A combination hitch pin lock secures a receiver-mounted ball mount or accessory without requiring a key. The Trimax is best for buyers who want a covered, weather-resistant lock, while the Synrroe and SKLRNAU options offer a longer 3.5-inch usable span for compatible receivers. Tallew is best for shoppers who need two locks. Compare pin diameter and usable length with your receiver before ordering; a 5/8-inch pin does not guarantee a fit.
| Product | Best For | Key Fit Detail |
|---|---|---|
| Trimax Combination Receiver Lock | Weather protection | 5/8-inch pin; 3-1/4-inch span |
| Synrroe Keyless Hitch Lock | Longer receiver span | 5/8-inch pin; 3.5-inch usable length |
| SKLRNAU Keyless Receiver Lock | Listed receiver compatibility | Check vehicle exclusions |
| Tallew Two-Pack | Two-lock value | 5/8-inch pin; 2.75-inch usable length |
| SKLRNAU 5/8-Inch Pin Lock | Another long-span option | Check vehicle exclusions |
Trimax Combination Receiver Lock
The Trimax has a 5/8-inch pin and a listed 3-1/4-inch span. It is designed for Class III, IV, and V hitches, making it an option for buyers who need a combination lock for a range of receiver classes. Its protective lock-head cover is intended to shield the mechanism from dirt, moisture, and debris. The product listing also describes its materials as non-corrosive and rust-proof.
Best for: Owners who prioritize a covered lock mechanism and need a 5/8-inch receiver pin. It was selected for its stated weather-protection features and broad class compatibility. Limitation: The listed span is shorter than the 3.5-inch options below, so measure your setup before choosing it.
Synrroe Long-Span Combination Hitch Lock
This Synrroe lock uses a 5/8-inch pin and offers a 3.5-inch usable length. Its listing describes compatibility with 2-inch and 2.5-inch receivers, including Class III, IV, and V applications. The four-digit resettable combination provides 10,000 code options. The product is made from powder-coated steel, and the listing states a 30,000-pound gross trailer weight rating.
Best for: Buyers whose receiver needs more pin length than a shorter lock provides and who want keyless access. Limitation: Receiver size alone does not confirm fit; check the usable span and receiver wall thickness before ordering. The stated towing rating is a product specification, not a substitute for checking the ratings of the complete towing setup.
SKLRNAU Keyless Receiver Lock
This SKLRNAU model has a 5/8-inch pin, 3.5-inch usable shaft length, and resettable four-digit code with 10,000 combinations. The listing describes powder-coated steel construction and a 30,000-pound rating. It is intended for standard thin-wall 2-inch and regular 2.5-inch receivers.
Best for: Buyers who have verified that their receiver matches the listed dimensions and want a long-span combination lock. Limitation: The seller specifically excludes several vehicles and receiver styles, including 2026–2026 Toyota Tacoma models, specified heavy-duty Ford, Ram, Chevrolet, and GMC trucks, and 3-inch Class V receivers. Confirm the exact exclusions in the listing before purchase.
Tallew Two-Pack Hitch Pin Locks
This set includes two 5/8-inch combination receiver locks. Each has a listed 2.75-inch usable length and a four-digit code with 10,000 possible combinations. The listing describes heavy-duty steel construction and a 30,000-pound gross trailer weight rating. It says the locks fit compatible 2-inch and 2.5-inch receivers and Class III and IV hitches.
Best for: Buyers who want two locks for separate towing setups or accessories, or who need to share keyless access with another user. Limitation: Its usable length is shorter than the 3.5-inch models, and the listing’s receiver-fit language does not replace checking your specific receiver dimensions.
SKLRNAU 5/8-Inch Combination Pin Lock
This separate SKLRNAU listing describes a 5/8-inch pin with a 3.5-inch usable shaft, a resettable four-digit combination, and a stated 30,000-pound rating. Its compatibility guidance is for standard thin-wall 2-inch and regular 2.5-inch receivers. Those dimensions make it a possible alternative for shoppers comparing long-span keyless pins.
Best for: Buyers who are comparing listings for the same general style of long-span combination lock. Limitation: The listing repeats major exclusions found on the other SKLRNAU model, including specified newer Tacoma and heavy-duty truck receivers. This is a separate product listing with similar stated specifications, not a confirmed improvement over the other option.
Buying Guide: How To Choose A Combination Hitch Pin Lock
Does the pin diameter match your receiver?
Check the receiver and hitch accessory specifications before ordering. The products here use 5/8-inch pins, but that diameter alone does not establish compatibility. Also confirm receiver class, wall thickness, usable pin length, and the position of the pin holes.
How much usable length do you need?
Compare the lock’s usable span with the assembled receiver and accessory. The listed choices range from 2.75 to 3.5 inches. A longer span may be necessary for some setups, but extra length does not ensure a secure fit. Choose a pin that passes through the aligned holes and locks as intended.
Is a combination lock right for your routine?
A resettable combination avoids carrying a key and can simplify access for multiple users. Keep the code somewhere secure and follow the product’s instructions for setting or changing it. A lock’s combination feature does not prevent every form of theft, so consider the value of the equipment and where it is parked.
What do ratings and weather features mean?
Use a stated gross trailer weight rating as one specification to compare, not as the rating of your entire towing system. Follow the limits of the vehicle, receiver, hitch, and trailer. If the lock will be exposed to road debris or moisture, a protective cover or corrosion-resistant materials may be useful; the Trimax listing specifically describes those features.
Frequently Asked Questions
What is a combination hitch pin lock used for?
It replaces a standard receiver hitch pin and locks the hitch accessory in place using a combination rather than a key.
Are all 5/8-inch hitch pin locks interchangeable?
No. Pin diameter is only one fit requirement. Receiver size, wall thickness, pin-hole alignment, and usable length also matter.
Can a 3.5-inch lock fit every 2.5-inch receiver?
No. The SKLRNAU listing warns that certain thick-wall and vehicle-specific receivers are incompatible. Check the manufacturer’s exclusions and dimensions.
Is a combination lock more secure than a keyed lock?
The product details provided do not establish that one locking style is more secure. A combination lock offers keyless access, but buyers should compare construction, fit, and security needs.
Can I use a hitch pin lock to tow more weight?
No. A lock does not increase towing capacity. Stay within the limits of every component in the towing setup.