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Schlage B520-721 Back Housing, For Use With 1-1/8" Modular Mortise Cylinder
Manufacturer Resources
Product Specs
- Product Group:
- Mechanical Locks
- Subcategory:
- Parts and Accessories
- Product Subgroup:
- Parts and Accessories
- Product Type:
- Cylinder Housing
- Commercial/Residential:
- Commercial
- Product Model:
- B520-721
- Product Category:
- Mechanical Locks
- Department:
- Door Hardware
Schlage B520721 – Frequently Asked Questions
1) What is the Schlage B520-721 back housing actually for?
It is the back housing component for a Schlage 1-1/8 inch modular mortise cylinder. The modular cylinder is built in sections, and the back housing is the rear body the plug and cam assembly seats into. It is a replacement or build-up part for the cylinder itself, not a complete keyed cylinder and not a lock.
2) Will the B520-721 housing work with a 1-1/4 inch or longer mortise cylinder?
No. The B520-721 is sized for the 1-1/8 inch modular mortise cylinder only. Mortise cylinder length has to match the door thickness and trim projection so the cam engages the lock case properly, so if your opening takes a longer cylinder you need the housing for that length, not this one.
3) Does the B520-721 come keyed, with a plug and key included?
No. The B520-721 is the back housing only. To end up with a working mortise cylinder you still need the cylinder plug, cam, and keying to your keyway, plus the set screw and trim ring arrangement your lock requires. Order it as a component, not as a finished cylinder.
4) How do I make sure I am ordering the right Schlage cylinder housing?
Order by the model, B520-721, and confirm the modular mortise cylinder you are building or repairing is the 1-1/8 inch size. Schlage's B520 housings are split by cylinder length, so the length is the spec that decides it, not the finish or the keyway.
5) Is the Schlage B520-721 rated for commercial door hardware use?
Yes, it is a commercial-duty part, sold as a component of Schlage's mortise cylinder line rather than a residential accessory. Typical use is a locksmith or facility shop rebuilding or standardizing mortise cylinders across a building.
How fast can I get the Schlage B520721 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 Schlage B520721 come with a warranty?
Absolutely. The Schlage B520721 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 Schlage B520721?
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 Schlage B520721 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.