Bearing Units Series

■Superior Housing Strength

Made of precision gas cut rolled steel, NTN steel housings offer superior strength characteristics when compared to cast iron and cast steel housings.

■Consistent Microstructure

The rolled steel microstructure is more consistent than cast iron or cast steel, reducing the risk of housing fracture under severe conditions.

■Interchangeability

Rolled steel housing dimensions are consistent with cast units, allowing them to be interchanged with NTN standard housings and other manufacturers ISO standard.

■Guards against corrosion

NTN bearing units in the stainless series feature ball bearings inserted into housings made of stainless that provide superior resistance to corrosion as compared to standard series cast iron units. This series is especially useful in a wide variety of applications because of the rust free properties of the housing.

■Longer lubrication life

The solid grease lubricating the bearing has been heat-hardened and is a mixture of lubricant and ultra high moleculer weight polyethylene. The solid grease reduces leakage, prolonging lubricant life especially when used under conditions of vibration or centrifugal force. Also, this grease will not homogenize when water penetrates into the bearing raceway.

■Maintains a clean operating environment

The solid grease lubricant in the ball bearing, solely developed by NTN, reduces leakage from the bearing, significantly reducing environmental pollution.

■Interchangeability

The basic dimensions are the same as current NTN units and are also compatible with units from other manufacturers ISO standard.

■Guards against corrosion

NTN bearing units in the plastic series feature ball bearings inserted into housings made of plastics that provide superior resistance to corrosion as compared to standard series cast iron units. This series is especially useful in a wide variety of applications because of the nonmagnetic and rust free properties of the housing.

■Maintains a clean operating environment

The solid grease lubricant in the ball bearing, solely developed by NTN, reduces leakage from the bearing, significantly reducing environmental pollution. Also, the housing will not stain, nor is there paint to peel and contaminate the environment.

■Light weight

Weight is reduced more than 30% to 60% over standard series units.

■Water resistant

The glass filled polyester housing not only reduces corrosion but offers better water resistance.

■Better dustproofing and waterproofing ensure a longer bearing life.

Triple-sealed bearings feature a secure bearing seal with three lips. This special seal offers reliable dustproofing and waterproofing superior to those of standard bearings used in bearing units. In addition, it ensures a longer service life, even when exposed to heavy airborne dust and splashes of foul water.

■Reduces maintenance cost.

A bearing life longer than that of a standard bearing unit configurations means extended maintenance intervals, greatly reduced maintenance costs (of inspection, relubrication, replacement, etc.), and increased availability of machinery.

■Decreases price of the bearing unit and contributes to more compact machinery.

The triple-sealed bearing unit replaces conventional covered bearing units in certain operating conditions, greatly decreasing the cost of bearing units. In addition, if the cover is not required, the machinery can be made more compact.

■Secure balled setscrew

The triple-sealed bearing is mounted on the shaft with NTN's unique balled setscrew, which features an embedded ball in its tip. Compared with knurled cup point or cup-point setscrews, the balled setscrew provides much greater resistance to loosening, as it does not readily loosen due to vibration or impact.

■Interchangeability

The triple-sealed bearing unit conforms to the JIS (Japanese Industrial Standard) for UC-type bearings. It is not only ready to use as a relubricable bearing, but it also replaces the conventional bearing units of NTN and other manufacturers. It therefore serves as a ready replacement for existing bearing units.

■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.

■Interchangeability

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).