How to Order Prox Cards for Access Control Systems

Thousands of facilities rely on 125kHz prox cards every day — office buildings, industrial sites, hospitals, schools, utilities, you name it. They’re still the most widely installed physical access credential in the U.S., so ordering them should be straightforward. Unfortunately, it usually isn’t.

Between different form factors, print surfaces, slot options, and the programming details your access control system expects, it’s easy for purchasing teams to waste time, overpay, or (worst case) receive cards that don’t even work at the door.

This guide breaks down the key decisions for organizations responsible for ordering prox cards and how to avoid the problems that waste time and money.

Card Format Options: ISO vs. Clamshell

All 125kHz prox credentials use similar internal technology, but the physical format matters depending on workflow and environment:

ISO Printable Prox Cards

• Standard credit-card size: 2.125″x3.375″, 30 mil thick

• Glossy printable surface for employee photos identification

• Works with FARGO, Evolis, IDP, Magicard and most other ID badge printers

• Can be ordered PVC or Composite (Composite is more durable under heat)

Clamshell Prox Cards

• Thicker and more rugged

• Non-printable (apply printable adhesive back cards for photo ID)

• Matte finish

• Often used in harsher environments (industrial, warehousing, utilities)

Prox Key Fobs & Adhesive Stickers

• Smaller form factor for people who don’t want a full size card

• Adhesive stickers mount to existing badges or any other device

• Can use same internal programming as full-size cards

Slotting Options: Hang It or Badge It

If your team carries cards visibly:

• Add a punch slot at the top to hang from a lanyard or strap clip.

If you use badge holders:

• No slot is cleaner and keeps cards stronger for long-term use.

Both ISO and clamshell prox cards can be ordered slotted from the factory.

Prox Card Material: PVC vs. Composite

This choice affects durability more than people realize:

PVC (Standard)
✔ Most common
✔ Lower cost
✘ Can warp from retransfer printer head or crack over months of use

Composite (PVC/PET Blend)
✔ Resists heat from retransfer & laminating printers
✔ Longer lifespan for heavy daily use
✘ Slightly more expensive

*If you use a retransfer printer, have a lamination module or expect cards to last for years Composite is the right choice.

The Most Important Step: Programming Details

This is where many buyers get stuck. Prox cards must be programmed correctly at the factory so your readers actually recognize them. You’ll need three data points at minimum:

1. Format Code (example: H10301, AWID 26W, Kantech 26K, etc.)

2. Facility Code

3. Card Number Range

If you don’t know these, don’t guess — request test cards first or pull info from an existing functioning badge.

Below are some commonly requested 125kHz prox formats supported by IDSuperShop:

If your facility uses a less common format, that’s not a problem — we support dozens of OEM and third-party programming profiles.

*The most popular format from HID works with numerous types of access control systems. Click here to learn more about how to select cards that work for yours.

How to Avoid Bad Orders (And Save Money)

Here’s the reality: Most organizations either don’t know their exact programming details or are overpaying their current supplier.

IDSuperShop solves both issues:

✓ We Provide Free Test Samples

You send us the details for the prox cards you need, or send us an existing badge to decode — we send free cards to test on your system before ordering.

Testing literally takes less than a minute at a door reader and eliminates expensive mistakes.

✓ We Quote Lower Pricing

Because we specialize in physical access credentials, we typically beat standard supplier pricing — especially on high-volume orders for prox cards (minimum 100 cards per order).

✓ We Make Compatibility Easy

Not sure what your system takes? We’ll help you identify format code, facility code, and number ranges from:

• Existing prox cards

• System exports

• Badge logs

• Reader labels

• Manufacturer documentation

What to Have Ready Before Requesting a Quote

If you can provide these, you’ll get the fastest turnaround for new prox cards:

✔ Card Format (ISO printable, clamshell, fob, sticker)
✔ Slotting (slot or no slot)
✔ Material (PVC or Composite)
✔ Programming Format Code
✔ Facility Code
✔ Card Number Range

If you don’t have all of that — don’t sweat it — we can walk you through the missing parts.

Bottom Line

Ordering prox cards doesn’t have to be a guessing game. The right supplier should reduce hassle, lower cost, and guarantee compatibility. IDSuperShop has 20+ years in this industry and helps customers do exactly that.

If your organization wants to:

• Stop overpaying for credentials

• Get compatible cards without trial-and-error

• Test samples before placing a bulk order

• Switch suppliers without risk

Reach out for a free consultation. You’ll get a quote showing lower cost than your current supplier and free samples in a couple of days so you can verify compatibility before buying.

To learn more about how access control systems work or to inquire about an upgrade of an existing system, click to connect with our partners at ADVANTIDGE.