1、AEROSPACE STANDARDBEARING, BALL, AIRFRAME, ANTI-FRICTION,SELF-ALIGNING, LIGHT AND HEAVY DUTY,CORROSION RESISTANT NITROGEN STEEL (CREN)AS27645/1Copyright 2016 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form
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3、w.sae.orgISSUED2011-03REVISED2016-08THIRD ANGLE PROJECTIONCUSTODIAN: ACBGREV. AFEDERAL SUPPLY CLASS3110AS27645/1SHEET 1 OF 4REV.APROCUREMENT SPECIFICATION: AS7949SAE Technical Standards BoardRules providethat:“This reportis publishedby SAE to advance thestateoftechnical andengineering sciences. The
4、useofthis reportis entirely voluntary, and its applicability and suitability forany particularuse, includingany patent infringement arising therefrom, is thesole responsibility of theuser.”SAE reviews eachtechnical reportatleastevery fiveyears at whichtime it may berevised, reaffirmed, stabilized, o
5、r cancelled. SAEinvites your written comments and suggestions.SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS27645/1ARATIONALETHIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RINGS AND THE HEAT TREA
6、T REQUIREMENT. AMS3666 IS BEING REMOVED AS A SEAL MATERIAL AS NO SUPPLIER UTILIZES IT ON THIS SERIES. THE LUBRICATION IS BEING REVISED FROM A TRADE NAME TO AN INDUSTRY AVAILABLE SPECIFICATION MIL-PRF-23827 TYPE 1. ZINC NICKEL PER AMS2417 WILL BE INDICATED BY “E” SUFFIX. PASSIVATION IN ACCORDANCE WIT
7、H AMS2700, METHOD 1 (NITRIC ACID). CRES BALLS WILL BE INDICATED BY “T” SUFFIX.NOTICETHE COMPLETE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THISDOCUMENT AND THE LATEST ISSUE OF AS7949.FIGURE 1 - CREN AIRFRAME BEARINGAEROSPACE STANDARD AS27645/1SHEET 2 OF 4REV.ABEARING,
8、BALL, AIRFRAME, ANTI-FRICTION,SELF-ALIGNING, LIGHT AND HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN)TABLE 1 - DIMENSIONS, LOAD RATINGS, WEIGHT, AND TORQUEASDASHNO.BBORE+.0000-.00052/DOUTSIDEDIAMETER+.0000-.00051/ 2/WWIDTHINNERRING+.000-.0051/HWIDTHOUTERRING+.000-.0051/(A)SHOULDERDIAMETERINNE
9、RRING(REF)E4/C3/RADIALLIMITLOADRATINGLBTHRUSTLIMITLOADRATINGLB5/ 6/RADIAL LOAD RATING(LB) FOR AVERAGELIFE OF 10000COMPLETE 90 CYCLESMAXIMUMAXIALINTERNALCLEARANCEWEIGHTPOUNDS(APPROX)CORNER CHAMFER X 45INNERRING BORE+.015-.000OUTERRING OD+.015-.000 CASE I CASE II-3A .1900 .6250 .245 .203 .253 .005 .01
10、6 550 100 550 480 .023 .01-4A .2500 .7500 .281 .219 .321 .005 .016 900 200 900 770 .025 .01-5A .3125 .8125 .297 .234 .381 .015 .016 1000 200 950 815 .028 .02-6A .3750 .8750 .313 .250 .453 .016 .016 1120 200 1120 990 .030 .02-3 .1900 .7774 .297 .270 .290 .005 .022 900 200 900 770 .023 .03-4 .2500 .90
11、14 .484 .335 .390 .005 .032 1410 300 1230 1230 .025 .04-5 .3125 1.2500 .558 .375 .561 .015 .032 2190 300 2190 1890 .028 .10-6 .3750 1.4375 .620 .469 .607 .015 .032 2980 400 2980 2580 .030 .15-8 .5000 1.6875 .620 .500 .791 .015 .044 3670 500 3670 3290 .032 .23-10 .6250 1.9375 .813 .625 .916 .015 .044
12、 5320 600 4980 4360 .034 .371/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT.2/ OUT-OF-ROUND TOLERANCES: BORE: +.0002, -.0007; OUTER DIA: +.0005, -.0010.3/ A RADIUS GIVING APPROXIMATELY THE SAME GRIP FOR STAKING THE BEARING IN THE HOUSING WILL BE ACCEPTABLE.4/ A RADIUS GIVING APPROXIMATELY THE SA
