What Size T-Nuts Does The Adarac M-Series Custom Truck Bed Ladder Rack Accept?

Updated 12/09/2025 | Published 11/18/2025

Question:

What size t-nuts and hardware do these rails accept? I havent found the answer anywhere. Part numbers or links would be helpful. Going down the t-slot rabbit hole there are hundreds of sizes and options depending on the extrusion type. Any guidance is appreciated.

asked by: Randall S

Expert Reply:

Hello again, Randall, thanks for reaching out. I looked everywhere and I also was not able to find the exact T-slot size listed anywhere. I do know the bars use standard T-slots, so any accessory that is also made for standard T-tracks should work without issue. The Adarac bars use either 1/4 in or 3/8 in square-nut T-slot hardware. If you reach out directly to Adarac, they may be able to tell you, but they definitely don't list that spec anywhere in their literature.

expert reply by: Jesse M

Jesse M.

12/8/2025

Hey Randall, were you able to confirm the T-slot size with Adarac for your M-Series ladder rack? Knowing what you found could help others trying to match hardware for the same bars.

Randall W.

12/9/2025

@JesseM the 3/8"-16 Spot Weld Center Hole Tab Weld nuts are what Agrifab recommends and I used those. That said, M8 t-nuts/bolts work too. The 8.2mm t-nuts are a little narrow and have to be set first, meaning, they'll spin if you don't have them tightened a little. I am looking for wider t-nuts metric that will fit better. the 8 mm top is a good fit, but the 19mm body can spin. The weld center hole nuts are long enough they don't spin inside the extrusion. Finding a longer metric t-slot nut would be my preference.