Schlage B81 One-Sided Deadbolt
- No batteries required
- Made in Mexico
- Door measurements needed: backset, cross bore, thickness
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A mechanical Schlage deadbolt sold as a one-sided, non-keyed model with no batteries to replace. The listing omits nearly every spec, so measure your door and check the box details.
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ASIN: B004L1W56GModel: B81Category: Deadbolts
Overview
Schlage sells this as a one-sided, non-keyed deadbolt in matte black, a mechanical lock that needs no batteries. The seller asks you to measure the backset, cross bore and door thickness before buying to confirm fit.
A purely mechanical bolt with nothing to charge suits doors locked only from inside. The listing gives almost no specs on the bolt, finish or included hardware. Fit has to be checked against your own door.
Who it's for
Back doors, side doors and interior entries that only lock from the inside suit a one-sided bolt. Front doors used from outside need a keyed deadbolt.
Pros and cons
- No batteries to replace
- Fully mechanical operation
- Known lock brand
- Backset and bolt specs not listed
- Cannot be opened from outside
Performance notes
A thumbturn throws the bolt from the inside only, so there is no outside cylinder to tamper with. Fit depends on matching the door's backset, bore and thickness. Alignment of the strike decides how smoothly the bolt throws.
Specifications
| Brand | Schlage |
|---|---|
| Model | B81 |
| Lock Type | Deadbolt, one sided |
| Color | Matte Black |
| Power Source | None, no batteries required |
| Country Of Origin | Mexico |
Frequently asked questions
How do I keep this Schlage deadbolt throwing smoothly?
The listing gives no care steps. It does stress measuring the door's backset, cross bore and thickness so the lock fits correctly.
Does this Schlage deadbolt need batteries?
No batteries are required.
Can I unlock it from outside?
It is sold as a non-keyed one-sided deadbolt, so it is operated from the inside only.
Where is it made?
Mexico.