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Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle

Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle

Item # ML1KA
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Our Price: $14.85
Shipping Weight: 0.61 lbs
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Master Lock Padlocks - ML1KA
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This heavy-duty padlock boasts a laminated steel casing, a hardened steel shackle, and steel tumblers. The lock resists drilling and picking, and the dual locking levers make it tough to pry. Multiple locks can be keyed alike. Includes 2 brass keys. Lowest Prices for the best padlocks from Master Lock. Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle part number ML1KA can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (3)
  • Q & A (15)
  • Videos (1)
  • Photos
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Master Lock Padlocks - ML1KA

  • Master Lock
  • Universal Application Padlock
  • 5/16 Inch Diameter
  • Keyed Alike
  • Steel

This heavy-duty padlock boasts a laminated steel casing, a hardened steel shackle, and steel tumblers. The lock resists drilling and picking, and the dual locking levers make it tough to pry. Multiple locks can be keyed alike. Includes 2 brass keys.


  • Commercial-grade padlock helps secure your gear
  • Laminated steel lock body is durable and corrosion resistant
  • Case-hardened steel shackle resists cutting
  • Dual internal locking levers provide extra pry resistance
  • 4-Pin lock cylinder with steel tumblers resists drilling and picking
  • 2 Brass keys included
  • Keyed-alike option - select "Keyed Alike" above to order multiples of this lock keyed alike


  • Overall width: 1-3/4"
  • Shackle diameter: 5/16"
  • Shackle length: 15/16"
  • Dimensions of opening with shackle closed: 15/16" tall x 3/4" wide
  • Limited lifetime warranty

1KA Masterlock Laminated Steel Pad Lock - Keyed Alike - Qty 1

Video of Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Master Lock Padlocks - Universal Application Padlock - ML1KA Review

Today we're going to be taking a look at part number ML1KJA. This is the Master Lock Laminated Steel Padlock. This is a commercial grade padlock that's going to help secure your gear. It's going to be perfect for many different applications. Padlocks are very versatile. You can use them to lock up your shed, your tool box, any equipment that you may have.

Again, padlocks are just one of those locks that's always nice to have. A lot of people like to secure the doors on their trailers, gates. That kind of stuff. Nice secure device. It's going to be featuring a laminated steel lock body.

It's very durable and strong as well as corrosion and rust resistant. It's going to feature a case harden steel shackle. Very strong and durable. It's going to be very difficult to cut through, so it's cut resistant. Internally it's going to be featuring duel internal locking levers. That's going to provide extra pry resistance as well as bump up the level of security that this padlock offers.

It's going to have the four pin lock cylinder with steel tumblers. That's going to be very difficult to drill into, so the lock body is going to resist drilling as well as picking. You're going to get two brass keys with this lock. Both keys are going to keyed alike. Either one will work on the lock body. Now this padlock also has a keyed alike option available that way you can order multiple locks and get the same keys, so one key would operate as many locks as you want to order. A few measurements that we're going to go over with you real quick.

Starting with this one right here, measuring outside edge to outside edge, that's going to be about one and fifteen sixteenths of an inch. Measuring this direction, from outer edge to outer edge, is going to be about one and one eighth of an inch. Then just measuring the lock body going this direction, that's going to give us a measurement of . Looks to be about one and three eighths of an inch. Right in that area. Overall length from very bottom to the top of the shackle is going to be about two and five eighths of an inch. Now the shackle diameter on this unit is going to measure five sixteenth of an inch. The opening, measuring in this direction, is going to be about fifteen sixteenth of an inch. Then the opening going this direction is going to be about three quarters on an inch. Master Lock is also going to put a limited life time warranty on this padlock. Really simple operation. Place the key in here. Give it a quarter of a turn. It's going to open that shackle. It's going to swivel all the way around. Put that around your application. Snap it back into place. That's going to do it for our review of part number ML1KA. This is the Master Lock Laminated Steel Padlock.

