A high-security lock is one built to resist the common ways locks are defeated (picking, bumping, drilling and forcing the cylinder) and, just as importantly, to stop unauthorized copies of its keys. For most businesses, the answer to what to install is not one product but a combination: high-security cylinders on the doors that matter most, solid commercial lock bodies to hold them, and reinforced doors and frames so the lock is not the weakest point.

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What Makes a Lock High-Security

  • Key control — keys on a restricted or patented keyway that cannot be bought as blanks or cut at a hardware kiosk. Copies are usually only made through an authorized dealer, often against a signature or ID card on file.
  • Pick and bump resistance — extra locking elements such as sidebars, rotating or angled pins, or secondary pins that a standard key or pick cannot set.
  • Drill and force resistance — hardened steel inserts or pins that protect the plug and shear line, and housings designed to resist pulling or wrenching.

There is a published standard for these products: ANSI/BHMA A156.30, which sets security performance requirements for mechanical and electrified high security cylinders and includes sections on key control, destructive tests and surreptitious entry resistance. Its tests are performed under laboratory conditions, so installation and maintenance still matter. When comparing products, ask which level or listing the cylinder has achieved rather than relying on marketing terms like "pick-proof".

What to Install, Door by Door

Main entrance and storefront

Glass and aluminum storefront doors usually take a narrow-stile deadlock with a mortise cylinder. Upgrading that cylinder to a high-security one is often the most effective single change, together with a cylinder guard or collar that makes the cylinder harder to grip and twist.

Rear and service doors

Back doors are attacked more often because they are out of sight. A heavy-duty commercial deadbolt or mortise lock with a high-security cylinder, a latch guard over the gap, and a properly anchored strike make a large difference. Many rear doors are also required exits, so any added lock must still let people leave freely from the inside; check before adding hardware. Our article on door frame reinforcement covers the frame side.

Interior high-value rooms

Server rooms, cash offices, records storage and stock cages benefit from high-security cylinders keyed separately from the general office keys, so that a lost staff key does not expose them.

Gates, cabinets and padlocks

Many high-security lines include padlocks with shrouded shackles, cam locks for cabinets and cylinders for roll-up doors, which lets one keyway cover everything that needs protecting.

The Lock Body Matters Too

A high-security cylinder installed in a light-duty lockset, or in a door with a weak frame, only moves the problem. For commercial doors, look for heavy-duty hardware with an ANSI/BHMA Grade 1 rating, where Grade 1 is the most demanding of the three grades. If bumping is your main concern, our guide to bump-proof locks explains that specific risk.

Key Control Is the Long-Term Benefit

The real value of a high-security system shows up years later. Because copies can only be made through an authorized channel, you know how many keys exist and who holds them. It also fits naturally with a master key system, so managers and staff can carry one restricted key each instead of a ring of copyable ones. Ask how long the keyway's patent or restriction runs, since patents eventually expire.

What Affects the Cost

The main factors are how many doors and cylinders you include, the level of the product line, whether existing locks can accept a new cylinder or must be replaced, door type (aluminum storefront, hollow metal or wood), the number of keys, and whether the cylinders are part of a master key system.

Next Step

Start by ranking your doors from most to least exposed. Our high-security locks page explains how we assess and upgrade commercial doors, or call (613) 707-4884 to discuss your building.