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
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

  • Security gradeHeavy Duty
  • Location typeInstitutional and Industrial
  • Backset distance2-3/4 in
  • Grade1
  • Lock keyingKeyed Different
  • Fire rated3 hr
  • 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.

How it compares

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

Price $228.99
Pricier than about 85% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product lineGrade 1 New Yorker Series
Model name5NY10A/26D
Product typeDeadbolts
Design styleKnobs
Size & build
Surface finishSatin Chrome
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

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.

More in Door Lock Sets & Deadbolts

Similar items