THE EQUIPMENT LOCK COMPANY Heavy-Duty Cargo Door Lock — Red Powder-Coated Combination, Fits 9-3/4"–16"

The Equipment Lock Company Heavy Duty Cargo Door Lock is a powder-coated steel, keyless four-digit combination lock that secures semi-trailer and shipping container vertical door bars spaced 9-3/4" to 16".

Designed for fleets, haulers, and jobsite storage, this heavy-duty cargo door lock fastens the innermost vertical locking bars of semi-trailers and sea containers to deter opportunistic theft. Constructed from thick steel with a powder-coated red finish and a tamper-resistant tubular pin tumbler mechanism, it delivers high-visibility deterrence and rugged resistance without requiring permanent mounting. The built-in four-digit combination allows multiple users to access the load without circulating keys.

How does this lock fit different trailer and container doors?

Installation is tool-free and adjustable: the lock separates into two halves that slide together around opposing vertical locking rods. It accommodates locking bar spacing from 9 3/4" up to 16"; an extension kit is available for wider gaps. Because it clamps onto existing rods, no welding or drilling is required.

• Fits vertical locking bars spaced 9 3/4"–16"
• Two-piece design slides together around rods—no mounting required
• Optional extension kit for wider bar spacing (sold separately)
• Adjusts tight for a snug, wobble-resistant fit

What security features protect my cargo?

The lock uses a heavy-gauge steel body and a tubular pin tumbler-style locking mechanism to resist common tampering methods. The powder-coated finish adds corrosion resistance for outdoor use while the bright red color increases visibility as a theft deterrent. Its clamping action ties both door bars together, preventing the doors from being opened even if external handles are tampered with.

• Thick steel construction withstands heavy force
• Tubular pin tumbler design reduces picking vulnerability
• Powder-coated finish for rust resistance and visibility
• Locks inner bars together to stop door opening

How do I use and set the four-digit combination?

No keys are needed—users set a custom four-digit code to control access. To install, separate the halves, place one on each door rod, then slide the smaller tube into the larger until secure and set the dials or depress the lock button per instructions. The combination can be changed as needed when access control or personnel turnover requires it.

• Prebuilt four-digit combination for keyless access
• Changeable code for shared-user scenarios
• Simple assemble-and-slide operation for quick use
• Suitable for teams—no multiple keys to track

Who is this for? The Heavy Duty Cargo Door Lock is intended for truck drivers, fleet managers, construction site supervisors, and shipping operators who need a rugged, visible, keyless way to secure trailer and container doors. It’s ideal when you want a non-permanent, reusable locking solution that deters theft, reduces key management, and works in outdoor, salt-air, and heavy-use environments.

Note: For installations with bar spacing outside the 9 3/4"–16" range, consider the manufacturer’s extension kit (sold separately). Always follow on-vehicle safety precautions and company security policies when installing or removing the device.