PARTS IN  1-3 DAYS

Quick-Turn Milled Parts

We don’t have minimums, we love complex jobs, we deliver the best parts for your money and we hit your deadlines!

“We are extremely happy with the quality of parts
received as well as the level of service…Thanks!”
–Micah H., VP Product Development

“Finding Prototek by chance was like hitting
the Strategic Sourcing Easy Button.”
Brian H., Senior Designer

“On time and to Spec. To EVERYONE involved
producing quality parts a hearty thanks.”
Jim T., Senior Product Engineer

“Fastest quoting & delivery I’ve ever
experienced, & the parts look great!”
John H., Lead Mechanical Engineer

Amazing companies choose PROTOTEK for high-quality parts done fast!

Licenses, certifications
and real milled parts service

Expertise and quality are paramount. With more than three decades of experience milling parts, we’ve achieved a rich set of certifications and provide high-touch attention and service to every quote – and every job.

We work differently than other services and ask questions to help our customers build better and more cost-effective parts before we start manufacturing. We want to be your one-stop shop for milled parts, so we focus on doing every part, even ones that other companies ‘No Bid’ for complexity. Most of our business is from returning customers and to achieve that, we strive to hit our customers deadlines across all project types.

iso certification intertek

certifications sam

Prototek FAB 40 2020 award

D&B Number Prototek

Milled Parts – Working with PROTOTEK

Deep capabilities in sheet metal and machining – design, parts milling, manufacturing, finishing, and even complex assemblies.

What do we do?

  • Sheet Metal Parts & Assemblies in as Fast as 1-3 Days
  • CNC Milled and Turned Parts in as Fast as 1-3 Days
  • Complex Parts
  • Same Day or Emergency Jobs – Call us Now!

About our fast, flexible personalized service:

  • ISO-9001:2015 Certified, ITAR Registered
  • Quotes within 24 Hours – Call us if you need it faster!
  • Estimates with or without CAD Models
  • We Want Complex Jobs – We Quote Parts Others Reject

Because every job is unique, and many require special considerations for materials, finishing, custom work, and/or urgent delivery – our milled parts quotes are turned around by seasoned estimators who confirm all aspects of your job. No automated quoting that works on cookie-cutter algorithms here to limit your project or your imagination. We figure out the best way to run your job first – and that’s why we deliver so many jobs that other shops turn away.

Our milled parts capabilities start below but they don’t stop there. Want to talk to someone about a job, upload a file for quote or call us now.

NO CAD MODEL, NO PROBLEM
QUOTES WITHIN 24HRS

PARTS & ASSEMBLIES – ONE STOP SHOP

NO ORDER TOO SMALL

EXPEDITED PARTS IN 1-3 DAYS

Why Prototek?

PROTOTEK's Capabilities

Sheet Metal

  • Manufacturing Design Assistance
  • Laser Cutting - Punching
  • Material Graining
  • Drilling - Countersinking - Tapping
  • Forming - Bending
  • Hardware Insertion
  • Mechanical Assembly
  • TIG, MIG, Spot Welding & Weld Grinding
  • Welded Assemblies & Frames

Machining

  • Up to 5-Axis Milling
  • Horizontal & Vertical Milling
  • 9-Axis Mill-Turn
  • Turning
  • CNC Routing
  • Surface Grinding
  • Lapping & Polishing
  • Welding / Post-Weld Machining
  • Heli-Coils / Hardware Inserts

Cutting & Engraving

  • Wire EDM Cutting
  • Waterjet Cutting
  • CO2 Laser
  • Fiberoptic

Quality Assurance

  • Quality Engineering Assistance
  • CMM Inspection Services
  • First Article and AQL Inspections
  • Compliance and Document Control

Plastic & Composite Fabrication

  • Plastic Thermoforming - Bending
  • Annealing
  • Cryogenic Deflashing & Deburring
  • Plastic Welding
  • Thermal, Adhesive, & Mechanical Bonding
  • Vapor Polishing
  • Radiological Film-Cutting Services

Assembly

  • Manufacturing Design Assistance
  • Tooling and Fixture Fabrication
  • Electro-Mechanical Services
  • Welded, Mechanical, & Small Parts Assembly
  • Wire Harnessing
  • Laser Cutting – Polymers & Metals
  • Insert Installation

Finishing

  • Powder Coating
  • Painting
  • Chemical Agent Resistant Coating
  • Silk Screening
  • Laser Engraving
  • Chem Film
  • Anodizing
  • Black Oxide
  • Bead Blasting
  • Tumbling

An Intro to Milling & Milled Parts

Milling is the process of removing material from an object using cutting devices that spin around a workpiece. A milling machine removes metal from a workpiece by placing it against a rotating multipoint cutter that can cut the workpiece at varying directions and angles to achieve the desired cuts and look/dimensions of the final part.

