Your Surface Finishing Service

Unlocking Precision and Aesthetics: Surface Finishing Services by TIRAPID.

Surface finishing is more than just a final step—it’s a crucial process that elevates the performance, durability, and visual appeal of your CNC machined parts. At TIRAPID, our comprehensive surface finishing services help overcome the limitations of raw machining by delivering consistently superior finishes tailored to your specifications.
From micro-deburring and electropolishing to anodizing, powder coating, and chemical passivation, we offer a broad range of finishing options for metals and plastics alike. Whether your project calls for enhanced corrosion resistance, tighter dimensional control, or a mirror-like cosmetic finish, our expert team ensures every detail is optimized.
Supported by trusted partner facilities and strict quality control protocols, TIRAPID is equipped to manage both prototype and large-volume production runs. We serve a wide range of industries including aerospace, medical, electronics, and automotive—helping global manufacturers achieve high-quality standards, visual consistency, and enhanced part functionality.

What Is Surface Finishing?

Surface finishing is a critical post-machining process designed to enhance the appearance, durability, and functional performance of machined parts. From improving corrosion resistance to achieving a mirror-like aesthetic, surface finishing techniques play a vital role in ensuring that parts meet both engineering and visual standards. Common methods include anodizing, electropolishing, powder coating, electroplating, bead blasting, and passivation—each chosen based on the specific material, environment, and application requirements.

TIRAPID’s approach to surface finishing integrates seamlessly into the manufacturing workflow, reducing lead times and rework. We apply intelligent process planning, strict quality inspections, and advanced finishing tools to ensure each surface is not only consistent but tailored to your exact needs. From functional coatings to decorative treatments, our finishing solutions add value beyond machining—turning technical parts into production-ready components.

Why Surface Finishing Matters in CNC Machining

Exceptional surface finishing is crucial for CNC machined parts, impacting long – term performance, corrosion resistance, and functionality. It’s vital for components like aerospace brackets and medical implants, influencing performance, safety, and compliance.

As an ISO 9001 – certified manufacturer, TIRAPID integrates professional surface finishing in manufacturing. We adhere to strict quality protocols, closely monitoring processes like anodizing and electropolishing with surface roughness testing and material checks.

In complex geometries, tight tolerances, or with high – performance materials, surface finishing is even more critical. With nearly a decade of experience in medical, aerospace, and industrial sectors, TIRAPID ensures parts are dimensionally accurate, functionally complete, and meet high – quality and durability standards.

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Comprehensive dimensional reporting

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Strict EN3.1 material certification

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Average delivery time of 1 - 2.5 weeks

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First Article Inspection Report (FAIR)

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Tolerance within ±0.05 mm or better

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Usually delivered 2 days earlier than planned

TIRAPID’s Various Surface Finishing Materials

We support a broad range of materials for advanced surface finishing, including aluminum, stainless steel, titanium, PEEK, and PPSU. Each material responds differently to finishing processes, so we fine-tune our methods to achieve the best performance and appearance.

Our skilled finishing team works closely with trusted partners, using industry-standard equipment and techniques to ensure consistent, high-quality results. Whether your focus is durability, biocompatibility, conductivity, or aesthetics, we’ll help match the right finish to your material.

Browse our full material list below. If your material isn’t listed, we’re happy to assist with your specific needs.

If the material you need is not included in this list, please contact us and we will provide it for you.

If you require material not listed here, please contact us and we will provide it to you.

If the material you need is not on this list, please contact us and we will provide it for you.

If you require a material that is not on this list, please contact us and we can provide it for you.

If you require a material that is not on this list, please contact us and we will provide it for you.

Surface Finishes

aluminum 6061 black painted

Machining surface

Surface roughness can be precisely specified using an Ra value. Our standard Ra range is 3.2 - 1.6um, ensuring a consistent and high quality surface finish.

aluminum 6061 creamy surfaced

Sand blasting

Sandblasting size: Our standard sandblasting size is 80um, and we can flexibly provide sizes in the range of 50 - 120um to meet your specific requirements.

aluminum 6061 white sprayed

Anodizing type 2 surface treatment

Our standard colors: clear/natural, black, red, green, blue, yellow/gold. This finish perfectly matches the specified RAL number, ensuring color consistency and aesthetic appeal.

aluminum 6061 yellow coated

Anodized Type 3 surface treatment

Standard colors: black or gray. This surface treatment provides a softer appearance but significantly enhances surface protection, making it ideal for applications where durability and resistance to wear and corrosion are critical.

