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Satin chrome mortise lockset with screwless knobs and thumb turn

Marks USA

Marks USA 5NY10A/26D Satin Chrome Right Hand Entrance Mortise Door Lock

SKU CH-5PMM-KF3EQ MPN 5NY10A/26D

Grade 1 mortise entrance lockset with steel internal components, satin chrome finish, right-hand operation, screwless thru-bolted knobs, 3-hour fire rating and two keys included

  • FinishSatin Chrome
  • Selling UnitBox
  • TypeDeadbolts
  • FeaturesSteel Body (all Internal Body Components are Steel)
  • Security LevelHeavy Duty
  • Location TypeInstitutional and Industrial
  • Grade 1 security for institutional and industrial doors
  • 3-hour fire rating meets UL listing requirements
  • All-steel internal components resist forced entry
  • Screwless thru-bolted knobs simplify installation
  • Satin chrome finish on brass plates and cylinder

Right-hand entrance mortise lock

The Marks USA 5NY10A/26D is a Grade 1 mortise lockset designed for right-hand doors in institutional and industrial settings. Its entrance function combines a keyed cylinder on the outside with a thumb turn on the inside for controlled access.

Steel body and fire-rated construction

All internal components are steel, meeting ANSI-A156.13 Grade 1 standards for heavy-duty security. The lock carries a UL listing and a three-hour fire rating, making it suitable for fire-door assemblies.

Screwless thru-bolted knobs and wide face plate

Solid satin chrome plates and screwless knobs are thru-bolted for a clean appearance and resistant mounting. The wide front face plate measures 1-1/4 inches by 8 inches, and the set includes a solid brass cylinder with two keys.

Highlights

  • Grade 1 security for institutional and industrial doors
  • 3-hour fire rating meets UL listing requirements
  • All-steel internal components resist forced entry
  • Screwless thru-bolted knobs simplify installation
  • Satin chrome finish on brass plates and cylinder

Specifications

BrandMarks
Model5NY10A/26D
FinishSatin Chrome
Selling UnitBox
TypeDeadbolts
FeaturesSteel Body (all Internal Body Components are Steel)
Security LevelHeavy Duty
Location TypeInstitutional and Industrial
MaterialSteel
Backset2-3/4"
Grade1
KeyingKeyed Different
StyleKnobs
Fire Rated3 hr
SeriesGrade 1 New Yorker Series
FunctionEntrance

Questions about this item

How do I install the 5NY10A/26D mortise lock without damaging the screwless knobs?

The knobs are thru-bolted through the steel body. Align the spindle, slide the outside knob onto the square shank, then tighten the through-bolts from the inside rose. Do not force the knobs onto the spindle before the bolts are started — that is the step most installers get wrong.

What maintenance will the 2-3/4" backset mortise lock need over time?

Lubricate the scissor latch, anti-friction latch and 1" deadbolt with a dry PTFE spray once a year. The solid steel internal parts do not require adjustment, but the satin chrome cylinder should be cleaned with compressed air if key insertion becomes stiff.

How long will the ANSI-A156.13 Grade 1 lock hold its fire rating under sustained heat?

The lockset is UL listed for a 3 hour fire rating. That rating is the first limit reached under continuous fire exposure; the steel body and cylinder remain operational for the full three-hour test period.

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