DBH 8720 radial shaft seal — 55.4 x 76.15 x 12.7

DBH 8720 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 8720 and any equivalents.

When a gearbox, pump or motor starts weeping oil around a rotating shaft, the DBH 8720 radial shaft seal is one of the sizes maintenance teams reach for. Its Mx construction pairs a sealing lip with a metal outer body that presses into the housing bore, so it both keeps lubricant in and keeps dust, water and particles out. The dimensions are shaft 55.40 mm, housing 76.15 mm and height 12.70 mm, which suits assemblies with limited axial room.

Reading the designation helps when you are matching a part. The 8720 code belongs to the DBH oil seal line, and the three figures that follow it in a catalog entry always run in the same order: shaft first, then housing bore, then width. For this seal that means 55.40 mm on the shaft, 76.15 mm in the cavity and 12.70 mm of installed width. The Mx label describes how the seal is built rather than its size, so two seals with identical dimensions can still differ in construction.

In service, the lip rides against the rotating shaft while the outer diameter holds in the bore with interference, which is what stops leakage past the housing. You will find this size in gearboxes, centrifugal pumps, electric motors, transmission shafts and continuous process equipment. In every case the job is the same: hold the oil or grease inside and block contamination from outside. It shows up most often where shaft speed is moderate and operating temperature stays within what the elastomer can handle, and it is a routine item on preventive maintenance schedules.

Before ordering, confirm the three dimensions against the actual shaft and bore, since a close-but-wrong size will not seat or seal. The shaft surface should be smooth, with no burrs, scratches or heavy wear, because a rough journal shortens lip life. Coat the lip with the same oil used in the equipment when you install it, keep it square during pressing, and do not strike it or fit it backwards. The lip has to face the fluid it is retaining. If the bore is worn or out of round, fix that first.

If you want a cross-reference for the DBH 8720, send the complete code along with the shaft, housing and height measurements, plus a photo of the removed seal if you have one. From that we can check alternatives from other manufacturers or confirm whether the Mx configuration fits your service conditions. We can also flag whether the original part used a coating or a special elastomer worth carrying over to the replacement.

Quotes are handled by part number: message the code to MR Industrial Accessories on WhatsApp or by email, and the team responds quickly with replacement options. If you are unsure about selection or installation, our technical staff can review the application with you before you commit to a part. This brand sits within our broader line of seals and oil seals for industrial maintenance.