DBH 8121Pol radial shaft seal — 50.8 x 69.85 x 9.5

DBH 8121Pol 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 8121Pol and any equivalents.

Part number 8121Pol is a radial shaft seal from the DBH line. It presses into the housing and its lip rides on the rotating shaft, holding lubricant inside while keeping dust, water and particles out. The designation reads as a 50.80 mm shaft, a 69.85 mm housing bore and a 9.50 mm height, built to the Lz-R design with a main sealing lip plus an outer dust lip.

Reading the code is the quickest way to confirm a match. The first figure, 50.80 mm, is the shaft diameter the lip contacts. The second, 69.85 mm, is the housing bore the metal case seats in. The third, 9.50 mm, is the overall height. Lz-R tells you the seal has two lips: one works against the shaft to hold oil, the other faces outward to block contaminants. The elastomer turns with the shaft while the case stays put in the housing, so no extra sealing element is required.

You will find seals of this size in gearboxes, speed reducers, centrifugal pumps, electric motors and power transmission equipment, as well as in road and agricultural machinery and in process lines where a shaft turns inside an oil-filled crankcase. The job is the same everywhere: no lubricant escaping, no contaminants getting in to wear out bearings and gears.

Installation calls for a few checks. The shaft should be free of burrs and wear, and the housing clean and undistorted. Coat the lip with the oil or grease the equipment already uses, then seat the seal with a flat driver that pushes on the outer diameter, not on the lip. If the shaft has a deep groove, a seal with the lip in a different position may be the better choice.

Selection comes down to speed, temperature and the fluid in contact, so confirm those details before asking for a quote. If you are after an equivalent, send part number 8121Pol together with your shaft and housing diameters, and a photo of the old seal if you have one. We can compare options within the same series or from other brands we supply, and check whether the Lz-R design fits better than a single- or double-lip variant given the contamination in your equipment. Quotes are handled by WhatsApp or email with a prompt reply.