Metal Letters & Signs
— 304 Stainless Steel
Mirror, brushed & halo backlit metal letters, fabricated to order from 304 stainless steel for architectural and commercial signage. A factory-level engineering reference for sign resellers, architects, procurement teams, distributors and project contractors — with material, finish, backlighting, MOQ and QC specifications you can place an order against.
Metal letters are three-dimensional, solid-metal letterforms cut or fabricated from 304 stainless steel. They are the premium, longest-life option in architectural signage — outlasting acrylic letters and painted channel letters by a wide margin, and holding a mirror-polished or brushed surface for decades with almost no maintenance.
What you can expect from our factory
- 304 / 316 stainless steel, mirror (No.8), brushed (No.4) and hairline finishes
- Backlit (halo) construction — 304 face + acrylic back panel + LED strip
- UL 48 / CE / RoHS compliant components and power supplies (Mean Well)
- MOQ from 1 piece (samples) to 10+ (bulk); 3–7 working-day production
- Free engineering drawing + written quote within 24 hours
Material Engineering: 304, 316 & 201 Stainless Steel
Stainless steel resists corrosion through a self-healing chromium-oxide passivation layer — when the surface is scratched, chromium reacts with oxygen to re-form a protective film. That is why a 304 letter keeps its finish outdoors for decades while a plated or painted mild-steel letter rusts through in a few seasons. Choosing the right alloy is the single most important durability decision on a metal-letter order.
| Alloy | Common name | Cr / Ni content | Corrosion resistance | Outdoor / coastal | Best use |
|---|---|---|---|---|---|
| 304 | V2A (A2) | 18–20% Cr / 8–10.5% Ni | Excellent, general | Indoor + outdoor (standard) | Default for most architectural lettering |
| 316 | V4A (A4) | 16–18% Cr / 10–14% Ni + 2–3% Mo | Superior (molybdenum vs. chloride) | Coastal / marine (within ~50 mi of salt water) | Seafront hotels, marinas, offshore signage |
| 201 | — | 16–18% Cr / 3.5–5.5% Ni (high Mn) | Moderate | Indoor only (budget) | Low-cost interior lettering where corrosion is not a risk |
We default to 304 (AISI 304 / EN 1.4301) for metal letters. We recommend 316 (EN 1.4401) whenever the sign sits within roughly 50 miles of salt water, is exposed to de-icing salts, or faces industrial chlorides. For budget indoor projects we can quote 201, but we flag its lower nickel content and reduced corrosion resistance up front so there are no surprises in service.
Surface Finishes: Mirror (No.8), Brushed (No.4) & Hairline
The finish — not the metal — is what the eye reads first. Stainless steel finishes are defined by grit and measured by surface roughness (Ra). Lower Ra = smoother and more reflective. We control finish with a defined grit sequence and inspect every letter for grain direction and reflectivity before packing.
| Finish | Grit / process | Roughness (Ra) | Look | Fingerprint / scratch | Typical use |
|---|---|---|---|---|---|
| No.8 Mirror | Successive mechanical polish | ≤ 0.05 µm | Distortion-free, chrome-like reflectivity | Shows fingerprints & micro-scratches readily | Premium lobbies, flagship façades, landmark branding |
| No.4 Brushed / Satin | 150–180 grit abrasive | 0.2–1.5 µm | Directional satin grain, low glare | Hides fingerprints well; wipe with the grain | Offices, modern retail, corporate signage |
| HL Hairline | Continuous fine-grit polish | 0.3–2.0 µm | Long continuous hairline streaks | Very fingerprint-resistant | Architectural façades, elevators, door frames |
Finish data per the 304 stainless surface-finish reference from Huaxiao Metal; No.8 mirror achieves the lowest roughness (≤ 0.05 µm Ra) and is the most corrosion-resistant because polishing removes the crevices where contaminants lodge. Brushed grain can be oriented horizontally or vertically — tell us which, and we align it across every letter in a set.
Three Metal-Letter Constructions
| Construction | How it is built | Depth / thickness | Illumination | Best for |
|---|---|---|---|---|
| Flat-cut (solid) letters | Laser-cut from solid 304 sheet | 1–10 mm thick | Non-illuminated (or face-mounted LED) | Interior wall lettering, logos, dimensional branding |
| Fabricated (built-up) letters | Face + welded returns form a hollow 3D body | Return depth 10–60 mm | Non-lit or front/halo-lit | Façade letters, deep 3D dimensional signs |
| Backlit (halo) letters | 304 face + acrylic back panel + internal LED strip | Return depth 20–80 mm | Halo-lit (reverse-lit) | Premium storefronts, hotel/restaurant branding, night visibility |
Backlit (Halo) Metal Letters — Construction Engineering
A backlit metal letter is a hollow 304 stainless shell whose face stays solid and whose light is aimed backward, onto the wall. Inside the shell, an LED strip is mounted against a laser-cut acrylic back panel; light passes through the acrylic and reflects off the wall, drawing a soft halo around each letterform. By day the letters read as solid architectural metal; after dark the wall glows and the lettering stays legible from across a street — without the glare of an exposed-bulb sign.
