Best 5Th Wheel Hitch Lock: Compare 10 Kingpin and Rail Locks

#1 · Best Overall

1. BOYISEN King Pin Lock

• Material Type: Alloy Steel
• Weight: 2 lb
• Material: Alloy Steel

Best for: Frequent Under-Trailer Locking.

Why it ranks #1: Alloy steel, a handle, outward-facing cylinder, three keys, and a warning tag make it a practical, well-equipped kingpin-lock choice.

An outward-facing cylinder and added handle make the BOYISEN easier to operate beneath a fifth wheel, where downward-facing locks can be awkward to reach. Its alloy-steel body, uniquely keyed blossom-style lock, and included warning tag suit owners seeking a visible kingpin barrier with a distinctive key setup.

The handle gives you a dedicated grip while the outward-facing cylinder changes the approach for locking and unlocking under the trailer. BOYISEN says each lock is keyed uniquely, so its three included keys operate this lock rather than a shared set across different owners. Alloy steel forms the lock body, and the warning tag adds a visible reminder at the kingpin. This is a kingpin lock, not a base-rail lock.

Skip it if you manage several locks with one key; the BOYISEN keyed-alike model is intended for that shared-key workflow.

Choose this for a fifth-wheel owner who wants a handle and outward-facing cylinder for under-trailer access, plus a warning tag. Its unique keying suits individual locks, not fleets needing one key for several BOYISEN locks.

Listed on Amazon as: BOYISEN 5th Wheel King Pin Lock, Solid Steel, Handle, Warning Tag, Black

#2 · Full Coverage

2. Equipment Lock Heavy Duty

• Material Type: Alloy Steel
• Material: Alloy Steel

Best for: Standard Two-Inch Kingpins.

Why it ranks #2: Its high-security barrel system fully covers a standard 2-inch kingpin; alloy steel, a red powder-coated finish, and two keys add useful details.

Full coverage of a standard 2-inch kingpin is the defining feature of this Equipment Lock Company model, blocking hitch connection while making the lock a visible security step for an RV or trailer. Its alloy-steel construction and high-security barrel lock system focus the setup on kingpin protection.

The lock fully covers a standard 2-inch kingpin, which prevents another hitch from connecting while the trailer is parked. Its high-security barrel lock system provides the locking mechanism, while alloy steel supplies the stated body material. A bright red powder-coated finish makes the device conspicuous on the kingpin. The package includes two keys, giving the owner a spare for the same lock; the specified fit is standard 2-inch pins.

Skip it if you need a lock specified for another pin size; the RVMATE RMKPL lists a 50 mm pin fit.

This suits RV and trailer owners securing a standard 2-inch kingpin who value full coverage and a visible red finish. Keep the stated pin-size boundary in mind; this model is not specified for other kingpin diameters.

Listed on Amazon as: Equipment Lock Heavy Duty 5th Wheel King Pin Lock – Powder Coated Steel 5th Wheel Hitch Lock – Anti-Theft Tow Hitch Lock – Secure Fifth Wheel Lock for Theft Prevention & Security (Keyed Differently)

#3 · Keyed-Alike Pick

3. BOYISEN Keyed Alike Lock

• Material Type: heavy duty alloy steel
• Weight: 2 lb
• Material: heavy duty alloy steel

Best for: Shared-Key Fleet Management.

Why it ranks #3: This alloy-steel kingpin lock has a handle, warning tag, and three keys, with keyed-alike operation suited to managing multiple BOYISEN locks.

Keyed-alike operation lets one key manage multiple BOYISEN kingpin locks, making this yellow model suited to RV sites, trucking operations, or trailer fleets. Its handle and outward-facing cylinder also ease locking and unlocking beneath the trailer, while a warning tag adds a visible reminder.

The keyed-alike setup is the central workflow benefit: a manager can use one key across different BOYISEN locks instead of carrying a separate key for each. The added handle and outward-facing cylinder support access under the trailer when securing or removing the lock. Heavy-duty alloy steel forms the body, and the yellow keyed-alike finish and warning tag make the device more noticeable. Three keys are included, with the shared-key feature specifically described for BOYISEN locks.

Skip it if you want a uniquely keyed lock for individual ownership; the BOYISEN KPL B0C2PJXPK8 uses unique keying.

This is a practical choice for fleet, campsite, or trailer-management operators handling multiple BOYISEN kingpin locks. Its shared-key convenience applies to BOYISEN locks, so account for that brand boundary when organizing a mixed fleet.

Listed on Amazon as: BOYISEN 5th Wheel King Pin Lock Keyed Alike, Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag (Keyed Alike Yellow)

#4 · Warning-Tag Set

4. METOWARE King Pin Lock

• Material Type: Heavy Duty Alloy Steel
• Weight: 1.11 kg
• Material: Heavy Duty Alloy Steel

Best for: Visible Reminder And Chain.

