Last Updated on September 10, 2026
The best lock lubricant is a Teflon (PTFE) dry lube such as Tri-Flow. It frees the lock without attracting dust, so the cylinder keeps turning smoothly for years. Powdered graphite works on a clean lock but builds up and jams over time, and oil sprays like WD-40 are the worst choice for a lock because they collect grit and gum up the pins.
Locksmiths get asked this constantly, and most people reach for graphite or, worse, WD-40. Here is what actually keeps a lock working, what slowly destroys it, how to apply it, and which lube fits which lock.
The best lock lubricant: a Teflon (PTFE) dry lube
A PTFE-based dry lube like Tri-Flow goes on wet to carry into the lock, then dries to a slick film that does not hold dust. That is the key difference: it lubricates without turning into the sticky paste that traps grime. A quick shot once or twice a year keeps deadbolts, knobs, padlocks, and car locks turning cleanly. Amazon carries Tri-Flow and several other PTFE lubricants. Other good options our techs use include Houdini, also available on Amazon, plus Lock-Saver and DryFilm.
Is graphite good for locks?
Graphite is a dry lubricant and has worked in locks for decades. On a new or freshly cleaned lock it is fine. The problem is overuse: people add more every time the lock sticks, and the graphite plus dust eventually packs the cylinder and stops it turning. Graphite also soaks up any liquid, so if you later spray oil into a graphite-filled lock you create a paste. Use it sparingly, or use a PTFE dry lube instead.
What not to use: WD-40 and oil
WD-40 and other oils feel like they help because the lock loosens for a day, then the oil attracts dirt and the lock gets worse than before. Oil is a cleaner and water displacer, not a long-term lock lubricant. If your lock is already gummed up, flush it with an electrical or brake cleaner to strip the old residue, let it dry, then apply a PTFE dry lube.
Best lubricant by lock type
- Door deadbolts and knobs: a PTFE dry lube is the best lubricant for door locks, in the keyway and on the latch, once or twice a year.
- Padlocks, especially outdoors: PTFE dry lube; it sheds water better than oil and will not freeze or attract grit, which also makes it the best lock lubricant for cold weather.
- Car door and ignition locks: a dry lube only. Oil in an ignition collects dust and leads to a key that will not turn.
- High-traffic commercial locks: PTFE dry lube on a schedule; these see the most dust and wear.
- Garage and gate hardware: dry lube on the lock, a separate hinge or spring lubricant on moving steel.
Your climate changes what you should use
Where you live matters more than most lubricant guides admit. On the coast you are fighting salt air, which corrodes the pins and springs, so rust is the enemy. In freezing climates anything holding moisture will seize a cylinder solid on the first hard night.
In the Phoenix Valley we are fighting dust. We get it off the desert year round, and then monsoon season drives it into everything. It works its way into the keyway and settles down on the pins.
That is what makes WD-40 so bad here specifically. It does not dry and it does not wash out, so it holds every bit of grit right against the pins. You end up with a paste in there. That is the lock that gets a little harder to turn every month until one day the key will not turn at all, and the owner thinks the lock failed. It did not. It is packed with dust and oil.
The fix is the same either way: flush the old product out of the cylinder, let it dry, and go back to a dry lube that does not attract anything. That is why we put PTFE on our own customers’ locks across Phoenix, Mesa, Scottsdale, Gilbert, and the rest of the Valley.
How to lubricate a lock
- If the lock is sticky or full of old graphite or oil, spray a cleaner into the keyway first and work the key in and out to flush it, then let it dry.
- Insert the straw and apply a short burst of PTFE dry lube into the keyway.
- Work your key in and out a dozen times to spread it through the pins.
- Wipe the key and the face of the lock. Repeat once or twice a year.
When a lock needs more than lube
If a lock stays stiff after cleaning and lubing, the key is worn or the cylinder is failing, and lube only masks it. See lock repair, and if a key snapped off read how to remove a broken key. Installing new hardware? See lock installation.
