Types of Locks: A Complete Guide to Lock Mechanisms

Most locks fall into eight types: pin tumbler, wafer, dimple, tubular, disc detainer, lever, padlock, and smart locks. Each resists opening with a different internal mechanism, and each calls for a different picking approach. This guide explains how every type works, where you will run into it, and how the eight compare on security.

Last updated: May 2026

Reviewed by

Chris Dangerfield

Founder, LockPickWorld. 20+ years in locksport.

Founder of LockPickWorld since 2007. Chris has spent two decades working with locks of every mechanism on this page, and reviews this guide alongside the LockPickWorld locksport team.

Reviewed: 2026-05-22

The eight mechanisms below cover almost every lock you will meet from one day to the next. Each entry explains how the lock works, where it shows up, how secure it is, and how pickers approach it.

1. Pin tumbler locks

Labeled cross-section diagram of a pin tumbler lock showing key pins, driver pins, springs, the plug, the housing, and the shear line — Cross-section of a pin tumbler lock: the key lifts each pin pair so the gap between key pin and driver pin meets the shear line.

A pin tumbler lock holds its plug in place with stacked pin pairs: a key pin that the key touches, and a spring-loaded driver pin above it. The correct key lifts every pair until the gap between the two pins lines up with the shear line, the seam where the plug meets the housing. The plug is then free to turn. Linus Yale Jr. patented the modern version in 1861, and it is still the most common lock on earth.

Where you will see it: Residential deadbolts, door knobs, most padlocks, and the bulk of commercial door hardware.
Security rating: 2 / 5
How to pick it: Single pin picking or raking with a standard pick and a tension wrench. This is the mechanism nearly every beginner learns on.
Recommended picks: Lock pick sets

2. Wafer locks

Labeled cross-section diagram of a wafer lock showing spring-loaded wafers, the plug, and the housing — Cross-section of a wafer lock: spring-loaded wafers block the plug until the key pulls them flush.

A wafer lock swaps the pin stacks for single flat wafers, each pushed by a spring so it juts into a slot in the housing and blocks the plug. The correct key pulls every wafer back flush with the plug so it can rotate. Wafers are cheap and quick to manufacture, which is why the mechanism turns up wherever cost matters more than security. Early versions date to Philo Felter's 1868 patent.

Where you will see it: Car doors and ignitions, filing cabinets, lockers, desk drawers, and inexpensive padlocks.
Security rating: 1 / 5
How to pick it: Pick or rake it like a pin tumbler, or use a wafer jiggler, a tool that combines tension and raking in a single piece.
Recommended picks: Lock pick sets

3. Dimple locks

Labeled cross-section diagram of a dimple lock showing pins meeting the dimpled flat face of the key — Cross-section of a dimple lock: pins meet the dimpled pockets on the flat face of the key.

A dimple lock is a pin tumbler in a different orientation. Instead of a toothed edge, the key has dimpled pockets milled into its flat faces, and the pins press against those faces from the side or underneath. Dimple locks often carry more pins than a standard cylinder and machine them to tighter tolerances, which makes the mechanism noticeably harder to pick.

Where you will see it: European front doors, higher-security padlocks, and many euro-profile cylinders.
Security rating: 3 / 5
How to pick it: Single pin picking with dedicated dimple picks, which are shaped to reach pins on the flat of the keyway rather than the edge.
Recommended picks: Dimple lock picks

4. Tubular locks

Labeled cross-section diagram of a tubular lock showing pins arranged in a circle around a central post — Cross-section of a tubular lock: pins sit in a ring around a central post.

A tubular lock arranges its pins in a ring around a central post and reads them with a cylindrical key. All of the pins, usually seven or eight, must reach their shear point together. The circular layout shrugs off ordinary picks, but it is also highly predictable, so a tool built to match the geometry can open and even decode the lock quickly.

Where you will see it: Vending machines, bike locks, gun cases, alarm panels, and display cabinets.
Security rating: 3 / 5
How to pick it: A tubular lock pick tensions and works all the pins at once. Many models also decode the cut depths so you can cut a working key.
Recommended picks: Tubular lock picks

5. Disc detainer locks

Labeled cross-section diagram of a disc detainer lock showing rotating discs, the sidebar, and the core — Cross-section of a disc detainer lock: rotating discs align their slots so the sidebar can drop in.

A disc detainer lock uses rotating discs in place of spring-loaded pins. The key turns each disc to a precise angle until a slot in every disc lines up and a sidebar drops into the channel, releasing the core. With no springs to corrode or freeze, the mechanism thrives outdoors. Emil Henriksson invented it in 1907, and Abloy still makes the best-known examples.

Where you will see it: High-security padlocks, bike locks, utility cabinets, and outdoor installations.
Security rating: 4 / 5
How to pick it: A specialist disc detainer pick tensions the core and rotates each disc on its own. Quality locks add false gates that make this slow and demanding.
Recommended picks: Disc detainer pick

6. Lever locks

Labeled cross-section diagram of a lever lock showing stacked levers, gates, the bolt, and the curtain — Cross-section of a lever lock: the key lifts each lever so its gate aligns and frees the bolt.

A lever lock stacks pivoting levers, each with a gate cut into it. The bolt is trapped until the key raises every lever to the one height that aligns all the gates and lets the bolt slide. Robert Barron patented a double-acting lever lock in 1778. The mechanism still guards doors, safes, and older padlocks across the UK and Europe, often as the backup behind a euro cylinder.

