Puck locks earn their name from the disc-shaped “hockey puck” design that hides the shackle, which is the U-shaped metal loop that swings open on a regular padlock. Without an exposed loop, bolt cutters have nothing to grab, so thieves move on to easier targets. Trailers, work vans, and gooseneck hitches all benefit from this style, since parked equipment is a magnet for quick theft attempts. The list below covers the categories that matter most: heavy-duty gooseneck couplers, sliding collar couplers, standalone puck padlocks for general use, and vehicle-specific kits for full-size vans.
A Closer Look At The Lineup
Reese Goosebox Lock
Master Lock M736XKAD Chrome Puck
PACLOCK 9-Series Cone Puck (Black)
PACLOCK 9-Series Cone Puck (Stainless)
Bulldog Sliding Collar Lock w/Puck
Gooseneck Set Bolt Lock w/Trimax
Slick Locks Ford Transit Puck Kit
Slick Locks Chevy Express Kit (1997+)
Slick Locks Ram ProMaster Kit (2014+)
More On The Choices That Made The List
This lock wraps the entire coupler head of a Reese Goose Box, which is the pivoting pin box used to connect a gooseneck trailer to a truck bed. The welded steel shroud fully encloses the latch, so a thief cannot pry at the moving parts without first defeating the bracket itself. Owners at storage yards appreciate that the design demands power tools or a cutting torch to remove.
Unlike a standalone puck padlock such as the Master Lock M736XKAD later on this list, this unit is a vehicle-specific shroud rather than a general-purpose disc lock. It accepts most puck-style locks sold separately, which lets you upgrade the core cylinder over time without buying a new bracket.
Features That Help
- Welded steel construction that resists pry attacks and absorbs the shock of jacking attempts.
- Full enclosure of the coupler head leaves no exposed latch lever to manipulate.
- Compatibility with separate puck locks means you can swap the cylinder for keyed-alike convenience later.
- Bolts directly to the Goose Box geometry, so install tools are basic hand tools only.
Points To Keep In Mind
- Puck lock core is sold separately, raising the total spend beyond a one-piece option.
- Brackets are specific to Reese Goose Box couplers and will not fit other gooseneck brands.
Key Specs
Right Fit For
Reese Goose Box owners who tow regularly and want a dedicated bracket that fully shrouds the coupler head.
Swap It Out When
You run a different gooseneck brand and need a more universal puck-style padlock like the Master Lock M736XKAD instead.
When a trailer-specific bracket feels like overkill, a standalone hidden-shackle padlock handles sheds, storage units, and gate chains with the same bolt-cutter resistance. The M736XKAD is part of the Magnum line, which targets commercial jobsites and freight trucks. Chrome plating keeps the body corrosion-resistant in coastal and rainy climates.
Compared with the Reese Goosebox Lock above, this pick is a generalist rather than a dedicated coupler shroud. You drop it into any hasp, latch, or chain link that fits a puck profile, and the hidden shackle stays out of reach of standard bolt cutters.
Practical Pluses
- Hidden shackle removes the cut point that defeats traditional padlocks.
- Chrome plated body shrugs off rain, road salt, and humidity longer than bare steel.
- Fits hasps and latch holes designed for puck-style locks, including many trailer doors.
Points To Note
- No trailer-specific bracket, so it relies on whatever hasp you mount it to.
- Keyed function only, with no combination or electronic backup option.
Built With In Mind
Storage unit renters and small business owners securing gate chains or shed doors in shared lots.
A Better Fit Elsewhere
You tow a gooseneck trailer and need a bracket-built option like the Reese Goosebox Lock instead.
PACLOCK’s 9-Series is a high-security puck built around a patented cone-shaped front face. That cone disrupts a drill bit’s angle, which makes frontal drilling attacks much harder than on a flat-faced puck. The “SR” stands for Standard Rekeyable, meaning a locksmith can re-pin the cylinder to match your facility’s master key system.
Where the Master Lock M736XKAD above handles everyday storage duty, the PACLOCK steps into facility-grade roles: utility substations, gated yards, and gated service rooms. Owners commonly pick the keyed-alike option so a single key opens multiple locks across a site.
What Helps Most
- Cone front deflects drill bits, slowing the most common puck-defeat method.
- Rekeyable cylinder lets you re-pin the lock to match existing master-key systems.
- Keyed-alike option reduces key clutter across multi-lock sites.
- Black powder finish hides scuffs on jobsite installations.
Honest Caveats
- Heavier body may not fit shallow recessed housings designed for thinner pucks.
- Specialty tool required for rekeying, so plan a locksmith visit if you change keys.
Feature Snapshot
Whose Shelf It Belongs On
Facility managers running a multi-lock perimeter who want one key to cover every door.
Where Another Pick Suits Better
You work in a wet, salty environment where the stainless PACLOCK 9-Series Cone Puck is the smarter spend.
