Flanged Pillow Blocks - Including Split Pillow and Split Block Bearings Tough and corrosion resistant, these pillow blocks are the perfect choice for use in chemically active environments. They're self-lubricating with a low coefficient of friction, plus they withstand high impact and severe abrasion. Great for wet and sanitary environments where continuous performance and minimal maintenance is required. Pillow blocks are made of FDA approved UHMW polyethylene. They are interchangeable with most conventional flanged pillow blocks. We have more than 50 standard bearing sizes in stock.