Radial shaft seal DBH 6645 — 40.00 x 80.00 x 12.00

DBH 6645 is a radial shaft seal reference, within Seals. Request a quote for 6645 via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

The DBH 6645 oil seal is a single-lip radial seal that mounts on the shaft and closes against the housing to retain lubricant and block the entry of dust, water or particles. With 40.00 mm shaft, 80.00 mm housing and 12.00 mm height, it is a commonly used size in gearboxes, pumps and power transmission equipment. MR Accesorios Industriales carries it as part of its line of seals and radial shaft seals.

This item is a DBH radial shaft seal with designation 6645, with a shaft diameter of 40.00 mm, housing diameter of 80.00 mm and height of 12.00 mm. The Lz design corresponds to a single sealing lip with spring, intended for rotating shafts with permanent lubrication. The elastomeric lip bears on the shaft and the outer diameter fits into the housing by interference, so the seal remains fixed to the housing while the shaft rotates. That combination is what defines its function: containing the oil or grease and, at the same time, acting as a barrier against external contamination.

Typical applications for a seal of this size appear in gearboxes, gearmotors, centrifugal pumps, mixers, drive shafts and process equipment with a 40 mm shaft. It is also found in machine tools, conveyors and equipment in the food or chemical industry, where shaft sealing is critical to prevent lubricant loss and contamination-related downtime. In all those cases it works alongside bearings or bushings that share the same shaft, so the condition of the seal directly affects the service life of the assembly.

To select it, verify that the shaft diameter, housing diameter and height match those of the machined housing. Check the condition of the shaft surface: a scratched, worn or burred shaft ruins the lip within a few hours of operation. During installation, lubricate the lip with the same grease or oil used in the equipment, insert it perpendicular to the shaft and apply force on the outer diameter, never on the lip. If the previous seal failed, it is advisable to check concentricity, operating temperature and internal housing pressure before replacing it.

If you need an equivalent or a nearby size, send us the part number 6645 along with the shaft and housing dimensions, and a photo or sketch of the old seal if you have it on hand. With that data we can locate the exact size within the DBH line or find a compatible alternative in another of the brands we carry. We can also guide you if the housing is worn and it is worth evaluating a seal with an oversized outer diameter or a repair sleeve.

MR Accesorios Industriales carries the DBH brand as part of its line of seals and radial shaft seals. If you already have the part number 6645 or the size 40 x 80 x 12 mm, write to us by WhatsApp and we will send you the quote with the technical information you need to confirm the replacement.