Take the cone-face concept from the black PACLOCK above and machine it from 304 stainless steel, and you get a lock that shrugs off marine air, road chemicals, and winter salt. The 304 grade is a common stainless alloy known for corrosion resistance in outdoor environments. That material choice matters anywhere the lock sits exposed for months at a time.
For coastal contractors, marina operators, or northern climates with road salt slush, the stainless body outlasts plated steel without needing a spray-can touch-up each fall. The keyed-different option suits single-door installations where a master key is unnecessary.
What Stands Out
- 304 stainless body resists rust far longer than plated steel in salt-air environments.
- Cone front design continues to frustrate frontal drill attacks.
- Standard rekeyable cylinder accepts aftermarket pin kits for future key changes.
Possible Compromises
- Stainless build typically costs more than powder-coated equivalents.
- Keyed-different configuration means each lock needs its own key unless you rekey later.
Key Attributes
Best Suited To
Marinas, coastal yards, and northern fleet operators who routinely face salt corrosion.
Reach For A Different Pick When
You want one key across an entire facility, in which case the keyed-alike PACLOCK 9-Series Cone Puck (Black) is the better match.
This lock targets a specific trailer hardware style: the Bulldog sliding collar coupler, where a movable collar grips the hitch ball. The bracket wraps the collar entirely, so the collar cannot slide open or release the ball while the puck lock holds the assembly together. Welded hinges and hinge pins make crowbar prying difficult.
The bright yellow powder coat is more than cosmetic. On a crowded jobsite or storage yard, the visible yellow warns anyone scanning for an easy target that the trailer is hardened. That alone tends to redirect attention to softer pickups nearby.
Standout Benefits
- Welded steel bracket stops the sliding collar from moving, which is the core security of the coupler.
- Bolt cutter and crowbar resistant build with no thin stamped parts to flex.
- Hi-vis yellow finish doubles as a visual theft deterrent on crowded lots.
- Includes a Cobra SideWinder puck lock for one-stop shopping.
Worth Bearing In Mind
- Bracket fits only the Bulldog sliding collar coupler shape and not generic couplers.
- Bulkier than a standalone puck, so it adds weight at the trailer tongue.
Who It Suits Best
Trailer owners running Bulldog sliding collar couplers who want a tamper-evident hardened setup.
Not Your Match When
You tow a gooseneck trailer, since the Gooseneck Set Bolt Lock covers a different locking point entirely.
Where the Reese Goosebox Lock earlier on the list guards the coupler head itself, this unit locks the set bolt that holds the drop tube inside the truck bed. The set bolt is the fastener that anchors the gooseneck ball mount to the frame. If a thief can remove the ball, they can hook up and drive away. The bracket denies access to that bolt.
Paired with a Trimax hidden-shackle puck, the lock stays out of bolt-cutter reach. The 3/16-inch welded cold rolled steel adds heft that hand tools struggle to overpower.
Well-Handled Touches
- Targets the set bolt, which is the actual fastening point thieves need to remove.
- Welded cold rolled steel resists hammer, chisel, and crowbar approaches.
- Includes a Trimax puck so the core lock and bracket ship together.
Smaller Caveats
- Only fits specific gooseneck drop tubes, so verify your bed crossmember pattern before ordering.
- Adding the puck to a bracket raises the all-in price above a basic puck padlock.
Spec Overview
Made For
Gooseneck tow truck owners who leave trailers attached in shared farm yards or contractor lots.
Consider Something Else When
You run a Reese Goose Box trailer, where the Reese Goosebox Lock is the dedicated solution.
Cargo vans full of tools are prime theft targets, and factory door latches on a Ford Transit are not exactly secret. Slick Locks designs a vehicle-specific bracket kit that mounts puck locks over the sliding side door and the rear cargo doors, so the same key secures both access points. Installation uses factory holes, which means no new drilling into the body panels.
Compared with the trailer couplers reviewed earlier, the daily-use case is different. You are locking and unlocking multiple times per day at jobsite stops, and a single keyed-alike key streamlines the routine.
Positive Points
- Keyed-alike design means one key handles both the sliding and rear doors.
- No-drill install preserves the van body and resale value.
- Custom brackets matched to factory mounting points for a clean, factory-looking fit.
Details To Watch
- Vehicle-specific, so it fits Ford Transit full-size vans only and not other brands.
- Lock cylinders sit exposed to road grime, so occasional cleaning keeps the keyway smooth.
Perfect Match For
Tradespeople and delivery drivers who leave tools in a Transit overnight and want quick keyed access during the workday.
Look Elsewhere When
You drive a Chevy Express instead, in which case the Slick Locks Chevy Express Kit covers your doors.
The Chevy Express has been on roads since 1997, and a lot of work vans out there are well past their first decade. This Slick Locks kit covers the side and rear hinged doors on compatible models, adding puck-style locks that engage the factory latch geometry. Like the Ford Transit kit, the brackets mount through existing holes rather than requiring new cuts into the sheet metal.
