National 455437 Oil Seals , Oil Seal, 2.8" ID, 4.0" OD, 0.5" Width, Nitrile Material

The National Oil Seal 455437 is a crucial component in various mechanical systems, primarily designed to prevent the leakage of lubricants and fluids in machinery and automotive applications. This oil seal is constructed predominantly from nitrile material, known for its excellent resistance to oils, fuels, and high temperatures. Nitrile seals are widely recognized in the industry for their durability and performance reliability under demanding conditions. With an inner diameter of 2.8 inches, outer diameter of 4.0 inches, and a width of 0.5 inches, the National 455437 oil seal is engineered to fit a range of applications, ensuring a snug fit that mitigates the risk of fluid leaks. The National Oil Seals are essential in various industries including automotive, aviation, and heavy machinery. They serve the vital purpose of protecting internal components against contamination, thus enhancing the longevity and efficiency of equipment. Key features of the National Oil Seal 455437 include its robust construction, ease of installation, and compatibility with numerous machinery types. Its design aids in facilitating smooth operation while effectively sealing against dust, dirt, and moisture.

Manufacturer: National, the oil seal and bearing brand now published by Timken (formerly Federal-Mogul). Part Number: 455437 Product: Radial shaft oil seal PUBLISHED DIMENSIONS, TIMKEN NATIONAL INDUSTRIAL SEALS CATALOG In Timken's numerical listing, National 455437 interchanges to current National part number 415437, which is listed as: Shaft Diameter: 3.500 in. Bore Diameter: 4.751 in. to 4.756 in. Width: 0.500 in. Seal Type Code: S Illustration Type: 41 The closely numbered variant 455437N is separately listed with the same envelope, shaft diameter 3.500 in., bore diameter 4.751 in. to 4.756 in., width 0.500 in., illustration type 45, but with type code N. MATERIAL Per Timken's material letter code table, seal type code S denotes NITRILE and type code N denotes POLYACRYLATE. Part number 455437 carries no N suffix and maps to the type S (Nitrile) listing. Timken's material selection table gives Nitrile a service range of -40 F to 225 F, noting low cost and good low temperature capability but that it does not have excellent heat resistance. A fluoroelastomer (Viton) option carries the letter code V on part numbers where it is offered. DIMENSION DISCREPANCY, FLAGGED FOR REVIEW: this record's title states an inside diameter of 2.8 in. and an outside diameter of 4.0 in. Those figures do not agree with Timken's published listing, which gives a 3.500 in. shaft diameter and a 4.751 to 4.756 in. bore diameter. Only the 0.500 in. width agrees. The catalogue figures above are the published ones. The seal should be measured before the title dimensions are relied upon. UNPUBLISHED / NOT STATED HERE: spring type, lip count and the detailed cross-section geometry beyond the illustration type reference, and the maximum shaft surface speed for this specific size. Timken publishes these by illustration type and application rather than per part number, so no figure is adopted here. Spec Basis: Timken "National Industrial Seals Catalog", catalog number 7707 - numerical size listing (entries for 415437 and 455437N), interchange listing (455437 and 455437N both referencing National 415437), and the seal material letter code and material selection tables (S = Nitrile, N = Polyacrylate, V = Fluoroelastomer). No aftermarket or reseller figures have been used.