cost-effective CNC machining plastic that is durable, robust and resistant to many external factors. It is the second most extensively used plastic and is often known to be one of the safer choice.
Many Colors
CNC machined PP material part with smooth finish


PBT, or polybutylene terephthalate, is a high strength and high rigidity plastic with stable electrical properties. CNC machined PBT parts are commonly used in the automotive and electronics industries.
White to Bright Colors
PBT Material CNC Machined Part


PTFE is a soft, low friction material with excellent chemical and weathering resistance. It is commonly used to make non-stick coating in kitchen cookwares, bearings, slide plates and many other components.
Black, Grey
CNC machined PTFE material poles with smooth finish


ABS is an extremely rigid, versatile thermoplastic with fantastic chemical and weather resistance, making it great for outdoor applications like automotive acessories and aircraft panels.
Material Reference
White ABS, Black ABS, Cream ABS, Fireproof ABS
White, Black, Cream, Milky
ABS material CNC machined parts with smooth finish


PEI is an amorphous thermoplastic with high mechanical strength and exceptional mechanical, thermal and electrical properties. PEI is often CNC machined to make make reusable medical devices such as stopcocks, instrument trays, and pipettes.
Translucent and Amber
CNC machined PEI material for the medical industry


POM is a high crystaline, high-performance plastic with high rigidity, high mechanical strength and excellent wear resitance. It is commonly used in automotive parts, consumer goods and electronics.
Material Reference
White POM, Black POM, Anti-static Black POM
White, Black
CNC machined POM material parts


We have 15+ years of experience in machining strong, light and cost-efficient Aluminium components for the aerospace and aviation, automotive, consumer electronics and many more industries.
Material Reference
AL7075, AL7075 T6/T7351, AL2024 T3/T4/T351, AL2024 T351/T6, AL6061, AL6061 T6/T651, AL5052 H32, AL5082, AL5083, AL2017,AL2017 T351/T4, ADC12, A380, LM24
Silvery White
CNC machined aluminium parts with bead blasted finish


Copper is a soft metal that can be easily shaped through CNC machining, and it has excellent electrical and thermal conductivity.
Material Reference
Pure Copper, Brass, Beryllium Copper, Bronze, Beryllium Bronze, Phosphor Bronze 510
Pinkish Orage, Reddish Brown, Reddish-Gold, Yellow
CNC machined red copper part


While steel is not corrosion resistant and it be tricky to machine, it is stronger and cheaper than stainless steel, making it ideal for toxic, long-lasting, durable cookware and many other applications.
Material Reference
Steel 45#, Alloy Steel, Spring Steel, Bearing Steel, Mild Steel, Cold Roll Steel, Tool Steel, 41CrALMo7, Magnetic Steel, Steel8620, Steel4130, Steel9310, Steel1018, Steel1010
CNC machined steel part with painted finish

Stainless Steel

Stainless steel is an incredibly versatile metal and is often used for CNC machining in the aerospace, automotive and medical industries. It is strong and highly resistant to corrosion and rust.
Material Reference
174PH, SS201, SS202, SS301, SS303, SS304, SS304L, SS316, SS321, SS310S, SS401, SS409, SS410, SS416, SS4140, SS4340, SS455, SS630, SS316L
CNC machined stainless steel part with a deburr finish
PMMA HDPE PET PC PE PVC Bakelite PEEK PP PBT PTFE ABS PEI POM Aluminium Copper Steel Stainless Steel

CNC Surface Finishing Options

We have 15+ high quality chemical and mechanical finishing options available for CNC metals and plastics.

CNC milled part with a brushed finish and laser etched text

CNC Machining Case Study

“What I personally value in our cooperation with HLH is that they’re able to produce what we need, and we don’t need to conform to lower standards.” — Daniel Droźdź, CAD engineer of Smartflyer

Prototype and Production Parts in Days

We understand the needs of engineers and industrial designers. When it comes to precision machining, our approach is: deliver parts fast without compromising on quality.

CNC Machining Services

Precision Machining Tolerance

At HLH, tolerances are controlled to ISO-2678 Fine (F) for metals and Medium (M) for plastics as standard. Tighter tolerances available on request.


Metals With DrawingMetals No DrawingPlastics With DrawingPlastics No Drawing
Linear Dimension±0.01mmISO 2768 Fine±0.05mmISO 2768 Medium
Hole Diameters±0.008mmISO 2768 Fine±0.05mmISO 2768 Medium
Shaft Diameters±0.004mmISO 2768 Fine±0.05mmISO 2768 Medium

Design For CNC Machining

To achieve better part quality and dimensional accuracy, it is important that your CNC model closely follows a set of geometric recommendations. Learn how to design threads, cavities, internal edges and more.

CNC designs
HLH Changes The Prototyping Scene For Joost Engines 2

Why CNC Machining

CNC vs 3D Printing
Compared with parts manufacturing through additive methods, CNC machined parts are functionally stronger and typically have superior production quality and finish. Thus, CNC machining is typically used in the mid to late stages of product development when parts are ready to be tested for functional accuracy.

Custom CNC Machining is Used For
High precision parts and rapid prototyping metal parts, performance plastics, and rapid low-mid volume production runs. When it comes to CNC machining, we provide highly flexible rapid low volume manufacturing solutions that deliver superior parts, fast.

Advantages of CNC Machining

  • Fast and repeatable
  • Delivers on precise and high tolerance specifications
  • Wide range of metal and plastic materials
  • Little room for human error

CNC Machining FAQs

CNC (or computer numerical control) machining is a subtractive manufacturing process in which pre-programmed software and code dictates the movements of factory tools and machinery. It delivers high speed, high precision, and robust manufacturing solutions. You take a block or billet of material and cut away at it with a series of tools and drill bits, removing material to make CNC machined parts.

CNC parts could cost from as low as $100, or as high as $1000 or more. The price depends on the material, tolerance, machining hours, geometrical complexity, part size or quantity.

The two primary CNC machining processes are CNC turning and CNC milling.

  • CNC milling shapes out of a metal or plastic material blank that is usually flat, holding dimensions to tolerances as tight as 0.002”.
  • CNC turning rotates the part when machining the desired shape, which results in cylindrical parts.


At HLH, we use a third CNC machining process known as EDM or electrical discharge machining.

  • EDM also known as spark machining, uses thermal energy instead of mechanical force to remove material from a workpiece. It is often used to produce sharp internal corners or particularly deep cavity.

Many industries rely on CNC machining for high-precision parts and prototypes, including:

  • aerospace & defense
  • automotive
  • electronics
  • robotics
  • medical
  • oil & gas

For features left unspecified, standard tolerances are used. The standard machining tolerance is ISO 2768 Fine (F) for metals and Medium (M) for plastics. Tighter tolerances are available on request.

Generally, we would recommend CNC machining parts over 3D printing, as CNC machined parts are functionally stronger than those 3D printed and typically have superior production quality. This is why CNC machining is typically used in the mid to late stages of development, when parts are ready to be tested for functional accuracy.

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