Best Fifth Wheel King Pin Lock for RVs and Trailers

#1 · Best Overall

1. BOYISEN King Pin Lock

• Material: heavy duty alloy steel
• Weight: 2.2 lb
• Warranty Description: 30 Days free return and lifetime warranty

Best for: Handle-forward access.

Why it ranks #1: Designed for standard-sized kingpins, it combines heavy-duty alloy steel, a convenient handle, three keys, and a high-visibility warning tag.

An outward-facing cylinder and added handle give the BOYISEN lock a more accessible locking and unlocking motion than a downward-facing cylinder. Its heavy-duty alloy-steel body and included warning tag suit owners who want a visible kingpin deterrent, while three keys provide spares for keeping access available.

The handle and outward-facing cylinder make the lock easier to reach during installation and removal, particularly when working around the fifth-wheel pin. BOYISEN specifies a fit for standard-sized kingpins, so buyers can use that stated fit as a starting point when checking their trailer. The blossom lock and heavy-duty alloy-steel construction provide the stated security features, while the yellow finish and included warning tag make the lock more conspicuous when the trailer is parked.

Skip it if you need a stated full-coverage barrel system; THE EQUIPMENT LOCK COMPANY's HD Keyed Differently model specifies full 2-inch kingpin coverage.

Choose this for a standard-sized fifth-wheel pin when reaching the lock comfortably and keeping spare keys matter. Its stated fit is standard-sized, so buyers with unusual pin dimensions should verify compatibility before relying on it.

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

#2 · Best Warranty

2. Trimax TFW80HD

• Material: Hardened Steel, Red
• Weight: 3.39 lb
• Warranty Description: Limited Lifetime Warranty

Best for: Quick push-button locking.

Why it ranks #2: Hardened steel, a full collar, push-button locking, and a limited lifetime warranty make this a well-specified option for frequent use.

A push-button locking mechanism lets the Trimax TFW80HD lock quickly without a more involved locking routine. Its full-collar design also helps prevent grease from transferring to hands, while hardened steel and a red epoxy powder coat address durability and corrosion resistance for owners who park their fifth wheel outdoors.

The push-button mechanism supports quick locking, and the full collar keeps hands away from grease around the kingpin during handling. Trimax pairs hardened steel with a weatherproof epoxy powder coat, which the listing says resists rust and corrosion in harsh environments. Together, those features suit owners seeking straightforward use and protective finishing. Two keys are included, and the listed dimensions are 8 by 3 by 4 inches, useful details when planning handling and storage.

Skip it if you want an outward-facing cylinder and handle; BOYISEN model 190905 specifies both for easier lock access.

Choose the TFW80HD if quick push-button operation, a grease-shielding collar, and a corrosion-resistant finish fit your parking routine. Its stated dimensions and full-collar format are worth considering for storage and handling.

Listed on Amazon as: TRIMAX TFW80HD 5th Wheel King Pin Lock, Red

#3 · Best Heavy-Duty Build

3. Proven Industries PL-5

• Material: Stainless Steel
• Weight: 4 lb

Best for: Heavy-duty coupler protection.

Why it ranks #3: Its solid-steel TIG-welded collar and 303 stainless-steel pin target industrial and heavy-duty fifth-wheel couplers.

A solid-steel TIG-welded collar secured by a 303 stainless-steel pin gives the Proven Industries PL-5 a substantial coupler-locking structure. It is specified for industrial and heavy-duty fifth wheels, making it a focused option for owners of campers or 18-wheelers seeking a robust lock for a compatible coupler.

The TIG-welded collar and stainless-steel retaining pin work together to secure the coupler, while the listing describes hardened-steel construction as helping resist attacks with power tools, hammers, and crowbars. Proven Industries specifically recommends the PL-5 for industrial and heavy-duty fifth wheels, so buyers should treat that use case as a fit boundary rather than assume it suits every kingpin. At four pounds, its weight also matters when planning handling and storage.

Skip it if you need a lightweight lock for frequent handling; CURT 23255 lists a 1.6-ounce aluminum-body design.

The PL-5 suits owners of industrial or heavy-duty fifth wheels who prioritize a welded collar and hardened-steel construction. Its four-pound weight and stated heavy-duty application make handling and coupler compatibility important considerations.

Listed on Amazon as: Proven Industries PL-5 Kingpin Lock – Fifth-Wheel Coupler Security

#4 · Best Corrosion-Resistant Design

4. AMPLock LPCVR

• Material: Cast Iron, Stainless Steel

Best for: Commercial-hauler security.

