Best Fifth Wheel King Pin Lock: Practical Features for Easier Everyday Use

A strong fifth wheel king pin lock prevents a trailer from being connected to an unauthorized tow vehicle and suits RV owners, semi-trailer operators, and anyone storing a fifth wheel unattended. The right choice depends less on appearance than on kingpin compatibility, body construction, lock design, and how easily you can install or remove it. This roundup compares 10 options ranging from lightweight aluminum and compact steel designs to heavy-duty locks using hardened steel, ductile iron, stainless steel, or cast iron.

Several include warning tags that remind you to remove the lock before hitching, while handle-based designs can make access easier beneath a trailer. Use the fit details first, then match security features and handling preferences to your trailer and storage routine.

The best fifth wheel king pin lock depends on your trailer’s kingpin dimensions and security needs. For easier handling, BOYISEN and Jayour include handles, while Trimax uses an easy push-button design and a full collar. For higher-security construction, Proven Industries uses a solid-steel TIG-welded collar with a stainless-steel pin, and AMPLock combines stainless steel with ductile cast iron.

RVMATE specifies a 50 mm pin fit, and The Equipment Lock Company is designed for a standard 2-inch kingpin. Warning tags on several models add a useful hitching reminder.

Fifth Wheel King Pin Locks Compared

Image	Product	Buy
Best Pick 1	BOYISEN 5th Wheel King Pin Lock, Solid Steel, Handle, Warning Tag, Black Best for: Solid steel construction Brand: BOYISEN | Color: Black	View on Amazon
Best Pick 2	TRIMAX TFW80HD 5th Wheel King Pin Lock, Red Best for: Bright red deterrent Brand: Trimax | Color: ‎Red	View on Amazon
Best Pick 3	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) Best for: Heavy duty powder coat Brand: THE EQUIPMENT LOCK COMPANY | Included Components: 2 keys	View on Amazon
Best Pick 4	Curt 23255 Dumbbell Style King Pin Lock Best for: Dumbbell style security Brand: CURT | Color: Black	View on Amazon
Best Pick 5	METOWARE 5th Wheel King Pin Lock for RVs & Semi Trailers, Black Best for: Universal RV/trailer fit Brand: METOWARE | Color: Black	View on Amazon

How We Compared These Products

We compared dimensions, capacity, materials, compatibility, included components, and care requirements across many Amazon listings. These details matter because the product must fit the available space, intended use, setup requirements, and maintenance routine. After examining the wider field, we selected 10 products from BOYISEN, Trimax, THE EQUIPMENT LOCK COMPANY, CURT, METOWARE, Jayour, RVMATE, BYERNAUTO, Proven Industries, and AMPLock.

The shortlist includes products such as BOYISEN 5th Wheel King Pin Lock, TRIMAX TFW80HD 5th Wheel King Pin Lock, and THE EQUIPMENT LOCK COMPANY Equipment Lock Heavy Duty 5th Wheel King Pin Lock. Every recommendation is tied to information stated for that specific product; unclear or missing features were treated as unknown rather than filled with assumptions.

Detailed Reviews: Best Fifth Wheel King Pin Lock

1. BOYISEN 5th Wheel King Pin Lock, Solid Steel, Handle, Warning Tag, Black

Best for: Convenient Handle Design.

This BOYISEN 5th Wheel King Pin Lock offers enhanced convenience with its unique outward-turning cylinder and integrated handle, simplifying the locking and unlocking process for your fifth wheel. It features a keyed-unique blossom lock system for added security.

Constructed from alloy steel, this 2-pound lock measures 3.27 x 3.27 x 3.27 inches, providing robust protection for RVs, container trailers, and campers. It includes three keys and a warning tag. The special cut-resistant feature adds an extra layer of theft deterrence, ensuring your trailer remains secure.

Product Details

Pros

• Convenient handle for easier operation
• Keyed-unique blossom lock system
• Includes 3 keys and a warning tag
• Cut-resistant alloy steel construction

Cons

• Limited manufacturer warranty of 30 days free return

Ideal for RV and trucking use, this lock offers a user-friendly design. Ensure it fits your specific kingpin dimensions for optimal security and peace of mind during travel.

2. TRIMAX TFW80HD 5th Wheel King Pin Lock, Red

Best for: Rugged Trailer Security.

The TRIMAX TFW80HD 5th Wheel King Pin Lock boasts a rugged, weatherproof epoxy powder coat and a full collar design to prevent grease transfer. Its easy push-button lock mechanism ensures quick and hassle-free use.