What are Milled Parts?

Milled parts are workpieces and components that heavily rely on the use of a milling machine. Because of the specific design and/or cuts required with a workpiece, milling may be the primary method required to produce the part. Milled parts are used in various industries like marine, medical, automotive, appliances, telecommunications and electronics. Milled parts are created from diverse materials like stainless steel and titanium, which meet the manufacturer’s standard.

How Milling Differs from Turning and Boring

Milling is a mechanical process where a milling machine removes materials from an immobile workpiece with a rotating cutting tool. The principle of this machine process is similar to turning, which is a process where the cutting tool presses against a workpiece to remove materials from it. The difference between the two is in the use of rotation. In milling, the cutting tool rotates. With turning, the workpiece rotates.

Boring is another machining process that uses a lathe to cut. For both turning and boring, the lathe’s stationary cutting tool presses against a rotating workpiece. The difference between them is that turning involves removing material from a workpiece externally, while boring’s operation is to remove materials from a workpiece internally. Plus, boring is used to expand pre-drilled holes in a workpiece by removing material from the hole’s inner walls.

Milled Parts Materials and Material Characteristics

Milled parts can be made from a variety of materials. The best option will depend on the requirements of your specific project. Materials include:

Milled Parts MaterialsGrade / AlloyHeat TreatableTensile Strength (Ultimate, PSI)Fatigue Strength (PSI)Hardness (Brinell)Milled Parts Machinability
 (AISI Rating)
Milled Parts MaterialsGrade / AlloyHeat TreatableTensile Strength (Ultimate, PSI)Fatigue Strength (PSI)Hardness (Brinell)Milled Parts Machinability
 (AISI Rating)
Aluminum 1100-0 No 13000 5000 23 360%
Aluminum 1100-H112 No 13000 4600 23 360%
Aluminum 1100-H14 No 18000 7200 32 360%
Aluminum 2011-T3 Yes 52000 1800 95 360%
Aluminum 2011-T451 Yes 45000 11000 95 360%
Aluminum 2024-0 Yes 27000 13000 47 360%
Aluminum 2024-T3 Yes 63800 20000 120 360%
Aluminum 2024-T351 Yes 57300 20000 120 360%
Aluminum 2024-T3511 Yes 67000 18000 120 360%
Aluminum 2024-T4 Yes 45000 20000 120 360%
Aluminum 2024-T851 Yes 75000 20000 140 360%
Aluminum 3003-H14 No 23000 8700 42 360%
Aluminum 3003-H22 No 20000 10000 37 360%
Aluminum 5052-0 No 28000 16000 47 360%
Aluminum 5052-H112 No 29000 11000 55 360%
Aluminum 5052-H32 No 34000 17000 60 360%
Aluminum 5052-H34 No 37000 18000 68 360%
Aluminum 5083-H112 No 44000 16000 75 360%
Aluminum 5083-H116 No 47000 23000 83 360%
Aluminum 5086-H111 No 40000 15000 65 360%
Aluminum 5086-H112 No 39000 14000 69 360%
Aluminum 5086-H116 No 44000 22000 81 360%
Aluminum 6020-T8 Yes 43900 N/A 100 360%
Aluminum 6061-T6 Yes 45000 14000 93 360%
Aluminum 6061-T651 Yes 46000 14000 93 360%
Aluminum 6061-T6511 Yes 42000 15000 95 360%
Aluminum 6063-T52 Yes 25000 9700 60 360%
Aluminum 6262-T9 Yes 57000 13000 120 360%
Aluminum 7050-T7451 Yes 76000 30000 140 360%
Aluminum 7050-T7651 Yes 80000 31000 147 360%
Aluminum 7075-T6 Yes 83000 23000 150 360%
Aluminum 7075-T651 Yes 80000 23000 150 360%
Aluminum 7075-T73 Yes 72000 23000 140 360%
Aluminum 7075-T7351 Yes 73000 24000 140 360%
Aluminum 7475-T7351 Yes 72000 28000 135 360%
Aluminum K100-S No 41000 N/A 70 450%
Aluminum M-1 No 42900 N/A 85 450%
Aluminum MIC-6 No 23900 N/A 65 450%
Bearing Bronze C93200 No 34800 16000 65 70%
Brass C26000 No 46000-99000 14000 210 30%
Brass C36000 No 4800-77000 16000 78 100%
Brass C46400 No 55000 - 88000 14500 82 30%
