DBH 8366/85 radial shaft seal — 21 x 39.6 x 10

DBH 8366/85 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 8366/85 and any equivalents.

The DBH 8366/85 is a radial shaft seal that keeps oil or grease where it belongs: inside the assembly, around a turning shaft. Its three key measurements are shaft 21.00 mm, housing 39.60 mm and height 10.00 mm, and it comes in the Lz design. It presses into covers, boxes and housings, holding lubricant in while keeping dust, water and particles out. Treat it as a wear part: once it starts weeping, the fix is a new seal of the same size.

The code breaks down simply. DBH identifies the seal line, 8366/85 is the item designation, and Lz is the construction variant the manufacturer assigns to this seal, which uses a sealing lip. The three numbers that matter for fit are d = 21.00 mm at the shaft, D = 39.60 mm at the housing, and h = 10.00 mm. Elastomer compound and spring type are confirmed against the manufacturer's data sheet when you request your quote.

You will find this seal wherever a shaft passes through a lubricant-filled housing: electric motors, reducers, pumps, gearboxes, mixers and machine tools. It also shows up on rollers, conveyors and transmission shafts running on grease. In each case it does two jobs at the same time, holding lubricant in and blocking contaminants from outside, which helps bearings and gears reach their expected service life.

Matching it starts with the three dimensions. Measure the old seal or the shaft and bore, then compare against 21.00 mm, 39.60 mm and 10.00 mm. The shaft should be clean, with no burrs or wear marks in the contact zone, and the housing should be free of deformation. Lubricate the lip before installation, seat the seal square to the bore, and press it in evenly. If the shaft shows grooving, consider a seal with the lip in a different position or a wear sleeve.

Have code 8366/85 ready? Send the dimensions of the seal you are replacing, shaft, housing and height, along with a photo of the part. From there we can locate the equivalent within the same DBH line or in another brand we supply. If the seal sits over a bearing, we can also tell you whether both are worth replacing in the same job.