DBH 8657 radial shaft seal — 27 x 43 x 9

DBH 8657 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 8657 and any equivalents.

When a shaft seal begins to weep, the replacement decision usually comes down to three measurements and the seal design. The DBH 8657 is a radial lip seal built for a 27.00 mm shaft, a 43.00 mm housing bore and a 9.00 mm height, with the Lx configuration: a single lip backed by a spring. That combination covers many pumps, motors, gearboxes and transmission units where a compact seal is required. MR supplies this brand and can help you confirm the size or find a match from the lines we carry.

The part number breaks down simply: 8657 identifies the seal within the DBH line, and the three figures that matter for fit are shaft 27.00 mm (d), housing bore 43.00 mm (D) and height 9.00 mm (h). The Lx design means one elastomeric lip with a spring, running against a rotating shaft that is lubricated. The metal outer case presses into the housing bore, while the lip contacts the shaft surface. Because it is a wear part, a lip that has hardened, cracked or started passing oil should be changed before the leakage reaches bearings or gears.

Seals in this size range show up in centrifugal and gear pumps, low and medium power electric motors, gear reducers, drive shafts, mixers and process equipment. Machine tools, compressors and hydraulic systems also use them where lubricant has to stay on one side and contamination on the other. The job is always the same: hold oil or grease in, keep dust, water and particles out, and protect the bearings and bushings behind the seal from accelerated wear.

Installation calls for a few checks. Confirm the shaft diameter is within tolerance and free of burrs, and that the housing bore has the correct finish and concentricity. Put a light film of lubricant on the lip before fitting, and press on the metal case with a proper installation tool rather than on the lip. If the shaft already shows a worn track, a seal with the lip positioned differently may be a better choice. Speed, temperature, lubricant type and system pressure all influence which seal works best.

If you are looking for an equivalent, send part number 8657 together with the shaft, housing and height measurements, and a photo of the old seal if available. The number stamped on the seal or the equipment drawing is also useful. With that information we check alternatives in the same brand or in other lines we carry, keeping the dimensions and design type consistent. Where there is room, a double-lip seal or one with a dust guard can be considered.

MR supplies seals alongside bearings, power transmission components and lubricants. To request a quote for the DBH 8657 oil seal or to ask about a matching size, send the part number and dimensions on WhatsApp or by email. We will come back with the option that fits your equipment.