The Timken Company 99424 Redi-Sleeve Shaft Repair Sleeve

The Timken National Redi-Sleeve 99424 is a stainless steel shaft repair sleeve that installs directly over a worn or damaged sealing surface to restore a smooth, wear-resistant contact area for standard radial shaft oil seals without shaft replacement or machining. As part of the Redi-Sleeve 99000 Series, this precision thin-wall sleeve features a hardened, precision-ground running surface with a lead-free finish and a flange for secure seating on 4.248–4.256 in shafts (nominal 4.250 in). Its overall width is 1.000 in, with a seal-running width of 0.813 in and an installation depth of 1.375 in, designed to preserve shaft dimensions while extending seal life. Weighing about 0.67 lb, it accommodates standard radial shaft oil seals for roughly 4.250 in diameters and is suitable for pumps, gearboxes, compressors, electric motors, conveyors, mining equipment, agricultural machinery, wheel hubs, and other heavy rotating machinery where lubricant leakage or premature seal failure has occurred. Common replacements and compatibility notes include SKF Speedi-Sleeve 99424 and National Redi-Sleeve 99424 equivalents, making this a practical retrofit for existing 4.250 in shaft assemblies.