Expert Custom CNC Machining Services for Industrial Parts

Since 1993, Shandong Prime International has supported industrial buyers with custom CNC machined parts—from prototypes to production orders. We operate under an ISO 9001 quality management system and run 10 production lines to keep lead time and quality stable.

For each RFQ, we align the drawing revision, key CTQ features, inspection method, material, and finishing requirements—then confirm the final lead time and inspection scope in the quotation.

Why Choose Prime for Your CNC Parts?

We understand what purchasing managers and engineers need for approval and risk control:

Quality You Can Rely On (ISO 9001 Certified):

We follow ISO 9001 process control, including material verification, in-process inspection, and final checks before shipment. Inspection records/reports can be provided on request.

Over 30 Years of Proven Experience:

Since 1993, we support one-stop manufacturing and post-machining needs, helping buyers control CTQ features, assembly fits, and repeatability.

Rapid Delivery & On-Time Performance:

Lead time depends on part complexity and finishing. We confirm the timeline after drawing/CTQ review and list it in the quote.

Competitive Pricing without Sacrificing Quality:

We quote based on material, machining, finishing, and inspection scope—so cost drivers are clear and comparable.

Flexible Customization & Engineering Support:

Send STEP/IGES/DWG/DXF/SLDPRT/PDF. We help align manufacturability with your functional requirements.

Meticulous Packaging & Stable Logistics:

Packaging is matched to part geometry and surface protection needs to reduce transit risk and keep parts inspection-ready on arrival.

Our CNC Machining Capabilities

Our state-of-the-art facility is equipped to handle a wide range of CNC machining processes, ensuring your parts are manufactured to exact specifications.

Attribute	Specification
Machining Processes	CNC Milling (3, 4, 5-axis), CNC Turning, Drilling, Tapping, Grinding
Materials	Metals: Aluminum (6061, 7075), Stainless Steel (303, 304, 316), Carbon Steel, Brass, Copper, Titanium Plastics: ABS, PC, POM, PEEK, Nylon
Surface Finishes	Anodizing, Plating (Zinc, Nickel, Chrome), Powder Coating, Polishing, Passivation, Heat Treatment
Tolerances	Tolerances: Based on geometry, material, fixturing, and measurement method. We confirm achievable tolerance and inspection plan during RFQ.
Part Size Range	Confirmed by drawing and machining method during RFQ.
Accepted File Formats	STEP, IGES, .x_t, .dwg, .dxf, SLDPRT, PDF

Industries We Serve

We proudly supply custom CNC parts to a diverse range of industries worldwide, including:

•Automotive

Brackets, housings, shafts, and fixtures with tight tolerances and repeatable quality.

Custom CNC-machined gearbox housing with jaw coupling, roller chain drive, and maintenance tools on an industrial conveyor system

•Industrial Machinery

Wear parts, tooling components, couplings, and custom hardware built for uptime.

Custom CNC-machined electronics enclosure with aluminum heat sink, mounting brackets, precision panel, and hardware ready for assembly

•Electronics & Telecommunications

Enclosures, heatsink parts, brackets, and precision panels for assembly-ready fit.

Custom CNC-machined medical device parts in stainless steel and aluminum with smooth finish, consistent dimensions, and clean edges

•Medical Devices

Precision stainless/aluminum parts with controlled burrs, consistent dimensions, and clean finishing.

General Hot Selling Products

Customized CNC parts can be divided into several main types according to different machining processes, and each process has its unique characteristics and application fields. The following are some common CNC part types grouped by process and their characteristics and areas of application:

CNC turning parts

Applications:Engine parts, shafts, gears, etc. in automobile manufacturing. Aircraft engine parts, landing gear parts, etc. . Mechanical equipment bearings, gears and other power transmission parts. Electronic connectors, electronic enclosures, etc. .

Parts for CNC milling

Features：
The use of rotating tools to cut the workpiece, you can machine complex geometric shapes, usually plane, groove, curved surface, etc. .
Suitable for more complex parts, and can process more than one surface at the same time.
High machining accuracy, can reach the micron level.

Applications:Plastic mold, metal mold and so on in the mold manufacture. Complex aerospace components and spacecraft assemblies. Precision instruments such as medical instruments and instrument casings. Automobile industry in the engine parts, transmission parts, etc. .

