A receiver pin is the one small part standing between your trailer and a thief with a screwdriver. A plain clip pin pops out in seconds, so a locking trailer hitch pin replaces it with a keyed barrel that holds your ball mount, bike rack, or cargo carrier firmly in the receiver. The right one resists prying, shrugs off road salt, and still turns smoothly after a winter of grime.
We looked at the locking pins buyers actually trust, focusing on real-world durability rather than spec sheets. We checked how each one fits both 1/2 inch and 5/8 inch receivers, how well the lock cylinder survives weather, and how easy it is to insert and remove with cold or gloved hands. Below are seven picks that earn their place, ranked best first, with the genuine weaknesses each one carries.
| Photo | Product | Score | Buy |
|---|---|---|---|
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CURT 23022 Anti-Rattle Locking Hitch Pin Best Overall Fits 5/8 in receivers, anti-rattle wedge, weather-resistant lock cover |
9.5 | 🛒 Check Price |
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Trimax TS32 Premium Ratcheting Hitch Lock Most Secure Ratcheting collar adjusts to receiver, hardened steel pin, dual-bent design |
9.3 | 🛒 Check Price |
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Master Lock 377KA Receiver Lock Best Trusted Brand Fits 1/2 in and 5/8 in receivers, swivel head, keyed-alike option |
9.1 | 🛒 Check Price |
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Reese Towpower 7014700 Professional Locking Hitch Pin Best Value Fits 5/8 in receivers, chrome-plated steel, weatherproof rubber cover |
8.9 | 🛒 Check Price |
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AMPLOCK U-BRP218 Hitch Pin Lock Most Weather-Resistant Stainless body, fully enclosed lock, fits 5/8 in receivers |
8.7 | 🛒 Check Price |
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Andersen Hitches 3496 Aluminum Locking Hitch Pin Best Lightweight Pick Aluminum and stainless build, rust-free, fits 5/8 in receivers |
8.4 | 🛒 Check Price |
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Tow Ready 63201 Gorilla Guard Locking Pin Best for Heavy-Duty Towing Thick hardened pin, fits 5/8 in receivers, protective lock shroud |
8.1 | 🛒 Check Price |
1. CURT 23022 Anti-Rattle Locking Hitch Pin: Best Overall
The CURT 23022 is the pin we kept reaching for because it solves two problems at once. It locks your ball mount against theft and uses a built-in wedge that pushes the shank tight against the receiver walls, so the constant clunk you get on rough roads simply disappears. For anyone who tows a loaded trailer or a heavy hitch-mounted rack, that quieter, tighter connection is genuinely noticeable on the highway.
The honest weakness is fit. This is a 5/8 inch pin designed for the larger Class III and IV receivers, so it will not work in a small 1/2 inch opening and it does not ship with a reducer sleeve. You also need to spend a few seconds seating the anti-rattle wedge each time, which is a minor habit to learn. Once it is in, the rubber-capped lock keeps weather out and the key turns cleanly even after months of salt and rain.
- Integrated anti-rattle wedge tightens the ball mount in the receiver
- Rubber lock cover keeps grit and moisture out of the cylinder
- Corrosion-resistant coating built for year-round towing
Pros: Kills receiver rattle and locks in one part; Lock turns smoothly even after weather exposure; Trusted brand with consistent fit
Cons: Fits 5/8 in only, not 1/2 in receivers; Anti-rattle wedge takes a moment to seat correctly
2. Trimax TS32 Premium Ratcheting Hitch Lock: Most Secure
The Trimax TS32 is built for owners who treat theft protection seriously. Instead of relying on a fixed barrel, it uses a ratcheting collar that you tighten down against the receiver, pulling the hardened steel pin snug so there is no wobble for a thief to exploit and no rattle on the road. The bent, dual-arm shape and thick steel make it one of the hardest pins on this list to defeat with hand tools.
That security comes with trade-offs worth knowing. The TS32 is noticeably heavier and chunkier than a plain pin, so it is more to carry and store, and the ratchet threads can pick up road grit that makes the collar stiff until you wipe and lubricate it. If you want the strongest deterrent and do not mind a little maintenance, this is the pin a thief is most likely to walk away from.
