We researched and compared the best heavy duty trailer hitch locks available on Amazon, evaluating manufacturer specifications, industry standards, and aggregated owner feedback. Our analysis focuses on security, durability, and ease of use for tow trucks and heavy trailers. Below are our top picks with honest assessments of their strengths and weaknesses.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Master Lock 389DAT Top Pick 5/8 inch diameter hardened boron steel shackle, dual locking levers |
9.0 | 🛒 Check Price |
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Trimax TML100 Runner Up 1/2 inch hardened steel shackle, double ball bearing locking mechanism |
8.7 | 🛒 Check Price |
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Reese Towpower 7007800 Best Value 5/8 inch hardened steel pin, weather-resistant cylinder |
8.4 | 🛒 Check Price |
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BOLT Lock 7505 Best Disc Lock Disc lock design, hardened steel body, 5/8 inch shackle |
8.1 | 🛒 Check Price |
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Pro Series 5/8 Hitch Lock Best Chrome 5/8 inch chrome-plated steel pin, double-locking mechanism |
7.8 | 🛒 Check Price |
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Curt Manufacturing 23560 Best Keyless Combination lock, 5/8 inch hardened steel pin |
7.5 | 🛒 Check Price |
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Husky 1/2 Hitch Lock Budget Pick 1/2 inch hardened steel pin, weather-resistant cover |
7.2 | 🛒 Check Price |
1. Master Lock 389DAT: Top Pick
The Master Lock 389DAT is our top pick for heavy duty trailer hitch locks. We found its 5/8 inch hardened boron steel shackle offers superior cut resistance, and the dual locking levers effectively prevent prying attacks. Owner feedback consistently praises its durability, even in harsh conditions. Based on the spec sheet, the weather-resistant cover adds longevity, though some users note the key can be stiff initially.
However, this lock is heavier than many alternatives, which may be a concern for those wanting minimal added weight. If you need a lighter lock or one with a combination dial, consider other options. But for maximum security on a tow truck, this is our top recommendation.
- Hardened boron steel shackle resists cutting and sawing
- Dual locking levers for added security against prying
- Weather-resistant cover protects lock mechanism
Pros: Exceptional cut resistance; Smooth operation in all weather; Trusted brand with good warranty
Cons: Heavier than some competitors; Key can be difficult to turn when new
2. Trimax TML100: Runner Up
The Trimax TML100 is a strong runner up. We compared its double ball bearing locking mechanism, which provides excellent pick resistance, and the hardened steel shackle offers solid cut resistance. Owner feedback highlights its smooth operation and ease of use. The vinyl coating helps prevent scratches, but some owners report peeling after extended use.
If you need the absolute thickest shackle, this may not be your first choice. However, for most tow truck applications, the TML100 offers a great balance of security and convenience. It is a reliable lock that we recommend for those who prioritize ease of use.
- Double ball bearing locking mechanism resists picking and prying
- Hardened steel shackle with protective vinyl coating
- Fits most standard trailer hitches
Pros: Smooth key operation; Compact and lightweight design; Good corrosion resistance
Cons: Shackle smaller than some heavy duty options; Vinyl coating can peel over time
3. Reese Towpower 7007800: Best Value
The Reese Towpower 7007800 offers solid security at a reasonable price point. We researched its hardened steel pin and weather-resistant cylinder, which provide good protection against cutting and corrosion. Owner feedback indicates it fits well and is easy to install. However, some users note the key can stick in freezing temperatures.
If you are on a budget but still want a heavy duty lock, this is a good choice. However, those needing maximum pick resistance should look at higher-end models. For most tow truck owners, it provides adequate security without breaking the bank.
- Hardened steel pin resists cutting
- Weather-resistant cylinder prevents rust
- Includes two keys
Pros: Affordable for the security level; Simple design easy to use; Fits standard 5/8 inch hitch holes
Cons: Not as pick-resistant as premium locks; Key may stick in cold weather
4. BOLT Lock 7505: Best Disc Lock
The BOLT Lock 7505 is a disc lock that offers excellent prying resistance. We evaluated its hardened steel construction and unique key code system, which adds an extra layer of security. Owner feedback praises its durability and compact size. However, the shorter shackle may not fit all hitch receivers, and it can be tricky to install in tight spaces.
If your hitch has ample clearance, this lock is a great option. But for larger hitches or those needing a longer shackle, consider alternatives. It is best suited for those who want a compact, high-security lock.