Why it ranks #4: The conical lock design uses cast iron and stainless steel, and its listed special feature is anti-corrosion protection.

A conical anti-traction pin defines AMPLock's LPCVR, giving this heavy-duty lock a security-focused design for fifth-wheel trailers, semi-trailers, and commercial haulers. Its cast-iron and stainless-steel construction is paired with a rust- and corrosion-resistant design, making it a candidate for owners securing equipment in varied weather.

The conical anti-traction pin is the central design feature for restricting unauthorized access to the fifth-wheel connection, while the cast-iron and stainless-steel materials provide the listed heavy-duty construction. AMPLock describes the lock as weatherproof and rust- and corrosion-resistant, supporting use in outdoor conditions. The set includes two keys and a tag with key information, which can help keep the keys identifiable when the lock is used across commercial or recreational equipment.

Skip it if you want a push-button lock with a stated full collar; Trimax TFW80HD lists those features for quick use and grease separation.

This fits buyers securing fifth-wheel RVs, semi-trailers, or commercial haulers who value a conical pin design and corrosion resistance. Its 7-by-6-by-8.5-inch dimensions are worth factoring into storage plans.

Listed on Amazon as: King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

#5

5. Equipment Lock King Pin Lock

• Material: Alloy Steel

Best for: Full-coverage security.

Why it ranks #5: This alloy-steel lock is specified for standard 2-inch kingpins and features full kingpin coverage, a high-security barrel lock, and two keys.

Full coverage of a 2-inch kingpin is the defining feature of THE EQUIPMENT LOCK COMPANY's heavy-duty lock, helping prevent others from hitching to the trailer. A high-security barrel lock system and alloy-steel construction make it a fit for RV owners prioritizing pin coverage and a keyed security mechanism.

The stated full coverage of the 2-inch kingpin blocks access to the pin, while the high-security barrel lock system supplies the locking mechanism. Its alloy-steel construction and bright red powder-coated finish combine a heavy-duty material with a conspicuous exterior, which can help make the lock noticeable on a parked trailer. The listing specifies a standard 2-inch kingpin fit, making that dimension the key compatibility check before choosing this model.

Skip it if you want a push-button mechanism and a stated full collar; Trimax TFW80HD offers both alongside hardened steel.

A sensible match for owners of fifth-wheel RVs or campers with a standard 2-inch kingpin who prioritize full pin coverage. Check that pin dimension first; the listing does not establish fit for other sizes.

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)

#6

6. Jayour Heavy-Duty Lock

• Material: Alloy Steel
• Weight: 1.9 kg

Best for: Visible parked-trailer deterrent.

Why it ranks #6: The alloy-steel lock includes a handle and bright yellow warning tag, with a listed weight of 1.9 kilograms.

A bright yellow caution tag gives the Jayour king pin lock a visible deterrent when the trailer is parked. The heavy alloy-steel lock also has a handle for convenient handling, making it a practical option for RV and trailer owners who want a prominent reminder and a straightforward way to grip the lock.

The handle provides a grasping point when positioning or removing the heavy-duty steel lock, while the yellow caution tag makes its presence more apparent around a parked fifth wheel. Jayour lists alloy steel as the material and recommends the lock for security on trailers, RVs, and similar vehicles. At 1.9 kilograms, its substantial listed weight is relevant for anyone who regularly moves the lock between storage and the kingpin.

Skip it if you prefer a lighter aluminum-body option; CURT 23255 lists an aluminum construction and weighs 1.6 ounces.

This suits owners who value a handle and conspicuous warning tag while securing a parked trailer or RV. Consider its 1.9-kilogram weight if you will frequently carry it between storage and the kingpin.

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

#7

7. BYERNAUTO King Pin Lock

• Material: Alloy Steel
• Warranty Description: 2 Year Manufacturer

Best for: Weather-resistant steel construction.

Why it ranks #7: Its alloy-steel construction, weather-resistant body, warning tag, two keys, and stated two-year manufacturer warranty support everyday trailer use.

Welded heavy-duty steel construction gives the BYERNAUTO king pin lock a solid body for securing fifth wheels, semi-trailers, and RVs. Its weather- and rust-resistant finish addresses outdoor parking, while the included warning tag adds a visible reminder that the kingpin is locked.

The welded steel construction and precision locking mechanism are presented as the core security features, intended to deter unauthorized movement of a trailer. A weather- and rust-resistant body suits outdoor storage, while the warning tag makes the locked status more visible to people around the vehicle. BYERNAUTO includes two keys and lists the lock for fifth wheels, semi-trailers, RVs, and containers, offering several stated use cases for one lock.

