Aerospace Intro
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SmithAircraft Bearings presented inthis section have been designed tomeet the standards of the aerospaceindustry and conform to military andother appropriate national standards. When selecting these bearings for yourapplication, it is recommended that youreview the engineering data provided, along with any appropriate military or national specifications. YAF (MS21438)& YAT (MS21439) YAF and YAT Series Yoke Type bearings have heavy outer ring sections and were designedfor application as track rollers where the bearing O.D. is unsupported. These bearings will support heavy rolling or oscillating loads in cam or trackroller applications. The YAF-Series (single row) needle bearings have a crowned outer race. The Smith Bearing YAT-Series (double row) needle bearings havelarge blended outside corner radiuses to helpdistribute stresses. The outer race is hard-chromeplated and all other exposed surfaces arecadmium plated for corrosion protection. Thesebearings can be re-lubricated thru the inner ringbore. When mounting, care should be taken toproperly support the end plates to eliminate thepossibility of bearing separation due to thrust loads.These bearings are dimensionally interchangeablewith the corresponding YAD and YAS Series. > has been a leader inthe design and manufacture ofspecialized bearings for the uniquerequirements of jet engines. We havekept pace with the ever increasingdemands for anti-friction bearings to operate at higher temperatures. Thrustreversers, afterburners, and divergentnozzles are some of the areas in which YAD (MS24465)& YAS (MS24466) Smith Bearing YAD and YAS Series Yoke Type bearings aredimensionally similar to the YAF and YAT Series. These bearings were designed for track rollerapplications where the outer race of the bearingis unsupported. They will handle heavy rolling or oscillating motion. The outer race is hard-chromeplated and all other exposed surfaces arecadmium plated for corrosion protection. Thebearing is held together using a swedged ringinserted around the inside of the end washers.These bearings are generally considered for replacement in existing applications. For new applications and current designs use the YAF and YAT Series. > ή Bearings are currentlyfunctioning. Contact our engineeringdepartment for recommendations anddesign assistance. YAG (MS24461) > Mil-B-3990 YAG Series Yoke Type bearings were designed forapplications where the bearing is mounted insidethe housing. These bearings handle slow rotating oroscillating motions. All external surfaces except thebore are cadmium plated for corrosion protection.The bearing is held together using a swedged ringinserted around the inside of the end washer. The products listed meet the military requirements of ( SAE AS 39901 ) Smith Aircraft Bearings are marked with the bearing designation includingbearing type code. Many of thesebearings are supplied pre-lubricated to meet the OEM's special requirements.When ordering, attention must be paidto the original manufacturers parts listrequirements so that properidentification can be provided. HRS (MS21432) & CHRS (MS21447) HRS and CHRS Series Stud Type bearings are of non-separable construction and are used inapplications involving high-static loads or oscillatingmotion. The HRS-Series - straight cylindrical outer > Smith manufactures bearings to meetthe provisions of the Federal AviationRegulations ( FAR ) for PartsManufacturing Approval ( PMA ). Smith Bearing > maintains an activelist identifying all of our FAA PMA partsand where they are applicable. This listis available upon request. race and the CHRS-Series - cr owned outer race were designed for airframe usage in flap tracks,canopies, and landing gear. When misalignment isa concern, the CHRS (crowned) Series is preferred.The outer races are hard-chrome plated and all other exposed surfaces are cadmium plated forcorrosion protection. >

Aircraft Static Capacity ( ASC )is the maximum load which can be placedon a housing mounted needle roller bearingwithout seriously brinelling the raceways(approx. 0.0001 inch deep) or deforming the rolling elements. Unsealed aircraft bearings can be operated at temperatures up to 400 ˚F provided that suitable lubrication is present. Highertemperature exposure will result in loss ofcapacity. The operating temperature for sealed bearings is limited to 250 ˚F due to the seal material. Limit Load Rating is the maximum static load that can be appliedwithout impairing the subsequent function...