Master Lock Model M530

Notes for this lock are not complete. But, by all means read away!

Summary#

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The lock I purchased was the Master Lock Model M530 DF to be more specific.

I found the Master Lock Model M530 going to the padlock aisle in a Home Depot and I thought I’d pick it up to see what it’s all about. Just by looking at it and watching videos of it online in the past I could tell that I could gut (take apart) the lock. So in essence I walked away with a little puzzle. I took it home. Played with the keys for a little bit, picked it, researched it, took it apart, etc. This is my lock library entry with all of the information related to the Master Lock Model M530 providing my findings and information about the M530 itself.

I’m happy to say that this is the first lock/padlock that I’ve gutted for the purposes of learning more about this lock. Details about the lock can be found in the next section where I explain more about the lock.

After reading reviews online. On Amazon the reviews for this lock are good. I saw one review where removing the keys from the packaging required a lot of effort. I will say that I picked this padlock out of the packaging before removing the keys from the packaging because I couldn’t remove them. Making removing the keys from the packaging probably the best security feature of this lock.

That is not to take away from the fact that this will keep your honest bystander out of the container it’s supposed to deny access to. But, let’s go through this lock before I provide my full opinion.

Master Lock Model M530#

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It doesn’t look like this lock is listed on the Master Lock website anymore. So, I’ve been pulling information from different sources. This includes resellers and r/lockpicking on Reddit.

The Master Lock Model M530 is labeled as a heavy duty outdoor padlock with a Boron-Carbide Shackle and a weather resistant solid steel body. Providing a four-pin pin and tumbler cylinder and a dual ball bearing locking mechanism. Of course. This padlock comes with two keys.

History#

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I will include some history of this lock to provide context after I’ve completed research on it. Stay tuned for more in the future.

Intended Use:#

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Resellers market this as a good gate lock, shed lock, and storage locker lock. This could potentially be used to lock the backs of box trailers.

Materials Used:#

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Just a little overview of the materials used in the lock casing. This was something about the lock I was impressed with given the construction provided. Boron-carbide is the third strongest substance known to date. Though, I’ve seen videos from YouTube channels like the LockPickingLawyer in one of his videos (765¹) where he uses a pair of hydrolic bolt cutters to cut the shackles.

The video referenced previously gives me a pretty good idea of what will and wont work with the Master Lock Model M530 shackle. In the video he discusses breaking into the lock and expressed that a hack saw or regular bolt cutters didn’t work. He also features the Master Lock Model M530 in video (1408²) where he uses a Ryobi Bolt Cutter to cut through the lock.

• Lock Body: Solid Steel
• Lock Shackle: Boron-carbide³

Dimensions:#

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Here are the dimensions for the lock I purchased. This may vary depending on the lock. Normally I see varying dimensions depending on the lock. There were multiple sizes of the Master Lock No. 1. But, I haven’t seen it with this padlock.

• Lock Full Length: 4 in. (100 mm.)
• Lock Body (Width): 1-3/4 (1.86) in. (44 mm.)
• Shackle Length (Clearance): 2 in. (51 mm.)
• Shackle Width: 13/16 (0.75) in. (21 mm.)
• Shackle Diameter (Octagonal⁴): 9/32 (0.3) in (7 mm)

Cylinder:#

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The cylinder is pretty simple. There was just a lot of counter rotation due to all of the spool pins in the lock. All meaning in all four pins had spool pins.

• Pin Quantity: Four-pin
• Type: Pin and tumbler

There is another model that Home Depot sells where they claim to have 5-pin padlocks. So I will need to search for that.

The DF model I know for sure contains Spool pins as security pins. This may not be the case for other/older models of this padlock.

(This can be seen on the bottom of the lock where the model number is visable.)

Where To Find These Locks#

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These locks can for sure be found in hardware stores like Ace hardware, Home Depot, Lowes, Menards, etc. in the midwest. Amazon is also selling these locks if anyone is looking for an online option.

