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Polished brass mortise lockset with screwless knobs, right-hand entry function

Marks USA

Marks USA 5NY10A/3 Polished Brass Right Hand Entrance Mortise Door Lock

SKU CH-DPWD-PMRJ9 MPN 5NY10A/3

Grade 1 steel-body mortise lock with polished brass trim, right-hand entry function, 3-hour fire rating and screwless thru-bolted knobs

  • Security gradeHeavy Duty
  • Location typeInstitutional and Industrial
  • Backset distance2-3/4 in
  • Grade1
  • Lock keyingKeyed Different
  • Fire rated3 hr
  • Grade 1 certified for heavy-duty security
  • UL listed with three-hour fire rating for code compliance
  • All-steel internal components resist forced entry
  • Screwless thru-bolted knobs prevent tampering
  • Solid brass cylinder and plates withstand corrosion

Right-hand mortise entrance lock

This Grade 1 mortise lockset is built for right-hand doors in institutional and industrial settings. Its steel body and solid brass trim deliver heavy-duty security for high-traffic entry points. The entrance function uses an outside cylinder and an interior thumb turn for controlled access. UL listing and a three-hour fire rating confirm code compliance.

Steel internals withstand constant use

All internal components are steel, so the mechanism resists wear from repeated daily operation better than locks with mixed-material parts. The scissor latch and anti-friction latch combine to reduce binding during sustained cycles. Thru-bolted, screwless knobs keep the trim rigid when the door sees heavy traffic. This construction supports reliable latching and deadbolt action over long periods.

Solid brass plates and wide face plate

The polished brass finish covers solid brass front and strike plates that resist corrosion in demanding environments. A 1-1/4 by 8 inch wide face plate distributes force across a larger area of the door edge. Thru-bolted mounting eliminates exposed screws, simplifying cleaning and preventing tampering. The 2-3/4 inch backset fits standard commercial door prep.

How it compares

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

Price $211.99
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

Does the 1" deadbolt throw generate noticeable heat or noise during continuous daily use?

The lock is a purely mechanical mortise set with all-steel internal components and a 1" deadbolt throw; it has no motor or electronics, so it produces no heat and only the normal sound of the bolt engaging.

What door preparation and cylinder format are required to install this right-hand mortise lockset?

The unit needs a standard mortise pocket with a 2-3/4" backset and a 1-1/4" x 8" face plate cut-out; it ships with a solid brass cylinder and two keys, so no separate cylinder purchase is needed.

Will the ANSI-A156.13 Grade 1 body and 3-hour fire rating work with an existing fire-rated door and frame?

Yes — the lock carries a 3-hour UL fire rating and meets ANSI-A156.13 Grade 1, so it is approved for use on labeled fire doors and frames that require the same rating.

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