DBH 1109 radial shaft seal — 121.03 x 177.77 x 31.75

DBH 1109 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 1109 and any equivalents.

Part number 1109 belongs to the DBH line of radial shaft seals, a lip-type seal that keeps lubricant inside the assembly and keeps contaminants out. Its geometry is defined by a 121.03 mm shaft diameter, a 177.77 mm housing diameter and a 31.75 mm height, together with the A 247 design. MR Industrial Accessories supplies this brand and helps maintenance teams confirm the correct seal for the job.

Reading the designation is the first step. The three figures follow the usual order: shaft first, housing second, height last, so the seal measures 121.03 mm at the shaft, 177.77 mm at the bore and 31.75 mm across. The A 247 code describes how the lip and the outer case are built, which is what determines how the seal behaves once it is running. Because tolerances here are tight, the shaft and the cavity should be measured before installation; even a small mismatch will show up as a leak.

Typical locations for a seal of this type include gearboxes, pumps, electric motors, rollers and other power transmission equipment. Its job is twofold: hold oil or grease in place and block dust, water and metal chips from reaching the interior. Where the plant environment is dirty or damp, a healthy seal is what keeps bearings and gears from wearing early and what keeps unplanned downtime off the schedule.

Selection comes down to three measurements plus the design code. Check the shaft diameter, the housing bore and the height available, then confirm that the A 247 configuration suits the application. Depending on how it is built, this design may combine a main sealing lip with a secondary exclusion lip, so mounting orientation and shaft rotation direction are worth reviewing before the part goes in. Lubricate the lip with the same oil the equipment uses, keep the seal square during fitting, avoid impact, and inspect the shaft for burrs, scoring or out-of-round wear. A rough or worn shaft surface is a common cause of early leakage.

If you are replacing a DBH 1109, the fastest route is to send the full part number along with the shaft, housing and height measurements, and a photo of the old seal if one is available. With that information we can review options in the same brand or in other lines we carry, keeping the critical dimensions unchanged. Where a direct match is not possible, we can also advise on how a compatible replacement should be evaluated.

Quotes are handled by part number through WhatsApp or email at MR Industrial Accessories. Send the reference and the dimensions and the team will come back with the options that suit your equipment, and can suggest equivalents or help you choose when the original is hard to identify.