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

DBH 8439 is a reference of radial shaft seal, within Seals. Request a quote for 8439 via WhatsApp or email with the quantity you need; we respond promptly with the quote and equivalents.

The DBH 8439 oil seal is a single-lip radial seal that fits on a 25 mm shaft and inside a 47 mm housing bore, with a height of 8.00 mm at the body and 10.50 mm at the lip. Its function is to retain lubricant inside the assembly and stop the entry of dust, water or particles. It is used in gearboxes, pumps, electric motors and power transmission equipment operating with continuous rotation.

This oil seal is identified by its 8439 designation and by the A 135 design. There are three dimensions you must verify before ordering it: shaft diameter 25 mm, housing bore diameter 47 mm and height 8.00/10.50 mm. That double height indicates an 8.00 mm body with a lip that protrudes up to 10.50 mm, intended for housings with a recess or to improve contact on the shaft. The lip is made of elastomer and the outer reinforcement is metal, which gives it rigidity during installation.

Typical applications are input and output shafts of gearboxes, centrifugal pumps, electric motors, conveyor rollers and belt- or chain-driven transmission equipment. In all these cases the seal runs against a rotating shaft and a stationary housing, and its service life depends on the shaft surface being polished, free of burrs and machining marks. It is also used as a secondary barrier in grease housings and in assemblies where there is oil splash.

To select it properly, always compare the three dimensions with the actual housing: if the shaft diameter does not match, the lip will not seal; if the outer diameter is too small, the seal will spin inside the housing. The 8.00/10.50 mm height lets you replace 8 mm or 10 mm seals depending on how the seat is machined. When installing it, 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 quote the 8439 code, send us the dimensions of your old seal — shaft, housing bore and height — and the type of fluid it seals. With that data we will look for the equivalent in the DBH line or in another brand we carry. We will also confirm whether a double-lip seal or one with a dust lip is better if the equipment operates with a lot of dust. The idea is that you do not buy blindly: first we confirm the size and then we quote.

MR Accesorios Industriales carries the DBH brand. If you already have the 8439 code on hand, send it by WhatsApp along with the quantity and we will reply with the quote. If you are unsure about the size, send a photo of the seal and the shaft and housing bore dimensions: we will verify it against the manufacturer's data sheet before sending you the quote.