We researched and compared the top trailer hitch locking pins based on manufacturer specifications, industry safety standards, and aggregated owner feedback. Our evaluation focuses on materials, locking mechanism reliability, corrosion resistance, and ease of use. Whether you tow occasionally or professionally, this guide helps you choose a pin that secures your hitch without compromising safety.
| Photo | Product | Score | Buy |
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Trimax UMAX100 Best Overall 5/8 inch diameter, 2-3/4 inch usable length, stainless steel body, hardened steel lock cylinder |
9.0 | 🛒 Check Price |
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Master Lock 3791DAT Best Value 5/8 inch diameter, 2-1/2 inch usable length, hardened steel, vinyl coated grip |
8.4 | 🛒 Check Price |
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Reese Towpower 7093200 Best Heavy Duty 5/8 inch diameter, 3 inch usable length, zinc plated steel, double locking balls |
8.7 | 🛒 Check Price |
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CURT 23500 Best Stainless Steel 5/8 inch diameter, 2-1/2 inch usable length, 304 stainless steel, disc lock |
8.1 | 🛒 Check Price |
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B&W Trailer Hitches B&W Locking Pin Best Security 5/8 inch diameter, 2-3/4 inch usable length, hardened steel, patented locking system |
9.4 | 🛒 Check Price |
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Dutton-Lainson 50001 Best Budget 5/8 inch diameter, 2-1/2 inch usable length, zinc plated steel, keyed lock |
7.3 | 🛒 Check Price |
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ProTecta 6300 Best for Saltwater 5/8 inch diameter, 2-3/4 inch usable length, 316 stainless steel, silicone weather cover |
7.8 | 🛒 Check Price |
1. Trimax UMAX100: Best Overall
The Trimax UMAX100 consistently earns top marks from owners for its all-stainless build and reliable double-ball locking mechanism. In our evaluation of spec sheets and owner feedback, its corrosion resistance stands out, making it a favorite for boat trailers and salt-exposed tow trucks. The flush fit reduces accidental disengagement, and the hardened cylinder resists picking and drilling attempts.
However, this pin is not the cheapest option. Budget-conscious buyers may find the price steep, and the stainless steel body can be slightly heavier than aluminum alternatives. For those who rarely tow or store trailers indoors, a simpler zinc-plated pin may suffice. Skip this if you need a keyed-alike set for multiple trailers, as Trimax keys are unique per pin.
- Solid stainless steel construction resists rust and corrosion, ideal for saltwater environments.
- Hardened steel lock cylinder with double ball locking mechanism provides robust theft deterrence.
- Flush-fit design minimizes snagging and fits most standard couplers and receivers.
Pros: Exceptional corrosion resistance; Smooth locking action even after years of use
Cons: Higher upfront cost compared to basic pins
2. Master Lock 3791DAT: Best Value
The Master Lock 3791DAT is a popular choice for casual towers who want reliable security without breaking the bank. Based on owner feedback, the hardened steel shackle withstands bolt cutters better than many budget pins. The key retaining mechanism is a smart safety touch that forces the user to lock before removing the key, reducing the chance of forgetting to secure the hitch.
That said, the vinyl coating is not as durable as powder coating or stainless steel. In hot climates or with frequent use, it may crack and peel. Also, the lock cylinder is not as pick-resistant as higher-end models. If you tow in extreme conditions or need maximum theft protection, consider a stainless steel alternative.
- Hardened steel shackle resists cutting and sawing.
- Vinyl coated grip provides easy handling and protects hitch finish.
- Key retaining design ensures lock is not left unlocked.
Pros: Very affordable without sacrificing basic security; Key retaining feature prevents accidental unlocked towing
Cons: Vinyl coating can peel over time in harsh sun
3. Reese Towpower 7093200: Best Heavy Duty
The Reese Towpower 7093200 is engineered for heavy loads and frequent use, making it a solid pick for tow trucks and large trailers. Our research shows its extended 3-inch shank accommodates thick receiver walls and allows stacking of multiple hitch accessories. The double ball lock holds tight even on rough roads, and the zinc plating holds up well in normal conditions.
However, the zinc plating is not as corrosion-proof as stainless steel. For marine or road salt exposure, you may see rust after a few seasons. Also, the lock cylinder is basic and can be vulnerable to picking. If you need ultimate corrosion resistance or higher security, step up to a stainless steel model.
- Extra-long 3-inch usable length fits thick receivers and multiple accessories.
- Double ball locking mechanism provides positive engagement and resists vibration.
- Zinc plating offers good corrosion resistance for most environments.
Pros: Long shank fits heavy-duty tow truck setups; Smooth, reliable locking action
Cons: Zinc plating may wear over time in salt conditions
4. CURT 23500: Best Stainless Steel
The CURT 23500 is a premium stainless steel pin that excels in harsh environments. Based on spec sheets and owner reviews, the 304 stainless body and disc lock provide top-tier rust protection and security. The dust cover keeps debris out of the lock, extending its life. This is a great choice for boat trailers or any tow vehicle exposed to moisture and salt.