Bronze C31400 Yes 40000-60000 N/A 56-59 80%
Carbon Steel A36 Yes 80000 N/A 119-159 72%
Copper C11000 No 25000-29000 11000-17000 82-92 60%
Copper C14500 No 47900 13000 60-130 85%
Phosphor Bronze C54400 No 47000-100000 N/A N/A 80%
Silicon Aluminum Bronze C64200 No 75000-102000 50000 N/A 60%
Stainless Steel 15-5PH Yes 115000-190000 95000-160000 255-388 45%
Stainless Steel 17-4PH Yes 115000-190000 75000-90000 255-388 45%
Stainless Steel 17-7PH Yes 170000 42000 180 75%
Stainless Steel 303 Yes 87000-100000 33000-52000 170-210 75%
Stainless Steel 304 Yes 84000-170000 30000-63000 170-360 40%
Stainless Steel 304L Yes 78000-170000 25000-62000 160-350 40%
Stainless Steel 316 Yes 76000-170000 30000-63000 160-360 36%
Stainless Steel 316L Yes 77000-170000 25000-65000 170-350 36%
Stainless Steel 321 Yes 85000-10000 32000-40000 170-210 36%
Stainless Steel 347 Yes 89000-100000 32000-40000 160-201 36%
Stainless Steel 410 Yes 76000-110000 28000-50000 190-240 54%
Stainless Steel 416 Yes 75000-120000 33000-50000 230-320 50%
Stainless Steel 420 Yes 100000-250000 33000-97000 190 50%
Stainless Steel 420F Yes 110000 39000 230 68%
Stainless Steel 430 Yes 75000 45000 160 66%
Stainless Steel 430F Yes 79800 30000 170 75%
Stainless Steel 440C Yes 100000-290000 38000-120000 222 40%
Steel 1018 Yes 63000-70000 26000-38000 130-140 78%
Steel 1045 Yes 90000-98000 33000-53000 180-190 57%
Steel 1215 Yes 78300 N/A 167 136%
Steel 4140 Yes 100000-160000 N/A 200-310 66%
Steel 11L17 Yes 86300 N/A 179 9%
Steel 12L14 Yes 78300 28000-41000 163 198%
Titanium 6AL-4V Yes 131000 74000 334 22%
Titanium 6AL-4V ELI Yes 125000 20300 326 22%
Titanium 3Al 2.5 No 89900 24700 256 N/A

Types of Milling

Vertical Milling: Vertical milling operation involves a drill press and tooling rotation that primarily works vertically. A typical vertical CNC milling machine has three axes where the tooling moves vertically.

Horizontal Milling: Horizontal milling machines and vertical milling machines have a similar principal function. However, horizontal milling involves tooling that spins horizontally. These two different milling machines use a similar type of tooling.

3-Axis CNC Milling: In 3-axis milling, the part remains motionless while the cutting tool mills along three different axes. 3-Axis milling machine applications include contoured shapes, hole features and sharp edges.

4-Axis CNC Milling: With 4-axis milling, the machine operates on multiple axes, with an additional rotation around one of the axes. This additional rotation is called the A-axis. It is used to create cut-outs on the side of a workpiece.

5-Axis CNC Milling: 5-axis milling machines utilize all 4-axes of 4-axis machining plus an additional rotational axis (B-axis). 5-axis milling machines can produce complex parts for various industries.

9-Axis Milling: A 9-axis milling machine is similar in basic capabilities of the 5-axis machine but also includes angle milling, balance turning and more. 9-axis machines use both the B-axis and additional tools to create complex parts.

High-Speed Milling and Its Advantages

High-speed machining involves milling at a high metal-removal rate in order to reduce cycle time and increase productivity. At higher speeds, the cutting forces decrease, and less heat is generated. This creates less risk of tool deflection or workpiece distortion. This is an essential factor in precision engineering but is particularly important whenever someone is working on components with thin walls or harder metals. Metal chips are also smaller and are removed more efficiently at higher speeds, even when the machine is dry or not well lubricated. With high-speed machining, you can get surface finishes with low friction.

