Page 2 of Bearing Units Plastic Housing Series by NTN Corporation Japan

the ntn plastic series ensures a clean operating environment 1 features guards against corrosion maintains a clean operating environment low torque characteristics light weight water resistant 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 the solid grease lubricant in the ball bearing solely developed by ntn reduces ntn leakage from the bearing significantly reducing environmental pollution also the housing will not stain nor is there paint to peel and contaminate the environment the standard solid grease type for these ball bearing units is spot-pack which places the lubricant on the bearing cage torque consumption capabilities of spot-pack bearings is low due to reduced whip resistance in comparison to standard grease lubricated ball bearings weight is reduced more than 30 to 60 over standard series units the glass filled polyester housing not only reduces corrosion but offers better water resistance 2 materials parts raceways rolling element bearing slinger cage rubber seal set screww shape screw head housing bearing housing sleeve for set bolt nut for grease nipple dust cover plug valox is a trade mark of general electric company materials martensite stainless steel equivalent to sus440c martensite stainless steel sus440c austenite stainless steel sus304 nitryl rubber martensite stainless steel sus410 glass reinforced polyester valox 420 austenite stainless steel sus 304 austenite stainless steel sus 304 polypropylene polyethylene 3 recommended operating temperature and allowable speed bearings with solid grease are recommended to operate under -20 to +80°c however operating temperature should be below +60°c when bearing is operated with continuous use dn value 12 104 dn bore diameter in mm speed in min-1 remarks the recommended operating temperature range and allowable speed is applied to all bearings with solid grease contact ntn when your application exceeds these recommendations for standard grease the maximum recommended temperature for plastic units is 80°c to prevent creeping between bearing outer ring and housing bore 4 compatibility and handling basically the plastic housing series is compatible with standard cast iron series units when setting however the nominal setting bolt diameter may differ from the standard series the housing should be handled carefully and may be damaged if dropped on hard surfaces or hit with metal hammers an electrostatic charge may be generated in certain operating conditions making it inadvisable for use when flammable or explosive conditions may occur the unit may be regreased using the plug on the housing however relubrication is not recommended when unit ball bearings are packed with solid grease 5 applications bearings with solid grease are suitable for applications requiring a clean operating environment such as food processing and packaging machinery chemical processing machines etc 6 option when a stainless steel insert bearing is not required a standard steel insert bearing can applied in that case a relubricable type will be provided contact ntn for additional information 1

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