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Master Lock

Master Lock Black Combination Lock, Customizable Combo Padlock, Indoor and Outdoor Weather Resistant Lock with Resettable Code for Gates, Lockers, 4 Pack, 178EC4

  • Based on 14,438 reviews
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jul 1
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Style: Set Your Own Combination, 4 Pack


Features

  • Indoor and outdoor padlock is best used as a school locker lock, gym lock, and gate lock, providing protection and security from theft
  • Set your own four-digit combination lock for easy combination recall; Combination change tool included
  • Combo lock is constructed with a solid body for strength and weatherability, hardened steel shackle for cut resistance
  • 2 inch (51 millimeter) wide lock body; 5/16 inch (8 millimeter) diameter shackle with 1 inch (25 millimeter) length, 1 inch (25 millimeter) width
  • Includes four set your own combination locks
  • Shackle is preset to open on 0-0-0-0.

Description

The Master Lock 178EC4 Set Your Own Combination Padlocks feature a 2in (51mm) wide solid body for strength and reliability. The 5/16in (8mm) diameter shackle is 1in (25mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-digit dialing allows for thousands of possible numeric combinations. Includes four set your own combination locks. The Limited Lifetime Warranty provides peace of mind from a brand you know and can trust.

Brand: Master Lock


Special Feature: Padlock


Lock Type: Combination Lock


Item dimensions L x W x H: 0.96 x 2 x 2.91 inches


Material: Alloy Steel


Brand Name: Master Lock


Recommended Uses For Product: Security


Number of Pieces: 4


Included Components: Combination Padlock 4 pk


Model Number: 178EC4


UPC: 071649370571


Model Name: Combination Padlock 4 pk


Global Trade Identification Number: 71


Manufacturer Warranty Description: Limited Lifetime Warranty


Manufacturer: Master Lock


Manufacturer Part Number: 178EC4


Item Type Name: Combination Padlock 4 pk


Additional Features: Padlock


Lock Type: Combination Lock


Controller Type: Hand Control


Control Method: Touch


Style Name: Set Your Own Combination, 4 Pack


Color: Black


Shape: Rectangular, Square


Material Type: Alloy Steel


Finish Types: Polished


Item Dimensions: 0.96 x 2 x 2.91 inches


Item Weight: 1.38 Kilograms


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Similar Products

Top Amazon Reviews

    • Excellent and durable
Style: Set Your Own Combination, 2 Pack
Don’t waste your money on no name crappy locks or you’re just going to have problems that waste more time and money than you can save on cheap crappy locks. These are very solid. Only thing to watch out for is don’t lose the little key-like tools used to set the combination. These aren’t keys, just little twist levers only needed to change the combo (which requires unlocking the lock so they don’t need to be keys). ... show more
Reviewed in the United States on June 8, 2026 by Omega Man
    • Stop looking get this one
Style: Set Your Own Combination, 2 Pack
Solid lock combo lock, pay the extra few dollars and get this instead of some cheap off branded lock. I have 3 of these now and recommend them. I've left these out in the rain and snow and they've held up great
Reviewed in the United States on June 5, 2026 by Scott
    • Great for sheds. Great for sheds.
Style: Set Your Own Combination, 1 Pack
Review Image by Randy
Review Image by Randy
Review Image by Randy
This is a review of the Master Lock 178D Set Your Own Combo Padlock. I will do my normal list of specs-cool features and then list a summary as to my thoughts after using. -This is made of die cast metal and has a black finish to help protect it from the outside elements.) -It has a 2” wide die cast case and a 1” shackle. Diameter of the shackle is 5/16”. -Comes with 1 change key. -Operate by using a four digit number combination you set. -Unlike a lot of locks, this is a very well built solid lock designed for outdoor use. -To use, enter the combo and push down the shackle and then pull it up to unlock. Summary – I am using these on my two sheds. The combo is easy to set. You simply unlock the lock – open the shackle, insert the key – turn 90 degrees, set the combo of your choice and then remove the key. I really like this feature as I wanted my two sheds to have the same combo so I do not forget and for simplicity. The movement of the dials has a slight clicking and bump feel as you move the numbers vs. being an easy roll. (Might get smoother with time.) I like this as it is easy to lock your digits in and know they are aligned right. Whatever you do, do not forget the combo. The key is only for changing the code and will not open the lock. I am very happy with this lock and all master locks in general so far. Good make and reliable. Highly recommend. ... show more
Reviewed in the United States on March 7, 2016 Reviewed in the United States on March 7, 2016 by Randy
    • Durable & easy to use
Style: Set Your Own Combination, 4 Pack
Have purchased 20 + of these locks. Love the ability to customize combination. Secure and Durable. Only issue if locks are are used outside in upward or harsh weather conditions numbers wear out and begin to stick.
Reviewed in the United States on January 4, 2026 by Lacyea Guilbeaux
    • Works well for pre-teens
Style: Set Your Own Combination, 1 Pack
I bought this because my 12 year old was struggling with the one bought locally- this one was recommended online and it has worked very well
Reviewed in the United States on May 28, 2026 by sharon forquer bonnett
    • Decent combination lock.
Style: Set Your Own Combination, 1 Pack
Seems like a good quality padlock. I like the fact that you can set your own combination. No more remembering some abscure random numbers. Time will tell on the durability.
Reviewed in the United States on May 22, 2026 by Stephen R. Hardison
    • I bought two to replace old versions of the same product
Style: Set Your Own Combination, 1 Pack
We lock our front and back gates with these locks. They are in the elements, unprotected from sun/rain. The last ones (same model) were in service since 1994(!), and were good reliable easy to use locks. They were 'used' (unlocked/locked) several times a week. I decided to replace them because the numbers on the combination wheels were becomming a bit corroded and difficult to read, they were getting more difficult to turn (not that bad though), and the lock mecahnism wasn't working as well as it used to. Sometimes the lock didn't latch when locking, and you had to bang it on the gate to get it to latch. I tried lubricating the locks with triflow, which helped for a couple weeks, but then became stingy again. I thought that after 19 years, I could afford to buy a couple more. So I've been using the two replacements for a month now, and they're great. The numbers are easier to read, the wheels are easy to turn, and the lock mechanism works perfectly. I assume these will last ~20 years like the last set. By the way, it's a bit counter-intuitive, but to open the lock, set the dials to the combination, then push the shackle *IN* to disengage the lock. Some people set the number, then pull, but that's not it works. ... show more
Reviewed in the United States on January 15, 2013 by Gadget Fanatic
    • Good value for a good product
Style: Set Your Own Combination, 2 Pack
Solid security at a reasonable price. Easy to set combo.
Reviewed in the United States on April 10, 2026 by PapaPanny

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