Marks USA 22AC/3-W LHR Polished Brass Double Cylinder Mortise Door Lock

Polished Brass Mortise Lockset

The Marks USA 22AC/3-W LHR is a double cylinder mortise lockset finished in polished brass. It is designed for ornamental iron gates and entry doors where a traditional knob style is required. The left-hand reverse handing suits doors that pull towards you with hinges on the right when viewed from the outside. This hardware provides keyed entry security from both sides of the opening.

Sustained Use Behaviour

Brass construction resists corrosion during long-term exposure to weather on exterior gates. The self-adjusting spindles maintain smooth knob operation even as the door or gate shifts slightly over time. Screwless knob design prevents hardware from loosening under repeated daily cycling. The mortise case protects the internal mechanism from dust and debris buildup during extended service.

Installation Practicalities

Mortise pocket preparation demands precise chiselling to fit the 1" x 7-1/8" faceplate and 2-1/2" backset accurately. Left-hand reverse handing must be confirmed before cutting using the three orientation questions supplied by the manufacturer. Thru-bolted mounting requires access to both sides of the gate or door for secure fastening. Double cylinder function means a key is always needed to exit, which affects emergency egress planning.