PARTS IN 1-3 DAYS
Quick-Turn Milled Parts
We don’t have minimums, we deliver the best parts for your money, and meet your deadlines!
Every job is unique, and many require special considerations for materials, finishing, custom work, or urgent delivery – your commercial quote will be turned around by seasoned estimators who confirm all aspects of your job.
“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
and real milled parts service
Expertise and quality are paramount. With more than three decades of experience in commercially milled parts, we’ve achieved a rich set of certifications and provide high-touch attention and service to every quote – and every job.
We engage with our customers to help them design better and more cost-effective parts before we start manufacturing. We want to be your one-stop shop for parts. Most of our business is from returning customers, and to achieve that, we strive to hit our customer’s deadlines across all project types.
Milled Parts – Working with PROTOTEK
Deep capabilities in commercial sheet metal and machining – design, parts milling, manufacturing, finishing, and even complex assemblies.
What do we do?
- Sheet Metal Parts & Assemblies in 1-3 Days
- CNC Milled and Turned Parts in 1-3 Days
- Additive Manufactured Parts in 1 – 3 Days
- Expedited Jobs
About our fast, flexible, personalized service:
- ISO-9001:2015 Certified, ITAR Registered
- Quotes within 24 Hours
- Contact us about our expedited services
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.
QUOTES WITHIN 24HRS
We accept these file types STP, PRT, IGS, DXF, STL, and more!
PARTS & ASSEMBLIES – ONE STOP SHOP
NO ORDER TOO SMALL
EXPEDITED PARTS IN 1-3 DAYS
Prototek's In-house 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 & Sinker 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
Additive Manufacturing
- Laser Sintering
- Multi Jet Fusion
- Stereolithography
- Digital Light Processing
- Fused Filament Fabrication
- Material Jetting
- Cast Urethane
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 Materials | Grade / Alloy | Heat Treatable | Tensile Strength (Ultimate, PSI) | Fatigue Strength (PSI) | Hardness (Brinell) | Milled Parts Machinability (AISI Rating) | Milled Parts Materials | Grade / Alloy | Heat Treatable | Tensile 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 Type | Machining Method | XYZ Machining Limits | Precision / Repeatability (in.) | Axis | Brand / Description | Machine Type | Machining Method | XYZ Machining Limits | Precision / Repeatability (in.) | Axis | Brand / 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
Prototek
215 Devcon Dr.
San Jose, CA 95112
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Sac EDM a Prototek Company
11341 Sunrise Park Dr.
Rancho Cordova, CA 95742
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Midwest Prototyping a Prototek Company
1100 W 120th Ave #100
Westminster, CO 80234
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Prototek
900 Cheyenne Ave.
Grafton, WI 53024
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Midwest Prototyping a Prototek Company
10949 Blackhawk Dr
Blue Mounds, WI 53517
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Prototype Solutions Group a Prototek Company
1621 Indianhead Drive
Menomonie, WI 54751
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Prototek
205 Pine St.
Contoocook, NH 03229
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Prototek
244 Burnham Intervale Rd.
Contoocook, NH 03229
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6620 Grant Way
Allentown, PA 18106
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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.