Built with ultra-tough hardened steel, this lock provides maximum security against tampering and harsh environments. The red epoxy powder coat offers superior rust and corrosion resistance, ensuring long-lasting durability. Measuring 8 x 3 x 4 inches and weighing 3.39 pounds, it's designed for reliable protection.

Product Details

Pros

• Rugged, weatherproof epoxy powder coat
• Full collar design prevents grease transfer
• Easy push-button locking mechanism
• Ultra-tough hardened steel construction

Cons

• Includes only 2 keys

Perfect for RV owners seeking durable, weather-resistant security. Its straightforward operation makes it a practical choice for regular use on fifth-wheel trailers.

3. 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)

Best for: Heavy-Duty RV Theft Prevention.

The Equipment Lock Heavy Duty 5th Wheel Kingpin Lock offers unmatched protection for your trailer with its high-security barrel lock system and full coverage of your 2-inch kingpin. This universal solution is designed for reliable trailer and RV theft prevention.

Constructed from durable alloy steel with a bright red powder coating, this lock is highly visible and built to deter thieves. It fully covers the kingpin, making it impossible for others to hitch. Designed to fit standard 2” kingpin and 5th wheel trailer pins, it provides dependable security for your trailer, RV, or camper.

Product Details

Pros

• High-security barrel lock system
• Fully covers 2" kingpin for maximum security
• Durable alloy steel with powder coating
• Universal fit for standard kingpins

Cons

• Keyed differently, meaning each lock has a unique key

An excellent choice for RV and trailer owners prioritizing robust anti-theft features. Its full kingpin coverage ensures it fits standard 2-inch pins effectively.

4. Curt 23255 Dumbbell Style King Pin Lock

Best for: Lightweight Trailer Security.

The CURT 23255 Dumbbell Style King Pin Lock features a strong aluminum body and a universal design to deter theft of most fifth-wheel trailers. Its reliable security is enhanced by a chrome-plated and powder-coated finish.

This lock is constructed from lightweight yet strong aluminum, weighing only 1.6 ounces, and measures 6 x 5.5 x 3 inches. It includes two keys for added convenience and is designed to be weather-resistant. The dumbbell style provides a unique and effective security solution for your fifth-wheel kingpin.

Product Details

Pros

• Strong aluminum body construction
• Universal design fits most kingpins
• Chrome-plated and powder-coated finish
• Lightweight at only 1.6 ounces

Cons

• Includes only two keys

Ideal for RV owners seeking a lightweight yet secure lock. Its universal fit makes it a versatile option, though it's best suited for standard fifth-wheel applications.

5. METOWARE 5th Wheel King Pin Lock for RVs & Semi Trailers, Black

Best for: Durable Trailer Protection.

The METOWARE 5th Wheel King Pin Lock is crafted from high-strength iron with a double layer of electrophoretic paint for superior durability and corrosion resistance. It includes an eye-catching warning label and a 12-inch chain to remind you to remove it before hitching.

This heavy-duty lock, weighing 1.11 kg and measuring 4.32 x 4.33 x 3.62 inches, is built from heavy-duty alloy steel for weather resistance and impact protection. Its solid, impact-resistant body offers no leverage points for bolt cutters, ensuring strong anti-theft capabilities for RVs and semi-trailers.

Product Details

Pros

• High-strength iron construction
• Double-layer electrophoretic paint coating
• Includes warning label and chain
• Impact-resistant body deters bolt cutters

Cons

• Offers a 30-day warranty service

A solid choice for RV and semi-trailer owners prioritizing robust construction and theft deterrence. Its weather-resistant features make it suitable for various climates.

6. 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

Best for: Tough Steel Security.

Engineered with top-quality durable steel, this Jayour Heavy-Duty King Pin Lock ensures your fifth-wheel trailer, RV, or camper is strong and unbreakable. It features a convenient handle and a bright yellow caution tag to deter potential thieves.

Constructed from tough alloy steel, this lock provides full security and peace of mind when parking your trailer. Weighing 1.9 kg, its heavy-duty design is built to prevent theft effectively. The included high-visibility yellow warning tag serves as an additional deterrent, making your trailer less of a target.

Product Details

Pros

• Tough, durable steel material
• Prevents theft effectively
• Convenient handle included
• Bright yellow caution tag deterrent

Cons

• Color is yellow, which may not match all trailer aesthetics

Recommended for RV and trailer owners seeking a robust and visually deterrent lock. Its heavy-duty steel construction offers reliable security against theft attempts.

7. RVMATE 5th Wheel Lock, Yellow, Heavy Duty Steel King Pin Lock

Best for: Visible Trailer Deterrent.

