Advanced Materials & Tribology supplies Cast Iron made Two Bolt Self-Aligning Pillow Block. Advanced Materials & Tribology offers a wide range of Oil-less self-lubricated Bearings and Plates, Self Lubricating Bushes and Pump Bearings. Advanced Materials & Tribology is an ISO accredited company. The Cast Iron made Two Bolt Self-Aligning Pillow Block is dimensionally interchangeable with ball bearing pillow blocks and is used where ball bearings have failed due to environment or temperature condition. The Pillow Block is available in shaft sizes of ½ to 3 ".