Tri-ply seal bearings are designed for service involving severe contamination, such as disk harrows, disk tillers and other seed preparation equipment and certain conveyor applications. Tri-ply sealed units come in two designs - one consisting of three Timken® rubber seals separated by steel spacers and retained by steel caps in the outer ring and the other, a highly effective one-piece, molded seal design. Both designs have an exterior shroud cap to protect the seals and reinforce the exceptional sealing action of the complete unit. A patented notched seal groove design, provided on selected sizes, is one of the most positive seal retention methods ever developed. Fafnir® Radial Deep Groove Ball Bearing, Relubricatable Square Bore, Series: 200, 1.428 in Bore, 3.1496 in OD, 1 Rows, 1.438 in Width, Double Seal Closure, 8300 lb Dynamic/4500 lb Static Load, Steel Bearing, Rubber Seal, Steel Cage, -30 to 275 °F, Uncoated