Custom Titanium Alloy EDC Coins: The Engineering, Haptic Mechanics & Sourcing Playbook

Grade 5 titanium alloy (Ti-6Al-4V / TC4) is an alpha-beta alloy containing 6% aluminum and 4% vanadium. It offers a minimum tensile yield strength exceeding 830 MPa and an annealed surface hardness around 32–38 HRC. This hardness is crucial for everyday carry coins because it resists denting from keys, scratches from coins in the same pocket, and severe deformation in internal magnet detents. In contrast, Grade 2 is commercially pure titanium; while highly corrosion resistant, it has a yield strength of only ~275 MPa and is prone to galling and adhesive wear when rubbing under pressure. For tactile clickers, Grade 5 also produces a much crisper acoustic snap.

At Velnora Titanium Industry Co., Ltd., we utilize 4-axis and 5-axis high-speed CNC milling centers equipped with high-precision optical toolsetters. For critical features—such as magnet pocket diameter, magnet depth, and center pivot locator pins—we hold tolerances within ±0.01 mm (±0.0004 inches). This micro-precision ensures press-fit or adhesive retention of rare-earth magnets without loose play, eliminates rotational wobble, and maintains a consistent tactile air-gap between mating discs.

Titanium anodization does not apply paints or pigments; instead, it uses controlled electrical voltage in an electrolytic bath to grow an optically transparent titanium dioxide (TiO2) layer. Color is perceived through light interference reflection. While this oxide layer is chemically bonded and will never peel, flake, or chip, the microscopic film (tens to hundreds of nanometers thick) can slowly wear down on proud exterior edges when subjected to friction against steel car keys or coins. To maximize anodized durability, we recommend: 1) applying deep CNC relief so the color sits protected in recessed grooves, 2) pre-texturing with ceramic bead blasting, or 3) selecting high-voltage green/gold colors which feature a thicker physical oxide barrier.

Yes. Our in-house CAM engineering department accepts native STEP, IGES, STL, and vector DXF files. For sculptural coin reliefs (mythological motifs, topographic elevation maps, commemorative emblems), we utilize high-precision 3D surfacing toolpaths with ball-nose micro endmills down to 0.2 mm diameter. We also combine multi-pass fiber laser engraving (for high-resolution micro-text, serial numbers, and 2D logos) with slow-wire EDM to produce flawless edge contours and intricate skeletonized cutouts.

For custom OEM/ODM production runs, our standard MOQ is 100 pieces per design. For exotic material specifications such as multi-layer Timascus (Mokuti) or complex multi-piece mechanical assemblies, we support boutique brands and Kickstarter creators with pilot production runs starting at 50 pieces, and we offer prototype sampling from 1 to 5 pieces. Typical rapid prototyping turnaround is 7 to 12 working days. Full batch production orders generally ship within 20 to 30 calendar days.

Protecting our clients' original artistic designs and mechanical inventions is paramount. We routinely sign comprehensive bilateral Non-Disclosure Agreements (NDAs) prior to receiving CAD files. All tooling programs, fixtures, and production runs are managed under strict confidentiality. Velnora never sells, licenses, or displays client-branded designs on public commercial platforms without prior written authorization.

Unlike conventional trading brokers who keep buyers in the dark, Velnora believes in absolute shop-floor transparency. As a direct manufacturer in Baoji, we provide our international buyers with routine photographic and high-definition video updates documenting the CNC machining process, toolpath cutting, laser serialization, and anodizing stages. You can review your parts in real time before they are packed and shipped.