Where you will see it: UK internal and external doors, safes, and older padlocks.
Security rating: 3 / 5
How to pick it: A two-in-one lever pick or a curtain pick applies tension and lifts each lever. Insurance-rated locks fight back with false gates and a rotating curtain.
Recommended picks: Lock pick sets

7. Padlocks

Labeled cutaway diagram of a padlock showing the shackle, the locking mechanism, and the core — Cutaway of a padlock: shackle, springs, and the locking core inside the body.

A padlock is a form factor rather than a mechanism. It is a portable, self-contained lock with a shackle, and inside it can run any core covered on this page: pin tumbler, wafer, disc detainer, or a combination dial. A padlock's security therefore depends on two separate things: the strength of that internal mechanism, and how well the shackle and body resist cutting, prying, and shimming.

Where you will see it: Gates, sheds, storage units, lockers, gym bags, and toolboxes.
Security rating: Varies by core
How to pick it: Pick the core exactly as you would its mechanism type. Many budget padlocks are also open to shimming, where a thin shim releases the shackle directly.
Recommended picks: Lock pick sets

8. Smart locks

Labeled diagram of a smart lock showing the keypad, electronic control module, motor, and mechanical backup cylinder — Diagram of a smart lock: keypad or app credential, electronic module, motor, and the mechanical backup cylinder.

A smart lock replaces or supplements the key with electronic credentials: a keypad code, a phone app, Bluetooth, Wi-Fi, RFID, or a fingerprint. Most models still hide a physical cylinder for backup, so a smart lock is only as strong as the weakest of three things: its software, its wireless link, and that mechanical fallback. The convenience is real, and so is the larger attack surface.

Where you will see it: Modern front doors, short-term rentals, offices, and apartment buildings.
Security rating: 3 / 5
How to pick it: Smart locks are not a lockpicking target. The practical weak points are the mechanical backup cylinder or a flaw in the firmware or wireless, not the keyway.

How the eight lock types compare

A quick reference for the eight mechanisms above. Security is rated from 1 (weakest) to 5 (strongest) for a typical example of each type. Build quality varies widely inside every category.

Lock type	Common use	Security (1 to 5)	Best pick tool
Pin tumbler	Homes, doors, most padlocks	2 / 5 - easy to learn on	Standard lock pick set
Wafer	Cars, cabinets, lockers	1 / 5 - easiest to pick	Pick set or wafer jiggler
Dimple	Euro doors, security padlocks	3 / 5 - moderate	Dimple lock pick set
Tubular	Vending machines, bike locks	3 / 5 - needs the right tool	Tubular lock pick
Disc detainer	High-security padlocks, bikes	4 / 5 - hard, specialist only	Disc detainer pick
Lever	UK doors, safes, old padlocks	3 / 5 - moderate	Two-in-one or curtain lever pick
Padlock	Gates, sheds, lockers, tools	Varies by core	Matches the core mechanism
Smart lock	Modern doors, rentals, offices	Not a picking target	Not applicable (electronic)

Ratings describe typical consumer-grade locks. A high-security version of any mechanism outperforms a budget one. Pickability notes are a guide for locksport practice, not a security endorsement.

Which type of lock is the most secure?

For everyday use, the disc detainer lock is the most secure mechanism on this list. The best examples, from makers like Abloy, combine false gates, hardened steel, and tight tolerances that defeat all but specialist tools and very experienced pickers. A well-managed smart lock can match that in practice. For a standard door, the strongest practical choice is a dimple or pin tumbler deadbolt fitted with spool and serrated security pins and backed by an independent grade rating.

Which type of lock is the easiest to pick?

The wafer lock is the easiest common mechanism to open. Its single flat wafers and loose tolerances give way to simple raking, or to a wafer jiggler, in seconds. Basic pin tumbler locks without security pins are the next easiest, which is why a clear pin tumbler practice lock is what most people learn on first.

Frequently asked questions about lock types

What is the most common type of lock?

The pin tumbler lock is by far the most common. It secures the majority of residential deadbolts, door knobs, and padlocks worldwide. Linus Yale Jr. patented the modern design in 1861, and most keys you carry today operate a pin tumbler mechanism.

What type of lock is the hardest to pick?

Among common mechanisms, a quality disc detainer lock is the hardest to pick. Top examples from makers like Abloy use false gates and tight tolerances that defeat all but specialist tools and experienced pickers. High-end dimple and lever locks with security features are close behind.

What is the difference between a wafer lock and a pin tumbler lock?

Both block a rotating plug, but a pin tumbler uses stacked spring-loaded pin pairs while a wafer lock uses single flat wafers. Wafer locks are cheaper, faster to make, and far easier to pick. Pin tumbler locks offer more security and accept upgrades like spool and serrated security pins.

What kind of lock is best for a front door?

A front door is best served by a quality pin tumbler or dimple deadbolt with security pins, ideally one carrying an independent grade rating. Many homeowners add a smart lock for convenience and access logs. Whatever the mechanism, fit matters: a good lock in a weak door or strike plate is still weak.

Are smart locks more secure than traditional locks?

Not automatically. A smart lock adds convenience, remote access, and an audit trail, but it also adds an attack surface across its firmware, wireless connection, and app. Most smart locks keep a mechanical backup cylinder, so they are only as strong as that fallback. Managed well they are a solid layer; managed poorly they are not.

How can I tell what type of lock I have?

Look at the key. A toothed edge means a pin tumbler or wafer lock. Dimpled pockets on a flat key mean a dimple lock. A round key with notches around a tube means a tubular lock. A long flat key with a single bit usually means a lever lock. No key at all, just a keypad or app, means a smart lock.

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