DBH 8439 radial shaft seal — 25 x 47 x 8/10.5

DBH 8439 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 8439 and any equivalents.

The DBH 8439 is a single-lip radial shaft seal designed for a 25 mm shaft and a 47 mm housing bore. Its body height is 8.00 mm, and the lip extends to 10.50 mm. This seal keeps lubricant in and contaminants out in gearboxes, pumps, electric motors, and other rotating equipment.

You identify this seal by the 8439 code and the A 135 design. Before ordering, check three dimensions: shaft 25 mm, housing bore 47 mm, and height 8.00/10.50 mm. The dual height means an 8.00 mm body with a lip that reaches 10.50 mm—useful for recessed housings or to improve shaft contact. The lip is elastomer, and the outer case is metal, giving it rigidity during installation.

Common uses include input and output shafts of gearboxes, centrifugal pumps, electric motors, conveyor rollers, and belt- or chain-driven transmission equipment. In these setups, the seal runs against a rotating shaft and a stationary housing. Its service life depends on a polished shaft surface free of burrs and machining marks. It also serves as a secondary barrier in grease housings and splash-oil assemblies.

For proper selection, compare all three dimensions with the actual housing. A mismatched shaft diameter means the lip won't seal; an undersized outer diameter lets the seal spin in the housing. The 8.00/10.50 mm height allows replacement of 8 mm or 10 mm seals depending on the seat machining. During installation, lubricate the lip with the same grease or oil used in the equipment, seat the seal squarely, and tap on the metal edge—never on the lip.

To request a quote for the 8439 code, send the dimensions of your old seal—shaft, housing bore, and height—and the fluid it seals. We'll find the equivalent in the DBH line or another brand we carry. We can also confirm if a double-lip or dust-lip seal is better for dusty conditions. This way, you don't buy blindly: we confirm the size first, then quote.

MR Industrial Accessories supplies the DBH brand. If you have the 8439 code, send it via WhatsApp with the quantity and we'll reply with a quote. If unsure about the size, send a photo of the seal and the shaft and housing bore dimensions. We'll verify against the manufacturer's data before quoting.