Brass or Stainless: What to Put on a Door Near the Ocean

Buying a lock, you are steered toward brand, security grade and how it looks. All three matter. But on the western half of this city the variable that decides how long it lasts is none of them: it is what the working parts are made of and how the outside is finished.

A well-known lock in plated brass and a mid-price lock in marine-grade stainless will both open your door tomorrow. Six years from now, on a street-facing door in the Sunset, one of them will be in a bin and the other will still be turning.

So the useful question at the counter is not which brand, it is what the finish is rated for. If the answer is a plating over brass, you are buying a consumable and you should know that going in.

Marine-grade stainless hardware typically runs somewhere between a third and double the price of the plated equivalent, depending on the item. On a single cylinder that is a modest difference. On a whole lock it is more noticeable.

Set against that: a replacement cylinder is $28 to $46 and a full replacement is $125 to $319, and near the beach the brass version invites that conversation every four to six years. Two replacements inside a decade is the realistic comparison, and once you count the second one the stainless is the cheaper choice rather than the indulgent one.

There is also the cost you cannot invoice: the lockout. Hardware that fails on its own schedule tends to fail at the least convenient moment, and a $135 to $249 emergency call at eleven at night is part of the true price of the cheaper lock.

Street-facing doors within roughly a mile of the ocean: yes. That covers most of the Sunset, the Richmond, Parkside and everything down toward Ocean Beach, plus Pacifica over the county line, where the exposure is the worst in our service area.

Anything that lives outdoors anywhere: padlocks on gates and grilles, driveway gate locks, a lock on an outside store. These take weather all year even on the sunny side of the city.

Interior doors: no, and nobody should try to sell it to you for one. Bedroom, office and stockroom locks are not exposed and stainless there is money spent for nothing.

East of the ridge — the Mission, Noe Valley, Bernal, Potrero — plated brass runs ten to fifteen years on a street-facing door and the extra spend stops paying for itself. Buy it if you want it, but it is a preference and not advice.

The Marina, Cow Hollow and Pacific Heights sit between the two. Bay air is gentler than ocean air, so a cylinder there does six to ten years, and the honest answer depends on how close to the water you are and whether the door faces it.

If you are unsure which category your door is in, ask before anything is fitted. Any locksmith worth calling can tell you from the street and the aspect, and one who recommends stainless for every door in the city is selling rather than advising.