Quality Control

Laser Engraving Specifications for Custom Metal Giveaways

Why Engraving Fails After the Metalwork Passes

Laser engraving is often the last visible operation on a custom metal giveaway, so it can become the weak point in an otherwise acceptable order. The casting, stamping, plating and enamel may pass inspection, but the back logo, serial number, QR code or staff name can still be too shallow, too small, off-center, duplicated or hidden by a pin post or split ring. Because engraving is usually done after plating, the defect appears late, when rework means unpacking finished goods or remaking plated parts.

For B2B orders, engraving is rarely just decoration. It may identify 5,000 sequential challenge coins, mark warranty codes on keychains, personalize employee badges, or add sponsor text to the reverse side of a pin. Those details need production specifications: location, size, content rules, plating finish, contrast standard, inspection method and tolerance. A note such as “laser logo on back” is not enough for repeatable manufacturing.

Most metal promotional items can be laser engraved after plating, including iron, brass, zinc alloy and stainless steel. The best results come when the engraving is designed before tooling starts: reserve a flat zone, confirm hardware clearance, choose a finish with readable contrast, and approve a real engraved sample on the final plating stack.

Select the Right Marking Process

Fiber laser engraving is the standard option for plated metal giveaways. It removes or modifies the top surface and creates contrast against the plating or base layer. On nickel, chrome, matte nickel and stainless steel, the mark is usually grey to dark grey with clean edges. On polished gold, rose gold and some black finishes, contrast can be lower and must be confirmed by sample, not by screen proof.

Mechanical engraving cuts deeper into thick coins, plaques and nameplates, but it is slower and less suitable for tiny serials or high-volume variable data. Chemical etching can create a permanent recessed logo before plating, but it requires tooling or masking and is poor for changing numbers. UV printing can show color logos and gradients, but it sits on the surface and has different abrasion resistance from laser marks.

For most custom orders below 20,000 pieces with serials, names or QR codes, fiber laser is the practical choice. Typical setup is USD 25 to USD 80 per artwork or data file. Unit engraving cost is commonly USD 0.03 to USD 0.18 per side, depending on mark size, quantity, handling method and whether each piece carries unique data.

Method	Best use	Key limit	Typical extra cost
Fiber laser engraving	Serial numbers, names, simple logos, QR codes on plated metal	Low contrast on mirror gold or curved surfaces	USD 0.03 to USD 0.18 per piece
Mechanical engraving	Deep marks on thick challenge coins, plaques and nameplates	Slow for tiny text below 1.5 mm or variable data	USD 0.12 to USD 0.45 per piece
Pre-plating chemical etching	Permanent recessed logos on repeat programs	Not suitable for sequential numbering or late changes	USD 60 to USD 180 setup plus unit cost
UV printing	Color sponsor logos, gradients and event graphics	Surface wear on high-abrasion keychain backs	USD 0.05 to USD 0.25 per piece

Reserve a Flat, Measurable Engraving Zone

Laser marks need a stable focal distance. If the engraving crosses a raised rim, curved coin edge, domed epoxy border, recessed texture or uneven cast surface, line width and color can vary. For coins and keychains, reserve a flat area that is clear of raised artwork and at least 0.3 mm lower than surrounding borders where possible. Do not assume the whole back face is usable.

The engraving zone should be shown as a dimension in the technical drawing. A 25 mm lapel pin may have only 14 to 18 mm of usable flat width after allowing for a butterfly clutch post, anti-rotation spur and 1.0 mm edge clearance. A 45 mm challenge coin can usually hold a 22 to 30 mm diameter engraving area if the center is flat. A 60 mm bottle opener keychain may lose 15 to 25 mm of back-side layout space to the opener cutout and split-ring hole.

For stamped or die-cast metal giveaways, use ±0.3 mm as a practical engraving position tolerance on regular shapes and ±0.5 mm on irregular outlines or hand-polished edges. If the mark must align with a retail card window or numbered certificate, define a datum point, such as “centered 12.0 mm below top loop centerline,” instead of “centered on back.”

• Provide the engraving field as width by height in millimeters, such as 18 mm × 8 mm.
• Keep at least 1.0 mm clearance from cut edges, loops, holes and raised rims.
• Keep at least 1.5 mm clearance from pin posts, magnets, bottle opener openings and moving hardware.
• Avoid engraving across enamel, epoxy domes, rhinestones, glitter, deep sandblast texture or antique cavities.
• For double-sided products, confirm which side faces outward in packaging and photography.

