A trailer-coupler lock should be identified by the latch it secures, not simply by the size of the ball used for towing. Check the stamped model on the old lock, identify whether the coupler has a conventional lever or a surge-brake actuator, and compare the latch opening before ordering.
Recognize the latch before the lock
RC1 offers multiple locking positions to suit selected latch arrangements; measure rather than assuming universal fit.
RC2 and RC3 correspond to different listed lock openings for lever-style couplers.
RC4 and RC5 address wider latch arrangements commonly associated with surge-brake couplers.
Part-number identification table
Compare the number on your existing lock, the coupler mechanism and the opening where the lock passes.
| Model | Coupler-latch design | Listed lock opening or adjustment |
|---|---|---|
| RC1 | Adjustable latch lock | Five locking positions |
| RC2 | Conventional lever coupler | ½-in opening |
| RC3 | Conventional lever coupler | 2-in opening |
| RC4 | Surge-brake coupler | 2½-in opening |
| RC5 | Surge-brake coupler | 3⅜-in opening |
The opening values describe the coupler latch/lock arrangement, not the hitch-ball diameter. RC1 uses adjustable positions; confirm the exact range against the coupler and current manufacturer data.
Confirm fit from your existing hardware
Photograph the coupler from the side and top, note whether there is a surge-brake actuator, and measure the opening for the locking pin. Compare those measurements with the model-specific lock listing.
A lock that passes through a trailer coupler latch is not a substitute for the trailer hitch receiver pin or for a lock that blocks the hitch-ball socket. Confirm the correct application before use.
Compare the five DeadBolt listings
Choose the closest model and open the product listing to review details and current availability.
DeadBolt RC1
Look for the five-position adjustable lock body, then measure the existing coupler latch.
Review item details and availability
DeadBolt RC2
Identify the conventional lever-style latch and its ½-inch lock opening.
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DeadBolt RC3
The listed 2-inch opening is a latch measurement, not the hitch-ball diameter.
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DeadBolt RC4
Look for the surge-brake actuator coupler design and a 2½-inch latch opening.
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DeadBolt RC5
Use the 3⅜-inch latch opening reference when identifying this larger surge-brake style lock.
Review item details and availabilityRelated towing hardware
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