Trailer Seal 21333 - 2.125 ID x 3.37 OD

Trailer Wheel Seal 21333

The 21333 trailer wheel seal is usually found on the 1-3/4 x 1-1/16 spindle in either a 6 lug or an 8 lug trailer hub, however, it is a more uncommon seal.  This trailer grease seal is made of the standard metal body with the double lip rubber seal.  Colors may vary from blue, green, or beige on the outer metal. 

Seal Inside Diameter:  2.125"

Seal Outside Diameter: 3.37"

Typically used with inner bearings 25580

Seal Number Cross Reference

Transcom Number 21333

National Number 440972

NOK Number AF7172E1

Dexter Number 010-001-00

Chicago Rawhide Number 21352

Trailer wheel seals are an integral part of a well operating trailer hub.  Trailer seals are installed in the back of the hub and seal to the section of the spindle that works to keep the wheel bearing grease or oil in a trailer hub, prevents water and dirt from entering the hubs which could cause bearing failure.  Therefore, it is extremely important to inspect your trailer seals regularly.  Grease or oil leaking past the seal seat or grease on the back of your trailer rim is a sign of a worn, torn, or old seal and must be fixed to prevent damage to the trailer hub or the trailer axle.