- Ratcheting nut snugs the pin to remove play and rattle
- Hardened steel bent pin resists cutting and prying
- One pin adapts to a range of receiver openings
Pros: Ratcheting collar removes slop for a rattle-free fit; Heavy hardened steel feels nearly impossible to pry; Adjustable design suits multiple receiver sizes
Cons: Heavier and bulkier than a simple straight pin; Ratchet mechanism needs an occasional clean to stay smooth
3. Master Lock 377KA Receiver Lock: Best Trusted Brand
The Master Lock 377KA is the easy recommendation when you are not sure which receiver size you have, because it ships with an adapter that lets one pin serve both 1/2 inch and 5/8 inch openings. The swivel locking head is a smart touch, letting you find the key slot even when the receiver sits close to a bumper or skid plate. You can also order it keyed alike, so a single key runs your hitch lock, coupler lock, and cable lock together.
The main thing to watch is the cylinder in harsh weather. Like most receiver locks at this level, the keyway can collect salt and freeze up if you ignore it, so a yearly shot of lock lubricant keeps it turning sweetly. Do that small bit of upkeep and the 377KA delivers reliable, flexible security from a brand that has earned its reputation in locks.
- Includes adapter to fit both 1/2 in and 5/8 in receivers
- Swivel locking head clears bumpers and tight spaces
- Available keyed alike to match other Master Lock products
Pros: Fits the widest range of receivers out of the box; Swivel head makes locking easy in cramped spots; Backed by a name most buyers already know
Cons: Lock cylinder needs lubrication to keep out winter grit
4. Reese Towpower 7014700 Professional Locking Hitch Pin: Best Value
Reese is a name that has been on tow gear for decades, and this professional locking pin keeps things refreshingly simple. The chrome-plated steel shank slides into a 5/8 inch receiver, the cap flips up, and a quarter turn of the key locks your ball mount in place. It is the no-nonsense choice for someone who wants dependable security and a finish that resists rust without paying for extra features they will not use.
Because it is a straightforward pin, it does not include the anti-rattle wedge some rivals offer, so you may still hear a little movement on washboard roads. It is also a 5/8 inch part with no reducer for smaller receivers. For most trucks and SUVs running a standard Class III or IV hitch, though, the Reese covers the basics well and gives strong value for the money.
- Chrome-plated steel pin resists rust and looks clean
- Weatherproof rubber cap protects the key cylinder
- Straightforward push-and-turn locking with two keys
Pros: Solid theft protection without overcomplication; Chrome finish holds up well against corrosion; Comes with a spare key included
Cons: 5/8 in fit only, no size adapter; Plain barrel offers no anti-rattle function
5. AMPLOCK U-BRP218 Hitch Pin Lock: Most Weather-Resistant
If you live near the coast or drive through salted winter roads, the AMPLOCK U-BRP218 is built for your environment. The stainless steel body resists the rust that eats cheaper pins, and the lock cylinder is fully enclosed inside the housing so there is no exposed keyway for grit to clog or for a thief to drill easily. It reads as a sealed unit rather than a pin with a lock bolted on.
The price of that protection is bulk and a single size. The enclosed head is chunkier than a slim straight pin, so it can feel tight in a crowded receiver area, and it only fits 5/8 inch openings with no adapter in the box. For buyers whose biggest enemy is corrosion rather than tight clearance, the AMPLOCK is a very worry-free pins you can leave outside year-round.
- Stainless steel body shrugs off rain, salt, and UV
- Fully enclosed cylinder hides the keyway from attack
- Push-button operation with no exposed threads
Pros: Outstanding corrosion resistance for coastal and winter use; Enclosed lock gives tools nothing to grab; Clean, tamper-resistant one-piece design
Cons: Sized for 5/8 in receivers only; Bulkier head than a slim straight pin
6. Andersen Hitches 3496 Aluminum Locking Hitch Pin: Best Lightweight Pick
Andersen takes a different approach with the 3496 by skipping steel entirely. The combination of aluminum and stainless components means this pin simply cannot rust, and it weighs far less than the hardened steel options, which is a real plus if you pull a rack on and off several times a week. The low-profile head also tucks neatly into crowded receiver areas where a bulky lock would not fit.
Honesty requires noting that aluminum is softer than hardened steel, so this pin leans on being a strong visible deterrent rather than the absolute toughest barrier against a determined attack with the right tools. It is also a 5/8 inch part only. For everyday towing where convenience, weight, and zero corrosion matter most, the Andersen is a smart, good-looking choice that you will actually enjoy using.
