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Polished brass mortise lockset with ornamental iron knob and thumb turn, left hand

Marks USA

Marks USA 22F/3-W-LHR mortise lockset, polished brass, F function, left hand

SKU CH-N857-1CDCR MPN 22F/3-W-LHR

A dormitory mortise lockset with F-function panic-proof exit, keyed outside entry and automatic relocking, finished in polished brass for left-hand doors

  • Backset distance2-1/2 in
  • Lock keyingKeyed Different
  • Main functionDormitory, F Function
  • Surface finishPolished Brass
  • Sold asBox
  • Product typeMortise lockset
  • Panic-proof exit unlocks by turning the inside knob
  • Dormitory F function locks automatically after every exit
  • Left-hand handing matches door swing direction
  • Polished brass US3 finish resists corrosion and wear
  • 2-1/2" backset fits standard mortise door prep

Mortise dormitory lockset

This mortise lockset is built for commercial dormitory doors and operates with an F-function panic-proof mechanism. It unlocks from the outside with a key and from the inside by simply rotating the knob, which retracts the bolt and shifts the rocker to prevent re-entry without a key. The lock fits doors between 1-3/8" and 1-3/4" thick and features a 2-1/2" backset with a 1" deadbolt.

Suited for automatic relocking exits

This lock suits dormitory rooms or exit doors where occupants must leave quickly and the door must secure itself automatically after each use. The single-cylinder design with ornamental iron knob and rose provides a traditional appearance. It is not intended for applications requiring free passage from both sides or electronic access control integration.

Left-hand handing and F-function operation

The unit is configured for left-hand doors only and cannot be rehanded in the field. Its defining characteristic is the F-function operation: inside rotation retracts the latch and deadbolt simultaneously while locking the outside trim, ensuring the door relocks upon closing. Buyers must verify the door thickness range and handing match the installation.

How it compares

Measured against everything we stock in Door Lock Sets & Deadbolts, at today’s prices. Recalculated every night.

Price $154.99
Pricier than about 77% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product line22F/3-W-LHR
Model name22F/3-W-LHR
Product typeMortise lockset
Design styleKnobs
Size & build
Surface finishPolished Brass
Backset distance2-1/2 in
More details
Lock keyingKeyed Different
Main functionDormitory, F Function

Questions about this item

How can I verify the lock is working correctly after installation?

Test that the outside key retracts the deadbolt, the inside knob rotates to throw the bolt back and shifts the rocker, and the thumb turn remains stationary during inside egress.

What components are included and what must be purchased separately?

The box contains the mortise lock body with 1" deadbolt, 1" x 7-1/8" front face plate, ornamental iron knobs, rose trim, thumb turn and cylinder; no extra parts are required for a standard 1-3/8"–1-3/4" door.

Which handing should I select for my door?

Choose the left-hand version (LHR) when the hinges are on the left as you face the door from the outside; a right-hand model is a separate SKU.

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