Keri Systems NXT Compatible Cards & Fobs
Keri's modern 125 kHz platform: NXT credentials speaking Keri's own card-to-reader protocol on NXT-series readers — the successor generation to MicroStar, deployed across schools, offices, and multi-door commercial systems.
Does American Key Cards make Keri Systems NXT compatible cards?
Yes — American Key Cards supplies unbranded Keri Systems NXT compatible cards and key fobs (AKC Keri NXT-Compatible Proximity Card), encoded to your facility code and card-number range and ready to use on your existing Keri Systems readers. No hardware changes and no dealer account required.
- 125 kHz
- Frequency
- RFID prox (Keri NXT proprietary protocol)
- Technology
- 1
- Bit format
- 3+
- OEM part nos.
- American Key Cards
- Order from
NXT is what Keri built after MicroStar: a cleaner controller architecture, a new reader line, and a proprietary credential protocol that isn't standard Wiegand on the wire. For facilities, day-to-day reality is simple — NXT readers read NXT credentials, and the NXT-C card, NXT-I ISO card, and NXT-K key tag are the three bodies the fleet is issued in. Replacement pressure comes from turnover, and the aftermarket for NXT-compatible stock is well established. We supply unbranded NXT-compatible cards and key tags programmed to work with your NXT readers and enroll through your Keri software like original stock. As with every proprietary format we handle, we confirm your system details — reader models and a sample credential's numbering — before production, and both the protocol behavior and your numbering are verified on the bench before shipment.
Keri Systems NXT specifications
- System brand
- Keri Systems
- Technology
- Passive RFID proximity (Keri NXT proprietary protocol)
- Frequency
- 125 kHz
- Credential platform
- Keri NXT-family 125 kHz transponder using Keri's proprietary card-to-reader protocol
- Bit formats
- Keri NXT proprietary format (not standard 26-bit Wiegand)
- OEM part numbers
- NXT-C, NXT-I, NXT-K
Specifications reviewed August 2026
Our compatible Keri Systems NXT credentials
American Key Cards manufactures unbranded credentials engineered to work with your existing Keri Systems readers — no hardware changes, encoded to your facility code and card-number range before they ship.
Full specifications, form factors and ordering FAQ: Specialty & legacy prox credentials
American Key Cards is an independent manufacturer of unbranded, compatible-by-specification credentials. We are not affiliated with, endorsed by, or sponsored by Keri Systems, and we never supply OEM-branded product — for brand-original credentials, order from Keri Systems or an authorized dealer. Brand names appear only to identify compatibility, and all trademarks remain the property of their respective owners.
Where Keri Systems NXT is used
- Commercial buildings using Keri NXT access-control systems
- Multi-door installations with NXT-1R, NXT-3R, or NXT-5R readers
- Employee badge programs replacing lost or damaged NXT credentials
- Schools and universities with Keri NXT infrastructure
Works with these readers
Related formats
You might also need
Keri Systems MS Format (MicroStar)
Keri's original proprietary format: MicroStar credentials for MS-series readers and PXL-500 Tiger controllers — one of the most widely deployed small-commercial access platforms of its era, still running in thousands of buildings.
View compatible cardsKeri Systems PXL-250 / Keri Classic 26-bit (K-Format)
The open-standard side of the Keri world: KC-26X-class credentials in plain 26-bit H10301 Wiegand, used on PXL-250 controllers and IntelliProx installations — and readable by any standard 26-bit system.
View compatible cardsHID Prox H10301 (Standard 26-Bit)
The most widely deployed proximity format in North America: 26-bit Wiegand — an 8-bit facility code plus 16-bit card number — on the 125 kHz HID Prox platform, live on millions of doors.
View compatible cardsKeri Systems NXT — FAQ
Are Keri NXT cards the same as standard 125 kHz proximity cards?
No. They share the frequency, but NXT uses Keri's own card-to-reader protocol rather than a standard Wiegand-format air interface, so generic 125 kHz cards won't register on NXT readers. Replacements must be NXT-compatible specifically.
Can I use NXT credentials on non-Keri readers?
Not in native NXT mode — the protocol is Keri's. Facilities running mixed-brand doors typically issue dual-credential badges or standardize door hardware; tell us your mix and we'll lay out the practical options for your fleet.
What's the difference between NXT-C, NXT-I, and NXT-K?
Form factor only: NXT-C is the standard card, NXT-I the printable ISO body, NXT-K the keyring tag. The protocol and enrollment behavior are identical — choose bodies by how your people carry them.
How do you verify compatibility before shipping?
We program to your fleet's numbering from a sample credential or your Keri software's records, then bench-verify the protocol behavior against NXT-reader expectations. If any configuration detail suggests your site needs OEM-channel stock instead, we say so before you spend anything.