Lock Boxes · Master Lock
Master Lock 5400D Portable Lock Box
3.5/5 Best Safe Score (how we score)
The set-your-own-combination over-the-knob box real estate agents use: a 4-digit dial code you choose, a weather cover over the dials and a vinyl-coated shackle that will not scratch the knob.
Details
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Who it's for
- Best classic doorknob box in Best Key Lock Box – 3 Picks for Spare Keys and Guest Codes: A homeowner or renter who wants a portable, no-battery spare key for family or a house sitter that can come along in a move; owners report thin casing, so keep it to a spare key, not master keys.
What we like
- Set-your-own 4-digit combination and no batteries
- Sliding weather cover protects the dials; large cavity avoids jamming with several keys
- Portable shackle fits behind most doorknobs and is easy to take when you move
What to know first
- Some owners report the casing can be smashed open and that it is not fully weatherproof long term
Product details
| Brand | Master Lock |
|---|---|
| Manufacturer | Master Lock |
| Model | 5400D |
| Part number | 5400EC |
| Dimensions (L x W x H) | 1.5 inches x 3.25 inches x 6.25 inches |
| Item weight | 1 pounds |
| Color | Black |
| Size | 1 Pack |
| Warranty | Limited Lifetime Warranty |
| Code type | Set-your-own 4-digit dial combination (Master Lock) |
| Resettable code | Yes, owner-set 4-digit combination |
| Mounting | Portable over-the-knob vinyl-coated shackle only; the wall-mount sibling is the 5401D |
| Capacity | Large internal cavity for multiple keys (Master Lock); one owner fit about 5 house keys and access cards |
| Dimensions | 6-1/4 x 3-1/4 x 1-1/2 in exterior, H x W x D (Master Lock) |
| Weight | 1.16 lb (Master Lock) |
| Shackle | 1-13/32 in long, 1-7/8 in wide, 13/32 in diameter (Master Lock) |
| Weather | Maker lists it as weather resistant with a cover over the dials; no IP rating published |
| Power | None (mechanical) |
Top rows from the Amazon listing; the rest from the maker pages we checked.
About this item
- SPARE KEY STORAGE: This durable key lock box holds up to 5 standard house keys in one locked spot, giving family, renters, and trusted helpers controlled access without hidden spares
- WEATHERPROOF OUTDOOR KEY SAFE: A solid metal body and protective shutter door shield the dials from rain, dust, and daily exposure. A reliable way to hide a key outside, built for year-round use
- RESETTABLE COMBINATION LOCK BOX: Set your own 4-digit code and reset it anytime, with no keys to copy or locks to replace. Thousands of code options give flexible access for guests, contractors, and cleaners
- COMPACT, PORTABLE, AND DAMAGE-FREE: Hangs over most ball, biscuit, and tulip-style door knobs, plus gates, fences, and select mailboxes. The vinyl-coated shackle installs in seconds without scratching surfaces
- BUILT FOR REALTORS, RENTALS, AND HOMEOWNERS: A reliable realtor lock box for property showings, also used by Airbnb hosts, vacation rental owners, and families managing house key storage for caregivers
From the product's Amazon listing, as of Nov 7, 2026, 7:59 PM UTC. The seller writes this text, not us, and Amazon may change it.
What owners say
Summarized from 1 owner discussion and review page we read.
Praise
- Easy to open and easy to change to a code the family remembers
- Sturdy metal feel and generous key space for a spare key or house sitter
Complaints
- Thin casing that a burglar smashed open (owner report)
- Not waterproof long term and the vinyl coating can go tacky
