Coupler lock MASTER LOCK Universal trailer coupler lock Silver Flat key

The MASTER LOCK No. 377EURDAT is a universal trailer coupler lock with a silver finish and a flat key mechanism, designed to secure common trailer couplers. It fits 48 mm, 51 mm and most 59 mm couplers and incorporates a locking mechanism engineered to resist picking, prying, rust and corrosion. The product is backed by a Limited Lifetime Warranty from the manufacturer.

Advantages

The lock fits multiple common coupler diameters, uses a flat key for operation, and is constructed to resist picking and prying. Its surface finish helps resist rust and corrosion, and the design allows straightforward installation and removal.

Suitable for

• Securing trailers with 48 mm couplers
• Securing trailers with 51 mm couplers
• Securing trailers with most 59 mm couplers
• Owners who prefer a flat key locking mechanism

Key specifications

• Brand: MASTER LOCK
• Model / MPN: 377EURDAT
• EAN: 3520190922793
• Compatible coupler diameters: 48 mm, 51 mm, most 59 mm
• Lock type: Flat key mechanism
• Colour: Silver
• Corrosion resistance: Yes (resists rust and corrosion)

How to use

Place the coupler lock into the trailer coupler opening so the lock body spans the coupler throat, then insert and turn the flat key to engage the locking mechanism. Verify the lock is securely seated and the key removes only after full engagement. To remove, insert the flat key, turn to unlock and withdraw the lock from the coupler.

Recommendations

The lock is intended for use on compatible trailer couplers (48 mm, 51 mm and most 59 mm). Regularly inspect the lock for signs of wear or corrosion and lubricate the keyway periodically according to manufacturer instructions to maintain smooth operation.