CPL Lock Installation & Maintenance 3 — Questions and Answers
Question 1: What is the recommended door preparation bore size for a standard US cylindrical lockset?
- 1-1/2 inches
- 2 inches
- 2-1/8 inches (Correct answer)
- 2-3/8 inches
Correct 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.
Question 2: Which ANSI/BHMA grade designation indicates the highest-quality commercial-grade lockset?
- Grade 1 (Correct answer)
- Grade 2
- Grade 3
- Grade 4
Correct answer: Grade 1
ANSI/BHMA Grade 1 is the highest designation, indicating heavy-duty commercial quality with the most rigorous cycle and security testing.
Question 3: A deadbolt throw (bolt projection) should be a minimum of how much to meet typical security standards?
- 1/2 inch
- 3/4 inch
- 1 inch (Correct answer)
- 1-1/2 inches
Correct 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.
Question 4: When a lock cylinder is stiff and difficult to turn with the correct key, what maintenance step should be performed FIRST?
- Replace the cylinder
- Rekey the lock
- Clean and lubricate the cylinder (Correct answer)
- Adjust the strike plate
Correct 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.
Question 5: In a high-security door frame installation, which reinforcement product is used to prevent door frame kick-in?
- Door barricade bar
- Strike plate with 3-inch screws and door jamb reinforcement (Correct answer)
- Surface bolt
- Floor stop
Correct 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.
Question 6: What is the purpose of a 'handing' specification when ordering a lockset?
- Indicates the finish color of the lock
- Specifies which side of the door the handle is on and which way the door swings (Correct answer)
- Defines the keyway profile
- Indicates the lock grade
Correct 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.
Question 7: When installing a padlock hasp, where should the screws be positioned relative to the hasp body when closed?
- Exposed on the outside for easy access
- Concealed under the hasp body when the hasp is closed (Correct answer)
- On the back of the door
- In the door frame only
Correct 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.
CPL Lock Installation & Maintenance 3
What is the recommended door preparation bore size for a standard US cylindrical lockset?