Master Lock Pro Series Hidden Shackle Padlocks Keyed Alike 6271NKA-2

In this review of the Master Lock Pro Series Hidden Shackle Padlocks keyed alike set, the bottom line is simple: these are heavy-duty locks built for commercial and industrial use where cut and pry resistance matters most. The listing is for two keyed alike padlocks with four keys included, and the single biggest reason to buy is the combination of a fully shielded hardened boron alloy shackle and BumpStop advanced cylinder technology, which together focus on physical toughness and resistance to the common bumping attack.

Key Features

• Keyed alike set: Two locks come keyed alike with four keys included so multiple points can be secured with a single key for convenience.
• Hardened body: The diecast zinc body is built to resist corrosion and daily wear in transportation and industrial settings.
• BumpStop technology: The advanced cylinder design prevents force transfer from a bump key, reducing vulnerability to bumping attacks.
• Bolt cutter tough shackle: The fully shielded hardened boron alloy shackle is designed to resist cutting and prying attempts.
• High security cylinder: The 6-pin cylinder is made for maximum pick resistance and the cylinder is removable for replacement or repinning.
• Compact dimensions: The lock size fits many hasps and latches used on trailers, gates, vending, and industrial equipment when measured to the provided schematic.

Who It's For

These padlocks are aimed at users who need robust, commercial-grade security for items like enclosed trailers, gates, vending machines, and industrial doors. Contractors, fleet managers, and anyone who values physical resistance to cutting, prying, and bump-style attacks will find the locks appropriate.

Buyers who need ultra-lightweight locks for casual home use or a specific nonstandard hasp fit should look elsewhere; several customers noted fit can be an issue if the hasp clearance is not measured carefully. Also, those who require electronic or keyed-different keyed systems should choose a different product.

Pros & Cons

Pros

• Very sturdy build with a hardened diecast zinc body that resists corrosion and abuse.
• BumpStop advanced cylinder technology reduces the risk of bumping compromise.
• Fully shielded boron alloy shackle provides strong resistance to bolt cutters and prying.
• Keyed alike convenience with four keys included makes managing multiple locks easier.

Cons

• Some buyers report fit issues with certain hasps, so measuring prior to purchase is important.
• There are occasional customer reports of key fit problems, so check keys when received.

Specifications

Our Verdict

The Master Lock Pro Series hidden shackle keyed alike set is a sensible choice for those who need tough, commercial-grade padlocks that resist cutting, prying, and bumping. It offers clear value for trailers, gates, vending, and industrial use when the hasp fit is confirmed, and the keyed alike convenience with four keys makes it practical for fleets or multi-point security.

Frequently Asked Questions

Are these locks keyed alike?
Yes, this listing is for two keyed alike locks and four keys are included so both locks operate with the same key.

Will the lock resist bumping?
The lock uses BumpStop advanced cylinder technology designed to prevent force transfer from a bump key and reduce vulnerability to bumping attacks.

How do I ensure the lock fits my hasp?
Measure your hasp or latch against the provided schematic dimensions; several customers noted fit problems when measurements were not checked.