Pillow Block Bearings for Sale
Rotating shafts need support, and that comes from a pillow block bearing. At Discount Bearings, we sell pillow block bearings for every application. Outdoors, indoors, hostile environments and clean environments — we cover them all. Whether you need small or heavy-duty pillow block bearings, you can buy them from us.
Pillow Block Bearing Terminology
If you’re going to buy pillow block bearings, you need to understand the terms used and options available.
A pillow block bearing is a bearing contained within a housing. That housing mounts to a surface parallel to the shaft and bearing axis. A pillow block bearing has two main components: the housing and the bearing.
Housings come in two types: the “plummer” block and the split block. Plummer blocks contain the bearing completely, while a split block opens into two pieces. Split blocks can be assembled around a shaft, while plummer blocks pass over the shaft from one end.
Bearings come in many types. Ball and roller bearings are the most common. The outer shell or race is held by the housing while the inner race mounts to the shaft. Balls or rollers separate the two and are held in place by a cage. These bearings usually have some
freedom to self-align with the shaft.
Selecting Pillow Block Bearings
Ball bearings handle both radial and thrust loads. Load-carrying ability is limited so heavy-duty pillow block bearings usually have roller bearings.
Roller bearings can be either tapered, cylindrical or spherical in style. Tapered roller bearings handle thrust loads up to 60 percent of their radial load limit. Cylindrical roller bearings take high speeds and radial loads but are limited in thrust handling. Spherical or crowned roller bearings take high loads and shock impacts but are limited in speed.
Small pillow block bearings often incorporate needle rollers. There are other pillow block designs that use sliding rather than rotating element bearings.
Options for Housings
Anyone buying pillow block bearings should consider housing material, lubrication method, seals and how the bearing secures to the shaft.
Cast iron is the most common housing material. It’s inexpensive and provides good vibration dampening. Cast steel and stainless steel are alternatives, as is aluminum. Aluminum in particular combines good load-carrying ability with high thermal conductivity. That’s useful in high-speed applications where the bearing might get hot.
Housings are also available in a range of plastics, (various nylons and acetal polymers) as well as pressed steel. The latter are very affordable but are only for low-load applications.
Effective lubrication is essential for long bearing life. If you’re evaluating a range of pillow block bearings for sale never overlook this aspect.
Seals on either end of the bearing exclude dirt that will otherwise shorten bearing life. There are many options.
In most types of pillow block bearing, the inner race is secured to the shaft. There are several ways of doing this. Consider the alternatives before selecting the best for your application.
Every rotating shaft needs support from one or more pillow block bearings. Applications span power transmission and machinery of every kind. Rollers are often secured with pillow block bearings, even rotating cables can be supported this way. A particular feature of these bearings is that they self-align. This simplifies installation, reducing noise and vibration and helping ensure long bearing life.
Choose Your Own or Ask for Advice
There’s an almost limitless variety of pillow block bearings. Search our site to find the one that’s right for your application. Alternatively, describe your needs in our contact form and a specialist will get back to you quickly.