Knob Latch

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Knob Latch

What is Knob Latch?

A knob latch is a door hardware mechanism that uses a knob-operated latch to secure and open interior or exterior doors.

Description

A knob latch is a door latching mechanism operated by turning a round or oval door knob to retract a spring-loaded latch bolt. When the knob is released, the latch extends back into the strike plate, holding the door closed.

In construction and building hardware applications, knob latches are commonly used on interior residential doors such as bedrooms, closets, and bathrooms. They are available in several configurations, including passage, privacy, and keyed entry sets, depending on security and access requirements. Knob latches are typically installed in pre-bored doors and paired with matching strike plates and backsets.

Proper selection and installation of knob latches are important for usability, safety, and code compliance. Factors such as door thickness, handing, accessibility requirements, and fire ratings must be considered. While knob latches are widely used, many commercial buildings prefer lever handles to meet accessibility standards.

FAQs

  • What is a knob latch?

    It is a door latch operated by turning a door knob to retract the latch bolt.

  • Where are knob latches commonly used?

    They are most commonly used on interior residential doors.

  • Are knob latches suitable for exterior doors?

    They can be used, but exterior doors typically require keyed or higher-security hardware.

  • What types of knob latches are available?

    Common types include passage, privacy, and keyed entry knob latches.

  • Are knob latches ADA compliant?

    Generally no—lever handles are preferred for accessibility compliance.

Fun Fact

Knob latches became popular in the 19th century, replacing older latch-and-string mechanisms used on early doors.

CSI Code

08 71 00

NAHB Code

870