Master Lock K1CM Master Key fo...
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Master Lock K1CM Master Key for 1MK New System Setup

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Model: K1CM

In Stock (leaves warehouse same day if ordered before 3pm ET)

$24.89
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Master Lock K1CM Master Key for 1MK New System Setup

The Master Lock K1CM is a purpose-built master key designed for use with the 1MK lock series, specifically intended for establishing a new master key system. Engineered for commercial applications, this replacement key component provides the access control foundation needed when configuring a fresh keying system, ensuring compatibility and reliable operation within the 1MK lock family. Ideal for facilities managers, security professionals, and locksmiths setting up or expanding a Master Lock keying program.

Key Features

  • New System Configuration: Specifically designed for new master key system setups, providing the correct key blank and cut profile for the 1MK lock series.
  • Master Key Functionality: Operates as the master key within a keying hierarchy, enabling top-level access across locks in the 1MK system.
  • Commercial-Grade Quality: Manufactured to commercial standards for dependable, long-term performance in professional security applications.
  • Replacement Parts Availability: Available as a service part for cylinders and keys, ensuring system continuity and simplified maintenance for existing Master Lock installations.
  • Precise Compatibility: Engineered for direct compatibility with the Master Lock 1MK lock series to ensure correct fit and function without modification.

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: Keys
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: K1CM
  • Features: Service Parts/Cylinders and Keys

Typical Applications

  • Commercial Office Buildings Requiring Master Key Access Control
  • Educational Facilities Establishing New Keying Systems
  • Healthcare Institutions Configuring Multi-Level Access Programs
  • Retail Establishments Setting Up Master Key Hierarchies
  • Industrial and Warehouse Facilities with Centralized Key Management
  • Multi-Tenant Residential Properties Requiring Master Access
  • Government and Municipal Buildings with Keyed-Alike or Master Key Requirements

Why Master Lock K1CM?

Master Lock delivers commercial-grade reliability in every service part, and the K1CM master key is no exception. Designed specifically for the 1MK lock series and new system configurations, it ensures precise compatibility and consistent performance for security professionals and facility managers who depend on accurate, long-lasting keying solutions.

Manufacturer Resources

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Keys
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
K1CM
Features:
Service Parts/Cylinders and Keys

Master Lock K1CM – Frequently Asked Questions

1) What is the Master Lock K1CM key used for?
The K1CM is the master key for Master Lock's 1MK lock series, supplied for setting up a new master key system. It sits at the top of the keying hierarchy, so it operates the locks under it in that 1MK system. It ships as a service part under cylinders and keys, which is how you also get it later for system continuity.
2) Will the K1CM master key work with locks other than the Master Lock 1MK series?
No. The K1CM is cut to the 1MK series key profile and is meant for that family only. If your cylinders are another Master Lock line or another brand's keyway, this key will not turn them. Match the key to the keyway stamped on your cylinders before ordering.
3) I already have a 1MK master key system running. Is the K1CM the right key to order?
The K1CM is specified for NEW master key system setup on the 1MK series, not for adding a key to an existing keyed system. If you are extending or duplicating on a system already in service, you need the key that matches your existing cuts, not a new-system master. Order the K1CM when you are establishing the hierarchy from scratch.
4) What is the difference between the Master Lock K1CM master key and a key blank like the Kaba Ilco CH1C?
The Master Lock K1CM is a cut master key for the Master Lock 1MK lock series, supplied ready to operate as the top-level key in a new master key system. The Kaba Ilco CH1C is a key blank for the Arrow 1C keyway in nickel silver construction, meaning it arrives uncut and has to be cut on a machine to a specific bitting before it will turn anything. If you need a working master key out of the package for 1MK locks, the K1CM is the cut key; if you are originating your own cuts on an Arrow 1C keyway, the CH1C is the blank.
5) Can I use a BEST 1A3A2KS531KS681 key in place of the Master Lock K1CM?
No. The BEST 1A3A2KS531KS681 is an operating key cut for a BEST green core in the A keyway, and it is supplied as a cut key. The Master Lock K1CM is cut for the Master Lock 1MK lock series and functions as the master key in that hierarchy. The two are on different keyways and different lock platforms, so neither will enter the other's cylinder. Order the K1CM for 1MK locks and the BEST cut key for BEST A keyway cores.
6) Do I need anything besides the K1CM to set up a master key system on 1MK locks?
The K1CM covers the master key side only. You still need the 1MK cylinders or locks themselves and the operating (change) keys for each individual opening; the master key gives top-level access across them, it does not key the locks by itself. It is catalogued as a replacement/service part, so it is also the item to reorder if the master key is lost or worn.
7) What are my options if my cylinders are BEST or Arrow rather than Master Lock 1MK?
You would order to that keyway instead. For a BEST small format interchangeable core in the A keyway there is the BEST 1A3A2KS531KS681 operating key for green core, and the BEST 1AF patented blank for preferred keyway work. For Arrow 1C, the Kaba Ilco CH1C nickel silver blank is the match. The Master Lock K1CM only serves 1MK cylinders.
8) Is the K1CM something a locksmith cuts, or does it ship ready to use?
The Master Lock K1CM ships as a service part for cylinders and keys with the correct blank and cut profile for the 1MK lock series, so it does not require a machine to be made usable in that system. That is the distinction from stock blanks such as the Kaba Ilco CH1C for the Arrow 1C keyway or the BEST 1AF patented blank, both of which are catalogued as key blanks and must be bitted before they will operate a cylinder.
9) We want a patent-protected key so copies cannot be made at a hardware store. Is the K1CM that, or is there an alternative?
The Master Lock K1CM is a commercial-grade master key built for the 1MK lock series and for setting up a new master key system. If restricted key duplication is the driving requirement for your facility, the BEST 1AF Series Preferred Patented Blank Key is a patented blank, and patented blanks are controlled at the blank level rather than duplicated from open stock. Note that moving to the BEST 1AF platform means the cylinders themselves must be BEST, not Master Lock 1MK, so it is a system decision rather than a key swap.
10) I need extra keys for an existing master key system, not a new one. Is the K1CM the right part?
The Master Lock K1CM is specified for new master key system setup on the 1MK lock series, supplying the correct key blank and cut profile for originating that system. If what you actually need is an operating key for an already-established system, that is a cut key made to the existing bitting, the way the BEST 1A3A2KS531KS681 is a cut operating key for a specific green core in the A keyway. For 1MK locks, confirm your system code before ordering so the key matches the hierarchy already in the doors.
11) Is this key rated for commercial buildings or is it a residential product?
Commercial. The K1CM is built as a commercial service part for door hardware, and it is the sort of key used where a facility runs a central master program: offices, schools, healthcare, retail, warehouses, multi-tenant residential and municipal buildings.
12) How many versions of the Master Lock K1CM are there to pick from?
Just one. K1CM is a single model with no finish, keyway or length choices to specify, so the only thing to confirm is that your locks are the Master Lock 1MK series.
How fast can I get the Master Lock K1CM 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 K1CM come with a warranty?
Absolutely. The Master Lock K1CM 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 K1CM?
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 K1CM 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.
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