Customer Reviews

Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle - ML1KA

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

This heavy-duty padlock boasts a laminated steel casing, a hardened steel shackle, and steel tumblers. The lock resists drilling and picking, and the dual locking levers make it tough to pry. Multiple locks can be keyed alike. Includes 2 brass keys.


It's a lock. 693264


Bought this to lock the hitch on our Airstream. Wanted a lock with a 5/16" shackle, this one has it. 378229


Works great 239039


Ask the Experts about this Master Lock Padlocks

  • Is B&W Extend-A-Goose Coupler Compatable with EZ Lock Gooseneck Coupler Lock?
    The B&W Extend-A-Goose Gooseneck Coupler - 2-5/16" Ball - 10" Offset - 24,000 lbs # BWTEXA4200 is not compatible with the EZ Lock Gooseneck Coupler Lock Combo - Bulldog/Stallion/Superior/T.E.M. Gooseneck Couplers # BLTL-53-40D2. The Extend-A-Goose coupler does have an integrated lock so you can secure the trailer with a padlock like # ML1KA. You can see this shown at the 1:06 minute mark of the attached video.
    view full answer...
  • Replacement Door Latch for Bumper Pull Horse Trailer
    We do have latches which will solve your issue, though we not have specific parts lists for trailers. If you measure the distance between the mounting holes you may find a direct fit, and the lock will also need to be wide enough. You may also be able to install for something like the Master Lock Straight Bar Hasp # 730DPF along with padlock # ML1KA. I've added a link to a video review of this hasp as well as a link to the door hardware we carry for you to take a look at.
    view full answer...
  • Malone Microsport XT Trailer Compatibility with Spare Tire Holder
    The Spare Tire for Malone MicroSport Trailer # MPG465 will fit on the Malone MicroSportXT Trailer with Retractable Tongue # MPG460XT. You may also be interested in a padlock like # ML1KA for that application. For your Subaru OEM ball mount, the Curt 2" Hitch Ball - 3/4" Diameter x 2-1/8" Long Shank # C40018 is the correct fit.
    view full answer...
  • Recommended Padlock Compatible with Demco 5th Wheel Rail Adapter for Ford Towing Prep Package
    The Master Lock Laminated Steel Padlock - 1-3/4" Wide - 5/16" Diameter Shackle # ML1KA can be keyed alike and will work very well to secure your Demco 5th Wheel Rail Adapter for Ford OEM 5th Wheel Towing Prep Package # DM6175.
    view full answer...
  • Replacement Lock Options for Thule Cascade Roof Box with Broken Lock Assembly
    The lock assembly for a Thule Cascade box is not a replacement part. The core can be replaced, but not the entire assembly according to my tech contact at Thule. So you will either need to go with a different option for a lock assembly or replace the roof box. My recommendation is to use the locking latch # SR03807, lock locator # TH03808, and the lock bracket # SR00841. This will allow you to rivet the lock bracket in place and allow you to lock your cargo box. Another option...
    view full answer...
  • What Size Lock Is Needed for the Fastway ONEstep XL Wheel Chocks
    In order to lock the Fastway ONEstep XL Wheel Chocks part # FA84-00-4150-2 you can use any pad lock with a shackle thickness up to 3/8". For this, the Master Lock Laminated Steel Padlock part # ML1KA will be a good option and it can be keyed alike so you can use one on both sides of the trailer. In order to install the pad lock simply insert the lock into one of the unused holes in the center of the arms, or into the top hole on the wedge.
    view full answer...
  • Spare Tire/Wheel Combo and Tire Carrier for 2005 Load Rite PWC Trailer w/ 205/65-10 Tires
    Since you'll be dealing with a marine environment, I'd recommend using a galvanized wheel. I'm assuming your existing wheels have a 5 on 4-1/2 inch bolt pattern. If a load range C tire (1100 lb capacity per tire) capacity is sufficient, the # AM3H400 wheel/tire combo would be work well for you. If you need a heavier weight rating, go with # AM3H440 which is a D rated tire with a 1330 lb per tire rating. For a spare tire carrier, I'd recommend the CE Smith # CE22011Z and the padlock...
    view full answer...
  • Is the B&W # BWTEXA4200 Compatible with a 1988 Barrett Gooseneck Trailer
