SKF 15X21X3 HM4 V radial shaft seal

SKF 15X21X3 HM4 V 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 15X21X3 HM4 V and any equivalents.

Part of the SKF radial shaft seal range, the HM V series uses a single lip with a metal case and elastomer body to hold lubricant in and keep contaminants out of rotating shaft assemblies. Gearboxes, pumps, electric motors and power transmission equipment are the usual places these seals show up. Because the profile is compact, it fits into spaces where a larger seal would not go, and the contact lip handles wear and temperature reasonably well. MR Industrial Accessories LLC supplies this line for maintenance and replacement work.

Reading the code is the quickest way to confirm you have the right part. Take 15X21X3 HM4 V: the first three numbers give shaft 15 mm, outside diameter 21 mm and width 3 mm. HM4 tells you which elastomer compound is used, and the trailing V describes the lip geometry, a profile built to pump and seal at higher shaft speeds. Order by the full designation printed on the old seal or called out on the drawing, since a single character can change the part.

These seals turn up in food processing, chemical plants, petrochemical sites and general manufacturing. Electric motors, centrifugal pumps, gear reducers, mixers and conveyors all rely on them to keep oil or grease where it belongs while blocking dust and water. The small cross-section suits cramped housings, and the HM4 elastomer stands up to mineral oils and moderate temperatures.

Selection comes down to three measurements: shaft diameter, housing bore and the width you have room for. The lip needs a ground, lubricated surface to run against, so avoid splined or rough shafts. Press the seal in with a proper tool rather than hammering it, keep the spring facing the fluid side, and lubricate the lip before startup. Alignment and that first lubrication go a long way toward how long the seal lasts.

Since radial shaft seals are sized by dimensions and lip type, similar parts exist across several manufacturers, but elastomer compounds and lip designs are not identical. Match the service conditions, not just the numbers on the box. If anything is unclear, send the original part number and our team will help you sort out the right option.