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Polished brass mortise lockset with screwless knob and wide face plate

Marks USA

Marks USA 7NY10DW/3 Polished Brass Left Hand Mortise Lockset

SKU CH-0MC4-RYEY9

A polished brass mortise lockset with screwless thru-bolted knobs and a left-hand vestibule function that stays locked from the outside

  • FinishPolished Brass
  • TypeMortise Lockset
  • KeyingKeyed Different
  • Always-locked vestibule function keeps the outside secure
  • Latch-only design simplifies operation with no deadbolt or rocker
  • Thru-bolted screwless knobs resist tampering and loosening
  • Solid polished brass plates and cylinder withstand heavy commercial use
  • Left-hand configuration with 2-3/4" backset fits standard door prep

Polished Brass Mortise Lockset

The Marks New Yorker 7NY10DW/3 is a commercial-grade mortise lockset with a polished brass finish and left-hand orientation. It features a vestibule function where the latch is always locked from the outside and operated by key only, with no interior thumb turn. Solid brass plates and a scissor-type anti-friction latch provide durability for high-traffic storeroom or vestibule doors.

Thru-Bolted Screwless Installation

The lockset uses thru-bolted screwless knob plate assemblies for a clean appearance and secure mounting on standard door thicknesses. Installers must prepare a mortise pocket matching the 1-1/4" x 8" wide face plate and 2-3/4" backset. Common issues include misaligned mortise cuts preventing the latch from engaging and incorrect door handing, as this unit is strictly left-hand and not field-reversible.

Commercial Storeroom and Vestibule Doors

This lockset suits property managers and contractors fitting offices, storage rooms, or building entrances that require key-only exterior access and permanent locking. It is not suitable for residential entry doors needing interior egress via thumb turn, nor for right-hand doors without ordering the correct handing. Buyers needing a deadbolt function or privacy latch should select a different model.

Highlights

  • Always-locked vestibule function keeps the outside secure
  • Latch-only design simplifies operation with no deadbolt or rocker
  • Thru-bolted screwless knobs resist tampering and loosening
  • Solid polished brass plates and cylinder withstand heavy commercial use
  • Left-hand configuration with 2-3/4" backset fits standard door prep

Specifications

FinishPolished Brass
TypeMortise Lockset
KeyingKeyed Different

Questions about this item

How do I confirm the lock is working correctly after installation?

Test the outside knob with a key — it should retract the scissor latch and anti-friction latch. The inside knob must operate freely without a thumb turn, and the lock should remain locked on the exterior at all times.

What components are included and what must I purchase separately?

The set includes the mortise lock body with wide face plate, left-hand screwless knob assemblies thru-bolted, solid brass cylinder and two keys. You will need to supply your own mounting screws and any strike plate not already on the door frame.

Which version should I choose for a left-hand door needing storeroom function?

This 7NY10DW/3 model is built specifically for left-hand doors with vestibule storeroom function — latch only, no deadbolt or rocker, and a cylinder outside with no interior thumb turn.

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