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Master Lock 6621 Pro Series Weather Tough IC Padlock
Model: 6621
OVERVIEW
Choice of 22 Key-in-Knob keyways to match this padlock to your security door locks. See Related Information for options.
Ideal for harsh outdoor conditions - exclusive Weather Tough® cover
Master Lock
Starting at
$36.01
$33.59
OVERVIEW
- Use your smartphone to open and manage your lock with the Master Lock® Vault System compatible with both Master Lock Vault Home and Master Lock Vault Enterprise
- The free Master Lock Vault Home iOS and Android apps are designed for personal use, supporting up to 10 locks, allowing you to monitor access history and includes a Locker Mode setting that allows for storage inside a locker
- The free Master Lock Vault Enterprise iOS and Android app and web interface are designed for business applications working with many locks and many users allowing you to easily monitor access with robust data and audit trails
- No keys to lose, no combinations to forget. No unauthorized key duplication.
- Share access with others - temporary or permanent
- Backup access using directional code on lock keypad
- Low battery notification & reminder on padlock and in app
- Comes with easy to replace CR2450 battery
- Battery jump allows for temporary access if battery dies while locked
Manufacturer Resources
Product Specs
- Subcategory:
- Padlocks
- Series:
- 4400 Series
- Keyed:
- Yes
- Product Group:
- Other \/ Miscellaneous Hardware
- Product Subgroup:
- Padlocks
- Product Type:
- Padlocks
- Commercial/Residential:
- Residential
- Shackle Diameter:
- 9/32" (7mm)
- Shackle Width:
- 13/16" (21mm)
- Padlock Body Width:
- 1-29/32" (47mm)
- Product Category:
- Door Trim and Accessories
- Department:
- Door Hardware
Master Lock 4400D – Frequently Asked Questions
1) Can I get into a Master Lock 4400 Bluetooth padlock if my phone is dead or I do not have it with me?
Yes. The 4400 has a directional code entered on the lock's keypad as backup access, so the padlock opens without a phone. If the lock's own battery dies while it is locked, a battery jump gives temporary access so you are not cutting it off. The lock also warns you before that point, with a low battery notification on the padlock itself and in the app.
2) Is the Master Lock 4400 Bluetooth padlock rated for outdoor or commercial gate use?
The 4400 is a residential-rated padlock. For a perimeter gate, a construction site, a utility cabinet, or anything exposed to weather and pry attack on a commercial property, step up to a boron or hardened steel shackle padlock built for outdoor commercial service. Where the 4400 earns its place is indoor and light-duty applications: lockers, storage rooms, tool cribs, cabinets, and shared-access points inside a managed building.
3) Which Master Lock Vault app do I need for the 4400 padlock if I am managing locks across a portfolio of buildings?
Two apps work with the 4400, and they are not the same product. Vault Home (iOS and Android, free) is the personal-use version and supports up to 10 locks with access history. Vault Enterprise (iOS, Android, plus a web interface, also free) is the business version, built for many locks and many users, with data and audit trails. A property manager running more than ten locks or more than one person's access wants Enterprise. A landlord with a handful of units can run Home.
4) Can I give a contractor temporary access to a Master Lock 4400 Bluetooth padlock without handing over a key?
That is the main reason to buy it. Access is shared through the Master Lock Vault system, temporary or permanent, from your phone. There is no physical key to hand over, lose, or have copied without your knowledge, and no combination to circulate. When the trade is done, the access goes away without anyone rekeying anything or collecting a key back.
5) Can I see who opened a Master Lock 4400 padlock and when?
Yes, and the depth depends on which app you run it under. Vault Home shows access history for personal use. Vault Enterprise carries data and audit trails, which is what a facility or MRO buyer needs when access to a room or cabinet has to be evidenced later. Either way the record is per lock, tied to the user who opened it, rather than to a key that anyone holding it could have used.
6) What battery does the Master Lock 4400 Bluetooth padlock take and can I replace it myself?
It runs on a CR2450 coin cell, supplied with the lock, and it is user replaceable. That is an off-the-shelf cell you can stock by the sleeve, which matters if you are running a fleet of these across a property and want one battery on the shelf rather than a service call.
7) Will the Master Lock 4400 padlock work inside a locker where my phone is on the outside?
Yes. Vault Home includes a Locker Mode setting specifically for storage inside a locker, so the lock behaves correctly when the phone and the lock are separated by the locker door. This is the setting institutional buyers want for school, gym, and staff locker banks.
8) Is the Master Lock 4400 a keyed padlock or Bluetooth only?
The 4400 is listed as keyed, and it also opens by Bluetooth through the Master Lock Vault app or by a directional code on its keypad. So you have three ways in rather than being locked into the phone. If you are standardizing a property on one keying system, note this is a residential-grade lock, not a commercial keyway product.
9) How many Master Lock 4400 padlocks can one person manage on the free Vault Home app?
Ten. Vault Home is capped at 10 locks and is built around one person's personal use. Past that count, or as soon as more than one staff member needs to open the same lock, you move to Vault Enterprise, which handles many locks and many users through the app or a web interface at no cost either.
How fast can I get the Master Lock 4400D delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Master Lock 4400D come with a warranty?
Absolutely. The Master Lock 4400D is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Master Lock 4400D?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Master Lock 4400D from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.