What are these locks used for?#

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Can see these locks used for locking up trailor hitches (if it fits), sheds, doors on enclosed trailors, tool boxes, etc. in comercial and residential settings.

Lock Pickers United Rating (Unknown)#

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The Master Lock Model M930 does not have a rating or belk rank associated with it with the Lock Pickers United belt system. I’m providing this for the benefit of having it in this lock library.

Though there is a possibility that no one will recieve a rank from submission. Post it on r/lockpicking anyway and interact with the community. Pick the lock and gut the lock and post it to get the conversation going. You may learn a few things you didn’t know along the way.

Gutting The Master Lock Model M530#

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This is one of the first padlocks I owned that could be easily diassembled/gutted. There is a single screw found in the shackel well on the left side of the lock. Where a philips head screw driver can remove the screw. Once this screw is removed. The plate holding the core of the lock can be removed exposing the core of the lock.

Vulnerabilties#

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Here is where I discuss the vulnerabilities associated with this lock. What worked with a brief summary of what didn’t work for me. This will be provided after I’ve exhausted testing. Down the road as I progress some attacks may become easier. Just depends on the day in some cases.

Picking Attacks#

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With the Master Lock Model M530 I was focused more on the picking attacks. This lock in particular was frustrating initially. But, as I kept coming back to it after focusing on learning how to pick locks and not just a lock. Picking the Master Lock Model M530 became easier.

Single-Pin Picking#

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For picking the Master Lock Model M530 I used the Covert Instruments Short Hook in 25 (0.025) thousands of an inch with a Covert Instruments Precision 2 in 1 Turning Tool in 30 (0.030) thousands of an inch. Using bottom of the keyway tension with heavy tension and gradually reducing tension whenever I felt counter rotation from one of the spool pins.

Note: Pick the tool that works best for you. I am merely providing the tools that worked best for me while picking this lock.

Initially I used the Covert Instruments Short Hook in 20 (0.020) thousands of an inch. But, found I didn’t get as much feedback as I did from the Covert Instruments Short Hook in 25 (0.025) thousands of an inch. It might have been the day. But, the keyway is wide enough where I can get away with it. So, it doesn’t really matter.

If this was a Mossberg & Sons Cable Lock (link will work in time.) I would need the 20 (0.020) tousands of an inch thickness though. At the end of the day. It’s about what tool works best for the job.

A video will be recorded and posted here when it is finished.

I will say that this lock may be a useful reference for anyone who struggles with spool pins. Given that all pins - at least in the M530 that I bought - are spool pins. This lock provides a good reference for anyone that wants to get a feel for counter rotation or detecting false sets within the lock.

Conclusions & Opinions#

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There is good and bad when it comes to the Master Lock Model M530. The materials used in this lock aren’t bad. They can stand up to the average cutting attack on the shackle. Given that I don’t know of to many theives carrying around manual hydrolic cutters. But, you never know. These are interesting times.

When it comes to picking though. This is a pretty easy lock for me despite the spool pins. I’ve found better luck single-pin picking the Master Lock Model M530. But, I will continue looking into other vulnerabilities. But, single-pin picking works best for me.

My favorite part of this lock was the ability to gut/disassemble it after it’s unlocked. Which I’ve provided in the Gutting The Master Lock Model M530 section. I think my enjoyment comes from this being the first lock that I’ve gutted. But, we all have to start somewhere.

Would I use the Master Lock Model M530 for anything? Yes. To keep kids out of certain things or for semi-long term storage. Yes. I would use this to keep honest people, kids, and some theives out. But, apart from that. I probably wouldn’t use this lock. Just because I know I can pick this and I am by no means an expert at picking locks. I normally pick them within a controlled environment either in a vise or in the palm of my hand. The short answer is yes and no. It depends on what I’m attempting to protect and who I’m protecting the access from.