Milled Parts Machines, Part Sizes and Precision Tolerances

Here are the machines we use to mill parts:

Machine TypeMachining MethodXYZ Machining LimitsPrecision / Repeatability (in.)AxisBrand / Description
Machine TypeMachining MethodXYZ Machining LimitsPrecision / Repeatability (in.)AxisBrand / Description
Milling CNC Horizontal Mill 20" X 20" X 20" ±0.0002 B-Axis Daewooo
Milling CNC Horizontal Mill 20" X 20" X 20" ±0.0002 B-Axis Doosan
Milling CNC Vertical Mill 24.4" X 19.7" X 11.8" ±0.00004 3-axis Sodick (1/2)
Milling CNC Vertical Mill 24.4" X 19.7" X 11.8" ±0.00004 3-axis Sodick (2/2)
Milling CNC Vertical Mill 64" X 29" X 24" ±0.00012 4-axis Doosan
Milling CNC Vertical Mill 27.6" X 15.7" X 11.8" ±0.00012 3-axis Brother (1/4)
Milling CNC Vertical Mill 27.6" X 15.7" X 11.8" ±0.00012 3-axis Brother (2/4)
Milling CNC Vertical Mill 27.6" X 15.7" X 11.8" ±0.00012 3-axis Brother (3/4)
Milling CNC Vertical Mill 27.6" X 15.7" X 11.8" ±0.00012 3-axis Brother (4/4)
Milling CNC Vertical Mill 51.5" X 22.5" X 24" ±0.0002 4-axis Akira Seiki
Milling CNC Vertical Mill 32" X 20" X 20" ±0.0002 3-axis Akira Seiki
Milling CNC Vertical Mill 32" X 19" X 20" ±0.0002 3-axis Akira Seiki
Milling CNC Vertical Mill 24" X 18" X 20" ±0.0002 3-axis Akira Seiki
Mill-Turn CNC Multi-Axis Bar capacity: 2.6" - Main Spindle Std Chuck: 6"Main Spindle Max Chuck: 8″ - Max turning diameter: 21.25"Max turning length: 40.15" ±0.00008 9-axis Doosan
Mill-Turn CNC Multi-Axis Bar capacity: 2.6" - Chuck capacity: 8" - Swing: 9.1"Max turning diameter 9" - Max turning length: 27.4" X & Z-axis: ±0.00008Y-axis: ±0.00012C-axis: ±0.006° 8-axis Doosan
Mill-Turn CNC Multi-Axis Bar Capacity: 2.6" - Chuck capacity: 8" - Swing: 21.6"Max turning diameter: 13" - Max turning length: 20.1" X & Z-axis: ±0.00008Y-axis: ±0.00012C-axis: ±0.006° Y-Axis Daewooo
Milling Manual Vertical 36" X 12" X 21" ±0.0005 3-axis Bridgeport
Milling Manual Vertical 36.5" X 15.75" X 16" ±0.0005 3-axis Atrump
Milling Manual Vertical 30.25" X 12.75" X 21" ±0.0005 3-axis Atrump
Milling Manual Vertical Z-axis (Drill Press style) operations only 3-axis Kent USA
Milling CNC Vertical Mill 26" X 15" X 4" ±0.005 3-axis Sharp
Milling CNC Vertical Mill 26" X 15" X 4" ±0.005 3-axis Sharp
Milling CNC Horizontal Mill 22.06" X 26.2" X 26.2" ±0.0002 3-axis Mazak
Milling CNC Vertical Mill 13.78" X 21.66" X 20.08" ±0.0002 5-axis Mazak
Milling CNC Vertical Mill 13.78" X 21.66" X 20.08" ±0.0002 5-axis Mazak
Milling CNC Vertical Mill 41.3" X 20" X 20" ±0.0002 4-axis Mazak
Milling CNC Vertical Mill 17.72" X 8.27" X 36.69"
 Capacity - Max Swing: 20.87" - Max Machining Dia: 19.69" Max Bar Work Capacity: 4.0" - Max Machining Length: 33.62" ±0.0002 5-axis Mazak
Milling CNC Vertical Mill 20.08" X 36.83" X 20.08" ±0.0002 5-axis Mazak
Milling CNC Vertical Mill 26" X 16" X 20" ±0.0002 3-axis Hurco
Milling CNC Vertical Mill 40" X 20" X 20" ±0.0002 3-axis Hurco
Milling CNC Vertical Mill 50" X 20" X 20" ±0.0002 3-axis Hurco
Milling CNC Vertical Mill 42" X 24" X 24" ±0.0002 3-axis Hurco
Milling CNC Vertical Mill 24" X 20" X 24" ±0.0002 3-axis Hurco (1/3)
Milling CNC Vertical Mill 24" X 20" X 24" ±0.0002 3-axis Hurco (2/3)
Milling CNC Vertical Mill 24" X 20" X 24" ±0.0002 3-axis Hurco (3/3)
Milling CNC Vertical Mill 60" X 25.98" X 24.01" ±0.0002 5-axis Hurco
Milling CNC Vertical Mill 26" X 14" X 18" ±0.0002 3-axis Hurco (1/2)
Milling CNC Vertical Mill 26" X 14" X 18" ±0.0002 3-axis Hurco (2/2)
Milling CNC Vertical Mill 40" X 18" X 18" ±0.0002 3-axis Hurco
Milling Manual Vertical 26" X 15" X 4"; Knee: 12.5" Right Angle Head ±0.005 3-axis Kent USA
Milling CNC Vertical Mill 42" X 24" X 20" ±.0002 3-axis OKK
Milling CNC Vertical Mill 26" X 14" X 18" ±.002 3-axis Hurco
Milling CNC Vertical Mill 26" X 16" X 20" ±.0008 3-axis Hurco
Milling CNC Vertical Mill 40" X 20" X 20" ±.002 (Temporary) 3-axis Hurco
Milling CNC Vertical Mill 30" X 20" X 24" ±.00019 3-axis Hurco
Milling CNC Vertical Mill 30" X 20" X 24" ±.00019 3-axis Hurco
Milling CNC Vertical Mill 30" X 20" X 24" ±.00019 3-axis Hurco
Milling CNC Vertical Mill 30" X 20" X 24" ±.00019 3-axis Hurco
Milling CNC Vertical Mill 42" X 24" X 24" ±.0003 3-axis Hurco
Milling CNC Vertical Mill 84" X 34" X 30" ±.00019 3-axis Hurco
Milling Manual Vertical N/A ±.0005 3-axis Lagun

