Surface Finished

Surface Treatment

Surface Treatment has been part of our core machining capabilities for over 10 years, providing ultra-fine OD surface finishes and ultra-tight OD tolerances for our customers. We provide production lead times as short as 24 hours for outside diameter centerless grinding, and can supply small volume runs and high volume requirements.

We offer Thru Feed centerless grinding for machined metal parts that require grinding of the major outside diameter. When there are no “centers” on the component, and only the outermost diameter needs to be ground, the parts can be fed down a chute and between two grinding wheels that spin the part to remove material the surface.

Workpiece Size And Tolerances

Our Thru Feed centerless grinding services handle part diameters from .065″ (1.65 mm) to 1.5″ (38.1 mm) for a vast range of part lengths and offer maximum efficiency at minimal cost.

  • Maximum efficiency grinding
  • Minimum cost grinding
  • Grinding after heat treating eliminates distortion


Providing exceptional finishes and tight OD tolerances often requires centerless grinding after CNC Swiss Turning of precision machined components. We continually invest in our equipment and capabilities to uphold this standard and adapt to meet our customers’ evolving needs.

T/T, L/C, Escrow, Moneygram, etc. Which payment method can choose, you can communicate with our commercial manager.

We will have different payment methods according to different products

We have a series of cooperation processes to make sourcing easier for you at Eathu Metals.   

1. In-depth understanding of your requirement. 

2. Custom production solutions. 

3. Schedule the production schedule. 

4.Start producing you order. 

5. Monitor the production process. 

6. Inspect the product quality irregularly. 

7. Customized packaging solutions. 

8. Pre-shipment inspection and arrangement of shipment. 

9.After Service. 

Yes, of course. But because TDB provides OEM service. Different products will have different weights. As for whether it is free, you need to communicate with our business manager to confirm.

Yes. Of course. TDB will customize comprehensive service content for each old customer including free mold opening service. If you are a new customer, we can offer two preferential policies: First, you can pay the mold fee in advance. We will return the cost to you in the form of payment in your future cooperation; secondly, you can place large quantities of orders at one time, and we will provide free mold opening services.

There is no minimum order quantity requirements at TDB Vietnam.Our services can support you scale from one-off prototypes all the way to mid- and high-volume production.

Surface Finish Options for Turnet Part

AS9100D and ISO9001:2015 certification (see our certification here) means we maintain quality standards worthy of the medical and aerospace industry requirements. Our modern non-contact inspection systems and software record detailed inspection results and provides Statistical Process Control (SPC) data for our customers. We use automated inspection equipment to measure both internal and external features, but no part leaves without a visual inspection.

Application & Industries

To modify the outside diameter (OD) of a precision machined component, there are two types of cylindrical surface grinding operations that can be used: centerless and centered. Grinding the OD of a CNC Swiss turned component offers several benefits: a smoother surface finish (Ra), a tighter OD tolerance (up to +/.0001”) and elimination of the distortion that can happen during heat treatment. In Centered grinding, the part is held stationary and the grinding wheel moves up and down the part to remove material. To do this, there are using small indentations on the ends of the part (called centers) to aid the grinding machine in holding the part stationary In Centerless grinding, the grinding wheel is stationary. The part moves through the machine and past the grinding wheel, which removes the material from the part. This process is used when the part can not have centers added to the ends of the component.