Trailer Pin Locks (Locking Hitch Pins)
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 | 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 universal with sleeve | 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 | 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 ↗ |
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 ↗Measuring for a pin lock
- Pull the existing pin and measure its diameter.
- Measure the usable length across the outside of the receiver.
- Choose a lock with at least that span (the 2866DAT has 2-3/4 in usable length; Trimax T5 has 3-1/2 in for Class V).
Latch pins vs hitch pins
A coupler latch pin lock is a small lock that goes through the latch hole on your coupler so it cannot be opened. It is not the same as a receiver hitch pin. See trailer latch locks.
Keyed-alike tip
Many brands sell keyed-alike sets (coupler lock plus pin lock). Proven offers keyed-alike across its range; Trimax keys many locks alike. One key is easier at a boat ramp at dawn.
Our pick
Master Lock 2866DAT: best value. 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 is a standard hitch pin?
- 5/8 in for most 2 in receivers; 1/2 in for 1-1/4 in receivers.
- Will a pin lock rust?
- Look for a weather cap and stainless or plated steel; lubricate the cylinder a few times a year.
- Do I need a pin lock if I have a coupler lock?
- They protect different things: the pin lock protects the hitched setup, the coupler lock the unhitched trailer.