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Polished brass mortise lockset with screwless knobs and wide face plate

Marks USA

Marks USA 5NY10A/3 Polished Brass Left Hand Entrance Mortise Lock Set

SKU CH-PPCP-5TMAP MPN 5NY10A/3

Grade 1 mortise lockset with steel internal components, polished brass trim, screwless thru-bolted knobs and a 3-hour fire rating for heavy-duty entrance doors

  • Security gradeHeavy Duty
  • Location typeInstitutional and Industrial
  • Backset distance2-3/4 in
  • Grade1
  • Lock keyingKeyed Different
  • Fire rated3 hr
  • Grade 1 security for heavy-duty institutional use
  • 3-hour fire rating meets UL safety standards
  • All-steel internal components resist forced entry
  • Screwless thru-bolted knobs prevent tampering
  • Solid brass cylinder with two keys included

Heavy-duty entrance mortise lockset

The Marks USA 5NY10A/3 is a Grade 1 mortise lockset built for institutional and industrial doors. Its steel body and internal components meet ANSI-A 156.13 Grade 1 and carry a three-hour UL fire rating. The lockset operates with a cylinder outside and thumb turn inside for entrance function.

Steel body with screwless thru-bolted knobs

All internal parts are steel, while the exterior plates are solid brass in a polished brass finish. Knobs attach without visible screws through a thru-bolted design that resists tampering and daily abuse. The wide front face plate measures to fit standard mortise preparations and the 2-3/4 inch backset suits common commercial door specs.

Replaces lower-grade cylindrical locks

This set upgrades doors that currently use Grade 2 or unrated hardware where fire codes or high traffic demand Grade 1 performance. The jump is worth it when a three-hour fire rating is required or when vandal-resistant screwless trim is specified. It is not for residential doors that need a simple tubular latch or for right-hand openings.

How it compares

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

Price $214.99
Pricier than about 84% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product lineGrade 1 New Yorker Series
Model name5NY10A/3
Product typeDeadbolts
Design styleKnobs
Size & build
Surface finishPolished Brass
Main materialSteel
Backset distance2-3/4 in
More details
Security gradeHeavy Duty
Location typeInstitutional and Industrial
Grade1
Lock keyingKeyed Different
Fire rated3 hr
Main functionEntrance

Questions about this item

What does the ANSI-A 156.13 Grade 1 rating mean for daily security?

The ANSI-A 156.13 Grade 1 rating confirms the lock meets the highest standard for cycle durability and forced-entry resistance in commercial and institutional buildings.

What door preparation is required for the 2-3/4" backset and 1-1/4" x 8" front plate?

A mortise pocket cut to accept a 1-1/4" wide by 8" high face plate with a 2-3/4" backset measured from the door edge to the centre of the knob spindle.

How are the screwless knobs secured during installation?

The knobs are thru-bolted through the door and lock body; the mounting bolts pass completely through both sides and are tightened from the interior rose, eliminating exposed screws.

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