Marks USA 9NY10A/3 Grade 2 New Yorker Mortise Lock, Entry, 2-1/2", SC1, Polished Brass

The Marks USA 9NY10A/3 New Yorker Mortise Lock is a versatile entrance‐function mortise lock engineered for apartment, multi‐family, and commercial entry doors. With a 2-1/2" backset and durable 1″ deadbolt throw, it aligns with typical heavy‐duty door preparations.

Included is a solid brass SC1-keyway cylinder with two keys, providing standard keying convenience out of the box. The trim is finished in polished brass US3, offering a premium architectural aesthetic.

Built for heavy use, the case is a high‐pressure cast alloy, while the lock front is reinforced with a bevel steel backplate and polished cover, ensuring reliable performance and security. The latch mechanism incorporates a reversible spring‐loaded latch and anti-friction components for smooth operation across thousands of cycles.

This mortise lockset supports door thicknesses commonly found in commercial or residential construction and is suitable for left or right swing installations with proper handing specified. Its blend of durability, keyed control, and high‐end finish makes the 9NY10A/3 ideal for entry doors where performance and appearance both matter.