Marks USA 91A/ 3 Metro Mortise Lock, Entry, 2-1/2", SC1, Polished Brass

The Marks USA 71A/3 Metro Mortise Lock is engineered for apartment and commercial entry applications where reliable performance and keyed access are required. With a 2-1/2″ backset and 1″ cast deadbolt throw, it delivers strong security for standard-prep doors.

This entrance-function mortise lock includes a solid brass SC1-keyway cylinder with two keys and is pre-handed for left or right swing installation. The polished brass finish US3 offers a high-end aesthetic to match architectural hardware.

Durably built with a 1-1/16″ x 7-5/8″ steel backplate with brass cover, and a solid brass latch with ½″ throw field reversible, it supports doors from 1-5/8″ to 2-¼″ thick.

Ideal for multi-family, mixed-use or commercial entry doors, the 91A/3 Metro Mortise Lock offers a balance of architectural style, keyed security, and dependable mortise-lock functionality.