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Satin chrome mortise lockset with matching knobs and plates, left-hand reverse orientation

Marks USA

Marks USA 21AC/26D-W-LHR Satin Chrome Left Hand Reverse Double Cylinder Mortise Door Lock

SKU CH-SBT2-7WW5B MPN 21AC/26D-W-LHR

Left-hand-reverse mortise lockset with double-cylinder deadbolt and satin-chrome brass trim for out-swinging doors

  • Location typeLeft Hand Reverse (For Out-Swinging Door)
  • Backset distance2-1/2 in
  • Lock keyingKeyed Different
  • Main functionDouble Cylinder
  • Surface finishSatin Chrome
  • Sold asBox
  • Double cylinder operation requires a key on both sides for controlled access
  • Through-bolted solid brass trim resists forced entry and withstands heavy use
  • Satin chrome finish protects the brass from corrosion and daily wear
  • Left hand reverse configuration matches out-swinging door installations
  • 2-1/2 inch backset fits standard 1-3/8 to 1-3/4 inch door thicknesses

Purpose-built security hardware

The Marks USA 21AC/26D-W-LHR is a double-cylinder mortise lockset designed for left-hand-reverse, out-swinging doors. It suits commercial steel gates and residential storm doors where keyed access is required on both sides. The satin chrome finish over solid brass resists wear in high-traffic entries. This lockset is not for interior passage doors that need only a single cylinder or thumb-turn operation.

Build integration

The lock fits doors ranging from 1-3/8" to 1-3/4" thick and uses a 2-1/2" backset with a 1" x 7-1/8" front face plate. Through-bolted knob plate assemblies anchor directly through the door for rigid mounting on metal or wood. Two mortise cylinders and two keys are included, so no separate cylinder purchase is needed. The reversible design also accommodates right-hand doors if the handing is changed during installation.

Sustained operation

Solid brass construction and through-bolted trim resist loosening under repeated daily cycles. The 1" deadbolt throws fully into the strike with each key turn, maintaining consistent engagement over time. Satin chrome plating protects the underlying brass from corrosion on exterior gate applications. Two independent cylinders ensure the deadbolt can always be operated even if one keyway becomes contaminated.

How it compares

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

Price $146.99
Pricier than about 75% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product line21AC
Model name21AC/26D-W-LHR
Product typeOrnament Unilock Knobe Mortise Lockset
Design styleKnobs
Size & build
Surface finishSatin Chrome
Main materialBrass
Backset distance2-1/2 in
More details
Location typeLeft Hand Reverse (For Out-Swinging Door)
Lock keyingKeyed Different
Main functionDouble Cylinder

Questions about this item

How does the 1" deadbolt hold up when the lock is cycled continuously on a busy entry?

The 1" throw deadbolt is built into a commercial-grade mortise case designed for high-cycle steel-gate applications.

Does the satin chrome finish or the through-bolted brass trim generate noticeable heat or noise after hours of operation?

Solid brass components and a mechanical mortise mechanism produce no measurable heat and operate silently during normal use.

Which cylinders and keys come in the box so the lock works immediately on a 1-3/4" thick out-swinging door?

Two solid brass satin chrome mortise cylinders and two cut keys are included, ready for the 2-1/2" backset prep.

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