DBH 5121 radial shaft seal — 15 x 35 x 10

DBH 5121 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 5121 and any equivalents.

When you need to replace a leaking seal on a rotating shaft, the DBH 5121 radial shaft seal is a standard size to keep in mind. It measures 15.00 mm at the shaft, 35.00 mm at the housing and 10.00 mm in height, and its Lx design means a single lip with a spring. MR Industrial Accessories supplies this seal as part of its seals and oil seals line.

The DBH 5121 is identified by part number 5121. The three dimensions that define it are the shaft diameter (d) at 15.00 mm, the housing bore (D) at 35.00 mm, and the height (h) at 10.00 mm. The Lx designation refers to a single-lip seal with a spring, made for rotating shafts that run with lubrication. The elastomer lip rides against the shaft while the spring keeps steady contact pressure; the outside of the seal is held by an interference fit in the housing. Its job is to keep oil or grease on one side and keep dust, water and particles out on the other.

You will find seals of this size in gearboxes, pumps, electric motors, drive shafts, rollers and other motion equipment. In food, chemical or process plants, the elastomer is selected based on the fluid being sealed and the operating temperature. On older or imported machines, the oil seal is often the first part to be replaced when a lubricant leak shows up or when contamination starts reaching the bearing. It can also serve as a secondary barrier in assemblies that already have a main seal.

Before installing a radial shaft seal, confirm three things: the shaft diameter is within tolerance, the housing bore is free of burrs or scratches, and the seal height matches the housing depth. Lubricate the lip before pressing it in, and use a tube of the correct diameter to seat it squarely. Never strike the seal directly. If the shaft is worn or has a visible groove, consider a seal with the lip in a different position or a repair sleeve. Elastomer choice depends on the fluid, the temperature and the peripheral speed.

If you need an equivalent from another brand or a seal with different dimensions, send part number 5121 or the shaft, housing and height measurements. A photo of the old seal or the assembly drawing also helps. We cross-check the designation against the manufacturer's data and suggest alternatives in the same category. If the Lx design is not right for your application, we can point you to the lip type or material that fits better.

To request a quote for the DBH 5121 oil seal, contact us by WhatsApp or email with part number 5121 and the dimensions. We will reply with the options in our seals and oil seals line. MR Industrial Accessories works with industrial brands and supports the technical selection of each part.