Towing & Hauling
Best Trailer Hitch Locks
The best trailer hitch locks are heavy-duty, weather-sealed pin locks like the Master Lock 377DAT Receiver Lock and the CURT 23086 Coupler Lock, which prevent thieves from unhitching your trailer or stealing your hitch-mounted accessories.
Whether you're towing a boat, parked at a campsite, or just running into the store with a bike rack on your receiver, a hitch lock is cheap insurance against a very expensive loss. The right lock secures both your receiver pin and your trailer coupler so nothing walks off when your back is turned.
Our top pick · Best overall
Master Lock 377DAT Receiver Lock
Quick picks at a glance
- Best overall Master Lock 377DAT Receiver Lock Check price →
- Best coupler lock CURT 23086 Trailer Coupler Lock Check price →
- Best lock set Reese Towpower Hitch Lock Set Check price →
- Best heavy-duty Trimax TS32 Premium Receiver Lock Check price →
What to look for
- Correct pin diameter for your receiver (typically 1/2" for Class I–II, 5/8" for Class III–V)
- Weatherproof or rubber-shielded keyhole to prevent rust and freezing
- Hardened steel construction that resists bolt cutters and saws
- Coupler locks that fit your trailer's ball coupler size
- Keyed-alike options if you want one key for multiple locks
Master Lock 377DAT Receiver Lock
A trusted, weather-protected receiver pin lock that fits most Class III–V hitches and secures bike racks, cargo carriers, and trailers alike.
- Fits 5/8" receiver openings
- Shrouded keyway resists rust and tampering
- Backed by Master Lock's reputation
CURT 23086 Trailer Coupler Lock
A heavy-duty coupler lock that prevents a thief from latching your trailer onto their own ball — essential when leaving a trailer parked.
- Fits a wide range of coupler sizes
- Hardened steel body
- Easy one-handed install
Reese Towpower Hitch Lock Set
A combination set that includes both a receiver pin lock and a coupler lock, often keyed alike so you only manage one key.
- Covers receiver and coupler in one purchase
- Keyed-alike convenience
- Solid value for trailer owners
Trimax TS32 Premium Receiver Lock
A premium, ultra-tough receiver lock built from hardened steel with a deep weather cover — popular with boaters and RV owners.
- Hardened steel resists cutting
- Sealed weather cap
- Long 3-1/2" span fits accessory adapters
Frequently asked questions
What size hitch pin lock do I need?
Most full-size trucks and SUVs use a Class III, IV, or V hitch with a 2" receiver and a 5/8" pin. Smaller crossovers with 1-1/4" receivers typically use a 1/2" pin. Check your vehicle's owner's manual or measure the existing pin to confirm.
Do I need both a receiver lock and a coupler lock?
For maximum security, yes. A receiver lock keeps your hitch or bike rack from being slid out of the receiver, while a coupler lock prevents someone from hooking your unattended trailer up to their own ball and driving away.
Will a hitch lock freeze in winter?
It can if water gets into the keyway. Look for locks with rubber or shrouded weather caps, and apply a graphite or dry PTFE lubricant — not WD-40 — to keep the cylinder turning smoothly in cold weather.
Are hitch locks really effective against theft?
They're not unbreakable, but they're a strong deterrent. Most trailer and hitch-accessory thefts are crimes of opportunity, and a thief will skip a locked rig in favor of an unlocked one nearby.
Can I get hitch locks keyed alike?
Yes — many brands like Master Lock, Reese, and Trimax offer keyed-alike sets so your receiver lock, coupler lock, and even your trailer storage locks all use the same key.
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Top pick: Master Lock 377DAT Receiver Lock Check price →