What AMPLock King Pin Lock Is Best For A Curt Rota-Flex Kingpin?

Published 10/06/2026

Products Featured in This Question

AMPLock King Pin Lock for 5th Wheel Trailers - Conical - Ductile Cast Iron

(29)

$250.00

AMPLock King Pin Lock for PullRite and Sidewinder 5th Wheel Pin Boxes - Steel

(29)

$155.00

Question:

Will the AMP66FR fit the Curt Rota-flex kingpin?

asked by: Louis

Expert Reply:

Hey Louis, thanks for reaching out. Yes, we do have a king pin lock that will work with your Curt Rota-Flex pin box. I recommend the AMPLock King Pin Lock # AMP77FR. It is designed for a standard 2" fifth-wheel king pin like the one used on the Rota-Flex and gives you a heavy-duty lock that is resistant to picking, drilling, cutting, and freezing.

The # AMP66FR you were originally looking at is designed for more specialized setups like PullRite capture plates and Sidewinder-style pin boxes, so # AMP77FR is the better choice for your Rota-Flex.

Where do you usually park the fifth-wheel when it’s unattended or stored?

expert reply by: Jesse M