Radial shaft seal DBH 8721 — 40.00 x 55.00 x 8.00

DBH 8721 is a radial shaft seal reference, within Seals. Request a quote for 8721 via WhatsApp or email with the quantity you need; we respond promptly with lead time and equivalents.

The DBH 8721 radial shaft seal is a lip seal mounted between a rotating shaft and a fixed housing to retain lubricant and block the entry of dust, water or particles. Its dimensions of 40.00 mm shaft, 55.00 mm housing and 8.00 mm height place it in a medium-size application, common in pumps, gearboxes and power transmission equipment. MR Accesorios Industriales supplies this DBH reference for industrial replacement and maintenance.

This item is a seal from the DBH line, identified by the code 8721. According to the product data, it corresponds to a shaft of 40.00 mm diameter, a housing of 55.00 mm and a total height of 8.00 mm. The indicated design is Lx-Bidi, that is, a sealing lip with a bidirectional configuration, intended to contain lubricant from both directions of rotation or for applications where the internal pressure can reverse. The 8721 designation groups these standardized dimensions within the DBH catalogue.

Typical applications for a seal of this size include gearboxes, centrifugal pumps, electric motors, rollers and belt or chain drive equipment. In all cases it serves to close the lubrication chamber and prevent oil or grease from migrating outward, while at the same time stopping the ingress of contaminants. It is also used on shafts of mixers, fans and conveyors where there is continuous rotation and exposure to environmental dust.

To correctly select a seal, you must verify the shaft diameter, the housing diameter and the available height. In this case, the values are 40.00 mm, 55.00 mm and 8.00 mm respectively. It is important that the shaft has adequate hardness and surface roughness, with no burrs or marks, and that the housing has the entry chamfer so as not to damage the lip during installation. Pre-lubricating the lip and using a flat installation tool help prevent deformation.

If you need a nearby size or an equivalent from another brand, the most practical thing is to send us the code 8721 or the dimensions 40 x 55 x 8 mm via WhatsApp. With that data we can look for alternatives within the same radial shaft seal category, respecting the Lx-Bidi design or evaluating a compatible replacement. We can also advise you if the housing or the shaft have tolerances outside the usual range, so that the seal works under correct conditions.

MR Accesorios Industriales supplies the DBH brand as part of its line of seals and radial shaft seals. If this seal is for a one-off repair or to keep a piece of equipment running, send us the code 8721 via WhatsApp and we will send you a quote. We can also help you identify the seal from the shaft and housing dimensions if you do not have the reference at hand.