Set Minimum Sizes for Text, Logos and Codes

Engraving can reproduce fine lines, but readability depends on viewing distance, plating contrast and handling conditions. For routine warehouse or event use, specify engraved text at 1.2 mm minimum height for simple sans-serif fonts. Use 1.5 to 2.0 mm when the user must read the mark quickly without magnification. Decorative slogans can be smaller only if legibility is not a functional requirement.

Fine strokes below 0.12 mm often break or disappear after polishing, plating variation or antique finishing. For logos, remove hairlines, shadows, tiny registered marks and thin script strokes before production. Vector artwork in AI, EPS, PDF or SVG is preferred. If bitmap art is unavoidable, use at least 600 dpi at final engraving size, but expect less predictable edges.

QR codes need more space than many buyers expect. An 8 mm × 8 mm QR code may scan on a clean matte surface with short data, but reliability drops on curved, reflective or brushed metal. For event check-in, warranty registration or authentication, use 10 mm × 10 mm minimum and 12 to 14 mm when the code contains a URL with tracking parameters. Keep a clear quiet zone equal to at least four modules around the code.

Element	Absolute minimum	Production target	Practical note
Simple serial number	1.0 mm text height	1.2 to 1.5 mm	Use Arial, Helvetica or similar sans-serif fonts
Small logo text	1.2 mm text height	1.5 to 2.0 mm	Avoid thin scripts, condensed fonts and tiny trademarks
Single-line logo stroke	0.12 mm line width	0.18 to 0.25 mm	Thicker strokes tolerate plating and polishing variation
QR code	8 mm × 8 mm	10 to 14 mm × 10 to 14 mm	Use short URLs and test on physical samples
Data matrix code	5 mm × 5 mm	7 to 10 mm × 7 to 10 mm	Better for short IDs than marketing URLs

Match Plating Finish to Contrast Requirements

The same laser file can look different on each finish. Shiny nickel, matte nickel, chrome and brushed stainless steel normally give the most readable grey-to-dark marks. Black nickel can look premium, but the engraving may be subtle or uneven if the laser exposes a lighter underlayer inconsistently. Antique finishes can hide small marks inside dark recesses, which is useful for tone-on-tone branding but poor for scannable codes.

Gold and rose gold are the most common contrast risks. A light laser mark on polished gold may be visible only at certain angles. If the engraving is functional, such as inventory serials or authentication codes, consider nickel, matte nickel, brushed stainless steel, or a recessed panel with black infill instead of mirror gold. If the buyer insists on gold, approve the final sample under normal office lighting, not just under a factory inspection lamp.

Plating thickness affects both appearance and consistency. Decorative gold-color finishes on promotional goods are commonly about 0.05 to 0.15 microns of gold flash over nickel or copper layers. Nickel layers are often 3 to 8 microns depending on the process and price level. If the engraving must expose a specific layer or avoid exposing the base metal, ask the factory to confirm the plating stack and run a sample on finished plated parts.

• Choose shiny nickel, matte nickel or brushed stainless steel when readability is more important than a luxury look.
• Use antique plating when engraved marks should blend into a vintage design, not when codes must scan quickly.
• Avoid critical serials on mirror gold unless a physical sample proves contrast under normal lighting.
• Specify brushed direction if engraving sits on brushed metal, because cross-grain marks can look patchy.
• For black plating, approve mark color and burn depth; excess power can create rough grey edges.

Control Variable Data Before Production Starts

Variable engraving creates a different risk profile from a fixed logo. The factory cannot guess whether 00437 should follow 00436, whether name order is Western or local, or whether duplicated QR codes are allowed. The buyer should provide one locked spreadsheet with one row per piece, one field per engraving location and no merged cells. Final files should be frozen before the pre-production sample is approved.

For sequential numbering, define the exact format: start number, end number, digit count, prefix, suffix and leading-zero rule. “EVENT-0001 to EVENT-2500” is clear. “1 to 2500” is not clear if four digits, carton grouping or certificate matching are later expected. If cartons must carry number ranges, define carton quantity and label format before packing begins.

For names, confirm case sensitivity, accents, punctuation and font. Do not allow long names to be squeezed below the minimum text height without written approval. A practical planning limit is 18 Latin characters at 1.5 mm height in a 28 mm × 5 mm field, although narrow fonts and shorter names can improve fit. For QR codes, provide either final code artwork or a generator rule, then scan the engraved sample using the same phone distance and lighting expected in use.

