How to Prevent Lock Failures: Expert Maintenance & Security Tips

Here is the technical breakdown of how we maintain security hardware at Armstrong Locksmith in Nashville.

1. The "Right" Way to Lubricate (Stop Using WD-40)

In our daily calls across Nashville, the number one cause of seized locks is actually improper maintenance. Homeowners often spray standard oil-based lubricants (like regular WD-40) into the keyway. Over time, this oil collects dust and creates a sticky "gunk" that jams the bottom pins.

Our Pro Process:

• Use the Right Solvent: We exclusively use PTFE (Teflon) or silicone-based lubricants (brands like Tri-Flow or Houdini). These dry without leaving a sticky residue.
• The Technique: Spray a concise burst into the keyway. Insert your key and slide it in and out 5–10 times. Wipe the key clean. This distributes the lubricant across the shear line without flooding the mechanism.
• Graphite Caution: Graphite is great, but only if the lock is dry. If you add graphite to a lock that previously had oil in it, it turns into cement.

2. Identifying "Crunchy" Locks Before They Fail

Locks rarely fail without warning. They almost always give you tactile feedback first. If you have to jiggle the key, pull it back slightly to turn it, or apply upward pressure, your pin tumblers or the key ramp are worn out.

Neglecting "sticky" locks often leads to snapped key in a lock—a common emergency call we handle in Nashville.

When to Replace:

• Key Resistance: If the key feels "sticky" or "crunchy" when inserting.
• Loose Cylinder: If the entire lock cylinder spins or wiggles in the housing, the tailpiece or set screws are likely compromised.
• Visual Key Inspection: Look at your key. Are the "peaks" rounded off? Is there a hairline crack near the head? A snapped key in a lock is a much more expensive service call than a simple lock replacement.

3. The Heavy Keychain Myth (It’s Real)

We often see ignition failures in older vehicles caused by heavy keychains. While modern push-to-start fobs are immune to this, traditional keyed ignitions rely on delicate wafers.

A heavy keychain acts like a pendulum. Every time you hit a pothole on I-40, that weight drags down on the key, unevenly wearing the internal wafers. Eventually, the ignition lock cylinder collapses, and the key will no longer turn.

4. Upgrade to ANSI Grade 1 or 2 Hardware

Not all locks are created equal. The deadbolts you buy in a discount bin at a big-box store are often ANSI Grade 3—the lowest residential standard. They contain plastic internal components and weak strike plates.

For genuine security, we recommend upgrading to ANSI Grade 1 or 2.

• Hardened Steel Inserts: These prevent a thief from drilling through the cylinder.
• Reinforced Strike Plates: This attaches the lock to the frame of the house with 3-inch screws, making it significantly harder to kick in the door.

5. Winterizing Outdoor Locks

Nashville winters can fluctuate wildly. Moisture gets into padlocks or exterior gate locks, and when the temperature drops, that moisture freezes, seizing the shackle.

Outdoor Protection Protocol:

• Shutter Guards: Use padlocks that have a flap covering the keyway.
• De-Icing: If a lock is frozen, do not use a lighter (this can melt internal plastic parts or damage electronic smart lock circuits). Use a dedicated lock de-icer or hand sanitizer (the alcohol melts the ice).

Written by Rahim Ezzadpanah

Owner of Armstrong Locksmith

Rahim has over 18 years of experience in the locksmith field, specializing in commercial access control and high-security residential hardware.