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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

  • FinishPolished Brass
  • Selling UnitBox
  • TypeMortise Entry Thru Bolted Lockset
  • FeaturesThrough Bolted plate assemblies - Screwless Knobs with Self
  • MaterialBrass
  • Backset2-1/2"
  • 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.

Highlights

  • 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

Specifications

BrandMarks
Model114A/3
FinishPolished Brass
Selling UnitBox
TypeMortise Entry Thru Bolted Lockset
FeaturesThrough Bolted plate assemblies - Screwless Knobs with Self adjusting Spindle
MaterialBrass
Backset2-1/2"
KeyingKeyed Different
StyleKnobs
SeriesMetro
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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