Why it ranks #4: Heavy-duty alloy steel, a 12-inch chain, and a bright red warning tag provide a visible reminder and practical anti-forgetfulness feature.

A 12-inch chain carrying a bright red warning tag makes the METOWARE lock hard to overlook before hitching, helping remind users to remove it first. Its heavy-duty alloy-steel construction and double-layer electrophoretic paint give owners a weather-conscious kingpin lock with a clear visual cue.

The attached 12-inch chain lets the red warning tag hang away from the lock, making the reminder visible during pre-hitch checks. METOWARE describes the body as high-strength iron and the specification lists heavy-duty alloy steel; its double-layer electrophoretic paint is intended to resist corrosion. The product also cites a solid, impact-resistant body without leverage points for bolt cutters. Together, those features address visibility and environmental exposure, though the included-components list names only the lock.

Skip it if you want a lock package explicitly listing keys; the BYERNAUTO BNA-L-01 includes two keys and a warning tag.

Consider this for RV or semi-trailer owners who value a chained red warning reminder and painted steel construction. Its stated package contents name the lock only, so it is less explicit about included accessories than some alternatives.

Listed on Amazon as: METOWARE 5th Wheel King Pin Lock for RVs & Semi Trailers, Black

#5

5. BYERNAUTO King Pin Lock

• Material Type: Alloy Steel
• Material: Alloy Steel

Best for: Weather-Exposed Trailer Parking.

Why it ranks #5: This alloy-steel lock includes a warning tag and two keys, and its listed two-year manufacturer warranty distinguishes it from several alternatives.

A welded heavy-duty steel body with weather- and rust-resistant construction gives the BYERNAUTO kingpin lock a practical focus for trailers parked outdoors. The included warning tag adds a reminder before hitching, while two keys support access to the lock for RV, camper, or semi-trailer owners.

The alloy-steel lock uses a welded construction finish, and its stated weather and rust resistance suits parking conditions where the lock remains exposed. The warning tag provides a visible prompt to remove the lock before hitching, reducing the chance of overlooking it during departure checks. Two included keys support access by the owner or a second user. It is specified for fifth wheels, semi-trailers, RVs, and containers, with dimensions of 4.41 by 3.27 by 3.27 inches.

Skip it if you need to secure the hitch at its base rails; the CURT 23256 is made for industry-standard rails.

A fit for RV and semi-trailer owners who park outdoors and want a warning tag alongside a weather-resistant steel kingpin lock. Choose it for kingpin security, not for locking the hitch base rails.

Listed on Amazon as: 5th Wheel King Pin Lock for RVs, Semi Trailers & Camper

#6 · Specified Pin Fit

6. RVMATE King Pin Lock

• Material Type: Alloy Steel
• Weight: 1.08 kg
• Material: Alloy Steel

Best for: Specified 50-Millimeter Pin Fit.

Why it ranks #6: Its 74 mm internal diameter and stated fit for 50 mm trailer pins give buyers concrete dimensions to compare before selecting this steel lock.

A stated internal diameter of 74 mm and fit for 50 mm trailer pins give the RVMATE kingpin lock a more specific compatibility profile than a general universal claim. Its yellow steel body and matching warning tag create a visible deterrent for fifth-wheel, RV, semi-trailer, and container use.

RVMATE lists a 50 mm diameter pin fit and a 74 mm internal diameter, helping buyers compare the lock with their trailer’s pin dimensions before use. The alloy-steel body is described as durable, and its yellow color with an eye-catching tag makes the secured kingpin more noticeable during a walkaround. The listed height is 83 mm. This combination prioritizes visible kingpin security, with the stated dimensions defining the fit rather than a broad universal claim.

Skip it if you need a lock specified for standard 2-inch pins; The Equipment Lock Company KPL lists standard 2-inch kingpins.

Consider this for owners whose trailer uses a 50 mm pin and who want a yellow, visible steel lock. Use its stated dimensions as the fit boundary rather than assuming it suits other kingpin diameters.

Listed on Amazon as: RVMATE 5th Wheel Lock, Yellow, Heavy Duty Steel King Pin Lock

#7

7. Jayour Heavy-Duty Lock

• Material Type: Alloy Steel
• Weight: 1.9 kg
• Material: Alloy Steel

Best for: Handle And High-Visibility Tag.

Why it ranks #7: The alloy-steel kingpin lock includes a convenient handle and bright yellow caution tag, though the listing gives fewer fit and key details.

A convenient handle paired with a bright yellow caution tag gives the Jayour lock two practical touches for parking and departure routines. Its tough alloy-steel construction targets fifth-wheel kingpin security, while the included tag can make the locked trailer more noticeable to people approaching it.

The handle provides a grip when fitting or removing the heavy-duty kingpin lock, a useful aid when working around the trailer’s coupling area. Jayour lists alloy steel as the material and describes the body as tough steel. The yellow warning tag supplies a visible deterrent and reminder, supporting a check before hitching. The listing includes the high-visibility tag and names RVs, trailers, and campers among its intended uses; it does not specify a key count in the supplied details.

