Technical Foundation
What Is a Door Knob Lockset?
A door knob lockset is the complete hardware assembly — knobs, rose trim, latch mechanism, strike plate and, where applicable, key cylinder — that operates a door's latch and, on entry and storeroom functions, secures it. Function is the defining spec: passage sets have no locking mechanism and are used on closets and hallways; privacy sets lock from the inside via a push-button or turn-button, typically with an emergency-release feature, for bathrooms and bedrooms; keyed entry sets lock and unlock with a key from outside and a button or turn-piece inside.
Duty rating follows ANSI/BHMA A156.2, graded 1 through 3 based on cycle testing and forced-entry resistance — Grade 1 for heavy commercial traffic, Grade 2 for light commercial and upscale residential, Grade 3 for standard residential use. Backset (the distance from the door edge to the center of the knob/cylinder) is almost always 2-3/8 in. or 2-3/4 in. and must match the door prep; door thickness (standard 1-3/4 in.) affects spindle length and must also be confirmed before ordering.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Function | Passage, privacy, keyed entry, storeroom | Determines whether and how the door locks — must match the door's intended use |
| Grade | ANSI/BHMA A156.2 Grade 1, 2, 3 | Grade 1 for heavy commercial traffic; Grade 3 for standard residential doors |
| Backset | 2-3/8 in. or 2-3/4 in. | Must match the existing door prep — wrong backset won't align with the bore holes |
| Door Thickness | Standard 1-3/8 in. to 1-3/4 in. | Affects spindle length; adjustable spindles accommodate a range but not all |
| Cylinder / Keyway | Standard pin tumbler, interchangeable core | Interchangeable core allows rekeying without removing the lockset — common in commercial buildings |
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Applications
Where Door Knob Locksets Get Used
Door knob locksets are specified for any door needing to latch and, in most cases, lock — matched to traffic level, security requirement, and existing door prep.
Commercial Office Buildings
Grade 1 or 2 keyed entry and storeroom function locksets specified for exterior and controlled-access interior doors.
Multi-Family & Residential Construction
Grade 2/3 entry and privacy locksets matched to door thickness and finish across a building's unit mix.
Healthcare Facilities
Privacy locksets with emergency-release features specified for patient rooms and restrooms.
Education & Institutional Buildings
Heavy-duty Grade 1 locksets specified for high-traffic classroom and corridor doors.
Hospitality
Interconnected locksets combining a deadbolt and knob or lever on a single trim for guest room doors.
Facilities Maintenance & Repair
Replacement cylinders, strikes, and full locksets stocked to match existing door bores without re-drilling.
FAQ
Door Knob Locksets Questions, Answered
What's the difference between passage, privacy, and entry lockset functions?
Passage function has no locking mechanism at all — it only latches, used on closets and hallways. Privacy function locks from the inside (push-button or turn-button) with no key, typically including an emergency-release pinhole, and is used on bathrooms and bedrooms. Entry function locks and unlocks with a key from the outside and a button or turn-piece from the inside, used on exterior and controlled-access doors.
What does the ANSI/BHMA grade rating actually mean?
Grade 1, 2, and 3 come from ANSI/BHMA A156.2 testing on cycle life, latch strength, and resistance to forced entry — Grade 1 is the most durable, rated for heavy commercial and institutional traffic and higher force resistance; Grade 2 suits light commercial and upscale residential use; Grade 3 is the minimum standard for typical residential doors. Higher grade generally means heavier-gauge components and a longer service life under frequent use.
How do I know if I need a 2-3/8 in. or 2-3/4 in. backset?
Backset is measured from the edge of the door to the center of the bore hole where the knob and cylinder sit. Most doors are pre-bored for one or the other — measure the existing door prep before ordering, since a lockset built for the wrong backset won't align with the existing holes without re-boring the door.
Can I rekey a keyed entry lockset myself?
Standard pin-tumbler cylinders can usually be rekeyed with a rekeying kit and the correct pins, but this requires disassembling the cylinder and matching pin lengths to a new key — many facilities instead specify interchangeable core (IC) cylinders, which let a locksmith swap the entire core with a control key in seconds, without removing the lockset from the door.
Do I need a separate deadbolt with a keyed entry knob lockset, or is the knob lock enough?
A standalone keyed entry knob lock is generally not considered adequate security for an exterior door on its own — most codes and insurance guidelines recommend pairing it with a separate deadbolt, since knob locks typically use a shorter throw latch that offers less resistance to forced entry. Interconnected locksets combine both into one trim set as an alternative to separate hardware.
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