Our operating mechanism

Experience the precision and reliability of our surface finishing workflow, designed to deliver consistent results through a clear, three-stage process. Whether it’s anodizing, electropolishing, or coating, our system ensures that each step—from surface preparation to final inspection—is optimized for your material and application.

Start your surface finishing journey with TIRAPID today. Simply share your part specifications, and our expert team will provide a personalized assessment of finishing methods, performance expectations, and visual requirements—ensuring every detail is handled with care and confidence.

Common Problems of Surface Finishes

Want a quote?

The fastest way to get started is through our online quote form. But if you’d like to chat first, our engineers are just an email away at project@tirapid.com.

How do I choose the right surface finish for my part?

Choosing the right finish depends on the material, function, and environmental exposure. Our engineers will assess your needs and recommend the most suitable option.

Do we have ISO 9001 certification ?

Yes, TIRAPID is ISO 9001 certified. It demonstrates our strong commitment to quality management systems and the benefits this brings to our customers.

Can I apply surface finishing to internal features or threads?

Some processes can reach internal areas, but limitations apply. We’ll review your drawings to determine the feasibility.

Will anodizing affect the thickness of the product ?

In the world of anodizing, Type II is the standard variation. Clear coatings under Type II are typically 5 – 15 µm thick, while colored or tinted coatings are 10 – 25 µm thick. Type III anodizing, often referred to as “hard anodizing,” can be 20 – 80 µm thick. A useful design principle to remember is that 50% of the anodic coating is below the original surface and 50% is above it. For example, a 12 µm coating will add 6 µm to the part thickness, which is critical for precise design and assembly considerations.

Do you offer custom color or texture options?

Absolutely. We support custom colors (RAL, Pantone) and textures for branding or functional purposes.

In-depth understanding of related resources

CNC Machining Services

Discover the transformative potential of CNC machining services in modern manufacturing. This versatile solution offers precision, efficiency, and scalability, enabling the creation of intricate components and high-volume production with unparalleled accuracy.

CNC Milling Services

CNC milling services deliver exceptional precision and adaptability for producing complex parts. Advanced milling techniques ensure sharp details, customized geometries, and accurate components for diverse industrial applications.

CNC Turning Services

CNC turning services specialize in creating high-precision cylindrical parts. With capabilities to handle various materials, this process ensures tight tolerances, smooth finishes, and efficiency in manufacturing.

Precision Machining Services

Precision machining services offer unmatched accuracy and quality, catering to industries with stringent requirements. From aerospace to medical devices, this process guarantees intricate detailing and consistent results for critical applications.

Prototype Machining

Prototype machining bridges the gap between concept and production by enabling rapid development of functional prototypes. This process saves time, reduces costs, and allows for design validation before full-scale manufacturing.

Manufacturing Partner Facilities

Global Surface Finishing Capabilities

TIRAPID collaborates with a network of certified surface finishing partners across China and globally, each equipped with specialized facilities for treatments such as anodizing, electropolishing, powder coating, and chemical conversion. Our manufacturing ecosystem enables us to handle complex finishing requirements for diverse industries, from aerospace to medical.

Industrial Precision Meets Scalability

Our facilities are equipped to scale—from prototype finishing for a single part to batch production of hundreds. Automated lines, clean rooms, and strict environmental controls ensure every finish meets technical and visual specifications. Each part is tracked through digital workflows for consistent results.

Tested, Certified, and Trusted

All surface finishing facilities follow ISO 9001 quality systems and undergo routine audits. Whether your project calls for ROHS-compliant coatings, aerospace-grade corrosion resistance, or medical-grade cleanliness, our partners have the documentation and experience to deliver.

Case studies: showcasing our success stories

Passivation of Stainless Parts for a Swiss Precision Valve Maker

A Swiss valve manufacturer required ASTM A967-compliant passivation for precision-machined 316L stainless steel parts used in pharmaceutical valves. TIRAPID carried out nitric acid passivation with bath monitoring and titration-based chemistry control. Each batch included FPI testing and surface iron detection below 0.05%. Certificates of compliance and dimensional reports were delivered with every lot. Orders were fulfilled in 5–7 working days, supporting the client’s GMP-compliant production line.

Powder Coating Enclosures for a UK Industrial Sensor Brand

An industrial electronics company in the UK required matte black powder coating for steel enclosures, prioritizing outdoor durability and visual consistency. TIRAPID performed multi-layer coating with film thickness between 65–85 μm, tested to withstand 500+ hours of salt spray exposure (ASTM B117). Consistency was ensured with batch pull tests and gloss meter verification. Orders were fulfilled in batches of 200–500 pcs within 8–10 working days, maintaining on-time delivery for their OEM clients.