Skip it if you need a stated spare-key count before choosing; the CURT 23255 explicitly includes two keys.

This suits RV and camper owners who value a handle and yellow visual reminder with a steel kingpin lock. The supplied details do not state the key count, so it is less clear for buyers planning shared access.

Listed on Amazon as: Heavy-Duty – King Pin Lock | Strong Tough Steel | Fifth Wheel Trailer Lock | Anti-Theft for RVs, Trailers, etc | with Bright Caution Tag Deterrent and Air Freshener

#8

8. CURT 23255 King Pin Lock

• Material Type: Aluminum
• Weight: 1.6 oz
• Material: Aluminum

Best for: Lightweight Aluminum Kingpin Lock.

Why it ranks #8: This dumbbell-style kingpin lock uses a strong aluminum body, fits most kingpins by its universal-design claim, and includes two keys.

At a listed 1.6 ounces, the CURT 23255 aluminum dumbbell-style lock offers a notably light option for securing a fifth-wheel kingpin. Its universal design fits most fifth-wheel trailer kingpins, while a chrome-plated and powder-coated finish provides weather resistance for owners wanting a compact lock with two included keys.

The aluminum body keeps the listed weight low, which can make handling and stowing the lock simpler than carrying a heavier steel device. CURT says its universal design fits most fifth-wheel trailer kingpins, so it can suit owners with common pin setups without specifying a single pin diameter. The chrome-plated and powder-coated finish is described as weather resistant. Two keys are included; the lock attaches to the kingpin to deter trailer theft.

Skip it if you specifically want a steel-bodied kingpin lock; the Jayour 90107 is listed as alloy steel.

Choose this for an owner prioritizing low listed weight and broad stated compatibility with most fifth-wheel kingpins. Its aluminum construction is the key trade-off, and the universal-fit claim does not specify every pin configuration.

Listed on Amazon as: Curt 23255 Dumbbell Style King Pin Lock

#9

9. Equipment Lock Kingpin Lock

• Material Type: Alloy Steel
• Material: Alloy Steel

Best for: Red Barrel-Lock Security.

Why it ranks #9: A red, powder-coated alloy-steel kingpin lock with a barrel-lock system and two keys, but its listed features offer less distinction than higher-ranked options.

A high-security barrel lock system covers the 2-inch kingpin on this Equipment Lock Company model, preventing another hitch from connecting while the trailer is secured. Its alloy-steel construction and red powder-coated finish pair a physical barrier with high visibility for fifth-wheel owners.

The lock covers a 2-inch kingpin, so a parked fifth wheel cannot be connected in the usual way while the device is engaged. Its high-security barrel lock system controls access, and the alloy-steel body provides the stated construction material. A red powder-coated finish is easy to spot during a walkaround, while two included keys support access by the owner and a second user. The product is specified as a kingpin lock rather than a base-rail device.

Skip it if you have a 50 mm pin and prefer a lock listing that dimension; the RVMATE RMKPL specifies a 50 mm fit.

Choose this for an owner securing a 2-inch fifth-wheel kingpin who wants a red, visible lock and barrel mechanism. Its stated pin size is the key fit boundary; it is not described as a rail lock.

Listed on Amazon as: Equipment Lock 5th Wheel Trailer Kingpin Lock – Powder Coated Steel 5th Wheel Hitch Lock – Anti-Theft Tow Hitch Lock – Durable, Secure Fifth Wheel Lock for Theft Prevention and Trailer Security

#10

10. CURT 23256 Rail Lock

• Weight: 1.96 lb

Best for: Industry-Standard Base Rails.

Why it ranks #10: This is a hitch base-rail lock, not a trailer kingpin lock; its 1/2-inch pin and industry-standard rail fit suit a different security point.

A 1/2-inch pin and stated fit across industry-standard rails make the CURT 23256 a base-rail hitch lock rather than a kingpin lock. Its high-strength steel pin and aluminum body secure the fifth-wheel hitch, while a 1/8-turn activation keeps locking and unlocking straightforward.

The extra-long 1/2-inch pin is specified to fit industry-standard base rails, giving this lock a different attachment point from kingpin models. It installs tight against the rails for a streamlined fit, and the 1/8-turn activation simplifies locking and unlocking when removing or securing the hitch. A high-strength steel pin pairs with an aluminum body. This is intended to protect the fifth-wheel hitch while unattended, not to cover the trailer’s kingpin.

Skip it if you need a lock that covers the trailer’s kingpin; the CURT 23255 is a kingpin lock.

Choose this for fifth-wheel owners securing a compatible hitch at industry-standard base rails, especially when quick 1/8-turn operation matters. Its defining boundary is attachment point: it locks the hitch rails, not the trailer kingpin.

Listed on Amazon as: CURT 23256 5th Wheel Base Rail Lock, 1/2-Inch Pin Diameter, Fits All Industry-Standard Rails,Black & Chrome