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2026-09
Metal Seed Phrase Backup: Designing Chemically Etched Letter Tiles
In a metal seed phrase backup, the lettering deserves as much engineering attention as the enclosure. Buyers need to evaluate character geometry, marking depth, and readability—not simply whether the component is described as stainless steel.
The product specification for this hinged wallet identifies 304 stainless steel letter tiles, with chemically etched lettering on one side and a blank reverse.
Separate Character Etching from Tile Profiling
Chemical etching uses a patterned protective resist and an etchant to remove exposed metal. A partial-depth etch can produce recessed characters, while through-etching can define openings or component outlines. These are distinct features and should be specified separately on the drawing.(fotofab.com)
The supplied product information confirms chemically etched characters. It does not establish how the tile outlines are manufactured. Procurement documents should avoid assuming that the lettering and perimeter use the same process.
For custom stainless steel letter tiles, request definitions for:
- Sheet thickness and thickness tolerance.
- Character height and minimum stroke width.
- Target marking depth and its acceptance range.
- Letter position relative to the finished tile edges.
- Front-side orientation and reverse-side requirements.
Account for Lateral Etching
Chemical etching removes material laterally as well as through its depth. This undercut affects small features and edge profiles. Precision Micro’s published guidelines describe an etched edge cusp typically representing 10–20% of material thickness; this is a supplier-specific design reference, not a measured value for this wallet.(precisionmicro.com)
For character artwork, ask the manufacturer to define how etch factor is measured and how lateral undercut is compensated. A nominal font outline alone is not a complete manufacturing specification.
Specify Readability as an Acceptance Test
For this application, a useful inspection plan should evaluate characters:
- After tile separation.
- After any finishing operations.
- When installed in the actual frame.
- Under agreed lighting and viewing conditions.
Include potentially confusing characters in the approved sample set, such as I/L, C/G, and O/Q. Agree on minimum readable detail rather than relying solely on an attractive enlarged photograph.
Chemical etching avoids the mechanical cutting action and localized laser-cutting heat input associated with alternative profiling processes. That process advantage does not, by itself, certify the finished tile’s flatness, readability, or service life.(fotofab.com)
Developing an etched-letter crypto wallet backup? Send NKEYTO the character artwork, material requirements, and proposed inspection criteria for a manufacturability review.
About NKEYTO
NKEYTO is the international brand of Shenzhen Xintu Precision Hardware Co., Ltd., a precision metal manufacturing supplier based in Shenzhen, China.
We provide one-stop precision metal manufacturing services, including chemical etching, precision laser cutting, stamping, CNC machining, electroplating, and other customized surface treatments. Our capabilities support the development and production of precision metal components for industries such as semiconductors, electronics, optics, medical devices, and industrial applications.
With engineering support and flexible manufacturing capabilities, we help customers develop customized metal parts from prototypes to small and medium-volume production.
For technical evaluation or quotation, please feel free to contact:
Luna
Head of International Trade & Pre-Sales Technical Consultant
Email: luna@nkeyto.com
WhatsApp: +1 213 221 9094
Phone / WeChat: +86 135 5470 8126
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Shenzhen Nkeyto Precision Hardware Co., Ltd. is a factory specializing in precision hardware processing, committed to providing customers with high-quality products and services.We look forward to working with you.
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E-mail: luna@nkeyto.com
Tel: +1 213-221-9094
Add: 13th Building, 202, Dawangshan Second Industrial Zone, Dawangshan Community, Shajing Street, Bao'an District, Shenzhen, Guangdong Province
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