Anodizing Aerospace Components for a French Satellite Project

For a high-altitude satellite platform, a French aerospace integrator needed uniform, durable anodizing on aluminum housings for embedded avionics. TIRAPID applied Type II sulfuric acid anodizing with tight color tolerance and surface insulation requirements. Surface roughness was controlled below Ra 0.6 μm, and MIL-A-8625F certification was achieved through our in-house salt spray and cross-section testing. Parts were batch serialized and shipped within 14 days, ensuring reliable assembly under ESA protocols.

Trust the professionalism of TIRAPID engineers

We faced tight deadlines and strict budgets, but the TIRAPID team exceeded our expectations. Their 5-axis machining technology helped us create accurate parts that fully met our high standards. TIRAPID is professional and efficient, and it is reassuring to work with them. I highly recommend them!

man backpack journey

Allen

a customer from the aviation parts industry

Whether it is a simple part or a complex project, TIRAPID always provides us with high-quality 5-axis machining services. They not only provide professional advice, but also ensure the balance between delivery time and price. We have been working with TIRAPID for many years and they have never let us down once!

man dog bonding

Kevin

a customer from the industrial equipment manufacturing industry

TIRAPID is our most trusted partner for high-precision manufacturing. Their 5-axis machining services are delivered on time and within tight tolerances, fully meeting our technical needs. The team communicates efficiently and the service process is transparent. I am impressed by TIRAPID's professionalism.

man forest hike

David

a customer from the medical device industry

I am very satisfied with TIRAPID's responsiveness and expertise. Their 5-axis machining solution saves us production time while ensuring high-quality manufacturing results. From quotation to delivery, everything is efficient and smooth.

man street walk

Jack

a customer from the precision machinery manufacturing industry

It is a very pleasant experience to cooperate with TIRAPID. Their 5-axis machining service is not only accurate and reliable, but also delivered ahead of schedule every time. Their attention to detail and reasonable prices make us very satisfied. They are undoubtedly our long-term partners.

woman laptop use

Annie

a customer from the automotive parts industry

TIRAPID tailored a high-precision 5-axis machining prototype solution for us that met our budget and time requirements. The parts they delivered were excellent and reliable. I highly recommend them.

woman office work

Amy

a customer from the robotics R&D industry

Our customers always trust TIRAPID's high-quality delivery capabilities. In a time-sensitive medical device project, we not only completed the delivery ahead of schedule, but also helped the customer save 15% of costs by optimizing the design. TIRAPID is not only a manufacturer, but also a true technical partner.
TIRAPID's technical capabilities make me feel at ease, and their professional advice is crucial to the success of the project.

woman wall pose

Mia

a customer from the medical device manufacturing industry

Dedicated project management and support

We are a knowledgeable, lean and experienced team of engineers. To contact us, please see the contact details below and one of our team members will be happy to assist you.

tirapid bella purchaser and order follower

Bella Liang

Purchaser Manager

tirapid galen chairman and founder

Galen Cui

Founder

tirapid maggie du salesperson

Maggie Du

Project Manager

project -manager-tirapid

Nick Zhai

Project Manager

tirapid rea chairman and founder

Rea Tang

Founder

tirapid zoey operator

Zoey Yong

Project Manager

Kaya

Kaya Chen

Project Manager

Lin Fu Prodction Director

Lin Fu

Prodction Director

Candy Liu

Project Manager

Chloe Xu

Project Manager

Explore our range of manufacturing processes

CNC Machining Services

5 axis CNC milling process
Tolerances down to±.01mm(±.0004in)
Lead times from 3 working days

5 Axis CNC Machining

Easily machinecomplex parts
Speeds up production for faster delivery
Easily handles parts up to 600mm(24in)in length.

CNC Milling Services

Length capacity of up to 3000mm(118in)
Over 50 material options(metals and plastics)
Expertise in ultra-thin wall part production

CNC Turning Services

Minimum Part Size as Small as 2mm
Achieves Surface Finish up to Ra0.6
Tailored for Small-Batch Manufacturing

Surface Finishing

Passes 72-Hour Salt Spray Test
Over 21 Surface Finishing Options

Screw Machining Services

Excels in small, precise, complex parts
Automation ensures quality and efficiency
Perfect for aerospace, medical, and electronics

Wire EDM Services

Delivers burr-free results for clean finishes
Easily produces intricate and detailed shapes
Keeps costs low for manufacturing complex components