Advantages of Milling

  • It can be used to create any desired shape
  • It makes prototyping and short runs affordable
  • It is used to create high dimensional tolerances
  • It can be used to create smooth finishes

Design Considerations of Milling

  • It can be used to create shapes like straight edges during machining
  • It creates a visible cut pattern on the material surface
  • Best to avoid flimsy shapes and deep pockets and ensure every corner is rounded

We ship parts ANYWHERE in the US
in as little as 1-3 days!

We ship parts ANYWHERE in the US in as little as 1-3 days!

We have 4 locations that cover the US

West Coast / Silicon Valley Location
215 Devcon Dr.,
San Jose, CA 95112

Mid West Location
900 Cheyenne Ave.,
Grafton, WI 53024

East Coast Location
244 Burnham Intervale Rd.,
Contoocook, NH 03229

East Coast Location
205 Pine St.,
Hopkinton, NH 03229

Frequently Asked Questions

Are you a broker or a manufacturer?

We are a full service sheet metal and machining manufacturer with four U.S. production facilities across the nation allowing us to deliver your high-quality parts FAST.

Does PROTOTEK manufacture in higher-volume quantities?

We focus on prototypes to low-volume production and can do larger runs. All our parts, from one – to 100 – to 1,000+ are always delivered with production-quality finish.

What are your payment terms?

PROTOTEK offers Net 30 payment terms for established customers with good credit.

What file formats are required or suggested for requesting a quote?

We accept .STP, .DWG, .IGS, .PDF, Parasolid files, and more.

What if I need help with my part design?

Our estimators are on hand to discuss your specific job needs. Our expert team can help you move your project smoothly through the design process and on to delivery.

If I do not have a CAD model, can you quote/fabricate my parts?

Yes, we can work directly from your drawings. Additional engineering charge (NRC) may apply depending on complexity.

How do I submit my NDA and other document requests?

Submit your NDA, Approved Vendor and other document requests to your sales rep or estimator.

How long is a quote valid?

Our quotes stand firm for 7 days from the date of issue.

How fast can I get my order?

Lead time for standard orders is 10 business days. Expediting options are available, including emergency service – down to as fast as 1-2 business days, depending on complexity of work and materials.