Data type	Buyer should provide	Factory should confirm	Main inspection risk
Sequential numbers	Start, end, prefix, suffix, digit count and leading-zero rule	First 5 and last 5 engraved samples	Missing, duplicated or out-of-sequence numbers
Individual names	Locked spreadsheet, approved font and maximum character rule	Longest name layout before mass engraving	Misspellings or unreadable compressed text
QR codes	Final encoded data or generator rule	Physical scan test on plated sample	Code scans in file but fails on product
Carton range labels	Pack quantity and number-range rule	Printed carton label sample	Wrong number range packed in wrong carton

Plan MOQ, FOB Cost and Lead Time Realistically

Laser engraving usually does not change the base product MOQ, but it changes handling cost and schedule. For custom pins, coins and keychains, a practical MOQ is often 100 pieces per design, while better unit pricing usually starts at 300 to 500 pieces. Variable engraving below 100 pieces is possible, but setup and handling can dominate the unit cost.

As a working benchmark, a 40 mm zinc alloy keychain with one-side serial engraving may quote around USD 0.85 to USD 1.80 FOB China at 500 pieces, depending on plating, enamel, attachment and packaging. The engraving portion may add USD 0.05 to USD 0.12 per piece plus a USD 30 to USD 60 data setup fee. A 45 mm challenge coin with one-side sequential numbering may add USD 0.06 to USD 0.15 per piece to a base FOB range of roughly USD 1.60 to USD 3.80 at 300 to 1,000 pieces.

Fixed logo engraving normally adds 1 to 2 production days after plating approval. Sequential numbers under 5,000 pieces usually add 2 to 4 days. Individual names, unique QR codes or split packing by number range commonly add 3 to 5 days because the factory must import data, test samples, control sequence and verify packing. Paid pre-production samples on the actual plated finish typically add 5 to 8 days and USD 50 to USD 150, but they are cheaper than remaking a finished batch.

Order type	Typical MOQ	Engraving add-on	Lead time impact
Fixed back logo on pins	100 pcs; best pricing from 300 pcs	USD 0.03 to USD 0.08 per pc plus setup	Add 1 to 2 days
Sequential coin numbers	100 pcs; best pricing from 300 to 500 pcs	USD 0.06 to USD 0.15 per pc	Add 2 to 4 days under 5,000 pcs
Personalized names	50 to 100 pcs depending on handling	USD 0.08 to USD 0.18 per pc	Add 3 to 5 days
Unique QR codes	100 pcs typical	USD 0.08 to USD 0.20 per pc plus data setup	Add 3 to 5 days plus scan testing

Write Inspection Criteria That Prevent Disputes

Engraving inspection should be measurable. Without agreed criteria, a buyer may reject marks as too light while the factory considers them normal for the finish. For most non-regulated promotional metal goods, use ANSI/ASQ Z1.4 or ISO 2859-1 sampling at General Inspection Level II, with AQL 2.5 for major defects and AQL 4.0 for minor cosmetic defects. Use tighter limits only when the engraving supports authentication, traceability or contractual serialization.

Major engraving defects include wrong content, missing engraving, duplicate serials where uniqueness is required, unreadable QR codes, engraving on the wrong side, or marks outside the agreed position tolerance. Minor defects include slight contrast variation, small laser residue outside the critical area, or position drift still within tolerance. For functional QR codes, scan testing is part of inspection, not an optional photo review.

Approve a golden sample before mass engraving begins. It should show the final plating, laser settings, font, code density, placement and packaging orientation. Keep one approved sample at the factory and one with the buyer or distributor. A raw metal trial or digital mockup cannot predict final contrast on plated, polished and packed goods.

• Set position tolerance: commonly ±0.3 mm for regular shapes and ±0.5 mm for irregular outlines.
• Define acceptable contrast by physical golden sample or signed production photo set under agreed lighting.
• For QR codes, scan at least 32 pieces or the AQL sample size, whichever is higher.
• Check first article, middle production and final batch for long serial-number runs.
• Reject any duplicate or missing serial when unique numbering is specified.
• Confirm carton range labels before packing if numbers must match certificates, cards or retail sets.

RFQ Checklist Before You Release the Order

Before requesting a firm price, decide whether the engraving is decorative, functional or traceability-critical. Decorative engraving can tolerate lower contrast and smaller text. Functional engraving needs readable marks, stable code scanning and stricter inspection. Traceability-critical engraving needs locked data, serialization control, carton range rules and documented rejection criteria.

Send the factory vector artwork, a dimensioned drawing with the engraving zone, final plating finish, hardware layout, data file if variable engraving is required, and the inspection standard. For QR codes, provide real destination data and state whether each item uses the same code or a unique code. If the product includes a pin post, magnet, split ring, bottle opener cutout or lanyard attachment, show the engraving location relative to that hardware.

If the mark is close to the minimum size or the finish is mirror gold, black nickel or antique plating, approve a paid pre-production sample on the actual plated finish before mass production. The extra sample time is usually the lowest-cost way to prevent unreadable logos, failed QR scans, duplicate numbers and late-stage rework.

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