Quick answer
Salt air corrodes plated lock finishes and the pins inside the cylinder, which is why keys stick and deadbolts bind on homes near the coast in Ocean Beach, Point Loma, Mission Beach, Pacific Beach and La Jolla. Choose solid brass, marine-grade stainless steel or PVD-coated hardware, keep the cylinder lubricated with a dry lubricant instead of oil, rinse exterior hardware occasionally, and replace pitted locks rather than rekeying them. See lock replacement and rekeying.
In this guide
What salt air does to a lock
Ocean air carries salt and moisture that settle on every exterior surface. On a plated lock, the thin decorative layer pits and flakes, then the base metal underneath corrodes. Inside the cylinder, the same moisture reaches the springs and pins; corrosion roughens them, they stop moving freely, and the key starts to stick. Eventually the bolt binds in a swollen strike or the mechanism seizes altogether. We see the whole cycle every week on cottages along Sunset Cliffs, the courts in Mission Beach and the beachfront blocks of Pacific Beach.
Hardware that survives the coast
- Solid brass. Brass corrodes into a patina rather than pitting through, and it keeps working. It's the traditional choice for a reason.
- Marine-grade stainless steel, ideally 316. The best material for hardware within sight of the water.
- PVD finishes. A physical vapor deposition coating bonds to the metal and resists salt far better than conventional plating. Ask for it by name.
- Sealed cylinders and weather-rated smart locks. Look for a gasket between the exterior housing and the door.
- Avoid: bright plated finishes on cheap builder-grade locks. They look fine in the box and pit within a year at the beach.
Five-minute maintenance that matters
-
1
Rinse and wipe
Every couple of months, wipe exterior hardware with a damp cloth and dry it. You're removing the salt film before it works in.
-
2
Dry lubricant in the keyway
A puff of dry PTFE or graphite lubricant into the cylinder twice a year. Never oil or all-purpose spray, which trap grit and gum up the pins.
-
3
Work the lock
Turn the key both ways a few times after lubricating. Locks that sit unused seize fastest.
-
4
Check the strike and bolt
If the deadbolt needs a shove to throw, the strike has shifted or the door has swelled. Fix it before the lock strains.
Rekey or replace a salty lock
A sticking lock near the beach can sometimes be cleaned, lubricated and rekeyed back to smooth operation. If the cylinder is visibly pitted, the finish is flaking or the bolt binds, replacement with coastal-rated hardware is the better spend, because the corrosion will keep going. We tell you honestly which one you're looking at on the phone or at the door. The rekey vs replace guide covers the general rule.
Vacation rentals and smart locks near the water
Rental owners in Ocean Beach and Mission Beach get hit twice: salt air plus constant use. A weather-rated keypad deadbolt in a stainless or PVD finish, with physical buttons rather than a touch panel, is the combination that lasts. Our smart locks for beach rentals guide goes deeper, and our property manager services cover the ongoing maintenance.
Written by Mark Hanna, owner and lead locksmith of Action Locksmith San Diego (CA LCO License #7199). Published , last updated . Prices mentioned are typical San Diego ranges; see the prices page for details.
