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Master Lock 1654-0320 Locker Lock Extension Set for 11/16" to 3/4" Thick Doors
The Master Lock 1654-0320 Locker Lock Extension Set is a commercial-grade replacement part engineered to extend the compatibility of built-in combination locks on horizontal latch box lockers hinged on the right. Designed specifically for doors measuring 11/16" to 3/4" thick, this extension set ensures secure, properly fitted lock operation for locker installations where standard fitment is insufficient. As a purpose-built accessory for built-in combination lock systems, the 1654-0320 delivers a reliable, OEM-quality fit for demanding commercial environments.
Key Features
- Door Thickness Compatibility: Designed for locker doors measuring 11/16" to 3/4" thick, ensuring a precise and secure fit for the target door profile.
- Application-Specific Design: Engineered for horizontal latch box lockers with doors hinged on the right, providing proper alignment and smooth lock engagement.
- Built-In Combination Lock Compatibility: Functions as a direct extension accessory for Master Lock built-in combination lock systems, maintaining lock integrity and security.
- Commercial-Grade Construction: Rated for commercial use, making it suitable for high-traffic locker installations in demanding institutional and facility environments.
- OEM Replacement Part: Sourced as a genuine service part, ensuring compatibility and performance consistent with original manufacturer specifications.
- Service Parts and Cylinders Category: Classified under service parts and cylinders, supporting ongoing maintenance and lifecycle management of locker lock systems.
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: Miscellaneous Hardware
- Parts and Accessories Type: Replacement Parts
- Commercial/Residential: Commercial
- Product Model: 1654-0320
- Features: Service Parts/Cylinders and Keys
Typical Applications
- Educational Facilities and School Locker Rooms
- Commercial Office and Workplace Locker Installations
- Healthcare and Hospital Staff Locker Areas
- Fitness Centers and Athletic Facilities
- Industrial and Manufacturing Facility Locker Banks
- Government and Municipal Building Lockers
- Multi-Tenant Residential and Apartment Common Areas
Why Master Lock 1654-0320?
Master Lock's 1654-0320 Extension Set is purpose-designed for precise fitment on horizontal latch box lockers with built-in combination locks, delivering genuine OEM reliability for commercial locker maintenance programs. Engineered for doors 11/16" to 3/4" thick and hinged-right configurations, this replacement part supports consistent security performance across high-traffic institutional locker installations where dependable hardware is essential.
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:
- Miscellaneous Hardware
- Parts and Accessories Type:
- Replacement Parts
- Commercial/Residential:
- Commercial
- Product Model:
- 1654-0320
- Features:
- Service Parts/Cylinders and Keys
Master Lock 1654-0320 – Frequently Asked Questions
1) What door thickness does the Master Lock 1654-0320 locker lock extension set fit?
The 1654-0320 extension set is made for locker doors measuring 11/16 inch to 3/4 inch thick. If your locker doors are thinner than 11/16 inch, the built-in combination lock will already fit without an extension set, and this part is the wrong one to order.
2) Does the 1654-0320 extension set work on left-hinged locker doors?
No. The 1654-0320 is built for horizontal latch box lockers with doors hinged on the right. Handing matters on these extension sets, so a left-hinged bank of lockers needs the corresponding left-hand part, not this one. Check which way the doors swing before you order for a mixed locker room.
3) Does the 1654-0320 include the combination lock itself?
No. The 1654-0320 is an extension set only, a replacement accessory for a Master Lock built-in combination lock you already have on the locker. If the lock body itself is worn out or the combination has been lost beyond recovery, you need the built-in combination lock as well as, or instead of, this extension set.
4) What exactly is a locker lock extension set and why would I need one?
It is a service part that extends a built-in combination lock so it reaches and engages correctly through a thicker locker door. The lock body itself is sized for a standard door panel; when the panel runs 11/16 to 3/4 inch, the standard hardware does not reach the latch properly, and the extension set makes up that difference. You are not buying a lock here, you are buying the parts that adapt an existing built-in combination lock to a thicker door.
5) Is the Master Lock 1654-0320 a genuine Master Lock service part or an aftermarket copy?
It is a genuine Master Lock service part, sold under Master Lock part number 1654-0320, so it matches the fit and function of the original built-in combination lock hardware. For a facility running a standardized locker lock program, that matters: mixing aftermarket internals into a keyed or control-key locker system is how you end up with locks that bind or will not reset.
6) I manage a building with mixed locker types. Will this fit vertical latch lockers?
No. The 1654-0320 is specified for horizontal latch box lockers. Box lockers with a vertical latch, or full-height single-tier lockers with a different latching arrangement, use different hardware. Identify the latch orientation and the hinge side on each bank before ordering quantities.
7) Will this hold up in a school or gym locker room?
Yes, the 1654-0320 is rated for commercial use and is intended for high-traffic locker installations, including school and athletic locker rooms, healthcare staff areas, industrial locker banks, and government buildings. It is not a residential-duty part.
How fast can I get the Master Lock 1654-0320 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 1654-0320 come with a warranty?
Absolutely. The Master Lock 1654-0320 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 1654-0320?
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 1654-0320 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.