DBH 5339Pol radial shaft seal — 40 x 56 x 8

DBH 5339Pol belongs to radial shaft seal, part of our Seals range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for 5339Pol and any equivalents.

A radial shaft seal from DBH, the 5339Pol keeps lubricant where it belongs and keeps dust, water and other contaminants out of the housing. It fits a 40 mm shaft, a 56 mm housing bore and an 8 mm height, and it uses the Lx lip configuration. Pumps, motors, gearboxes and similar rotating equipment are the usual homes for this seal. MR Industrial Accessories supplies the DBH line and can help you confirm the right choice for your application.

Reading the designation is straightforward. The part number is 5339Pol, and the three figures that follow the size convention are shaft 40 mm, housing 56 mm and height 8.00 mm. The Lx designation tells you the seal has a sealing lip backed by a spring, which is the arrangement used on lubricated rotating shafts. The lip runs against the shaft surface and holds the seal while the shaft turns. Before you install anything, measure both the shaft and the bore and compare them against these figures.

You will find this seal in centrifugal pumps, electric motors, speed reducers, compressors, machine tools and power transmission equipment. In each case the job is the same: hold oil or grease in and keep contaminants away from bearings and gears. Agricultural and industrial machinery with shafts turning at moderate speeds also uses this type of seal. The lip and spring material you select should match the fluid being sealed and the temperature at which the equipment runs.

Installation calls for a clean shaft with no burrs or scratches, and a light film of lubricant before the seal goes in. The housing bore needs the correct tolerance and no damage. Use a driver that presses on the outer diameter rather than the lip. If the shaft is worn, consider an offset lip or a repair sleeve. Shaft and housing must be aligned, since misalignment is a common cause of early leakage.

If you are looking for an equivalent, send the part number 5339Pol or simply your application dimensions. MR Industrial Accessories carries seals in a range of brands and materials, so we can match your equipment by size, fluid or operating conditions. We can also walk you through lip material options such as NBR, FKM and PTFE based on temperature and lubricant.