For HVAC, plumbing, or electrical contractors who run Express vans, this kit adds a real deterrent without modifying the body. The keyed-alike setup keeps the keychain simple across a fleet.
Positive Takeaways
- Vehicle-specific fit for 1997+ Chevy Express vans with hinged cargo doors.
- No-drill install through factory latch-bolt locations.
- Keyed-alike lock points across both doors streamline daily entry.
Factors To Consider
- Long production run means trim levels and door configs vary, so confirm door type before ordering.
- Adds visible hardware that some owners consider bulky against the original door lines.
Who Should Grab It
Service business owners running older Chevy Express vans for tool storage and job-site runs.
Where A Sibling Pick Shines
Your fleet leans Ram ProMaster, where the Slick Locks Ram ProMaster Kit matches the door geometry instead.
Ram ProMaster vans are a favorite for delivery upfits, camper conversions, and mobile workshops. Slick Locks builds a kit for the sliding passenger door and the rear split doors, using puck-style cylinders that open from one key. The brackets mount through existing latch-bolt points, so the install keeps the factory sheet metal intact.
Unlike the trailer-focused locks earlier in the list, this kit is a vehicle-security upgrade you install once and use daily. For most fleets, depending on how the doors get used, having one key across both lock points is a small but real workflow win.
What Makes Sense
- Custom brackets matched to the ProMaster’s sliding and rear split door latch geometry.
- No-drill mounting through factory bolt locations preserves body integrity.
- Single key operates both lock points for faster stops during a busy route.
Potential Sticking Points
- Fits 2014+ ProMaster models only, so older Sprinters or Transits need different kits.
- Lock cylinders benefit from occasional lubrication, especially in dusty work environments.
Built With In Mind
Contractors and delivery operators who rely on a Ram ProMaster for daily routes and want added cargo security.
Skip It When
You run a Ford Transit fleet, where the Slick Locks Ford Transit Puck Kit is the proper fit.
What Matters Most Before Choosing Puck Locks
Trailer Style Comes First
The single biggest decision is whether you are securing a coupler, a drop-tube set bolt, or a van door. Reese Goosebox Lock, Bulldog Sliding Collar Lock, and Gooseneck Set Bolt Lock each solve a different fastening point. Buy the wrong bracket and it physically will not fit, so match the lock to the hardware you already have.
Body Material And Climate
Plated steel and chrome handle mild climates fine, but salt air and road chemical slush punish cheaper finishes. In wet or coastal regions, the PACLOCK 9-Series Cone Puck in stainless is the safer pick. Inland and dry climates can save with the powder-coated black version.
Keying Strategy
A single lock on one shed works with any keying, but a fleet of vans or a row of perimeter gates demands keyed-alike cylinders so one key handles everything. PACLOCK’s keyed-alike option and Slick Locks vehicle kits both address that daily-use scenario.
Daily Use Versus Long-Term Storage
Puck padlocks on vans get handled dozens of times per day, so smooth key action and corrosion resistance matter. Trailer couplers that sit untouched for weeks can prioritize raw strength over key feel. Own the routine before you buy.
Common Slip Ups And Upgrade Value
Mistakes Worth Dodging
The most common buying error is grabbing a universal puck padlock and assuming it fits a specific coupler. Reese Goose Box, Bulldog collar, and gooseneck set bolt all have distinct geometries, and a generic puck just drops inside the existing hasp. The bracket locks below exist for a reason, and the wrong fit leaves a critical fastener exposed.
Where The Extra Money Goes
Higher-tier puck locks spend your money on three places: a frontal-attack resistant body, weather-grade material, and a rekeyable cylinder. The PACLOCK 9-Series stainless version gains all three. You pay for the cone face, the 304 stainless body, and the rekey pins. For a single home shed, the Master Lock M736XKAD already covers the threat model. For a marina gate or utility substation, the stainless upgrade pays for itself in lockout calls and replacement cost.
Frequently Asked Questions
What Is A Puck Lock?
A puck lock is a padlock with a disc-shaped body and a hidden shackle. The shackle is concealed inside the housing, so bolt cutters cannot reach it.
Are Puck Locks Harder To Pick Than Regular Padlocks?
Most puck locks use a 5-pin or higher cylinder that resists picking better than basic pin tumbler padlocks, though any mechanical lock can be picked given enough time and skill.
Can A Puck Lock Fit Any Trailer Coupler?
No. Puck padlocks fit hasps and latch points designed for that disc profile, but specific couplers like the Reese Goose Box need a dedicated bracket. Match the lock to the hardware.
Do Puck Locks Rust In Winter?
Plated steel pucks can corrode under road salt exposure. Stainless steel pucks, such as the PACLOCK 9-Series stainless version, hold up much longer in winter conditions.
Are Van Door Lock Kits Hard To Install?
Vehicle-specific kits from Slick Locks use factory mounting points and basic hand tools, so most owners complete the install in under an hour per door.
