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Your cart is empty. FEATURING BumpStop TECHNOLOGY - Lock bumping a surprisingly simple method of breaking in through locked doors and padlocks - is undoubtedly the newest emerging threat to personal property security. And virtually all locks in use today are particularly vulnerable to bumping. Until now...
BumpStopô Advanced Cylinder Technology employs an innovative, patent pending design which utilizes a unique reverse rake tapered driver pin, high performance springs and tightly machined cylinder chambers. During a bump attempt, this design prevents the transfer of force from the bump key to the pins and therefore blocks rotation of the cylinder so that the lock remains locked.
ProSeriesÆ Reinforced Zinc Die-Cast
Why Zinc Castings?
For countless decorative and functional applications no other material and process can match the properties and economics of zinc die casting.
Toughness:
Few materials provide the strength and toughness of zinc alloys. Impact resistance is significantly higher than cast aluminum alloys, plastics, and grey cast iron.
Strength & Ductility:
Zinc alloys offer high strengths (to 60,000 psi) and superior elongation for strong designs and formability for bending, crimping and riveting operations.
Anti-Sparking:
Zinc alloys are non-sparking and suitable for hazardous location applications such as coal mines, tankers and refineries
Mike Brawnson
2025-08-30 13:46:09
Very strong and tamper proof
No Prob Rob
2025-08-24 12:18:19
They are working great. Seem to be very durable. Good to have 3 keyed alike as my cargo trailer uses 2 on the rear door/ramp and 1 on the side door. Will update this review if there are any issues in the future.
amazon.jungle
2025-08-14 10:30:15
MASTER locks are always very good quality. I shelled out a little bit more for the brand because my other MASTER lock brands have been decades and decades reliable. So why bother with the other brands.
T.J.
2025-07-15 18:14:59
These locks work well and they seem strong. Before buying, I saw some other reviews that mentioned that the logo is turned sideways on these locks, and I was worried that the key opening would be on the side. The key opening is perfect for what I'm doing -- see the attached pictures.
R Young
2025-06-19 10:14:22
This is a very good lock. Same as the lock it is replacing except the keyhole is on the side so the word MASTER is sideways. The original lock body withstood someone beating it repeatedly with a hammer or other heavy object trying to force it open. The hidden shackle design prevented them from getting to the shackle and cutting it. I continued to use the same lock for years. I am only replacing it now because of missing keys.
Matt
2025-06-04 10:52:50
Master is one of the best in the industry. I compared these to another not so well know manufacture, these were far superior. Not saying these are perfect but they are the best you are going to get at this price point.
Matthew
2025-04-25 17:31:40
Work just like my old ones there worth the buy
mdyson
2025-04-13 21:49:48
Heavy, solid construction, good value.
MarÃa Dolores
2025-04-04 10:10:57
Lo mejores candado para proteger tu hogar y centros de trabajo excelentes.
Dave
2025-03-31 13:38:04
The locks work great. Like any lock, you will need to lube them up once in a while or they will not work smoothly.
Interlake Hunter
2025-01-23 11:12:30
All keyed the same.
Edgar
2025-01-20 14:08:56
Resistente, buenos materiales. Es pesado pero vale la pena.
Hiebert
2024-11-25 16:28:15
Purchased a pack of four puck locks. One puck lock would not unlock once installed so I had to have a locksmith drill out and replace the cylinder.
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