DBH 5270 radial shaft seal — 30 x 40 x 7

DBH 5270 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 5270 and any equivalents.

The DBH 5270 is a radial shaft seal built to keep lubricant in and contamination out of rotating equipment. Its designation 5270 corresponds to a 30 mm shaft, a 40 mm housing bore and a 7 mm width, with the Lz design. Because it is a wear part, it is normally replaced once leakage or dirt ingress shows up. MR Industrial Accessories supplies this brand and can help you confirm the correct reference for your machine.

Reading the code helps when you are comparing a seal on the bench with what is listed in a manual. In this reference, the shaft runs at 30 mm, the housing bore measures 40 mm and the overall width is 7 mm. The Lz design identifies a single lip with a spring, a common choice for rotating shafts that run with lubrication. The lip rides against the shaft and forms the sealing barrier, while the outer body stays seated in the bore and holds the seal in position.

You will find this type of seal in gearboxes, pumps, electric motors, transmission shafts and other process equipment where a shaft passes through a housing. It also shows up in areas exposed to dust, wash water or chips, as long as the seal has been selected for that service. In those spots, the exclusion lip is what keeps contamination away from the lubricant and helps protect the bearings and bushings nearby.

During installation, inspect the shaft for burrs or deep marks and make sure the bore is clean and not deformed. Put a light film of lubricant on the lip before sliding the seal into place, and avoid hitting it with tools. Peripheral speed, working temperature and the fluid being retained all influence the selection, so if those values are not defined it is worth checking with a specialist before installing. The 7 mm width and Lz design belong to this specific reference.

If you need an equivalent, send the complete part number along with the shaft and bore dimensions, and a photo of the old seal if you have one. With that information we can search within the same category or subcategory, or across other brands we carry, for something that does the same job. Do not substitute a seal just because the sizes look close: a single millimeter of difference on the shaft can lead to leaks or an overly tight fit.