Brother TJ6421TN label printer Direct thermal / Thermal transfer Colour 203 x 300 DPI 304.8 mm/sec Wired Ethernet LAN Wi-Fi Bluetooth

The Brother TJ6421TN is a 6-inch industrial label printer that combines direct thermal and thermal transfer printing to meet the demands of transport, logistics and manufacturing environments. Designed for SSCC product labelling, it provides durable construction, a 203 x 300 dpi resolution option and a maximum print speed of 304.8 mm/sec to support high-throughput label production for picking, pallet marking and traceability tasks.

Advantages

The TJ6421TN offers flexible printing modes (direct thermal and thermal transfer), multiple connectivity options (USB, Ethernet LAN, Wi‑Fi, Bluetooth 4.2) and a wide supported print width up to 172.7 mm. It includes an LED display for status feedback and supports a broad set of barcode symbologies, making it suitable for standardized logistics labelling. Optional accessories such as an internal rewinder and GPIO interface extend its integration into production and warehouse lines. A five-year return-to-base warranty is provided as standard.

Suitable for

• Pallet and SSCC labelling in logistics centres
• Warehouse picking labels and shipping labels
• Product and component labelling in manufacturing
• High-volume barcode and GS1 label production

Key specifications

• Print technology: Direct thermal and thermal transfer
• Resolution: up to 203 x 300 dpi
• Maximum print width: 172.7 mm
• Print speed: up to 304.8 mm/sec (12 in/sec)
• Connectivity: USB, Ethernet LAN, Wi‑Fi, Bluetooth 4.2 (Wired available)
• Display: LED (4.3" / 10.9 cm)
• Weight: 17.9 kg
• Colour: Black
• Built-in barcodes: QR, PDF417, DataMatrix, Code 128, EAN/UPC, GS1 DataBar and many more
• Optional accessories: internal rewinder (5" OD), GPIO interface, Wi‑Fi/Bluetooth module
• Warranty: 5 years return-to-base

How to use

Install the printer on a stable surface near a power source and the host device. Choose direct thermal media for short-term labels or install a thermal transfer ribbon for durable, long-lasting labels. Load media according to the user manual, select the required resolution and print width in the printer driver or device settings, and connect via USB, Ethernet, Wi‑Fi or Bluetooth. Use the LED display to monitor status and error messages; consult the manual for media calibration and print head maintenance.

Recommendations

For reliable long-term performance, use media and ribbons recommended by Brother, keep the print head clean, perform regular calibration after media changes, and install optional rewinder or GPIO modules when integrating the printer into automated label production lines.