CURT 2" Trailer Coupler Class 2 3,500 lb GTW Zinc-Plated Posi-Lock for 2" Channel

Built for trailer owners who want a dependable replacement or an upgrade while fabricating a trailer, this CURT Posi-Lock coupler combines simple installation with a corrosion-resistant finish. The unit is manufactured from die-cut, punched steel and finished in zinc to resist weathering. A spring-loaded Posi-Lock latch with an adjustable nut lets you dial in a snug fit on the ball and lock the connection for added security.

How does the K-5153 attach to my trailer tongue?

The coupler is designed to mount directly onto a 2" wide straight trailer tongue channel. Installation requires aligning the coupler over the tongue, securing it with the factory-compatible fasteners, and tightening the internal adjustment nut to remove any play when latched.

• Fits a 2" wide trailer tongue channel for straightforward bolt-on mounting.
• Internal adjustable nut lets you set a firm, rattle-free connection.
• Posi-Lock mechanism accepts a safety pin or coupler lock for theft and detachment protection.

What towing capacity and ball size does it support?

This CURT coupler is rated as a Class 2 coupler with a 3,500 lb gross trailer weight (GTW) capacity and a 500 lb tongue weight limit. It is engineered to couple with a standard 2" diameter trailer ball, which is the most common size for light trailers and utility loads.

• 3,500 lb maximum gross trailer weight for light to medium loads.
• 500 lb tongue weight capacity to match common towing setups.
• Designed specifically for a 2" trailer ball—no adapters required for correct fit.

What features improve durability and safety?

The coupler uses heavy-gauge punched, die-cut steel for structural strength and a zinc plating to resist rust from rain, road salt, and marine environments. The Posi-Lock latch is spring-loaded to keep the ball secured under vibration, and it can be locked with a pin or aftermarket coupler lock for additional peace of mind.

• Zinc finish protects against corrosion for longer service life.
• Spring-loaded Posi-Lock latch reduces accidental disengagement risks.
• Accepts safety pins or coupler locks to prevent unauthorized separation.

How easy is it to adjust and maintain?

Adjustment is straightforward: loosen or tighten the internal nut to remove slack between the ball and coupler, then verify a snug fit when latched. Routine maintenance is minimal—periodic inspection, lubrication of moving parts, and checking the finish will keep it performing reliably.

• Simple internal adjustment nut for quick fit tuning.
• Low-maintenance zinc plating that withstands ordinary road use.
• Inspect latch and fasteners before each tow for safe operation.

Who is this for: The CURT K-5153 is aimed at owners of small utility trailers, boat trailers, campers, and DIY trailer builders who need a robust, serviceable coupler that fits a 2" ball and 2" channel. It’s a practical choice when you want a reliable, adjustable mounting coupler with corrosion protection and the option to secure the latch.

All CURT couplers are backed by CURT's limited lifetime warranty, providing added assurance for everyday towing and replacement projects.