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-Custom parts from your drawings, no MOQ.

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Custom Stainless Steel Sprocket with Black PVD Finish

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Custom CNC machined stainless steel sprocket with chain teeth, keyed bore and a black PVD finish

A customer needed a custom sprocket machined in stainless steel with a black PVD finish. A sprocket is the toothed wheel that meshes with a chain to transmit power in a chain drive. We machined it from solid stainless steel, with the chain teeth on the outer edge, a bored center hole, and a keyway, then applied a black PVD coating. We machine sprockets in other materials too, including carbon steel and plastics, but stainless was the specified choice here for its durability in a corrosive setting.

Project Details

Part type: Custom Stainless Steel Sprocket

Material: Stainless Steel 304

Machining Process: CNC Turning + CNC Milling

Surface Finish: Black PVD Coating, Deburred

After machining and deburring, the sprocket was given a black PVD coating. PVD (physical vapor deposition) applies a thin, hard, evenly colored layer by depositing the coating material onto the surface in a vacuum. On stainless steel it produces a deep, uniform black that ordinary black oxide can’t achieve reliably on stainless, and unlike a paint or a conversion coating it is hard and wear-resistant, so it holds up on a part that sees chain contact and handling. The coating is thin enough that it doesn’t change the tooth or bore sizes. It gives the clean black look the customer wanted along with real wear and corrosion protection on top of an already corrosion-resistant stainless part.

Free Quote & Design Review

We provide custom CNC machining services for low-volume production and rapid prototyping for design verification.  Click Here to Upload Your CAD Files

Our Manufacturing Capabilities

5-axis CNC milling machine cutting an aluminum block during the manufacturing process.

Capabilities include 3-axis and 5-axis CNC milling, as well as CNC turning. Materials include aluminum alloys, stainless steel, titanium, and engineering plastics, among others.

Available secondary operations include anodizing, powder coating, bead blasting, and laser engraving.

Capacity supports everything from single-unit rapid prototyping to low-volume production runs of 1 to 1,000+ units.

Factory Quality Assurance

A highly accurate ZEISS Coordinate Measuring Machine (CMM) inspecting the internal dimensions and tight tolerances of a custom CNC machined component.

A standardized Quality Management System (QMS) is applied to all manufacturing orders, regardless of part complexity or production volume. The following inspection stages are mandatory for every CNC machining project:

  • Material Verification: Raw material certification (chemical composition and mechanical properties) is verified upon receipt to ensure compliance with material specifications.

  • First Article Inspection (FAI): The first unit from any production run undergoes a full dimensional report to validate the machining setup and programming before volume processing begins.

  • In-Process Monitoring: Periodic checks are conducted during the machining cycle to monitor tool wear and ensure dimensional consistency is maintained throughout the batch.

  • Final Inspection: Completed components undergo a final dimensional and cosmetic verification using CMM (Coordinate Measuring Machine) and calibrated manual instruments prior to packaging.

Order Fulfillment Process

Finished CNC machined components securely packaged in custom foam inserts for global shipping.

From CAD to part.

Step 1: Upload & Quote

Upload your CAD files (.step) to our secure platform. Receive a detailed CNC quote and lead time estimate within 24 hours.

Step 2: Free DFM Review

Our engineers conduct a Design for Manufacturability (DFM) analysis to optimize your design for rapid machining and reduce costs.

Step 3: Precision Machining

We ensure your custom CNC parts meet strict tolerance requirements.

Step 4: Quality Control

Every part undergoes rigorous inspection before leaving our factory to ensure it matches your specifications perfectly.

Step 5: Fast Delivery

We ship globally using major carriers (DHL, FedEx, UPS). Get your CNC prototypes delivered to your door in as little as 7 days.

FAQs About CNC Machining Services

No. We support projects of all sizes, from a single prototype unit to low-volume production runs.

Standard lead times are typically 10–15 business days. Expedited services (Rapid Prototyping) can be completed in as little as 3–5 business days, depending on part complexity and material availability.

In most cases, we source materials from our approved suppliers to ensure quality control. However, we can machine customer-supplied materials for specialized alloys or specific requirements upon engineering review.

Unless otherwise specified, our general tolerance standard is ISO 2768-m (±0.125 mm) for metals and ±0.25 mm for plastics. Precision tolerances ±0.005 mm are achievable but must be explicitly stated in 2D technical drawings.

Our facility can accommodate parts up to 4000 x 1500 x 600 mm for milling and Ø200 mm x 500 mm for turning.

Yes. We can install inserts (e.g., Helicoils, PEM fasteners) and perform basic mechanical assembly of machined components prior to shipment.

To provide an accurate quote, we require a 3D CAD file (.step). If the part has threaded holes, tight tolerances, or specific surface finish requirements, a 2D PDF drawing must also be provided.

Not a problem at all. If you don’t have a 3D design, simply share your concept or requirements with us. We work with experienced partnered product designers who can help convert your ideas, hand-drawn sketches, or reference images into professional, manufacturing-ready 3D models.

Please note that 3D modeling services are subject to an additional design fee based on part complexity.

Absolutely. We offer full reverse engineering services for existing parts. Simply mail us your sample, and our engineering team will take care of the rest — from precise measurement and 3D modeling to final CNC production.

We take IP protection seriously. All files are stored securely, and we are willing to sign a Non-Disclosure Agreement (NDA) prior to receiving your data.

Yes. We can provide material certificates (COA) and dimensional inspection reports upon request. Please specify this requirement when placing your order.

We ship globally using major carriers (DHL, FedEx, UPS).

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