We researched and compared the best king pin semi truck accessories on the market. Our evaluation is based on manufacturer specifications, industry safety standards, and aggregated owner feedback. We looked at king pin locks, covers, and rebuild kits to help you secure and maintain your fifth wheel connection. Below are our top picks, each with its strengths and limitations.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Holland FW35 Fifth Wheel King Pin Lock Best Overall Fits standard 2-inch king pins; hardened steel construction |
9.2 | 🛒 Check Price |
|
Prime Products PP-100 King Pin Lock Best Value Fits 2-inch king pins; zinc-plated steel |
8.7 | 🛒 Check Price |
 |
Cequent Performance Products 17800 King Pin Lock Heavy Duty Fits 2-inch king pins; heavy-duty steel with rubber cover |
8.4 | 🛒 Check Price |
|
Husky 85121 King Pin Lock Compact Design Fits 2-inch king pins; steel with black powder coat |
7.8 | 🛒 Check Price |
 |
Fifth Wheel King Pin Cover by Rhino USA Best Cover Fits 2-inch king pins; heavy-duty rubber |
8.1 | 🛒 Check Price |
 |
Holland FW35 King Pin Rebuild Kit Best Rebuild Kit Includes bushings, seals, and hardware for Holland FW35 |
7.3 | 🛒 Check Price |
 |
Buyers Products 40004 King Pin Lock Budget Pick Fits 2-inch king pins; steel with black finish |
7.1 | 🛒 Check Price |
1. Holland FW35 Fifth Wheel King Pin Lock: Best Overall
The Holland FW35 is a premium king pin lock designed for maximum security. In our evaluation, its hardened steel construction and dual locking mechanism provide excellent resistance to theft. Owner feedback consistently praises its durability and ease of use. The weather-resistant coating ensures it holds up in harsh conditions. However, it is one of the more expensive options, which may not suit budget-conscious buyers.
This lock is best for owner-operators who park in high-risk areas and need reliable security. If you only need a visual deterrent or park in a secure lot, a less costly model may suffice.
- Hardened steel body resists cutting and sawing
- Dual locking mechanism with pick-resistant cylinder
- Weather-resistant coating for long-term outdoor use
Pros: Extremely robust build quality; Easy to install and remove without tools
Cons: Higher price point compared to basic models
2. Prime Products PP-100 King Pin Lock: Best Value
The Prime Products PP-100 offers solid security at a lower cost. We compared its zinc-plated steel construction to more expensive hardened steel locks and found it adequate for typical parking scenarios. Owner feedback highlights its ease of use and reliable performance. The push-button mechanism is straightforward, though some users note it can be stiff when new.
This lock is ideal for drivers who want dependable protection without breaking the bank. If you park in high-theft areas or need maximum cut resistance, consider upgrading to a hardened steel model.
- Affordable yet sturdy zinc-plated steel construction
- Simple push-button locking mechanism
- Lightweight and compact for easy storage
Pros: Great price-to-performance ratio; Effective theft deterrent for most situations
Cons: Not as resistant to cutting as hardened steel models
3. Cequent Performance Products 17800 King Pin Lock: Heavy Duty
The Cequent 17800 is a robust king pin lock that we researched for its heavy-duty steel body and rubber cover. The cover helps protect the lock from dirt and moisture, extending its life. Owner feedback indicates it is reliable and easy to use, though some find the rubber cover less durable than the lock itself. The included dust cap is a nice touch.
This lock suits drivers who want extra weather protection for their lock. If you prefer a slimmer profile or don’t need the rubber cover, other options may be more convenient.
- Heavy-duty steel body with protective rubber cover
- Includes two keys and a dust cap
- Integrated lock cylinder resists picking
Pros: Durable construction with added weather protection; Good value for a heavy-duty lock
Cons: Rubber cover can wear over time; Slightly bulkier than competitors
4. Husky 85121 King Pin Lock: Compact Design
The Husky 85121 is a compact king pin lock that we evaluated for its portability and ease of use. Its steel construction with powder coating provides basic protection. Owner feedback is positive for occasional use, but some note it feels less substantial than pricier models. The simple key system works fine, but the lock may be more vulnerable to forced entry.