    To determine whether or not the B&W Extend-A-Goose Gooseneck Coupler # BWTEXA4200 is compatible with your 1988 Barrett Gooseneck Trailer you will simply need to measure the outer diameter of your current inner tube. If the outer diameter of your current inner tube measure 4 inches (which is a standard size) then this coupler will fit and is a great option to add some extra clearance. If you would like to add some security to your setup you can use the Master Lock Laminated Steel Padlock...
    view full answer...
  • Rear Door/Ramp Latch for Holding Horse Trailer Ramp in Place
    Sounds like you have a rear ramp/door on a horse trailer and need a cam style latch to hold it in place when shut. For that the 36" Lock Side-Door Bar Lock Assembly # 305736 can be used for this. It would be just a matter of mounting the assembly on top of the ramp/door to hold it up there. Or you could use two of these, one on each side and that would work as well. There are holes on the latches that you can run a padlock through like the # ML1KA. If you have something totally different...
    view full answer...
  • Will the Padlock Bracket Part # CE26002Z-2 Fit the Replacement U-Bolt Part # CE22011Z
    Yes, the CE Smith Padlock Brackets part # CE26002Z-2 will fit the Replacement U-Bolt for CE Smith Spare Trailer Tire Carrier part # CE22011Z. For a lock, I recommend using the Master Lock Laminated Steel Padlock part # ML1KA.
    view full answer...
  • How to Repair Thule Cascade 1500 Rooftop Cargo Box with Punched Out Lock Housings
    Thule doesn't offer a replacement lock housing for the Cascade 1500, I'm sorry to say. In this situation, your best bet will be to either replace the box with something of similar size like the Thule Pulse Large Rooftop Cargo Box, part # TH615. The box has 16 cubic feet of storage space that can handle 6-8 pairs of skis up to 181 cm in length or 4-6 snowboards. As another option, you could repair the box after a fashion. Install two hasps such as part # 720DPF and lock the hasps with...
    view full answer...
  • Replacement Key for Master Lock Laminated Steel Padlock # ML1KA
    I went out to the warehouse and looked at some of our Master Lock Laminated Steel Padlocks # ML1KA which look like the one in your picture. None of them had a lock number stamped on them like the one in your picture does. If you are needing a key for a Padlock # ML1KA you will need go to with part # MLK1. When ordering a replacement key with part # MLK1 you will want to type the number on your key into the "Key Number" section. You will want to type in the number that is found on the...
    view full answer...
  • Thule weekender key replacement.
    Unfortunately, the # THKEYN139 won't work for you. The 139 and N139 lock are different. The 139 locks were used in the first generation of the Weekender cargo box, and Thule has long since stopped stocking replacement keys for it. You could see if a locksmith could make a key for it, or you could have the lock drilled out and come up with a different way of locking the box, like a hasp such as # 722DPF and a padlock like # ML1KA.
    view full answer...
  • Padlock for B&W Extend-A-Goose Gooseneck Coupler
    There isn't a specific padlock that goes with the B&W Extend-A-Goose Gooseneck Coupler # BWTEXA4200 so I went out to the warehouse to measure the diameter of the hole where a padlock would install. The hole is 0.337 inches in diameter so a lock with a 5/16 inch diameter shackle, # ML1KA, would be the best option.
    view full answer...
  • Offset Gooseneck Coupler Recommendation For A 2019 Chevy 2500HD Crewcab Short Bed.
    The B&W Extend-A-Goose Gooseneck Coupler # BWTEXA4200 provides an additional inch of clearance at 10" vs. the SB1, it is lockable with an # ML1KA padlock for additional security, and has a beveled gooseneck opening with spring-loaded handle that makes hook up easier vs. the SB1 quick release coupler in my opinion. The final reason I like this coupler is because of the quality construction. Made here in the USA with the gray powder coat finish that B & W is known for. For these reasons...
    view full answer...

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Info for this part was:

Installed by:
Cole B
Written by:
Brian B

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