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Pinion shaft for 48 door is identified in the SAP description as a pinion shaft for a 48 inch door, so it functions as the rack-and-pinion connector between the Knape and Vogt 8091/8092 pocket door slides, which keeps the top and bottom slide movements synchronized. The web description explains that KV8092SEB is the pinion shaft used to connect top and bottom slides, so this component ties the upper and lower 75 lb class pocket door slides together, which matters when you want the door to travel in and out of the pocket as one solid unit. The description also notes that pinion shafts are offered in 36, 48, or 72 inch lengths and can be cut to exact length, so this 48 inch version gives you extra working length for doors up to the stated maximum dimensions.
The web description identifies KV8091 and KV8092 as pocket door slides for a single door and specifies that KV8092SEB is the pinion shaft to connect the top and bottom slides, so this shaft belongs in that coordinated Knape and Vogt pocket door hardware family. The ordering instructions show that for KV8091 and KV8092 the pinion shaft is a separate step, so using this 48 inch shaft allows you to complete the linked top-and-bottom slide assembly for a 48 inch door application while following the defined system sequence.
The product class is listed as pocket door hardware and the web description places KV8091 and KV8092 slides in a 75 lb class system with maximum door dimensions of 72 inches tall by 26 inches wide, so this pinion shaft operates inside that heavy duty pocket door setup when matched to a 48 inch door. The description notes that KV8092 pocket door slides provide both top and bottom slides for a single door with hinge base plates attached to the slide bracket, and that KV8091 pocket door slides supply the top and bottom slides without hinge base plates, so this shaft ties those paired slide components together in either configuration. The same description highlights a dual rack and pinion system that eliminates potential for sag, and the pinion shaft is the part that links the racks between the two slides, so once installed across the door span it helps both ends of the door move together, which reduces twist as the door is pulled out.
The web description states that the dual rack and pinion system eliminates any potential for sag, so the shaft physically couples the top and bottom racks and keeps the door aligned, which is important when the 75 lb class rating is used on taller doors within the 72 inch height range. It also describes precision ball bearing slides providing smooth and quiet operation, so when this shaft is cut to the exact length and connected between those slides, the rack-and-pinion linkage helps the ball bearing motion feel consistent from top to bottom of the door travel. The ordering instructions call out a separate step to order the pinion shaft for KV8091 and KV8092, so selecting this 48 inch version aligns with that process when the door layout suits this length, giving you the specified connector the system expects.
The web description states that the pinion shaft connects the top and bottom pocket door slides, so it links both slide units on a single door, which keeps the door moving as one piece.
The ordering instructions show KV8091 as pocket door slides and specify a separate step to order a pinion shaft, so this shaft serves as the connector for those slides in a single door setup.
The web description lists KV8092 as pocket door slides with hinge base plates attached and identifies KV8092SEB as the pinion shaft connecting them, so this shaft plays that linking role in the 8092 system.
The description states a 75 lb class rating with maximum door dimensions of 72 inches tall by 26 inches wide, so the 48 inch shaft is used on doors within that envelope when matched to the system.
The web description notes that the dual rack and pinion system eliminates any potential for sag, so the shaft keeps top and bottom slides synchronized, which supports a straighter door travel.
The description specifies that shafts can be cut to exact length, so the 48 inch version may be trimmed during installation to match the spacing between the top and bottom pocket door slides.
The product name identifies heavy duty 75 lb pocket door slides and the web description specifies that pinion shafts in 36, 48, or 72 inch lengths connect the top and bottom slides, so choosing this 48 inch shaft aligns with door layouts that fit that span. The same description explains that shafts can be cut to exact length and that the dual rack and pinion design eliminates potential sag, so using this shaft with the matching Knape and Vogt 8091 or 8092 slides helps support straight door travel in a 75 lb class pocket door installation.
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