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Cambridge Door Knob product photography coming soon — BEX solid brass hardware

Traditional | Solid Brass

Cambridge Door Knob

SKU: 4300.67CAB3NL.013NL
Sale price$190.00 USD
Rosette:
Function:
Finish:US3NL Unlacquered Brass
Dimensions & Specifications
Knob Diameter 2-5/16″
Projection 2-1/2″
Rosette Dimensions 2-9/16″ × 4-3/8″ with a 3/8″ depth
Weight 3.3 lbs per standard set (Solid, heavy-weight structure)
Technical Preparation & Installation
Backset Adjustable 2-3/8″ or 2-3/4″ (Standard latches included)
Door Preparation Fits standard pre-drilled North American doors with a 2-1/8″ cross bore and a 1″ edge bore.
Door Thickness Range 1-3/8″ to 1-3/4″ standard. Thick door kits are available for doors up to 3.5″ thick and include extended threaded cylinders, longer square steel spindles, and extended rosette screws.
Mounting System Heavy-duty concealed machine screws for a seamless architectural look.
Tool Warning Installation requires hand tools only.
Never use power tools or impact drivers — this may strip internal threads or snap screw heads.
Mechanical Engineering & Functionality
Chassis & Spring Mechanics Grade 2 heavy-duty tubular chassis with independent heavy-duty springing that keeps the knob returning true and prevents loosening over decades of use.
Acoustic Control Integrated anti-friction polymer insert in the latch bolt for nearly silent closing while reducing wear on the metal strike plate.
Available Configurations
  • Passage & Privacy — Both functions share the same rosette and standard door preparation. The Privacy set adds an integrated locking pin housed within the rosette; a simple press engages the lock for bedrooms and baths — no secondary hardware or specialized milling required.
  • Half Dummy — Stationary set for one side of a door, surface-mounted using wood screws.
  • Double Dummy — Symmetrical non-operating knobs on both sides, through-bolted using existing bore holes to withstand heavy pulling forces.
Material & Finish Technologies
Material Composition Solid Forged Brass. Excludes inferior zinc alloys, aluminum, or hollow pot metals.
Finish Technologies
  • PVD (Physical Vapor Deposition) — Vaporized metals bond to the brass substrate in a vacuum chamber, creating an impenetrable layer with extreme corrosion resistance. Ideal for high-traffic or coastal applications.
  • Lacquered & Electroplated — Protected by a highly durable, industrial-grade clear lacquer baked at low temperatures to prevent the underlying brass from oxidizing.
  • Living Finishes — Unlacquered finishes (such as Natural Brass or Oil-Rubbed Bronze) are designed to interact with the environment, oxidizing and developing a dynamic, unique patina over time.
Certifications & Warranty Data
Compliance & Safety
  • 20-minute certified UL fire-rated option available.
WARNING: This product can expose you to chemicals including lead and/or wood dust, known to the State of California to cause cancer and birth defects or other reproductive harm.
Door Handing Guide
Door handing diagram showing left-hand and right-hand configurations

Stand at the exterior side of the door, facing in. If the hinges are on the left, the door is left-handed. If the hinges are on the right, the door is right-handed.

The Cambridge Knob by BEX is a classic bun knob crowned with concentric stepped rings, a detail borrowed from fine period hardware that draws the eye to its center, while the full rounded shoulder settles comfortably into the hand. Measuring 2-5/16 inches in diameter, the solid brass Cambridge pairs with the Bordeaux, Classic Round, Hawthorne, and Ellington rosettes — ideal for historic restorations and collegiate-classic interiors.

The Cambridge's rings are turned into solid brass on a lathe, not stamped, so each step stands proud and sharp in any BEX finish.

additional details

BEX Products

about the brand

A premium architectural hardware collection engineered for modern luxury. This product line delivers exceptional functionality and timeless design, precision-machined from solid brass and structurally engineered metals.

Explore our complete catalog of mortise hardware, entrysets, and cabinet finishes built specifically to meet demanding architectural requirements while delivering unparalleled aesthetic continuity across your projects.