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Polished brass mortise lever lockset, left-hand, single cylinder, Thinline slim profile

Marks USA

Marks USA 2750B/3 Polished Brass Left Hand Mortise Lever Entry Door Lock

SKU CH-P4H6-VZX1X MPN 2750B/3

A slim-profile mortise lever lockset with a 1-inch backset, single-cylinder operation and solid brass construction

  • Backset distance1 in (2.54 cm)
  • Lock keyingKeyed Different
  • Main functionSingle Cylinder
  • Surface finishPolished Brass
  • Sold asBox
  • Product typeMortise Lever Lock Set
  • Slim profile fits narrow stile doors with the Thinline design
  • Polished brass finish resists corrosion while matching traditional hardware
  • Left-hand configuration aligns lever operation with door swing direction
  • Single cylinder function provides keyed entry outside and thumb-turn release inside
  • Thru-bolted brass trim ensures rigid mounting on storm door applications

Slimline Mortise Lever Set

The Marks USA 2750B/3 is a polished brass mortise lever lockset designed for left-hand doors. Its thinline profile suits narrow stile applications such as storm doors where a standard mortise body would not fit. The set includes a single cylinder on the exterior and a thumb turn on the interior. Thru-bolted brass trim and spring-loaded self-adjusting spindles provide secure, screwless lever attachment.

Narrow Stile Entry Doors

This lockset fits doors prepared for a 1 inch backset with mounting holes spaced at 8-1/4 inches. It serves commercial or residential entries needing a slim mortise mechanism and a lever handle. Buyers requiring a right-hand configuration, a different backset dimension, or a double cylinder function should look at other models. The keyed-different cylinder means each unit operates on its own unique key.

Brass Trim and Mortise Pocket

Installation requires a mortise pocket cut to accept the 1 inch by 9-7/16 inch lock face plate. The thru-bolted lever plates clamp through the door, so the door thickness must accommodate the supplied hardware. The spring-loaded spindles compensate for minor door thickness variations without adjustment. No additional cylinder or turn piece is needed; the single cylinder and interior thumb turn are integrated into the trim set.

How it compares

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

Price $149.99
Pricier than about 76% of the 2,145 comparable items (median $55.99).

Specifications

Product
Brand nameMarks
Product line2750B
Model name2750B/3
Product typeMortise Lever Lock Set
Design styleLever
Size & build
Surface finishPolished Brass
Main materialBrass
Backset distance1 in (2.54 cm)
More details
Lock keyingKeyed Different
Main functionSingle Cylinder

Questions about this item

What door thickness and backset must my existing opening have for this 1-inch backset mortise lock to fit?

The lock requires a 1-inch backset and a standard mortise pocket; the face plate measures 1 x 9-7/16 inches and mounting screw holes are spaced 8-1/4 inches apart.

Can I keep my current deadbolt and simply add this single-cylinder mortise lever set alongside it?

This set already includes a 1-inch deadbolt operated by key outside and thumb turn inside, so a separate deadbolt is not needed and would interfere with the mortise body.

How do I verify the lock is working correctly after installation?

The outside key should extend and retract the 1-inch deadbolt smoothly, the inside thumb turn should operate the same bolt, and the lever must retract the latch without binding.

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