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 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

  • Backset distance2-1/2 in
  • Lock keyingKeyed Different
  • Main functionEntrance
  • Surface finishPolished Brass
  • Sold asBox
  • Product typeMortise Entry Surface Mounted Lockset
  • 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.

How it compares

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

Price $75.99
Pricier than about 58% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product lineMetro
Model name91A/3
Product typeMortise Entry Surface Mounted 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

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.

More in Door Lock Sets & Deadbolts

Similar items