The RVMATE 5th Wheel Lock features heavy-duty steel construction and an eye-catching yellow color with a matching tag, serving as a strong warning and deterrent against theft. It's designed to prevent thieves from connecting to your fifth-wheel kingpin.

This lock, measuring 3 x 3 x 3.3 inches and weighing 1.08 kg, is made from alloy steel for durability and weather resistance. It offers a universal fit for 50 mm diameter trailer pins, making it widely applicable for securing fifth-wheel trailers, semi-trailers, and RVs, ensuring unauthorized movement is avoided.

Product Details

Pros

• Heavy-duty steel construction
• Eye-catching yellow lock and tag
• Prevents unauthorized connection
• Universal fit for 50mm pins

Cons

• Internal diameter is 74mm, check compatibility

Suitable for RV and semi-trailer owners who prefer a highly visible deterrent. Its universal fit for 50mm pins makes it a versatile security option.

8. 5th Wheel King Pin Lock for RVs, Semi Trailers & Camper

Best for: Robust Steel Security.

The BYERNAUTO 5th Wheel King Pin Lock provides effective security with its heavy-duty precision mechanism, deterring thieves from connecting to your fifth-wheel kingpin. Made from heavy-duty steel copper, its welded construction is weather and rust resistant.

This lock, measuring 4.41 x 3.27 x 3.27 inches, is crafted from alloy steel for strength and longevity. It includes a warning tag and two keys, offering perfect protection for your trailer. The weather-resistant body ensures it remains strong and long-lasting, suitable for RVs, semi-trailers, and containers.

Product Details

Pros

• Heavy-duty steel copper construction
• Weather and rust resistant body
• Includes warning tag and 2 keys
• Deters unauthorized movement effectively

Cons

• Black color may be less visible than brighter options

A reliable choice for RV and semi-trailer owners seeking durable, weather-resistant security. Its industrial style and heavy-duty build offer strong protection against theft.

9. Proven Industries PL-5 Kingpin Lock – Fifth-Wheel Coupler Security

Best for: Industrial Strength Security.

Proven Industries PL-5 Kingpin Lock features a solid-steel TIG-welded collar secured by a 303 stainless-steel pin, offering industrial-strength protection against power tools and bolt cutters. This tough lock is designed for heavy-duty fifth wheels, keeping your trailer secure.

Constructed from hardened stainless steel, this lock is built to withstand burglars using power tools, hammers, and crowbars. Weighing 4 pounds, its robust design ensures maximum security for 18-wheelers and campers. It is specifically designed for industrial and heavy-duty fifth wheels, providing premium security solutions.

Product Details

Pros

• Solid-steel TIG-welded collar
• 303 stainless-steel pin
• Resistant to power tools and bolt cutters
• Hardened stainless steel construction

Cons

• Weighs 4 pounds, making it heavier than some alternatives

Ideal for owners of industrial and heavy-duty fifth wheels prioritizing maximum security. Its robust construction is best suited for those facing higher theft risks.

10. King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

Best for: Ultimate Trailer Protection.

The AMPLock U-LPCVR King Pin Lock is built to secure fifth-wheel trailers, semi-trailers, and commercial haulers with its robust conical anti-traction pin design. This heavy-duty lock offers ultimate protection and deters unauthorized access.

Constructed from a combination of cast iron and stainless steel, this lock is weatherproof and rust-resistant, ensuring maximum protection in tough conditions. Measuring 7 x 6 x 8.5 inches, its anti-corrosion features make it durable for long-term use. It includes a set of two keys and a tag with key information.

Product Details

Pros

• Robust conical anti-traction pin design
• Cast iron and stainless steel construction
• Weatherproof and rust-resistant
• Anti-corrosion features for durability

Cons

• Gray color may not be as visible as brighter options

A top choice for professionals and trailer owners seeking ultimate security and durability. Its robust build is ideal for commercial haulers and RVs in harsh environments.

What Buyers Often Overlook

Fit and compatibility: verify the kingpin before ordering

Fit should be confirmed from the lock’s stated dimensions or compatibility details, not assumed from the phrase universal. The Equipment Lock Company states that its lock fits a standard 2-inch kingpin, while RVMATE lists a 50 mm diameter trailer-pin fit, an internal diameter of 74 mm, and an 83 mm height. CURT describes its dumbbell-style lock as universal for most fifth wheel kingpins, but its listing does not provide a specific pin measurement.

Other products in this roundup list body dimensions without confirming a universal fit, so those measurements should not be treated as proof of compatibility. Compare your trailer’s kingpin size and the clearance around it with the manufacturer’s stated fit information.

A warning tag, handle, or coating cannot compensate for a lock that does not seat correctly.

