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Polished brass door knob and rose assembly kit, pair

Progressive Hardware Co., Inc.

Progressive Hardware Co., Inc. K6220/3 Solid Brass Knob Rose Assembly Kit Door

SKU CH-662S-PZYFT

Solid brass knob and rose assembly kit with spring-loaded spindles, through-bolted for Marks 22AC mortise locks, includes screws for two door thicknesses

  • Surface finishPolished Brass
  • Sold asPair
  • Solid brass construction resists corrosion and wear
  • Pre-assembled knob and rose save installation time
  • Spring-loaded spindles ensure smooth, reliable latch operation
  • Thru-bolted design provides secure mounting on mortise locks
  • Includes screws for both 1-3/8" and 1-3/4" door thicknesses

Solid Brass Knob Rose Assembly Kit

The Progressive Hardware K6220/3 is a solid brass knob and rose assembly kit designed for mortise lock applications. It functions as a direct replacement for Marks USA K9220 hardware on iron gate doors. Each unit arrives pre-assembled for immediate installation.

Suited for mortise lock restoration on 1-3/8"

This kit suits restorers and locksmiths needing thru-bolted mounting with included screws for two standard door thicknesses. It is not for buyers who need cylindrical lock compatibility or hardware without a 9/32" square spindle requirement.

Includes paired knobs, springs.

The box contains one pair of pre-assembled knob and rose units with spring-loaded spindles. Supplied fasteners accommodate both 1-3/8" and 1-3/4" door preparations, eliminating the need to source separate mounting hardware.

How it compares

Measured against everything we stock in Door Stops, Hinges & Window Hardware, at today’s prices. Recalculated every night.

Price $36.99
Pricier than about 81% of the 316 comparable items (median $14.99).

Specifications

Size & build
Surface finishPolished Brass

Questions about this item

What mortise lock must already be installed for this K6220/3 knob assembly to fit?

It replaces the Marks USA K9220 and is designed for Marks 22AC knobs on mortise locks.

Will the included spindles work with the existing 22AC hardware I plan to keep?

Each spring-loaded spindle is 9/32" square, matching the 22AC specification for direct compatibility.

How can I verify the thru-bolted installation is secure after fitting the pair?

Both knobs should feel solid with no wobble, and the latch should retract smoothly when either knob is turned.

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