Skip it if you need a stated 2-inch fit and full pin coverage; THE EQUIPMENT LOCK COMPANY's HD Keyed Differently model specifies both.

Choose this for a trailer, RV, semi-trailer, or container when weather resistance and a visible warning tag suit your storage setup. Check your kingpin dimensions, since the supplied listing does not specify a size.

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

#8

8. METOWARE King Pin Lock

• Material: Heavy Duty Alloy Steel
• Weight: 1.11 kg
• Warranty Description: 30 DAYS WARRANTY SERVICE

Best for: Reminder-tag setup.

Why it ranks #8: This heavy-duty alloy-steel model has a double electrophoretic coating and includes a 12-inch chain with a bright red warning tag.

A 12-inch chain and bright red warning label are the METOWARE lock's practical distinction: the label is intended to remind users to remove the lock before hitching. Its high-strength iron body and double-layer electrophoretic paint offer a weather-resistant approach for RV and semi-trailer owners who want that reminder attached.

The chain lets the warning label remain attached to the lock, keeping the remove-before-hitching reminder with the security device rather than separate from it. METOWARE lists a high-strength iron body and double-layer electrophoretic paint, features associated in the supplied description with durability, weather resistance, and corrosion protection. The black lock is listed for securing fifth wheels, and the warning message is in English, a relevant detail for buyers choosing a visible operating reminder.

Skip it if you need a stated handle and outward-facing cylinder; BOYISEN model 190905 lists both for easier access during locking.

Consider this if keeping a remove-before-hitching reminder attached to the lock is useful in your parking routine. The label is in English, and the supplied fit information identifies fifth-wheel use rather than pin dimensions.

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

#9

9. WAR-LOK TKP-10

• Material: Alloy Steel

Best for: Untethered-trailer security.

Why it ranks #9: It is identified as a heavy-duty alloy-steel anti-theft lock for securing untethered trailers, but the supplied listing gives few further details.

WAR-LOK identifies the TKP-10 for securing untethered trailers, making that parked-trailer use case its clearest fit. Its alloy-steel construction and heavy-duty, anti-theft features provide the listed basis for deterring theft when the trailer is left unattended, without relying on unlisted mechanisms or fit claims.

The alloy-steel material and heavy-duty designation establish the TKP-10's stated construction, while its anti-theft feature aligns with the listed purpose of securing untethered trailers and protecting cargo from theft. That use-case information helps narrow selection for owners parking a trailer away from a towing vehicle. The supplied specifications do not identify a pin-size range, so compatibility should be assessed against the particular fifth-wheel setup before purchase.

Skip it if you need a stated standard 2-inch fit and full kingpin coverage; THE EQUIPMENT LOCK COMPANY's HD Keyed Differently model specifies both.

This is aimed at owners securing an untethered trailer and cargo against theft. Its alloy-steel, heavy-duty description is clear, but the supplied specifications do not establish kingpin dimensions or a universal fit.

Listed on Amazon as: WAR-LOK TKP-10 5th Wheel King Pin Lock, Anti-Theft Trailer, Heavy Duty Steel

#10

10. CURT 23255 King Pin Lock

• Material: Aluminum
• Weight: 1.6 oz
• Warranty Description: Limited Lifetime MFG Warranty (1Yr Finish 1Yr…

Best for: Lightweight aluminum body.

Why it ranks #10: Its dumbbell-style aluminum design fits most fifth-wheel kingpins, but it offers less listed construction detail than the steel-focused alternatives.

At a listed 1.6 ounces, the CURT 23255 is notably light to carry and store between uses. Its dumbbell-style aluminum body locks onto a fifth-wheel kingpin, and the universal design is specified to fit most fifth-wheel trailer kingpins, suiting owners who want a compact, broad-fit option.

The aluminum body keeps the listed weight low, making the lock easier to handle and stow than a heavier steel construction may be. CURT says the universal design fits most fifth-wheel trailer kingpins, giving buyers a broad stated fit while still leaving room for individual pin differences. A chrome-plated and powder-coated finish adds the listed weather-resistant protection, and two included keys provide a spare for access management.

Skip it if you prioritize a hardened-steel body and full collar; Trimax TFW80HD specifies both features for its fifth-wheel lock.

This is a practical choice for buyers seeking a lightweight lock with a stated fit for most fifth-wheel kingpins. Because the fit is described as most, not all, compare your pin before selecting it.

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