Lock Installation & Maintenance Flashcards

What is the recommended door preparation bore size for a standard US cylindrical lockset?

Answer: 2-1/8 inches

The standard cross-bore hole for a cylindrical lockset in the US is 2-1/8 inches in diameter to accommodate the lock body.

Which ANSI/BHMA grade designation indicates the highest-quality commercial-grade lockset?

Answer: Grade 1

ANSI/BHMA Grade 1 is the highest designation, indicating heavy-duty commercial quality with the most rigorous cycle and security testing.

A deadbolt throw (bolt projection) should be a minimum of how much to meet typical security standards?

Answer: 1 inch

A deadbolt should have a minimum 1-inch throw (bolt projection) to adequately engage the door frame and resist kick-in attacks.

When a lock cylinder is stiff and difficult to turn with the correct key, what maintenance step should be performed FIRST?

Answer: Clean and lubricate the cylinder

Cleaning and lubricating the cylinder is the first maintenance step when a lock is stiff, as dirt and dried lubricant are common causes of binding.

In a high-security door frame installation, which reinforcement product is used to prevent door frame kick-in?

Answer: Strike plate with 3-inch screws and door jamb reinforcement

A reinforced strike plate secured with 3-inch screws that reach the wall studs, combined with a door jamb reinforcement kit, prevents frame kick-in.

What is the purpose of a 'handing' specification when ordering a lockset?

Answer: Specifies which side of the door the handle is on and which way the door swings

Handing identifies whether a door is left-hand or right-hand swing and which face is exterior, ensuring the lockset is configured for proper installation.

When installing a padlock hasp, where should the screws be positioned relative to the hasp body when closed?

Answer: Concealed under the hasp body when the hasp is closed

Hasp screws must be concealed under the closed hasp body to prevent an intruder from removing the screws to defeat the lock.