DBH 6778 radial shaft seal — 41 x 56 x 10

DBH 6778 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 6778 and any equivalents.

A radial shaft seal from the DBH line, the DBH 6778 keeps lubricant where it belongs and keeps dust, water and particles out of the bearing cavity. It fits a 41 mm shaft in a 56 mm housing bore with a 10 mm width, and it uses the Mz lip configuration. Treat it as a wear item: once the lip stiffens or shows marks, oil starts to escape and the seal should be changed before the bearing is damaged.

Sizing is straightforward: shaft 41 mm, housing 56 mm, width 10 mm. The 6778 number identifies this particular size and design inside the DBH range, and the Mz designation tells you it is a single-lip seal with a spring that rides against the rotating shaft. Measure the shaft and the bore before installing anything, since a seal of a different diameter or width will leak even when it looks like it seats properly.

You will find this seal in gearboxes, pumps, electric motors, transmission shafts and process equipment where oil has to stay separated from the surrounding environment. It also shows up on conveyors, agricultural machinery and plant equipment exposed to dust or water. The job is the same everywhere: hold the lubricant in, keep contamination out, and reduce unplanned downtime caused by leaks.

When specifying a replacement, dimensions alone are not the whole story. Shaft speed, operating temperature and the fluid being retained all affect how the seal performs. The spring-loaded Mz lip suits rotating shafts under permanent lubrication. During installation, coat the lip with lubricant, check that the shaft has no burrs or splines, and press the seal in square to the shaft rather than driving it in at an angle. A groove worn into the shaft contact area will defeat a new lip, so a wear sleeve may be the better route.

If 6778 is not the exact code you need, send the shaft, housing and width measurements along with the fluid type and a photo of the old seal. With that information the team can locate an equivalent in DBH or another brand at the same size, and can also work with you if the shaft or bore sits at a tolerance. The more detail you provide, the faster a correct alternative comes back.