Advanced Materials & Tribology supplies Four 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 Four Bolt Self-Aligning Pillow Block is suitable for large tough applications like traveling trash screens and heat treat ovens. The Self-Aligning Pillow Block is available with replacement inserts. The Pillow Block comes with Cast Iron Shaft of sizes ranging from 1 ½ to 6".