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

Marks USA

Marks USA 114A/3 Polished Brass Left Hand Mortise Entry Door Lock

SKU CH-6NZN-DMNRR MPN 114A/3

A left-hand mortise entrance lockset with through-bolted brass knobs and a solid brass cylinder

  • Backset distance2-1/2 in
  • Lock keyingKeyed Different
  • Main functionEntrance
  • Surface finishPolished Brass
  • Sold asBox
  • Product typeMortise Entry Thru Bolted Lockset
  • Solid brass plates resist wear and corrosion
  • Through-bolted knobs with self-adjusting spindle simplify installation
  • Mortise entrance function provides cylinder outside and thumb-turn inside
  • 2-1/2" backset fits standard commercial door prep
  • Supplied with solid brass cylinder and two keys

Polished Brass Mortise Entry Lockset

This Marks Metro 114A/3 lockset is a left-hand mortise entry set finished in polished brass. It suits commercial or residential doors that require a 2-1/2 inch backset and a through-bolted installation. The solid brass cylinder and screwless knobs deliver a traditional appearance with durable construction. Buyers who need a right-hand configuration or a different backset cannot use this unit.

Through-Bolted Knobs and Self-Adjusting Spindle

The through-bolted plate assemblies mount securely from both sides of the door, reducing loosening over time. Screwless knobs with a self-adjusting spindle simplify fitting and maintain alignment without exposed hardware. Two keys are supplied with the solid brass cylinder for immediate keyed-different operation. Installers who prefer surface-mounted screws or a non-through-bolted trim will find this design unsuitable.

2-1/2 Inch Backset Determines Fit

The 2-1/2 inch backset is the critical dimension that decides whether this mortise lock aligns with existing door prep. A 1 inch deadbolt throw and a 1-1/16 by 7-5/8 inch front face plate complete the cut-out requirements. Doors prepared for any other backset measurement will not accept this lockset without modification.

How it compares

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

Price $67.99
Pricier than about 55% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product lineMetro
Model name114A/3
Product typeMortise Entry Thru Bolted Lockset
Design styleKnobs
Size & build
Surface finishPolished Brass
Main materialBrass
Backset distance2-1/2 in
More details
Lock keyingKeyed Different
Main functionEntrance

Questions about this item

Will the solid brass cylinder need periodic lubrication or replacement?

The solid brass cylinder operates with the two keys supplied; brass resists corrosion so no scheduled lubrication or cylinder swap is required.

What mechanical limit appears first when the entrance function is used continuously?

The 1-inch deadbolt throw and 2-1/2-inch backset define the latch travel; the bolt reaches its full extension before any other part binds.

Does the polished brass finish or the through-bolted knob design generate noticeable heat or noise during all-day operation?

Brass hardware and through-bolted screwless knobs run silently and stay at room temperature; no motor or electronic components produce heat or sound.

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