Thick-body proximity credentials
1.8 mm bodies. Slotted carry. Reader-specific credentials.
RFID clamshell cards are rigid, slotted proximity credentials for access and attendance. The C2T41W reference measures 85.5 × 54 × 1.8 mm, with an ABS shell, PVC backing and a 37 × 63 mm rectangular antenna. Compare it with the C2E42W EM4200 configuration for a long-distance ID reader, or a separate PVC-face thick-card format with LF and HF chip options.
Download technical reference (PDF) ↓
C2T41W physical reference
The standard reference combines an ABS body and PVC backing. Its listed antenna measures 37 × 63 mm, with a wire diameter of 0.05 mm. These dimensions describe C2T41W, not every card with the same outer shape.
The reference mass is approximately 8 g. No dimensional tolerance or numerical slot size is published; use the selected production drawing for a close-fitting holder.
Source: Proud Tek C2T41W specification ↗
Published model and format references
C2T41W and C2E42W are published supplier model references. The printable-face card is a separate listed format without a model number. Keep each row’s dimensions, chip and packing together when requesting samples.
C2T41W
85.5 × 54 × 1.8 mm
Approx. 8 g. The listed identifier is read-only; chip and encoding determine the credential received by the reader.
C2E42W
85.5 × 54 × 1.8 mm
Supplier-listed working temperature: −20 to +60 °C. The reading example is for a reader/card combination, not a distance guaranteed by 1.8 mm thickness.
Published format
86 × 54 × 1.8 mm
The source lists offset, silkscreen, digital and laser printing methods. The finished card still needs to fit the selected printing process and media path.
Original supplier interior photographs
The supplier photographs show both rectangular and circular coils in similar card bodies. Coil shape is one part of the RF design; it does not establish the chip, data format or a guaranteed distance on its own.
Original supplier comparison from the printable-face thick-card listing. The antenna shape changes inside a similar outer shell; this image does not identify a chip or show a dimensional scale.
Original supplier construction photograph. The coil follows the inner body and the module sits near the short edge; added holes or trimming can damage these components.
The supplied oblong slot is near the short edge. The interior photo places the module close to that edge and the antenna around the card body. Avoid cutting, drilling or adding a second hole without an antenna-layout drawing.
Photo source: Proud Tek printable-face thick card ↗. Original images open at full resolution.
Read-only and writable chip comparison
Both appear in published thick-card options, but they do not have the same memory or command set. HF options belong to a different radio interface. The manufacturer data below help identify the credential your reader needs.
| Chip & interface | Memory & behavior | Where it applies |
|---|---|---|
| EM4200LF · 100–150 kHz IC range; card reference at 125 kHz | Read-only laser ROM; 64 / 96 / 128-bit device options The factory-programmed identifier is not rewritten during enrollment. | C2E42W’s listed chip and a C2T41W option. Select the encoding and data rate accepted by the reader. EM Microelectronic datasheet ↗ |
| EM4305LF · 100–150 kHz IC range | 512-bit total EEPROM: 16 × 32-bit words Read/write device with 32-bit UID and password/protection controls. Total EEPROM includes non-user words. | Listed for the PVC-face thick-card format when a compatible writable LF credential is required. EM Microelectronic datasheet ↗ |
| MIFARE Classic EV1 1KHF · 13.56 MHz · ISO/IEC 14443 A | 1 kB total EEPROM: 16 sectors × 4 blocks × 16 bytes Sector trailers hold keys and access conditions; 1 kB is not all free application space. | Technical reference for the listed MIFARE 1K option. Specify the exact IC, UID variant, sector layout and authorized keys. NXP Semiconductors datasheet ↗ |
| NTAG213 / NTAG215 / NTAG216HF · 13.56 MHz · NFC Forum Type 2 | 144 / 504 / 888 bytes user memory Writable NDEF content; manufacturer-programmed UID and 32-bit password protection. | Listed for the PVC-face format. Useful for NFC phone links; not a replacement for a 125 kHz access credential. NXP Semiconductors datasheet ↗ |
RFID frequency and the access-system record are separate. A 125 kHz card still needs the reader’s expected encoding and identifier format. ISO/IEC 14443 A describes the HF options here; it is not the air interface of the EM4200 LF card.
Printed identification and physical fit
C2T41W lists logo and number marking. The separate 86 mm format uses a PVC face and lists offset, silkscreen, digital and laser methods. Specify the actual surface and process; “printable” does not mean every finished shell can pass through a desktop printer.
Keep the visible serial, raw reader value and enrolled credential record distinct. An EM4200’s ID remains fixed when access is granted or revoked; the administrator changes permissions in the system.
Measure against the 1.8 mm finished body, including any applied label. Check the clip through the existing slot and the holder opening. For local printing, use the printer manufacturer’s approved media thickness and feed requirements.
Technical documents
The reference includes the named models, separate printed-face format, original construction photos and chip-manufacturer links.
Download clamshell card reference ↓PDF · reviewed 16 September 2026
Custom orders & samples
Select the card and application. On the next page, add quantity, reader model, required identifier format, artwork and destination.
For replacement orders, include the current credential specification and enrollment method. Pricing, MOQ, sample charges and delivery schedule are stated for the quoted configuration.
Sample ordering terms →No. EM4200 uses factory-programmed laser ROM. Enrolling or deleting a card in an access-control database changes the system record, not the chip identifier. EM4305 is a different, writable LF device with 512-bit total EEPROM; its reader commands and configuration must be supported by the intended system.
The C2T41W listing gives 5–13 cm depending on the reader. C2E42W gives 0.8–1.2 m specifically on a long-distance ID reader. These describe different card-and-reader conditions. Card thickness alone does not produce that distance; antenna geometry, reader field, orientation and installation all affect the result.
Only if that printer supports the finished card’s thickness, surface and feed path. A rectangular card outline does not establish printer compatibility. The separate PVC-face format is listed for several printing methods, but this is not approval for every desktop printer. Provide the printer model for locally printed cards or order the required marking on the finished card.
No. Frequency is only one requirement. The reader must recognize the chip’s modulation, data rate and identifier format, and the controller must enroll the expected credential value. A number printed on the shell may be a serial or a formatted representation, so compare it with the value actually received by the system.
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