- Disc lock design resists prying and bolt cutters
- Hardened steel body and shackle
- Keyed to unique code for security
Pros: Unique key code prevents key duplication; Compact and easy to carry; Good corrosion resistance
Cons: Shackle shorter than some hitches require; Can be difficult to insert in tight spaces
5. Pro Series 5/8 Hitch Lock: Best Chrome
The Pro Series 5/8 Hitch Lock features a chrome-plated steel pin and double-locking mechanism. We found the chrome finish provides decent corrosion resistance, and the double lock adds an extra layer of security. Owner feedback mentions smooth operation and good fit. However, the chrome can chip with heavy use, and the steel is not as hard as boron steel.
If aesthetics matter to you, this lock looks great. But for maximum cut resistance, choose a boron steel option. It is a solid choice for light to medium duty use, but heavy duty applications may require a stronger material.
- Chrome-plated finish resists rust and looks good
- Double-locking mechanism adds security
- Fits standard 5/8 inch hitch receivers
Pros: Attractive chrome finish; Smooth key operation; Good value for the price
Cons: Chrome can chip over time; Not as cut-resistant as boron steel
6. Curt Manufacturing 23560: Best Keyless
The Curt Manufacturing 23560 is a keyless combination lock that offers convenience. We researched its hardened steel pin and combination mechanism, which provides adequate security for many users. Owner feedback highlights its ease of use and the benefit of not needing keys. However, the combination can be vulnerable to guessing if not set carefully, and it is generally less secure than keyed locks.
If you frequently share your trailer or hate carrying keys, this is a good option. But for maximum security, we recommend a keyed lock. It is best for low-risk environments where convenience is paramount.
- Keyless combination lock for convenience
- Hardened steel pin resists cutting
- Easy to set and reset combination
Pros: No keys to lose; Simple to use; Good for shared use
Cons: Combination can be guessed if not set well; Less secure than keyed locks
7. Husky 1/2 Hitch Lock: Budget Pick
The Husky 1/2 Hitch Lock is our budget pick. We evaluated its hardened steel pin and weather-resistant cover, which provide basic security. Owner feedback indicates it works well for light duty applications. However, the 1/2 inch pin is smaller than heavy duty standards, making it more vulnerable to cutting, and the cover can degrade over time.
If you need a lock for occasional use or a low-security situation, this is a cost-effective choice. But for heavy duty towing or high-theft areas, invest in a thicker lock. It is best suited for temporary or low-value trailers.
- Hardened steel pin for cut resistance
- Weather-resistant cover protects lock
- Affordable price point
Pros: Very affordable; Simple and effective; Lightweight
Cons: Smaller pin size reduces security; Cover may not last long
Frequently Asked Questions
What size hitch lock do I need for a tow truck?
Most tow trucks use a 2.5 inch or 3 inch receiver, requiring a lock with a 5/8 inch diameter pin. Always measure your hitch receiver’s hole diameter before purchasing. Some heavy duty locks offer adjustable sleeves to fit different receiver sizes.
Are disc locks better than standard pin locks?
Disc locks offer higher resistance to prying and bolt cutters due to their design, but they may not fit all hitch receivers. Standard pin locks are more versatile and easier to use. For heavy duty security, a high-quality pin lock with a hardened shackle is often sufficient.
How do I prevent my hitch lock from rusting?
Choose locks with weather-resistant coatings like chrome, vinyl, or stainless steel. Regularly lubricate the lock mechanism with graphite or silicone spray. Store the lock in a dry place when not in use to extend its life.
Can I use a hitch lock on a 5th wheel trailer?
No, hitch locks are designed for bumper pull trailers with a receiver hitch. For 5th wheel trailers, use a king pin lock specifically designed for that application. Using the wrong lock can compromise safety.
What is the most secure type of hitch lock?
Based on our research, locks with a hardened boron steel shackle and double locking mechanism offer the best security. Brands like Master Lock and Trimax are highly rated. Avoid combination locks for maximum security as they are more susceptible to guessing.
Our Verdict
After researching and comparing specifications and owner feedback, our top pick is the Master Lock 389DAT for its exceptional cut resistance and dual locking levers. The Trimax TML100 is a close runner up, offering smooth operation and solid security. Both are excellent choices for heavy duty trailer hitch locks.
