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The Master Lock 647D is a compact, durable combination padlock featuring a 30mm metal body and a 5mm cut-resistant steel shackle. Its customizable 3-digit code eliminates the need for keys, making it ideal for securing gym lockers, luggage, backpacks, and cabinets. Designed for everyday reliability and backed by a Limited Lifetime Warranty, this lock offers professional-grade security in a sleek, travel-friendly package.























| ASIN | B000BD8MQ0 |
| Additional Features | Cut Resistant |
| Best Sellers Rank | #1,760 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #11 in Combination Locks |
| Brand | Master Lock |
| Brand Name | Master Lock |
| Color | Black |
| Control Method | App |
| Controller Type | Manual |
| Customer Reviews | 4.4 out of 5 stars 8,032 Reviews |
| Finish Types | Polished |
| Global Trade Identification Number | 00071649080050 |
| Included Components | Unit^Instruction Guide |
| Item Dimensions | 0.56 x 1.2 x 2.86 inches |
| Item Type Name | Combination Padlock |
| Item Weight | 0.08 Kilograms |
| Item dimensions L x W x H | 0.56 x 1.2 x 2.86 inches |
| Lock Type | Combination Lock |
| Manufacturer | Master Lock |
| Manufacturer Part Number | 647D |
| Material | Alloy Steel , Metal |
| Material Type | Alloy Steel, Metal |
| Model Name | 646D |
| Model Number | 647D |
| Number of Pieces | 1 |
| Recommended Uses For Product | Luggage |
| Shape | Rectangular/Irregular |
| Smart Home Compatibility | Not Smart Home Compatible |
| Special Feature | Cut Resistant |
| Style Name | Scrolling |
| UPC | 071649080050 |
| Unit Count | 1.0 Count |
A**S
Simple, reliable, and perfect for the gym
I bought this lock for everyday use at the gym and it works exactly as expected. The size is compact but still feels sturdy and secure. The combination is easy to set and remember, and the numbers turn smoothly without getting stuck. I like that I don’t have to carry a key around, which makes it convenient for lockers and travel. Build quality feels solid and durable for the price. Overall, a simple and reliable lock that does the job well. Definitely recommend if you want something small and hassle-free.
Z**K
Great lock.
This lock is super simple to set the code on and is very durable. I’ve personally tried to see if someone can pull it apart and you definitely can’t. The lock fits around most things you need to lock. Very secure.
Y**.
Perfect three digit lock
Very happy with the functionality. Always wanted a three digit lock. It’s plenty for a lock.
M**S
Durable and Safe!
The combination mechanism is straightforward to use and easy to reset, making them convenient for frequent travel. They feel durable enough to handle repeated trips and general handling. Overall, they are a practical and trustworthy that helps secure locker without the hassle.
L**G
Easy reset, fits on gym lockers.
Easy to reset. FIts on gym lockers. Bought this for my gym locker and its what i needed. Setting your combination takes about ten seconds. The black finish looks really slick. The lock feels solid and secure.
E**S
Reliable Locker Lock with Easy-to-Set Combo
Reliable Locker Lock with Easy-to-Set Combo This Master Lock combination padlock turned out to be just what I needed for gym and travel use. The compact size makes it easy to slip through locker or bag zippers, yet it feels sturdy and well-constructed. The black finish gives it a simple, low-profile look, which I like since it doesn’t draw attention. Setting my own 3-digit code was quick and painless—no fumbling with confusing instructions. The numbers turn smoothly, and the lock clicks shut securely without feeling flimsy. I tested it on a gym locker, a backpack zipper, and a small cabinet, and it worked consistently across all of them. It’s light enough for luggage yet strong enough that I trust it in everyday use. Something to keep in mind: this is designed for light to medium-duty use. It’s not meant for securing high-value items outdoors, as the shackle isn’t heavy-duty and the mechanism isn’t weatherproof. But for lockers, bags, or cabinets indoors, it’s perfect. Bottom line: A dependable, easy-to-use lock that strikes a good balance between portability and security for everyday needs.
P**Z
works for locker rooms
Very useful, not the highest rate of security but it works for gyms and locker rooms
F**H
Functional, small lock. Meets expectations.
Lock works as it should. I'm sure someone could smash it open, but its perfect for a gym or work locker. Mine did arrive with some damage, a small chip. The combination is easy to set with the instructions on the packaging. Press down hard when the instructions tell you to press down. You'll feel it.
N**O
Not good
Very hard to use , I couldn’t change the code even with YouTube videos
N**A
Secure and Easy to Use!
The Master Lock 647D is perfect for travel, offering a sturdy design and easy-to-set combination. Its compact size fits luggage, backpacks, and lockers, while the black finish looks sleek. Reliable and lightweight—great for peace of mind on the go!
R**D
Good product 💯
Good quality, received as advertised!
Y**F
Defect lock
BE CAREFUL!!!!! Don’t buy..... you can’t set your own combinations and you can’t return.... what a scam!!!!!!!⛔️⛔️
C**Y
Buen candado
Hasta el momento todo bien. Fácil uso y configuracion. . . .. . . . . . . . .
Trustpilot
2 months ago
5 days ago