CNC grinding of parts

Features：
Very high Surface finish and dimensional accuracy can be achieved by grinding the surface of the workpiece with a high-speed rotating abrasive tool.
It is suitable for the parts with high hardness and complex shape.
Mainly used for surface finishing, can effectively improve the surface quality of parts.

Application:High precision tools such as moulds, cutting tools, bearings, etc. . Automotive engine parts, brake system components, etc. in the automotive industry. Precision electronic parts of the surface processing, high-precision aviation parts.

CNC Electrical discharge machining (EDM) parts

Features：
The electrode is used to process materials with high hardness or complex shape by means of EDM.
Able to process traditional machining is difficult to achieve complex holes, small structures or hard materials.
Suitable for precision detail machining, but the production speed is relatively slow.

Application:Complex mold, cooling channel, precision hole processing, aero-engine parts, high precision hole processing, automotive gear, Cam and other complex parts, precision parts and hole processing in the electronics industry.

CNC laser cutting parts

Features：
Laser cutting using high-intensity laser beam to heat the material surface to the molten state, through the airflow will be blown away the molten metal, cutting materials.
Suitable for cutting sheet metal, cutting edge smooth, no need for subsequent processing.
High machining accuracy, suitable for complex shapes and details of the processing.

Applications:Automotive shells, interior parts, steel components, building decorations and other architectural structures, electronic metal shells, electronic components, aerospace light structural parts, cabin components.

CNC laser marking parts

Features：
The surface of the material is marked by a laser beam, which can be words, patterns, two-dimensional codes, etc. .
No need for consumables, marking clear, durable, applicable to metal, plastic, glass and other materials.
High speed, high precision, widely used in product tracking and identification.

Applications:Mobile phones, computers and other products identification and two-dimensional code, medical equipment marking, auto parts number and tracking, consumer goods brand identity, product serial number, etc. .

CNC water jet cutter cutting parts

Features：
Through high-pressure water with or without sand to carry out cutting, can cut a variety of materials, including metal, plastic, stone, glass, etc. .
No heat affected zone, suitable for cutting materials with different thickness.
Suitable for complex shape, fine cutting, smooth edge, reduce thermal deformation.

Applications: Body Cutting, precision parts processing and other automotive manufacturing, Stone, tile cutting and other construction industries, sculpture and decoration of fine cutting, high-precision parts processing, etc. .

In Summary

Ach CNC process has its unique advantages, select the appropriate processing method can help to achieve efficient, accurate part customization. According to the parts of the material, shape, precision requirements and production volume and other factors, you can choose the appropriate process to meet your needs.

Post-Machining Operations After Metal Part Production

After stamping / welding / casting / forging, we apply CNC machining to achieve tight tolerances, functional interfaces,
and clean assembly fits. Use the filter below to view typical post-machining workflows by part type.

Part Type	Typical Machining Operations	Critical Features	Typical Tolerance Targets	QC & Notes
Investment / Sand Casting Post-Machining	CNC milling, drilling & tapping, boring, face-milling, reaming DatumsBore Finish	Sealing faces, valve seats, bearing bores, threaded ports, locating bosses	±0.05–0.10 mm typical; tighter on bores/faces as required	Establish stable datums first; remove casting skin on functional areas. CMM on key bores/true position; leak test for fluid parts when needed.
Forged Components Finish Machining	Turning, milling, drilling, tapping, slotting, chamfering, deburring ThreadsFlatness	Bearing seats, shaft journals, mounting faces, bolt patterns, keyways	±0.02–0.08 mm typical; concentricity/runout per drawing	Control distortion after heat-treat; verify hardness if specified. Use fixture to maintain repeatability; SPC for high-volume features.
Welded Assemblies Machining After Welding	Face milling, hole drilling/reaming, boring, tapping, surface grinding PlanarizingReaming	Mounting planes, precision hole spacing, mating faces, alignment bores	±0.05 mm typical; hole position tighter as required	Weld distortion management is key—machine critical faces after welding. Check flatness & parallelism; jig/fixture recommended for repeatability.
Stamped Parts Secondary Machining	Drilling, tapping, countersinking, chamfering, CNC trimming, reaming CountersinkDeburr	Threaded holes, precision slots, assembly holes, edge conditions	Hole size/position per drawing; burr limits per acceptance criteria	Confirm burr direction & max burr height; use go/no-go gauges for threads. Protect cosmetic surfaces during fixturing and handling.
General (All Types) Finishing Touch	Deburring, edge rounding, surface finishing prep, cleaning, marking	Sharp-edge removal, assembly fit, cosmetic consistency	Per drawing / agreed workmanship standard	Define acceptance criteria early (edge break, Ra, visual class). Final inspection report available (CMM / dimensional sheet).