- Face: 304 stainless, mirror (No.8), brushed (No.4) or powder-coated finish
- Back panel: laser-cut opal acrylic diffuser (translucent), sealed inside the shell
- Light source: 12V DC LED strip, 5000–7000K white (warm white / RGB on request), 50,000-hour rating
- Power: UL-listed Mean Well Class-2 supply, sized per letter run
- Mounting: stud-mounted 10–20 mm off the wall so the reflected halo forms cleanly
- Weathering: IP65 sealing, drainage weep holes, waterproof LED modules for outdoor installs
Technical Specifications & Product Parameters
| Parameter | Specification | Notes |
|---|---|---|
| Material | 304 / 316 stainless steel (201 optional) | AISI 304 = EN 1.4301; 316 = EN 1.4401 |
| Letter height | 50 mm – 2000 mm (2″ – 78″) | Custom sizes outside this range on request |
| Thickness (flat-cut) | 1 – 10 mm | Solid-sheet letters |
| Return depth (fabricated / backlit) | 10 – 80 mm | Hollow 3D body, welded returns |
| Surface finish | No.8 mirror / No.4 brushed / HL hairline / powder coat | Custom colour match available |
| Illumination | Non-lit / front-lit / backlit (halo) | Halo = reverse-lit; front-lit = face-lit |
| LED | 12V DC, 5000–7000K white / warm white / RGB | 50,000-hour rated modules |
| Power supply | Mean Well, UL-listed Class-2 | Sized per letter run; wiring diagram supplied |
| IP rating (outdoor backlit) | IP65 | Waterproof modules + weep holes |
| Mounting | Stud / spacer / rail / adhesive / threaded rod | 1:1 drilling template included |
| Certification | UL 48, CE, RoHS, ISO 9001 | SGS reports on request |
Applications by Industry
- Corporate & offices — lobby logo walls, reception lettering, boardroom branding (brushed No.4 or mirror No.8)
- Hospitality — hotel façade and entrance letters, restaurant signage, backlit halo letters for night curb appeal
- Retail & flagships — storefront dimensional letters, PVD-gold and powder-coated brand colours
- Institutional — university, healthcare and government building identification
- Architectural & wayfinding — façade logos, entrance monoliths, donor and dedication walls
Customization Options
- Fonts & logos — send your vector file (AI / EPS / PDF / DXF) or choose from our font library; we laser-cut to exact shape, spacing and kerning
- Finishes — mirror, brushed, hairline, powder-coated (any RAL/Pantone colour), PVD gold / rose-gold / titanium
- Sizes & thickness — any letter height from 50 mm to 2000 mm; flat-cut, fabricated or backlit
- Illumination — non-lit, front-lit, or halo backlit with white / warm-white / RGB LED
- Mounting — stud, spacer (floating effect), rail, adhesive, threaded rod; 1:1 template supplied
- Backing panels — clear, frosted or coloured acrylic; metal or wood backers
Total Cost of Ownership: Metal Letters vs. Alternatives
Metal letters cost more up front than acrylic or painted channel letters, but on a 10-year horizon they are usually the cheapest option — they never yellow, crack or fade, and they need almost no maintenance. The comparison below assumes a comparable storefront lettering set.
| Option | Up-front cost | 10-yr lifespan | Maintenance | 10-yr TCO verdict |
|---|---|---|---|---|
| 304 metal letters (this product) | Higher | 20+ years outdoors | Minimal (wipe with grain) | Lowest over time — no replacement |
| Acrylic letters | Low | 3–7 years (yellows/crazes) | Replacement + re-gluing | Higher — replaced 2–3× in 10 yrs |
| Aluminum letters (painted) | Medium | 5–10 years (paint fades) | Repaint | Medium — repaint cycle |
| Front-lit channel letters | Medium-high | 8–15 years (LED + acrylic face) | Face/LED replacement | Medium — component wear |
Quality Control & Test Methodology
Every batch passes a documented QC gate before packing. For corrosion-critical orders we run salt-spray and passivation verification; for illuminated letters we run a 24-hour burn-in and brightness-uniformity check.
