Technical Specifications
- Standard
- Amazon Seller Central FNSKU / Code 128 Subset A/B
- Payload Format
- X00-prefix alphanumeric identifier (typically 10 characters)
- Label Dimensions
- 1.0" × 2.625" (Avery 5160 / 30-up) or 2.25" × 1.25" Direct Thermal Roll
- Mandatory Elements
- Scannable Barcode, FNSKU Code Text, Product Title (max 2 lines), Condition Note (e.g. "New")
- Quiet Zones
- Minimum 0.25" (6.35mm) side margins and 0.125" top/bottom margin
Standard Industry Use Cases
- Amazon FBA private label product prep and fulfillment compliance
- Avery 5160 / 30-up laser and inkjet label sheets for bulk batch preparation
- Direct thermal roll printing (MUNBYN, Rollo, Zebra) for fast on-demand tagging
- Covering existing manufacturer UPC/EAN barcodes to prevent co-mingled inventory errors
Key Benefits of Amazon FBA / FNSKU
Zero Warehouse Rejection Risk
Calibrated Code 128 bar ratios and quiet zones comply strictly with Amazon Seller Central fulfillment guidelines.
Avery 5160 & Thermal Roll Ready
Print 30-up letter sheets on standard office printers or stream continuous labels to MUNBYN, Rollo, and Zebra thermal printers.
Automatic FNSKU Layout Composition
Instantly composes scannable barcode, human-readable code text, product title, and condition indicator into standard 1.0" × 2.625" dimensions.
What Code Do I Need for My Product? (Customer Decision Guide)
Choosing the right barcode format depends on where your product is sold, the packaging substrate, and scanner infrastructure:
Should I use manufacturer UPC or Amazon FNSKU barcode?
Amazon requires FNSKUs (starting with X00) for products that are private-label or not eligible for commingling. Using FNSKUs ensures your inventory is tracked exclusively to your seller account and never mixed with competing sellers.
Which label printer type is best for FBA shipments?
Direct thermal roll printers (e.g. Rollo, Zebra, MUNBYN) are fastest for on-demand tagging because they require no ink or toner. Standard laser printers using Avery 5160 30-up sheets are ideal for high-volume batch prep.
Amazon FBA Shipment Compliance & Policy Guidelines
- Each unit must have a single scannable barcode. Any existing manufacturer UPC, EAN, or ISBN barcodes must be fully covered by the FNSKU label.
- Labels must measure between 1.0" × 2.0" and 2.0" × 3.0". UniversalCodeMaker uses the standard 1.0" × 2.625" template (Avery 5160 / 30-up).
- Do not place transparent tape, shrink-wrap seams, or shipping labels over the FNSKU barcode, as reflective glare causes scanner misreads.
- FNSKU barcodes must strictly use Code 128 symbology with pure black print on white non-reflective label paper.
Frequently Asked Questions
What barcode symbology does Amazon require for FNSKU labels?
Amazon Seller Central mandates Code 128 barcodes for all FNSKU item labels. UniversalCodeMaker automatically generates calibrated Code 128 barcodes with crisp bar-width ratios that guarantee 100% first-pass read rates in Amazon fulfillment centers.
What information must appear on an Amazon FBA item label?
Amazon packaging guidelines require four mandatory elements on every unit label: 1) The scannable Code 128 barcode, 2) The human-readable FNSKU alphanumeric string (e.g., X003B7TEST), 3) The product title (shortened if necessary), and 4) The condition of the item (e.g., "New" or "Used - Like New").
Can I print FNSKU labels on Avery 5160 sheets or thermal roll printers?
Yes. Our physical label studio includes dedicated presets for standard 30-up sheets (Avery 5160 / 1.0" × 2.625") and 1-click thermal roll printing for Rollo, MUNBYN, and Zebra thermal printers with zero margin clipping.
How do I avoid Amazon inventory placement rejection fees?
Ensure your barcodes maintain high print contrast (pure black on crisp white background), observe the minimum 0.25" quiet zones, do not place transparent tape over the barcode, and completely cover any existing manufacturer UPC/EAN barcodes so only the FNSKU is visible to warehouse scanners.