Master Lock Keyed Alike Universal Trailer Coupler Locks 379KA-10 - One

In this review the focus is on convenience and fleet security: the Master Lock 379KA-10 is a pack of ten universal trailer coupler locks that all use a single key. For anyone managing multiple trailers, rental units, or a small fleet, the biggest reason to consider these locks is the keyed alike convenience combined with a robust zinc die-cast body and a design that resists blunt-force removal. Each lock ships with two keys, so a single purchase provides twenty keys and straightforward, repeatable protection against tow-away theft.

Key Features

• Keyed alike set: Ten locks all operate with one key for simple access across multiple trailers without juggling different keys.
• Two keys per lock: Each lock includes two keys, giving a total of twenty keys to distribute or keep as backups.
• Universal fit: The coupler lock fits 1-7/8in, 2in and most 2-5/16in couplers from common manufacturers for broad compatibility.
• Reinforced construction: Zinc die-cast body resists rust, corrosion and impact better than many alternative materials.
• Design resists blunt attacks: The lock sits on top of the coupler and can rotate, which makes downward hammer strikes and sledge attempts harder to succeed.
• Rekeyable cylinder: The cylinder can be rekeyed for added convenience and improved key management if needed.

Who It's For

This pack is ideal for small business owners, contractors, and fleet managers who need multiple trailer locks that operate with a single key. If you maintain several trailers or tow vehicles and want a simple, repeatable locking solution that fits common coupler sizes, this set removes the hassle of managing many different keys.

Those who want the absolute highest level of high-security locking or an electronic solution may prefer purpose-built heavy-duty hitch locks or alarmed devices; likewise, single-lock buyers who only need one coupler lock should consider a single-unit purchase instead of a 10-pack.

Pros & Cons

Pros

• All ten locks keyed alike simplifies access and reduces key clutter for operators.
• Zinc die-cast construction offers good resistance to corrosion and impact for outdoor use.
• Universal fit covers the most common coupler sizes, reducing compatibility worries.
• Two keys per lock provide immediate spares for distribution or backup.

Cons

• Some customers report mixed impressions of build quality compared with heavier specialty locks.
• The pack is keyed the same by default, so ordering multiple packs will result in identical keys unless rekeyed later.

Specifications

Product type	Trailer coupler/tongue locks (10-pack)
Keying	Keyed alike set (one key opens all)
Included keys	Two keys per lock (20 keys total)
Fits coupler sizes	1-7/8in, 2in and most 2-5/16in
Material	Reinforced zinc die-cast
Weight per lock	2.4 lbs each
Warranty	Limited lifetime warranty

Our Verdict

The Master Lock 379KA-10 is a practical, cost-effective solution for anyone who needs multiple trailer locks that use a single key. Its universal fit, corrosion-resistant zinc body, and anti-blunt-force design make it a sensible choice for fleet or multi-trailer use; buyers seeking the absolute highest heavy-security hardware might opt for other specialty locks, but for value and convenience this set delivers strong everyday protection.

Frequently Asked Questions

Will all locks arrive with the same key?
Yes, the 10-pack is keyed alike by default so the same key operates every lock.

What coupler sizes does this lock fit?
The lock fits 1-7/8in, 2in and most 2-5/16in couplers used by common manufacturers.

Can the cylinder be rekeyed?
Yes, the cylinder is rekeyable for convenience or to change keying later.