A pillow block housing has which feature?

• A. Built in bearing
• B. External bearing
• C. No lubrication port
• D. Adjustable Mounting

Answer: (A)

A pillow block housing is designed to hold a bearing inside a fixed, rigid block that can be bolted to a base. The defining feature is that the bearing is contained within the housing, making it a complete bearing unit that’s easy to install and align with a shaft. This built-in bearing simplifies mounting and ensures consistent alignment between the shaft and the housing.

Other options describe characteristics that aren’t universal or defining for this component: some pillow blocks do include lubrication features, but not all; the concept isn’t about the absence of a lubrication port. The idea of an external bearing goes against the purpose of a pillow block, which is to provide an integrated bearing in a single housing. Adjustable mounting isn’t inherent to the basic pillow block, which typically uses fixed mounting holes to secure the unit.