The Schlage XB11-720 is the OEM mortise cylinder turn unit with ADA compliant style thumbturn for Schlage L Series mortise locks that use a mortise cylinder thumbturn as the inside control. It is a non-handed assembly - it installs on both right-hand and left-hand applications without modification. Finish must be specified at time of order. This unit is the field replacement for the inside mortise cylinder thumbturn assembly when the thumbturn fails, is damaged, or when an existing non-ADA thumbturn installation must be updated to meet ADA accessibility requirements.

The XB11-720 is documented in the Schlage L Series Service Manual and is the correct ADA thumbturn part for mortise cylinder turn unit functions. It is not interchangeable with the rose trim thumbturn - if the installed lock uses a rose trim with the 09-509 basic turn, the ADA upgrade option for that configuration is the L583-363, not the XB11-720. The Allegion Knowledge Base confirms this distinction explicitly.

Schlage Mortise Cylinder Turn Unit: Which L Series Functions Use the XB11-720

The XB11-720 applies to L Series functions where inside control of the deadbolt is accomplished through a mortise cylinder position rather than a rose-mounted thumbturn button. The primary compatible functions are:

L9460 (Cylinder x Thumbturn): The deadbolt is actuated by key from outside or by thumbturn from inside. The thumbturn can both extend and retract the deadbolt - full bidirectional inside control.

L9462 (Double Cylinder): Both inside and outside positions use a key cylinder. The XB11-720 turns what would be a keyed inside cylinder position into a thumbturn-operated inside cylinder, removing the need for a key on the inside while maintaining full deadbolt control.

L9463 (Classroom Cylinder): The key from outside extends and retracts the deadbolt. The thumbturn from inside can retract the deadbolt but cannot extend it. This one-way thumbturn restriction is a deliberate security feature: the occupant can always exit (retract deadbolt) but cannot accidentally lock themselves in by extending the deadbolt with the thumbturn.

The L400 Series equivalents (L463, L460, L462) use the same XB11-720 turn unit.

Schlage Mortise Cylinder: ADA Compliance and the December 2019 Standard Update

Effective December 9, 2019, Allegion updated the Schlage L Series standard: all L Series mortise locks ordered with a thumbturn now ship with the ADA thumbturn as standard. Per the Allegion Knowledge Base: the new ADA thumbturn is slightly smaller than the existing design while still meeting ADA requirements.

The ADA Standard for Accessible Design requires that operable hardware - including thumbturns - must be usable with one hand, without tight grasping, pinching, or twisting of the wrist. Standard round or narrow thumbturns fail this requirement because they require a pinch grip or finger-tip rotation. The ADA compliant thumbturn on the XB11-720 uses a wider, wing-style design that can be operated by pressing with a closed fist, palm, or single-hand grip, meeting ANSI A117.1 operable hardware standards for accessible facilities.

Customers ordering the existing larger ADA thumbturn in 612 or 613 finishes will receive the 09-509 basic turn with L583-363 as standard per Allegion's specification - confirm the function type before ordering to ensure the correct turn unit is specified.

Schlage L Series Mortise Lock Parts: XB11-720 vs XB11-979

The XB11 family includes two distinct turn unit variants. The XB11-720 (this product) is the mortise cylinder turn unit for L Series deadbolt functions. The XB11-979 is the rim cylinder with a thumbturn for Von Duprin 98/99-2 double cylinder exit device applications. These two serve entirely different applications in different lock systems and are not interchangeable.

For the complete Schlage L Series mortise lock parts catalog including thumbturn assemblies, cylinders, and trim components, SecurityParts stocks OEM replacement parts.