The Key Product Trade-Off

Materials and security trade-offs for exposed storage

Material and construction indicate different priorities, but the listings do not establish a universal ranking. CURT uses an aluminum body, making it notably lighter by its listed weight than the steel-focused options, while BOYISEN, RVMATE, Jayour, and BYERNAUTO specify alloy or heavy-duty steel construction. Trimax uses hardened steel and adds a full collar, weatherproof epoxy powder coating, and a limited lifetime warranty.

Proven Industries specifies a solid-steel TIG-welded collar with a 303 stainless-steel pin and describes resistance to power tools and bolt cutters. AMPLock combines cast iron and stainless steel in a conical design and highlights anti-corrosion features.

METOWARE uses ductile iron with electrophoretic paint and a warning tag. Choose based on the balance you need between lighter handling, substantial construction, corrosion resistance, and the level of security detail provided.

Best Fifth Wheel King Pin Lock: Buyer's Guide

Fit, Dimensions, and Compatibility

Compare the listed dimensions with the intended counter, cabinet, appliance, storage, or installation space. Confirm model compatibility and connection requirements where they are supplied. A useful feature cannot compensate for a product that does not physically fit or work with the buyer’s existing setup.

Capacity, Output, and Operating Format

Match listed capacity, volume, output, and operating mode to the actual household or work routine. Larger figures can support heavier use, while a smaller format may be easier to place and maintain. Treat daily output, immediate storage, and container capacity as separate specifications when the listing distinguishes them.

Materials, Construction, and Care

Use the listed materials and care instructions to judge cleaning effort, storage conditions, and compatibility with the intended use. Dishwasher, freezer, food-contact, or weather-related claims are included only when supplied for that product. Check whether routine care fits the way the product will be used.

Included Components and Setup Needs

Review the included components before planning installation or first use. Hoses, adapters, lids, paddles, bowls, brushes, controls, and manuals vary by listing. Confirm power, water, assembly, or accessory requirements from the supplied product information rather than assuming that separately pictured parts are included.

Which Should You Choose?

Choose BOYISEN or Jayour if a handle matters when reaching under the trailer; both list convenient handle features, and BOYISEN includes three keys. Choose Trimax if a full collar, push-button locking, hardened steel, and weather-resistant epoxy coating fit your routine. Choose The Equipment Lock Company or RVMATE when the stated 2-inch or 50 mm compatibility matches your kingpin.

Choose CURT when a lightweight aluminum body and a universal design for most kingpins are priorities. For a heavier security-focused design, consider Proven Industries or AMPLock.

METOWARE and BYERNAUTO suit buyers who value visible warning tags, while BYERNAUTO also lists a two-year manufacturer warranty. Check dimensions and included keys or tags before ordering.

Quick Buying Checklist

• Confirm the complete dimensions against the available space.
• Verify model, accessory, connection, and appliance compatibility.
• Match capacity or output to the expected amount of use.
• Compare materials and care instructions with the maintenance routine.
• Check the included components before planning setup or first use.
• Confirm listed power, water, storage, or installation requirements where applicable.

Frequently Asked Questions

How do I install a fifth wheel king pin lock?

Installation typically involves inserting the lock into the kingpin assembly and securing it with the provided key. Ensure the lock is fully engaged and cannot be removed without the key. Always refer to the specific product’s instructions for the most accurate installation process.

What makes a king pin lock effective against theft?

Effective locks are constructed from hardened steel or similar robust materials, making them difficult to cut or break. Features like bright colors or warning tags can also act as visual deterrents, signaling that the trailer is secured and potentially discouraging opportunistic theft.

Are king pin locks universal for all fifth wheels?

Most king pin locks are designed to fit standard fifth wheel kingpin dimensions. However, it’s crucial to check the product specifications to ensure compatibility with your specific RV or trailer model. Some locks may offer a more universal fit than others.

How do I choose the right material for a king pin lock?

Consider locks made from solid steel, stainless steel, or ductile cast iron for maximum durability and resistance to tampering. These materials offer superior strength against cutting or prying attempts, providing better long-term security for your fifth wheel.

Can a king pin lock be used in all weather conditions?

Yes, most heavy-duty king pin locks are designed to withstand various weather conditions. Look for powder-coated or stainless steel options that resist rust and corrosion. Regular cleaning and lubrication can help maintain their functionality over time.

Final Words

Selecting the right fifth wheel king pin lock is crucial for protecting your investment. Prioritize robust materials like solid steel or stainless steel for maximum security. Consider features like bright deterrents and ease of use.

Ultimately, the best lock is one that fits your kingpin securely and provides peace of mind against theft.