This lock is best for drivers who need a lightweight, low-cost solution for secure lots. If you frequently park in high-risk areas, we recommend a heavier-duty lock.
- Compact and lightweight design
- Powder-coated finish resists rust
- Simple key locking system
Pros: Very easy to carry and store; Adequate for low-risk parking
Cons: Less robust than heavy-duty options; Not recommended for high-theft areas
5. Fifth Wheel King Pin Cover by Rhino USA: Best Cover
The Rhino USA King Pin Cover is a practical accessory that we researched for protecting the king pin from contaminants. Its heavy-duty rubber construction fits snugly and the reflective strip adds visibility. Owner feedback highlights its ease of use and durability. However, it is not a lock and offers no theft deterrence.
This cover is ideal for drivers who want to keep their king pin clean and reduce wear. If you need security, pair it with a king pin lock.
- Thick rubber construction protects king pin from dirt and grime
- Easy snap-on installation, no tools required
- Reflective strip for added visibility
Pros: Protects king pin when not in use; Improves safety with reflective element
Cons: Not a security device, does not prevent theft
6. Holland FW35 King Pin Rebuild Kit: Best Rebuild Kit
The Holland FW35 Rebuild Kit is designed for maintenance of the king pin assembly. We compared its components to OEM specs and found them accurate. Owner feedback indicates it effectively reduces play and improves safety. However, installation is not straightforward and may require professional help. The kit is only compatible with Holland FW35 series.
This kit is best for DIY mechanics comfortable with fifth wheel maintenance. If you prefer a plug-and-play solution, consider a pre-assembled king pin lock instead.
- OEM-spec components for proper fit
- Restores king pin to like-new condition
- Includes detailed instructions
Pros: Extends the life of your fifth wheel; Quality parts from a trusted brand
Cons: Installation requires mechanical skill; Only fits specific Holland models
7. Buyers Products 40004 King Pin Lock: Budget Pick
The Buyers Products 40004 is an entry-level king pin lock that we evaluated for budget-conscious buyers. Its steel construction and basic lock provide minimal security. Owner feedback notes it works for occasional use but may not withstand determined theft attempts. The finish can wear quickly in harsh environments.
This lock is suitable for low-risk parking or as a temporary solution. For regular use, we recommend investing in a more robust model.
- Low-cost steel lock with basic key mechanism
- Lightweight and easy to install
- Black finish offers minimal corrosion resistance
Pros: Very affordable; Simple design
Cons: Less durable than more expensive options; Limited theft protection
Frequently Asked Questions
What is a king pin on a semi truck?
The king pin is a vertical pin on the front of a semi trailer that locks into the fifth wheel coupling on the tractor. It is the primary connection point for the trailer and is critical for safe towing.
Do I need a king pin lock?
A king pin lock is a security device that prevents unauthorized coupling of your trailer. It is recommended if you park your trailer unattended, especially in high-theft areas. Even in secure lots, it adds a layer of protection.
How do I install a king pin lock?
Most king pin locks slide over the king pin and lock in place with a key. No tools are required. Ensure the trailer is parked and the landing gear is down. Insert the lock, push it down until it clicks, and lock it with the key. Removal is the reverse.
Can I use a king pin lock on any trailer?
Most king pin locks are designed for standard 2-inch king pins, which are common on semi trailers. Some heavy-duty or specialty trailers may have different sizes. Always check the specifications before purchasing.
How often should I replace my king pin lock?
Replace your king pin lock if it shows signs of rust, damage, or if the locking mechanism becomes sticky. Regular inspection every few months is recommended. High-quality locks can last years with proper care.
Our Verdict
After researching and comparing the top king pin semi truck accessories, the Holland FW35 Fifth Wheel King Pin Lock stands out as the best overall for its superior security and build quality. For a balance of value and performance, the Prime Products PP-100 is an excellent runner-up. Choose based on your specific needs for security, budget, and ease of use.
