DBH 9978/85 radial shaft seal — 31 x 44 x 8.5/4

DBH 9978/85 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 9978/85 and any equivalents.

When a rotating shaft passes through a housing, lubricant has to stay inside and contaminants have to stay out. The DBH 9978/85 radial shaft seal handles that job. Its A 192 design and its 31 mm shaft, 44 mm housing and 8.50/4.00 mm height suit spots where axial room is tight and a dependable barrier is required. MR Industrial Accessories supplies it within its seals and oil seals range for maintenance and repair work.

Reading the number helps with selection. The 9978/85 designation identifies this seal, while A 192 describes the lip and metal body arrangement: a sealing lip on a metal case that presses into the housing bore. The two height figures, 8.50/4.00 mm, mean the mounting section and the lip section are not the same thickness, which is typical of low-profile installations. Shaft diameter is 31 mm and housing bore is 44 mm.

Typical service includes gearboxes, pumps, electric motors, drive shafts and process equipment, where the seal keeps oil or grease from escaping and blocks dust or water before it reaches the bearing. Agricultural, road and material handling machinery also uses this type of seal to shield bearings and bushings from outside contamination. It works against a machined shaft and a housing whose surface finish lets the lip seat evenly.

During installation, inspect the shaft for burrs or marks and make sure the housing is clean and undistorted. Coat the lip with the same lubricant used in the equipment, then drive the seal in with a tube or shim that contacts the outer diameter only, never the lip. If the shaft shows wear at the contact area, a seal with an offset lip is worth considering. Speed, temperature and lubricant type should be checked against the manufacturer's data sheet before confirming the choice.

For an equivalent or another size, send part number 9978/85 with the shaft and housing dimensions, plus a photo of the old seal if available. That is enough for us to search the DBH line or other brands we carry. We can also advise when the housing has a shoulder or when axial space is critical, so the seal does not end up mounted out of position.

MR Industrial Accessories serves customers across the United States, Canada, Mexico and South America. Quotes for this seal are handled by WhatsApp or email using the part number 9978/85, and our team can suggest equivalents and help with selection.