- Aluminum and stainless construction will not rust
- Light weight makes frequent removal easy
- Low-profile low-profile head fits tight receiver areas
Pros: Completely rust-free materials; Noticeably lighter and easier to handle; Compact head clears bumpers and racks
Cons: Aluminum is softer than hardened steel pins; 5/8 in fit only, premium feel for the design
7. Tow Ready 63201 Gorilla Guard Locking Pin: Best for Heavy-Duty Towing
The Tow Ready 63201 Gorilla Guard is the pick when you are pulling something serious. The hardened steel pin is thick and rated for heavy loads, and a protective shroud wraps the lock so it can take a knock from a swinging chain or a careless boot without giving up. In a Class IV receiver under a loaded toy hauler or equipment trailer, this is the kind of pin that inspires confidence.
That heavy-duty build is also its drawback for casual users. It is one of the heavier pins here, and the tight tolerance that makes it feel so solid means it can need a gentle tap to seat if the receiver is full of dried mud. Keep the bore clean and this pin rewards you with rugged, dependable holding power that lighter designs cannot match.
- Thick hardened steel pin rated for heavy loads
- Protective shroud shields the lock from impacts
- Includes two keys and a snug weatherproof cap
Pros: Beefy pin suited to large trailers and high tongue weights; Shrouded lock resists prying and knocks; Reliable fit in Class IV receivers
Cons: Heavier than most pins on this list; Tight tolerance can need a tap to insert when dirty
Frequently Asked Questions
What is the difference between a 1/2 inch and 5/8 inch locking hitch pin?
The number refers to the diameter of the pin and therefore the size of the hole in your receiver. Smaller Class I and Class II receivers, often found on cars and compact SUVs, typically use a 1/2 inch pin, while larger Class III, IV, and V receivers on trucks and big SUVs use a thicker 5/8 inch pin. Many locking pins are sold in 5/8 inch size with a 1/2 inch adapter sleeve so one product covers both. If you are unsure, measure the hole in your receiver or check whether your ball mount slides into a 1.25 inch or 2 inch opening, since the larger opening almost always pairs with the 5/8 inch pin.
Will a locking hitch pin stop my trailer or bike rack from being stolen?
A locking pin is a strong deterrent rather than an absolute guarantee, and that is true of every lock on the market. It replaces the easy-to-pull clip pin with a keyed barrel that a thief cannot remove in seconds, so a casual opportunist will move on to an easier target. A determined thief with the right power tools can defeat almost any pin given enough time, so the goal is to make your setup slower and more obvious to attack than the next vehicle. Pairing a hardened locking pin with a coupler lock and parking in lit, visible areas gives you layered protection that works well in practice.
Why does my ball mount rattle even with a locking pin installed?
Rattle happens because there is always a small gap between the ball mount shank and the inside walls of the receiver, and a plain pin does nothing to close that gap. On rough roads the shank knocks back and forth and you hear a clunk. Anti-rattle locking pins, like the CURT 23022 or the ratcheting Trimax TS32, add a wedge or a tightening collar that pushes the shank firmly against the receiver to remove that play. If your current pin is a simple straight barrel, switching to an anti-rattle design is the cleanest way to silence the noise without buying extra clamps or foam.
How do I keep a locking hitch pin from rusting or freezing up?
Two simple habits make a big difference. First, choose the right material for your climate. Stainless or aluminum pins like the AMPLOCK and Andersen resist corrosion far better than basic steel if you face coastal air or salted winter roads. Second, give the lock cylinder a yearly shot of dry lock lubricant or a graphite product, and keep the rubber weather cap seated over the keyway when the pin is not in use. That cap is your main defense against grit and moisture working into the mechanism. If a pin does freeze, warm the cylinder gently and apply lubricant rather than forcing the key, which can snap it.
Can one key work for all my hitch and trailer locks?
Yes, and it is a feature worth looking for if you run several locks. Many brands offer keyed-alike products, meaning you can buy a hitch pin, a coupler lock, and a cable lock that all open with the same key. Master Lock is especially well known for this, and ordering matching keyed-alike items means one key on your ring handles your entire towing setup instead of a confusing bundle. Just confirm the keyed-alike option at purchase, since identical-looking products are often sold keyed differently by default and cannot be re-matched afterward.
Our Verdict
For most drivers, the CURT 23022 Anti-Rattle Locking Hitch Pin is the best all-around choice because it locks out thieves and silences receiver rattle in a single, weather-sealed part that simply works. If your top priority is the toughest possible deterrent, the Trimax TS32 Premium Ratcheting Hitch Lock is the runner up, trading a little extra bulk and upkeep for hardened steel and a ratcheting fit that leaves nothing loose for a thief to exploit. Match the pin diameter to your receiver, keep the cylinder lubricated, and either one will guard your trailer for years.
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