We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Polished brass round door knob pair with rose, thru-bolted mortise lock assembly

Marks USA

Marks USA MKRW10-3 Polished Brass US3 Heavy Insert Round Knob Ball Assembly door lock

SKU CH-706J-2107F MPN MKRW10-3

Replacement knob assembly for through-bolted mortise locks, includes spring-loaded spindle and mounting screws

  • FinishPolished Brass
  • Selling UnitBox
  • TypeDoor Knob
  • Polished Brass US3 finish resists corrosion and matches classic hardware
  • Heavy-duty insert construction withstands frequent use in commercial settings
  • Thru-bolted mounting provides secure attachment to mortise lock bodies
  • Compatible with Marks 7RW10, 9RW10, 5RW10, 55RW10 and 22AC lock sets
  • Pre-assembled knob and rose with included screws simplify installation for 1-3/4" doors

Product identity

This Marks USA MKRW10-3 assembly is a heavy-insert round knob ball set finished in polished brass US3. It serves as a direct replacement for through-bolted mortise lock sets such as the Marks 7RW10, 9RW10, 5RW10, 55RW10 and 22AC models. The knobs and roses arrive pre-assembled, with one pair packed per box.

Compatibility check

Verify that the existing lock is a through-bolted mortise type listed in the compatibility data. Confirm the door thickness matches the supplied 1-3/4 inch mounting screws and that the spindle accepts a 9/32 inch square spring-loaded shaft. The kit will not suit cylindrical, tubular or non-through-bolted mortise locks.

Sustained use

The heavy-insert construction and through-bolted mounting distribute torque evenly across the lock body, reducing wear on the spindle and rose during repeated operation. The solid brass finish resists surface corrosion and maintains mechanical tolerances over extended service cycles without loosening.

Highlights

  • Polished Brass US3 finish resists corrosion and matches classic hardware
  • Heavy-duty insert construction withstands frequent use in commercial settings
  • Thru-bolted mounting provides secure attachment to mortise lock bodies
  • Compatible with Marks 7RW10, 9RW10, 5RW10, 55RW10 and 22AC lock sets
  • Pre-assembled knob and rose with included screws simplify installation for 1-3/4" doors

Specifications

BrandMarks USA
ModelMKRW10-3
FinishPolished Brass
Selling UnitBox
TypeDoor Knob

Questions about this item

What comes in the box and do I need to buy anything else?

One pair of pre-assembled polished brass knob-and-rose units with 9/32" square spring-loaded spindles and mounting screws for 1-3/4" doors is included; no extra parts are required for standard installation

Which Marks mortise lock models does this knob assembly fit?

It is designed for Marks 7RW10, 9RW10, 5RW10, 55RW10 and 22AC Iron Gate locks, plus most other through-bolted mortise lock sets

How does the 9/32" square spindle perform once installed in a real door?

The spring-loaded 9/32" square spindle engages the mortise lock hub directly, delivering positive latch retraction and automatic return on every turn

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.