| Test | Standard / method | What it verifies |
|---|---|---|
| Salt-spray (corrosion) | ASTM B117 (as required) | Pitting / rust resistance of 304 vs. 316 in chloride exposure |
| Surface finish / Ra | Profilometer (Ra, µm) | No.4 / No.8 / HL finish consistency to spec |
| Grain direction & reflectivity | Visual + reflectometer | Uniform grain across a letter set; mirror clarity |
| Dimensional accuracy | CMM / vernier vs. drawing | Letter height, stroke width, spacing ± tolerance |
| LED burn-in | 24-hour continuous run | Early-failure screening, colour temperature stability |
| Brightness uniformity | Luminance meter across face | Even glow, no hot spots on halo letters |
| Waterproof / seal | IP65 pressure + spray test | Outdoor backlit letter sealing |
| Passivation | ASTM A967 / nitric or citric | Chromium-oxide layer present after fabrication |
Failure Modes & Prevention (What to Watch For)
The field failures below are the ones engineers and procurement teams should design against up front. Most are prevented at specification time, not in service.
| Failure mode | Root cause | Detection | Prevention (specify at order) |
|---|---|---|---|
| Pitting / tea-staining | 316 not used near salt; surface contamination | Brown specks on face | Specify 316 + passivation for coastal sites |
| Fingerprint / micro-scratch clouding | No.8 mirror handled without film | Hazy reflectivity | Keep protective film; specify No.4 or HL in high-touch areas |
| Halo uneven / hot spots | LED spacing or diffuser gap | Uneven wall glow | Specify diffused acrylic + correct LED pitch |
| LED premature failure | Non-branded modules / poor heat | Dead sections | Specify 50,000-hr modules + branded Mean Well supply |
| Letter detachment | Wrong mount for substrate / weight | Loose or fallen letter | Specify stud/spacer mount + template; review substrate |
| Water ingress (outdoor) | Seal not IP65 / missing weep holes | Internal condensation | Specify IP65 + bottom weep holes |
MOQ, Pricing Factors & Lead Time
| Item | Detail |
|---|---|
| MOQ | 1 piece (samples) · 10+ pieces (bulk, tiered pricing) |
| Production | 3–7 working days after design approval (fabricated/backlit 7–10 days) |
| Free proof | Engineering drawing + quote within 24 hours |
| Shipping | Express 5–7 days · air ~10 days · sea 40–65 days · DDP available |
| Payment | T/T, L/C, PayPal — 50% deposit / 50% before shipment |
| Incoterms | FOB / CIF / DDP with protective packaging + insurance |
Pricing is per letter and scales with height, material (304 vs. 316), finish (mirror vs. brushed vs. powder coat), construction (flat-cut vs. fabricated vs. backlit) and quantity. Mirror polish and backlit builds carry a premium; volume orders of 50+ and 100+ units unlock 15–25% tiered pricing. Send your artwork for an exact quote.
Production Process
- Artwork intake — vector file (AI/EPS/PDF/DXF) or font + text; we normalise and set spacing/kerning.
- Engineering proof — dimensioned shop drawing with letter heights, stroke widths and mounting layout for your approval.
- Laser cutting — 304 sheet cut to exact letterform; crisp, burr-free edges.
- Forming & welding — returns bent and welded (fabricated/backlit builds); seams dressed clean.
- Surface finishing — No.8 mirror polish, No.4 brush (grain set) or powder coat.
- LED & wiring — LED strip mounted, acrylic back panel sealed, power supply sized (backlit builds).
- QC gate — dimensional, finish, burn-in and waterproof checks (see QC table).
- Packing & ship — protective film + foam/wood-crate packing, FOB/CIF/DDP.
Supplier Evaluation Checklist (Procurement)
Use this 16-point checklist when vetting any metal-letter manufacturer — including us — to de-risk a signage procurement.
- Is the factory direct (no trading company), and can they show the production line?
- Do they certify the alloy (mill certs for 304/316) — not just claim “stainless”?
- Can they specify finish grade (No.8 / No.4 / HL) and Ra tolerance, not just “polished”?
- Do they passivate exterior letters (ASTM A967) and offer salt-spray data?
- Are LED modules branded (50,000-hr) and power supplies UL-listed (Mean Well or equivalent)?
- Is the backlit build IP65 with weep holes, or a dry-indoor-only design?
- Do they provide a 1:1 mounting template and wiring diagram with every order?
- Is MOQ and tiered pricing transparent, with no hidden tooling fees?
- What is the real lead time — including proof approval — for fabricated/backlit orders?
- Do they offer FOB/CIF/DDP and handle export packaging + insurance?
