125 kHz RFID Key Fob ABS - TK4100
Classic ABS key fob with 125 kHz TK4100 chip, widely used for access control and membership cards.
Ordering Information
- MOQ
- 500 pcs
- Lead time
- 10-15 working days
- Sample
- Free sample available, buyer covers shipping
- Packaging
- 100 pcs/bag, 2000 pcs/carton
Technical Specifications
| Chip | TK4100 (EM4200 / T5577 optional) |
|---|---|
| Frequency | 125 kHz |
| Protocol | EM4100-compatible (ISO 18000-2) |
| Memory | 64 bit read-only |
| Read Range | 2-10 cm (reader dependent) |
| Material | ABS, ultrasonically sealed |
| Size | 40 × 32 × 4 mm |
| Weight | 5 g |
| Color | Blue, black, red, yellow (custom Pantone available) |
| Operating Temperature | -20°C to +70°C |
| Encoding | Pre-programmed UID, custom number printing available |
Overview
The HX-KF-125K-01 is a 125 kHz RFID key fob built with the TK4100 chip, designed for access control, attendance and membership identification. The ABS housing is ultrasonically welded, making it waterproof and durable enough for daily carry on a key ring.
Because the chip is read-only with a factory-locked 64-bit UID, this model is the most cost-effective option for projects that only require unique identification without data storage.
Key Features
- Read-only TK4100 chip, stable and widely compatible with 125 kHz readers
- Drop-in compatible with major access control brands (ZKTeco, Hikvision, Suprema, etc.)
- Ultrasonic welding, waterproof and dust resistant housing
- Custom color, laser numbering and logo printing available
- Metal ring or lanyard hole options
- 100% read-rate tested before packing
Applications
- Building and office access control
- Hotel and apartment door locks
- Gym and club membership identification
- Attendance and time tracking
- Parking lot entry management
Customization Options
- Chip: TK4100 (default), EM4200, T5577 (rewritable) on request
- Color: standard blue/black/red/yellow, custom Pantone accepted
- Printing: laser engraving, screen printing, or epoxy dome logo
- Accessory: key ring, lanyard, or adhesive backing
FAQ
Q: Can this key fob be rewritten? A: The TK4100 is read-only and cannot be rewritten. If you need rewritable functionality, choose the T5577 version.
Q: Do you support custom shapes? A: Yes, we offer tooling for custom shapes. Tooling cost depends on the design and is refundable against bulk orders above an agreed quantity.
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Need a Custom Version?
Chip, size, material, color, laser numbering and packaging can all be tailored to your requirement.
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