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Bearing Units with Ductile Cast Iron Housing

Ductile SeriesThe NTN ductile series helps with design optimization!


Housing weight is reduced by 40%, with a compact design

When compared with the standard NTN housing the ductile series housing enjoys a 40% weight reduction . Additionally the housing is useful for a size reduction in machine equipment. This is achieved by minimizing as much as possible non-critical dimensions of the housing allowing the housing to be placed in tight locations.

High fracture strength of housing

Spheroidal graphite cast iron is used for the bearing housing. It is designed to have high strength with fine material structure and uniformed thickness. The average fracture strength for the series is increased by approximately. 30% when compared with NTN’s standard product (FC200, Gray cast iron).

Two lubrication types : Relubricatable type maintenance free type

The relubricatable type is suitable for high temperature and high speed application, and the maintenance free type is optimized for a long period under normal using conditions without re-greasing.


This series is interchangeable with NTN standard product and other domestic suppliers’ product. This is achieved by keeping the dimensions related to mounting the same as for standard product made according to JIS B 1559 (Housings for rolling bearing units).


Bearing Units with Ductile Cast Iron Housing (PDF: 616KB)