Best practice: For precision interfaces (bearing bores, sealing faces, alignment holes), we recommend “weld/produce first → stress relief if needed → finish machine” to lock in geometry and repeatability.

Our One-Stop Process

From concept to delivery, our streamlined process makes sourcing custom parts easy.

Step 1: Design Review & Modeling

We review the drawing revision, functional requirements, and CTQ features to confirm manufacturability and inspection approach.

Step 2: Material Selection

We align material grade, environment (corrosion/wear), and required standards based on your application.

Step 3: CNC Programming (CAM) & Simulation

Toolpaths are programmed and simulated to reduce risk on critical features.

Step 4: Setup + Machining

Operators set up fixturing, run machining per program, and perform in-process checks where needed to keep CTQ features under control.

Step 5: Quality Inspection

We verify dimensions, tolerances, and surface requirements using appropriate measuring tools. Inspection records can be provided on request.

Step 6: Post-Processing & Surface Treatment

Deburring, polishing, anodizing, plating, passivation, etc., as required—planned to protect CTQ features.

Step 7: Final Inspection & Packing

Final check plus protective packaging to keep parts safe and inspection-ready during export shipping.

Step 8: Delivery

After inspection and packing, parts are delivered for your assembly or production use.

Want to know how to compress lead times?

In order to shorten the production and delivery cycle, we suggest that you tell us your needs in detail, and we will adjust the strategy flexibly according to your requirements to ensure your production and help you succeed!

Deburred custom CNC machined metal parts on a workshop bench with uniform finish, ready for coating or final inspection

Prime | Custom CNC Parts Surface Finishing

Surface Finishing for Custom CNC Machined Metal Parts

A good finish is not just “looks”—it protects against corrosion, controls friction, improves wear resistance, and makes assemblies fit and perform consistently. Send your drawing + functional targets, and we’ll recommend the finishing route that matches your application, environment, and cost.

Deburring & Edge Break Anodizing Zinc / Nickel Plating Black Oxide Passivation Powder Coating Bead Blasting

Function-Driven Selection

We match finish type to corrosion class, wear, conductivity, appearance, and assembly needs.

Consistent Batch Output

Controlled prep + masking strategy helps keep critical dimensions and mating surfaces stable.

Inspection-Ready Delivery

Clean parts, protected surfaces, and packaging that supports final QC and shipment.

Our Typical Finishing Workflow

Surface Prep
Deburring, edge breaking, media blasting or brushing to remove tool marks & sharp edges.
Cleaning & Degreasing
Remove coolant/oil and residues to ensure coating adhesion and prevent stains.
Masking for CTQ Features
Protect threads, bearing bores, sealing faces, and datums when thickness matters.
Finish Application
Anodize / plating / passivation / black oxide / powder coating, per requirement.
Final Check + Packaging
Visual + thickness/adhesion checks (as required) and protective packing for export.

Finish	Typical Use	Notes
Anodizing (Aluminum)	Corrosion + appearance	Hard anodize available for wear resistance
Zinc / Nickel Plating	General corrosion protection	Thickness can affect threads & fits
Passivation (Stainless)	Restore corrosion resistance	Best after machining & cleaning
Powder Coating	Durable decorative layer	Great for housings / brackets

Tip: If your part has tight tolerances or precision mating surfaces, tell us the CTQ features and allowed buildup. We’ll plan masking and finishing sequence accordingly.

Popular Finishing Options (Details)

Deburring & Edge Finishing

Removes burrs and sharp edges from milling/turning, improves handling safety, and helps coating adhesion. Options include manual deburring, tumbling, brushing, and controlled chamfer/edge break.