- Can they match brand colours (powder coat / PVD) with a Pantone/RAL reference?
- Do they show a documented QC gate (dimensional, finish, burn-in) or is it verbal?
- Is there a warranty, and what does it actually cover (LED, finish, structure)?
- Can they provide recent project references with photos for your vertical?
- How do they handle rework/returns on a defect, and who pays freight?
- Are they responsive (24-hr quote) and fluent in the required language?
Market Intelligence: Metal Letters in Architectural Signage
Dimensional metal lettering sits inside the architectural signage segment of a larger global signage market that was valued at USD 39.43 billion in 2026 and is projected to reach USD 60.06 billion by 2036 (4.3% CAGR), per Future Market Insights. Within the architectural-signage subsegment specifically, Market Reports World projects growth from USD 1,242.5 million in 2026 to USD 1,907.8 million by 2035 (4.41% CAGR).
Demand drivers: urbanisation and the premium retail / hospitality build-out cycle; brand owners upgrading from painted channel letters to longer-life metal lettering; and coastal and high-humidity markets shifting from aluminum and acrylic toward corrosion-resistant stainless steel. For B2B suppliers, the durable margin is in engineering-led customisation — documented finishes, backlighting and QC — not commodity pricing.
Frequently Asked Questions
What metal are your letters made from, and why 304 stainless steel?
Our standard is AISI 304 (EN 1.4301) stainless steel — 18–20% chromium and 8–10.5% nickel — which resists corrosion through a self-healing chromium-oxide passivation layer and keeps its finish outdoors for decades. For coastal or de-icing-salt exposure within roughly 50 miles of salt water we recommend 316 (EN 1.4401), which adds 2–3% molybdenum for superior chloride resistance.
What is the difference between mirror, brushed and hairline finish?
Mirror (No.8) is polished to a distortion-free reflective surface (≤ 0.05 µm Ra) — the premium lobby and façade look, but it shows fingerprints. Brushed (No.4) has a directional 150–180-grit satin grain that hides fingerprints and reads clean and modern. Hairline (HL) is a long continuous line finish that is the most fingerprint-resistant and is common on architectural façades.
What is a backlit (halo) metal letter and how is it built?
A backlit letter is a hollow 304 stainless shell with a solid face and an internal LED strip mounted against a laser-cut acrylic back panel. Light passes through the acrylic and reflects off the wall, drawing a soft halo around each letterform. It reads as solid metal by day and glows legibly at night, and is stud-mounted 10–20 mm off the wall.
Are your metal letters suitable for outdoor and coastal use?
Yes. 304 letters are rated for standard outdoor use, and we passivate exterior letters to ASTM A967 to restore the chromium-oxide layer after fabrication. For salt-water or high-chloride environments we specify 316, and for illuminated outdoor letters we build to IP65 with waterproof LED modules and drainage weep holes.
What is the minimum order quantity and lead time?
MOQ is 1 piece for samples and 10+ pieces for bulk with tiered pricing. Flat-cut letters ship in 3–7 working days after design approval; fabricated and backlit builds take 7–10 working days. Express shipping reaches most countries in 5–7 days, with air (~10 days) and sea (40–65 days) options and DDP available.
Can you match my brand font, logo and exact brand colours?
Yes. Send a vector file (AI / EPS / PDF / DXF) or choose a font and text, and we laser-cut to the exact letterform, spacing and kerning. For colour we offer powder coating to any RAL or Pantone reference and PVD finishes (gold, rose-gold, titanium) for a premium metallic brand look.
What certifications and QC do your metal letters carry?
Components and power supplies are UL 48 / CE / RoHS compliant, with ISO 9001 factory quality management and SGS reports on request. Every batch passes a documented QC gate — dimensional, finish/Ra, 24-hour LED burn-in, brightness uniformity and (for outdoor) IP65 waterproof checks.
Key Takeaways
- 304 / 316 stainless steel, mirror (No.8), brushed (No.4) and hairline finishes — no paint to fade
- Backlit (halo) construction: 304 face + acrylic back + LED strip, IP65 for outdoor
- UL 48 / CE / RoHS compliant, Mean Well power supplies, ISO 9001 factory
- MOQ 1 piece (samples) to 10+ (bulk); 3–7 working-day production
- Free engineering drawing + written quote within 24 hours
Get a Free Engineering Drawing & Quote
Send your logo, text and size requirement — we return a dimensioned shop drawing, a finish and material recommendation, and a written quote with MOQ and lead time within 24 hours. Whether you are a sign reseller, an architect, or a procurement manager building a private-label line, tell us your project and we will spec it precisely.
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