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Cylindrical Knob Locks
National Lock Supply offers a full line of Grade 1 and Grade 2 cylindrical Knobs for a variety of applications. We have a selection of functions and finishes to match architectural and decorative requirements.
Frequently Asked Questions
What is a cylindrical knob lock?
A cylindrical knob lock is a mechanical lock that installs through a 2-1/8″ bore and 1″ latch bore. At National Lock Supply, we offer knob locks for interior doors and light commercial applications.
How do knob locks differ from lever locks?
Knob locks require grasping and twisting, making them not ADA compliant. Lever locks are preferred for accessibility and heavy traffic.
What door prep is required?
Knob locks fit 1-3/8″ to 1-3/4″ thick doors, with backsets of 2-3/8″ or 2-3/4″, similar to lever locks and deadbolts.
What functions are available?
Common ANSI functions: Passage, Entry, Privacy, Classroom, and Storeroom.
What grades are offered?
Most knob locks are Grade 2 or 3. Grade 1 knob locks exist but are less common than Grade 1 lever locks.
Where are knob locks commonly used?
They are installed on bedrooms, bathrooms, closets, utility rooms, and some light commercial doors. For exterior doors, they are usually paired with deadbolts.
How secure are knob locks compared to other types?
Knob locks provide basic security, but they are easier to force than lever or mortise locks. For stronger exterior security, pair them with a deadbolt.
What finishes are available?
Options include Bright Brass, Satin Chrome, Oil-Rubbed Bronze, and Matte Black, matching other hardware.
Can knob locks be keyed alike with other locks?
Yes. Most accept SC1 or KW1 keyways and can be keyed to match lever locks or deadbolts in the same property.
Why buy knob locks from National Lock Supply?
We carry high-quality knob locks in multiple ANSI functions and finishes, ready to ship, and our experts can help pair them with deadbolts or lever locks for complete security.