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Polished brass mortise entry lockset with screw-on knobs and surface-mounted plates

Marks USA

Marks USA 91A/3 Polished Brass Left Hand Mortise Entry Door Lock

SKU CH-TQDD-BZHYM MPN 91A/3

Polished brass mortise entry lockset with surface-mounted plates, screw-on knobs, swivel spindle and solid brass cylinder including two keys

  • FinishPolished Brass
  • Selling UnitBox
  • TypeMortise Entry Surface Mounted Lockset
  • FeaturesSurface Mounted plate assemblies - Screw On Knobs with Swive
  • MaterialBrass
  • Backset2-1/2"
  • Solid brass construction resists corrosion and wear
  • Surface-mounted design simplifies installation on existing doors
  • Left-hand mortise configuration fits specific door swings
  • Screw-on knobs with swivel spindle ensure smooth operation
  • Solid brass cylinder includes two keys for secure entry

Marks Metro Mortise Lockset

The Marks Metro 91A/3 is a polished brass mortise entry lockset designed for left-hand doors. It uses a surface-mounted plate assembly with screw-on knobs and a swivel spindle. The lock includes a solid brass cylinder and two keys. It functions as an entrance lock with a deadbolt and interior thumb turn.

Suits left-hand doors needing surface mount

This lockset fits doors prepared for a 2-1/2 inch backset and a 1-1/16 by 7-5/8 inch front face plate. It is not suited for right-hand door swings or mortise pockets cut for different dimensions. Buyers needing a different backset or face plate size should look at other models.

2-1/2 inch backset decides fit

The 2-1/2 inch backset is the critical measurement that determines whether this lock aligns with existing door prep. Verify this dimension before purchase. The 1 inch deadbolt throw and front plate size must also match the door cutout.

Highlights

  • Solid brass construction resists corrosion and wear
  • Surface-mounted design simplifies installation on existing doors
  • Left-hand mortise configuration fits specific door swings
  • Screw-on knobs with swivel spindle ensure smooth operation
  • Solid brass cylinder includes two keys for secure entry

Specifications

BrandMarks
Model91A/3
FinishPolished Brass
Selling UnitBox
TypeMortise Entry Surface Mounted Lockset
FeaturesSurface Mounted plate assemblies - Screw On Knobs with Swivel Spindle
MaterialBrass
Backset2-1/2"
KeyingKeyed Different
StyleKnobs
SeriesMetro
FunctionEntrance

Questions about this item

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

Turn the outside cylinder with a key to extend the 1" deadbolt, then operate the inside thumb turn to retract it; the screw-on knobs should rotate freely on the swivel spindle in both directions.

What components are included and what must be purchased separately?

The box contains the mortise lock body, solid brass surface-mounted plates, screw-on knobs with swivel spindle, solid brass cylinder, and two keys; mounting screws and any door preparation tools are not included.

Which handing should I select for my door?

Choose the left-hand version when the hinges are on the left side of the door as viewed from the outside; the lock is handed and cannot be reversed in the field.

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