Best Trailer Hitch Locks
Our top picks
Master Lock 2866DAT
Fits 1/2 and 5/8 in receivers.
About $19 (masterlock.com list)
Check price at Master Lock ↗Trimax TS32
Fits 1/2 and 5/8 in with sleeve.
Check current price
Check price at Trimax ↗AMPLock
Custom-fit range for many coupler types.
Check current price
Check price at AMPLock ↗
Comparison
| Lock | Best for | Fits | Price (approx.) | |
|---|---|---|---|---|
| Master Lock 2866DAT | Best value receiver lock | 1/2 in and 5/8 in receivers; 2-3/4 in usable pin length | About $19 (masterlock.com list) | Check price ↗ |
| Trimax TS32 | Best for mixed receiver sizes | 1/2 in and 5/8 in receivers (with sleeve) | Check current price | Check price ↗ |
| AMPLock (coupler, gooseneck, kingpin, hitch, latch pin, door locks) | Best heavy-duty option | Coupler (boat, RV, cargo), gooseneck (Bulldog, Atwood), kingpin, hitch 1-1/4 to 3 in, latch pin, barn/roll-up door | Check current price | Check price ↗ |
| Trimax UMAX100 | Pair with: universal coupler lock | Most 1-7/8 in, 2 in and 2-5/16 in couplers | About $130 (trimaxlocks.com list) | Check price ↗ |
How we chose: picks are based on published specifications, materials, fit charts, manufacturer information and patterns in owner reports. We have not lab-tested these locks. Prices are approximate list prices seen on maker sites in October 2026 and change often.
Our picks in detail
Master Lock 2866DAT
Who it is for: Most trucks with 1-1/4 or 2 in receivers.
- Fits 1/2 and 5/8 in receivers
- Rated up to Class III/IV, 10,000 lb (5/8 in)
- Weather seal and cap
- Only protects the hitch, not an unhitched trailer
- 2-3/4 in span too short for some receivers
- Type: Receiver hitch pin lock
- Fits: 1/2 in and 5/8 in receivers; 2-3/4 in usable pin length
- Build: Swivel head, push-to-lock, weather seal and cap, 4-pin cylinder
- Keyed alike: K1 key blank
- Price: About $19 (masterlock.com list)
5/8 in pin rated Class III/IV, 10,000 lb; 1/2 in Class I/II, 3,500 lb.
Check price at Master Lock ↗Trimax TS32
Who it is for: Owners with more than one receiver size.
- Fits 1/2 and 5/8 in with sleeve
- Stainless version available
- Keyed-alike sets
- Price not confirmed on our check
- Type: Universal receiver lock
- Fits: 1/2 in and 5/8 in receivers (with sleeve)
- Build: Steel; stainless SXTS32 version available
- Keyed alike: Keyed-alike sets available
- Price: Check current price
Trimax T5 pin (5/8 in, 3-1/2 in span) fits Class V hitches.
Check price at Trimax ↗AMPLock (coupler, gooseneck, kingpin, hitch, latch pin, door locks)
Who it is for: Owners who want custom-fit security and a fit-finder.
- Custom-fit range for many coupler types
- 5-year warranty with registration
- Fit quiz on maker site
- Prices not confirmed on our check
- Heavy
- Type: Custom-fit lock range
- Fits: Coupler (boat, RV, cargo), gooseneck (Bulldog, Atwood), kingpin, hitch 1-1/4 to 3 in, latch pin, barn/roll-up door
- Build: Heavy-duty steel, custom-fit; fit quiz on site
- Keyed alike: Check per model
- Price: Check current price
5-year warranty with registration (per maker).
Check price at AMPLock ↗Trimax UMAX100
Who it is for: Owners wanting more security than budget locks without custom-fit prices.
- Hardened steel with nylon housing
- Fits 1-7/8, 2 and 2-5/16 in
- Keys alike with other Trimax locks
- Universal fit, not glove-tight
- Bulkier than budget locks
- Type: Universal coupler lock
- Fits: Most 1-7/8 in, 2 in and 2-5/16 in couplers
- Build: Solid hardened steel, ballistic nylon housing, 9/16 in shackle
- Keyed alike: Keys alike to other Trimax locks (per catalog)
- Price: About $130 (trimaxlocks.com list)
Hitch lock vs coupler lock
People use "hitch lock" for two different things. A receiver hitch lock protects the ball mount and keeps your trailer attached to your vehicle while parked. A coupler lock protects the trailer itself when it is unhitched. Most owners end up with both, ideally keyed alike.
Pin size and hitch class
- 1/2 in pin: Class I and II receivers (1-1/4 in), up to 3,500 lb on the Master Lock 2866DAT rating.
- 5/8 in pin: Class III and IV receivers (2 in), the 2866DAT is rated to 10,000 lb in this size.
- Class V / 2-1/2 in receivers: need a longer span, e.g. Trimax T5 (5/8 in x 3-1/2 in span).
Measure the usable length across your receiver before buying; a pin that is too short will not lock.
What to look for
- Swivel or bent-head design so the lock can be fitted in tight spaces.
- Weather cap over the keyway.
- Stainless or plated steel if you tow near salt water.
- Keyed-alike sets if you also run a coupler lock.
- A rating that matches or exceeds your towing setup.
Our pick
Master Lock 2866DAT: best value receiver lock. Most trucks with 1-1/4 or 2 in receivers. If budget matters more, see the other picks above.
Check price at Master Lock ↗FAQs
- What size hitch pin lock do I need?
- Most 2 in receivers use a 5/8 in pin; 1-1/4 in receivers use 1/2 in. Universal locks such as the 2866DAT and TS32 cover both.
- Can a hitch lock be cut?
- Yes, with enough time and the right tools. Hitch locks are a deterrent; pair them with a coupler or wheel lock for real protection.
- Is a hitch lock rated for towing?
- Many are. Check the load rating; for example the 5/8 in pin on the Master Lock 2866DAT is rated Class III/IV, 10,000 lb.