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pinion shaft for 72 door is identified in the SAP description as the pinion shaft sized for a 72 inch door, so installers can match the shaft length to pocket door systems built around a 72 inch tall opening. This shaft is described in the web description as part of the Knape and Vogt 8091 and 8092 pocket door slide system, which ties it directly to the heavy duty slides many shops already use for cabinet and multimedia doors. The same web description states that pinion shafts in 36, 48, or 72 inch lengths connect the top and bottom pocket door slides, creating a single synchronized movement instead of two independent tracks. Because the shaft is part of a dual rack and pinion system that eliminates any potential for sag, it supports consistent door travel over time on installations built to the specified dimensions.
The web description explains that KV8091 pocket door slides provide top and bottom slides for a single door without hinge base plates, while KV8092 pocket door slides provide top and bottom slides with hinge base plates attached to the slide bracket, so this pinion shaft integrates with either configuration. In the same description, ordering instructions for both KV8091 and KV8092 list "Order Pinion Shaft" as a separate step, which positions this part as the connecting element after slide length selection. Because the pinion shaft connects the top and bottom slides in the dual rack and pinion system, it helps transfer motion between the two slide locations so the door opens and closes smoothly along the rated travel.
The web description groups KV8091, KV8092, KV8092SEB pinion shaft, and KV8090 cassette roller under pocket door slides and related components, so this shaft is intended as part of a coordinated Knape and Vogt pocket door hardware setup. Within that group, the 75 lb class rating for heavy duty applications and maximum door dimensions of 72 inches tall by 26 inches wide define the door envelope that this 72 inch shaft is designed to support. Since the shaft connects the top and bottom pocket door slides for a single door in the 8091 and 8092 systems, it sits between those slide locations, tying movement at the top and bottom into one motion path. For shops building multimedia cabinets or similar casework that use doors within the stated 72 by 26 inch envelope, this positions the 72 inch shaft as a match to the listed door height while still allowing trimming when case depth calls for a shorter linkage. The association with pocket door slides in the shelf, closet, and garage organization category and multimedia and workspace components also orients this shaft toward enclosed door applications where doors need to retract into a pocket.
The web description specifies a dual rack and pinion system that eliminates any potential for sag, and states that pinion shafts connect the top and bottom pocket door slides, so this shaft is a core part of that anti-sag function. By mechanically linking the upper and lower slides, the shaft helps distribute movement and load across both slide locations, rather than letting one slide drift ahead and twist the door within the opening. The same description notes a 75 lb class rating for heavy duty applications and references precision ball bearing slides that provide smooth and quiet operation, so the shaft works within a system built for doors in that weight and size class. Because shafts can be cut to exact length as needed, installers can shorten the 72 inch shaft to suit cabinet geometry while still keeping the synchronized motion that the dual rack and pinion design uses to maintain alignment. This combination of rated dimensions, linked slides, and precision ball bearing movement lets the pinion shaft contribute directly to repeatable door operation when the door falls within the stated envelope.
The pinion shaft for 72 door matches the maximum door height listed as 72 inches tall by 26 inches wide, aligning the shaft length with the stated door envelope for the 75 lb class system.
The web description states that pinion shafts connect top and bottom pocket door slides in the KV8091 and KV8092 systems, so this shaft links their movement into a coordinated door travel.
The system is described as dual rack and pinion that eliminates any potential for sag, and the shaft is the connector, so it helps keep the door from drooping as it moves.
The web description states that shafts can be cut to exact length as needed, so the 72 inch shaft can be trimmed to suit the specific pocket depth within the rated envelope.
The associated pocket door system is listed with a 75 lb class rating for heavy duty applications, so this shaft functions within that rated door weight range.
The web description notes precision ball bearing slides that provide smooth and quiet operation, and the pinion shaft ties those slides together so both ends of the door share that controlled movement.
The SAP description identifies this product as a pinion shaft for 72 door and the web description places it in the KV8091 and KV8092 pocket door slide family, so it is suited to projects using those Knape and Vogt systems within the stated 72 inch by 26 inch and 75 lb envelope. Because the shaft connects top and bottom slides in a dual rack and pinion layout that eliminates any potential for sag, choosing this length gives cabinet and closet projects a linkage that supports aligned, repeatable door travel while still allowing cutting to exact length as required by the casework design.
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