The Timken Company 5408 Radial Shaft Oil Seal Kit

The Timken National Oil Seal 5408 (MPN 5408) is a heavy-duty radial shaft oil seal kit designed to retain lubricants while preventing dirt, moisture, and other contaminants from entering rotating shaft systems. It uses a nitrile (NBR) sealing element in a steel-case, spring-loaded single-lip design for reliability in demanding environments. Specifications include shaft ID 3.124 in (79.350 mm), outside diameter 8.250 in (209.550 mm), and overall width 0.518 in (13.160 mm), with an operating temperature range from -40°F to 225°F (-40°C to 107°C). The kit contains one oil seal, one wear sleeve, and two gaskets (G40 & G42). Typical applications span heavy-duty truck axles, industrial gearboxes, mining equipment, construction machinery, and power transmission equipment.