Bead Blasting / Brushing

Creates a uniform matte texture, hides minor tool marks, and prepares a stable surface for anodizing or coating. Useful for visible components and housings.

Anodizing (Type II / Hard Anodize)

For aluminum parts: improved corrosion resistance and appearance. Hard anodize supports wear resistance for sliding or contact surfaces (confirm requirements for sealed areas and critical dimensions).

Plating: Zinc / Nickel (and custom options)

A common choice for corrosion protection and consistent appearance. For threaded parts, we manage tolerance stack-up with thickness targets and masking when needed.

Black Oxide / Phosphate

Thin conversion coatings that reduce glare and provide mild corrosion protection (often used with oil). Good for fasteners, tooling components, and assemblies requiring minimal dimensional change.

Passivation (Stainless Steel)

Removes free iron and helps restore the stainless surface layer after machining. Common for medical, food-related, and corrosion-sensitive environments (process standard can be specified in your RFQ).

Powder Coating / Paint

Durable exterior layer with broad color options. Ideal for brackets, covers, and enclosures. We can support masking for grounding points, threads, and sealing faces.

Want a finishing recommendation fast? Send the drawing (PDF/DWG/STEP), base material, application environment (indoor/outdoor/chemical/salt), and any spec/standard you must follow.

Request Quote + Finish Advice

The Common Pitfalls When Purchasing

Purchasing process, a little careless may fall into the temptation of low prices, quality risks or hidden terms and other common traps.

• Improper material selection: Confirm grade + environment + required standards early. For corrosion-sensitive parts, define the corrosion class and finishing requirement in RFQ.
• Poor design for manufacturing: Unclear datums, unrealistic tolerances, or missing CTQ definitions increase cost and delay. Align CTQ features and inspection method before production.
• Unreliable supplier control: Ask what inspection happens in-process and before shipment, and what records can be provided for approval and traceability.

FAQS

Frequently Asked Questions
What is your Minimum Order Quantity (MOQ)?
As a B2B wholesale supplier, our MOQ depends on the part’s complexity and material. Please contact us with your project details for a specific answer. We are flexible for long-term partners.
What are your typical lead times?
Prototypes are typically delivered in 7–10 days after drawing confirmation, while mass production ranges from 3–5 weeks depending on complexity and finishing.
How do you ensure quality?
We are ISO 9001:2015 certified. We perform material verification, in-process inspection, and final quality checks before shipment. Inspection reports are available on request.
Can you handle complex parts?
Absolutely. With our 5-axis CNC machines and experienced engineering team, we manufacture parts with complex geometries and tight tolerances.

Our Certificate

Third-party verification supports supplier approval. Below are our ISO 9001 certificate, SGS test report, and CNIPA utility model patents. If you need a PDF copy for internal review, tell us which document you require.

A Brief Self-Nomination, Why Choose Prime?

Choose Us, you will get reasonable prices, high quality, on-time delivery of metal CNC parts solutions.

Experience: We have more than 30 years of metal CNC parts production experience, can provide the industry with high-quality customized metal CNC parts.

Professional team: Our Engineering team is familiar with metal CNC parts production technology, can provide accurate design and production services.

Quality assurance: We are ISO 9001 certified to ensure that each metal CNC part meets the highest quality standards.

Rapid Response: We are committed to providing fast sample production and production cycle, to ensure that your needs can be met in a timely manner.

Global Services: No matter where you are, we can provide you with quality services to ensure the smooth progress of your business.

Get in touch

Ready to Start Your Next Project?

At Prime, we simplify the process of sourcing high-quality, customized hardware parts for your business. Follow these three simple steps to get started:

Tell Us Your Requirements

Share detailed information about your needs, including drawings, reference images, and any specific ideas or specifications you have in mind.

Receive Tailored Solutions & Quote

Based on your requirements and design, we’ll provide a custom solution and send you a detailed quote within 24 hours.

Approve for Production

Once you approve the design and quote, we’ll begin mass production and take care of the shipping, ensuring timely delivery.

Partner with a Leader in Industrial Parts Manufacturing

Reach out to us for a free quote Discuss your requirements with our engineering team today and discover the Prime difference.