Master Lock Trailer Hitch and Receiver Lock Combo - Heavy-Duty

In this review the Master Lock combo pack is presented as a practical security upgrade for trailer owners who tow regularly. The set includes a trailer coupler lock that fits 1-7/8 in, 2 in and most 2-5/16 in couplers and a swivel head receiver lock with 1/2 in and 5/8 in pins, giving coverage for a wide range of hitch setups. The single biggest reason to buy is the combination of physical theft deterrence and weather resistance: the coupler lock resists picking and prying while the receiver lock offers a weather tough seal and a push-to-lock convenience that makes secure towing straightforward.

Key Features

• Multi-size coupler fit: The coupler lock fits 1-7/8 in, 2 in and most 2-5/16 in trailer couplers so one lock covers many common trailer tongues.
• Advanced lock mechanism: The coupler lock uses an advanced mechanism designed to resist picking and prying for improved theft deterrence.
• Rust-resistant construction: The coupler lock is made from zinc to resist rust and corrosion for longer outdoor life.
• Rated hitch pins: The receiver lock pins are sized 1/2 in and 5/8 in with ratings appropriate for Class I-IV towing to match common trailer classes.
• Push-to-lock convenience: The swivel head receiver lock features a push-to-lock mechanism so you can secure the pin quickly and remove the key to confirm it is locked.
• Weather protection: A snap-on cover and Weather Tough seal keep dirt and moisture out of the keyway for more reliable operation in wet conditions.

Who It's For

This combo is best for vehicle and trailer owners who want straightforward physical security for both coupler and receiver connections, including owners of small utility trailers, campers and many RV setups. It suits users who value ease of use while maintaining a solid deterrent against opportunistic theft.

It is less suitable for owners who require an exact custom fit for unusual or nonstandard couplers, or for those who need an integrated alarmed system; some customers reported mixed fit results on certain trailers, so verify fit before depending on it for a niche coupling type.

Pros & Cons

Pros

• Solid build quality and corrosion resistance from zinc construction increases longevity outdoors.
• Receiver lock offers convenient push-to-lock operation and a rotating head so the key faces forward for easier access.
• Good security features: advanced coupler locking mechanism and a four-pin cylinder in the receiver lock reduce picking risk.
• Weather Tough seal and snap-on cover protect the keyway from dirt and moisture.

Cons

• Fit may be loose on some trailer couplers; customers reported mixed fit, so trial fit is recommended.
• The package covers common sizes but may not suit rare or proprietary coupler shapes without checking compatibility.

Specifications

Our Verdict

The Master Lock trailer hitch and receiver lock combo is a practical, value-oriented choice for most trailer owners who need reliable physical theft deterrence and weather resistance. It pairs a corrosion-resistant coupler lock with a convenient push-to-lock receiver pin that is rated for common towing classes, making it a sensible purchase for everyday towing and storage. Check fit on uncommon couplers, but for the majority of users this combo offers solid build quality and easy operation.

Frequently Asked Questions

Will the coupler lock fit my trailer?
The coupler lock fits 1-7/8 in, 2 in and most 2-5/16 in couplers; measure your coupler and try a test fit since some customers reported mixed fit results.

How does the receiver lock resist weather?
The receiver lock uses a Weather Tough seal and a snap-on cover to keep dirt and moisture out of the keyway for more reliable operation.

Are the receiver pins strong enough for heavy trailers?
The 1/2 in pin is rated up to 3,500 lbs for Class I and II; the 5/8 in pin is rated up to 10,000 lbs for Class III and IV towing.