On the downside, the usable length is only 2.5 inches, which may be too short for some heavy-duty receivers or when using multiple hitch attachments. Also, the disc lock can be stiff to operate when new. If you have a standard receiver and prioritize corrosion resistance above all, this is a strong option. Skip it if you need a longer shank.
- Full 304 stainless steel construction for maximum corrosion resistance.
- Disc lock design with hardened steel cover resists drilling and prying.
- Includes two keys and a dust cover for the lock.
Pros: Excellent corrosion resistance for saltwater use; Disc lock offers superior pick resistance
Cons: Shorter usable length may not fit thick receivers
5. B&W Trailer Hitches B&W Locking Pin: Best Security
The B&W Trailer Hitches locking pin sets the benchmark for security in our evaluation. Its patented design uses a hardened steel sleeve that rotates freely around the lock cylinder, making it nearly impossible to cut or pry off. Owner feedback consistently highlights the peace of mind this pin provides, especially for expensive trailers or tools. The powder coat finish holds up well against scratches and corrosion.
However, this level of security comes at a premium. It is one of the more expensive pins on the market. Additionally, the unique locking mechanism may require a brief learning curve for first-time users. If your trailer is stored in a low-risk area or you are on a tight budget, a simpler pin may be adequate. But for maximum protection, this is the top choice.
- Patented locking mechanism with hardened steel sleeve protects against cutting and prying.
- Tool-free installation with a simple push-to-lock operation.
- Corrosion-resistant finish with a durable powder coat.
Pros: Extremely high theft resistance; Smooth and quick locking action
Cons: Higher price point
6. Dutton-Lainson 50001: Best Budget
The Dutton-Lainson 50001 is a no-frills locking pin that gets the job done for light duty and occasional towing. Based on owner feedback, it is functional but not built to last. The zinc plating offers minimal protection against rust, and the lock is basic. For someone who tows a small utility trailer a few times a year and stores it indoors, this pin offers acceptable security at a rock-bottom price.
However, this pin is not suitable for frequent use, salt exposure, or high-theft areas. The lock can fail after repeated use, and the finish may chip. If you tow regularly or leave your trailer unattended, invest in a higher-quality pin. Skip this if you need reliability or corrosion resistance.
- Simple keyed lock with basic security for light use.
- Zinc plating provides some corrosion resistance.
- Very low cost makes it accessible for occasional towers.
Pros: Extremely affordable; Works as a basic deterrent
Cons: Low durability zinc finish may rust quickly; Lock cylinder is easy to pick or break
7. ProTecta 6300: Best for Saltwater
The ProTecta 6300 is specifically designed for saltwater use, with 316 stainless steel that outperforms common 304 in corrosion resistance. Our research indicates that this pin holds up well after seasons of boat trailer use. The included silicone cover keeps the lock mechanism clean and dry, which is critical for longevity in marine environments.
However, the ProTecta 6300 is harder to find and often priced higher than comparable 304 stainless pins. Additionally, the lock cylinder is not as secure as some competitors. If you tow in freshwater only or store your trailer indoors, a 304 stainless pin may suffice. But for serious saltwater exposure, this is a worthy investment.
- Marine-grade 316 stainless steel resists saltwater corrosion better than 304.
- Includes silicone weather cover to protect lock from moisture and dirt.
- Smooth operation even after prolonged salt exposure.
Pros: Superior corrosion resistance for marine environments; Weather cover extends lock life
Cons: Higher cost than standard stainless pins; Limited availability on Amazon
Frequently Asked Questions
What size trailer hitch locking pin do I need?
Most standard receivers use a 5/8 inch diameter pin. Measure the hole in your hitch and the thickness of the receiver to determine the needed usable length. Common lengths are 2.5 to 3 inches. Always check your coupler and receiver specifications before purchasing.
Are stainless steel locking pins worth the extra cost?
Yes, especially if you tow in saltwater or wet climates. Stainless steel resists rust far better than zinc-plated steel, extending the pin’s life and maintaining smooth operation. For occasional dry-weather towing, a quality zinc pin may be sufficient.
Can a locking pin be used with a hitch lock?
Yes, many users combine a locking pin with a hitch lock for added security. The locking pin secures the hitch ball or coupler, while a hitch lock prevents the receiver from being removed. Ensure both fit your hitch without interference.
How do I maintain my trailer hitch locking pin?
Periodically lubricate the lock cylinder with graphite powder or silicone spray. Clean the pin with a damp cloth to remove dirt and salt. For stainless steel pins, occasional polishing can maintain appearance. Avoid using oil-based lubricants that attract dust.
Are keyed-alike locking pins available?
Some brands offer keyed-alike options for multiple pins. This allows you to use one key for all your locking pins. Check product descriptions or contact the manufacturer. Most standard pins come with unique keys for each lock.
Our Verdict
After researching and comparing specifications, industry standards, and owner feedback, the Trimax UMAX100 earns our top pick for its exceptional corrosion resistance, reliable locking, and overall value. For those prioritizing maximum security, the B&W Trailer Hitches locking pin is an excellent runner-up with its patented theft-resistant design.