13、ME FILLET CLEARANCE WILL BE ACCEPTABLE.5/ CASE I - LOAD FIXED WITH RESPECT TO OUTER RING.CASE II - LOAD FIXED WITH RESPECT TO INNER RING.6/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. FOR OPERATION UP TO 350 F, THE RATINGS SHALL BE REDUCED BY 20%.7/ THESE BEARINGS ARE INTERNAL SELF-ALIGNING FOR 10
14、DEGREES IN EITHER DIRECTION EXCEPT AS-4A, -5A, AND -6A WHICH ARE SELF ALIGNING FOR 8 DEGREES IN EITHER DIRECTION.8/ SPECIFIED LIMITS ARE FOR BEARINGS LUBRICATED WITH MIL-PRF-81322 GREASE. FOR BEARINGS LUBRICATED WITH MIL-PRF-23827 TYPE I GREASE, THE TORQUE LIMIT SHALL BE THE SPECIFIED VALUE IN THE T
15、ABLE MULTIPLIED BY 1.2.TABLE 1 (CONTINUED)ASDASHNO.8/MAXIMUMSTARTINGTORQUE(IN-OZ)MINIMUM TORQUE TO DISLODGE SEALS(IN-LB)-3A 1.0 4.0-4A 1.0 6.0-5A 2.0 10.0-6A 3.0 8.0-3 1.0 6.0-4 1.0 5.0-5 2.0 16.0-6 3.0 18.0-8 4.0 20.0-10 6.0 25.0REQUIREMENTS1. MATERIALRINGS: CORROSION RESISTANT NITROGEN STEEL (CREN
16、) PER AMS5898, AMS5925, OR AISI 422 STEEL PER AMS5655.BALLS: NO SUFFIX CODE: CORROSION RESISTANT NITROGEN STEEL (CREN) PER AMS5898 OR AMS5925.SUFFIX CODE “T“: CORROSION RESISTANT STEEL (CRES) PER AMS5880 OR AMS5618. CRES BALLS SHALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR
17、 METHOD 2 (CITRIC ACID), OR ASTM A967/A967M, CITRIC I, II, OR III. SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652.SEAL RETAINERS: ANY CORROSION RESISTANT STEEL.2. HARDNESSRINGS: STEEL PER AMS5898 AND AMS5925: THROUGH HARDEN TO 58 HRC MINIMUM.STEEL PER AMS5655: RING WALL THICKNESS .090 OR LESS: CA
18、SE HARDEN TO 58 HRC MINIMUM AT A CASE DEPTH OF 1/3 OF THE WALL THICKNESS.RING WALL THICKNESS GREATER THAN .090: CASE HARDEN TO 58 HRC MINIMUM AT A CASE DEPTH OF .030BALLS: 58 HRC MINIMUM.AEROSPACE STANDARD AS27645/1SHEET 3 OF 4REV.ABEARING, BALL, AIRFRAME, ANTI-FRICTION,SELF-ALIGNING, LIGHT AND HEAV
19、Y DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN)3. STABILITYRINGS AND BALLS SHALL BE STABILIZED FOR OPERATION UP TO 350 F.4. LUBRICANTMIL-PRF-81322 OR MIL-PRF-23827 TYPE I. ALL BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILL CONFORMINGTO MIL-PRF-81322 UNLESS OTHERWISE SPECIFIED. IF MIL-PRF
20、-23827 TYPE I IS REQUIRED, ADD THE DESIGNATOR “G“ AFTER THEAS27645/1 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F.5. SURFACE ROUGHNESSRACEWAYS AND BALLS SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF ,15 a PER ASME B46.16. SURFACE TREATMENTNO SUFFIX CO
21、DE ALL EXTERNAL SURFACES EXCEPT BORE AND SEALS SHALL BE PLATED WITH CADMIUM PER AMS-QQ-P-416, TYPE I, CLASS 2, .0003 TO .0006 THICK.SUFFIX CODE “E” ALL EXTERNAL SURFACES EXCEPT BORE AND SEALS SHALL BE PLATED WITH ZINC NICKEL PER AMS2417, TYPE 2, GRADE B .0003 TO .0006 THICK.SUFFIX CODE “P” ALL RING
22、AND BALL SURFACES SHALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A 967, CITRIC I, II, OR III.7. RADIAL INTERNAL CLEARANCENO SUFFIX CODE: .0004 TO .0010SUFFIX CODE “R“: .0002 TO .00058. ECCENTRICITIESRADIAL LATERALINNER RING: .0010 MAXIMUM IN
23、NER RING: .0010 MAXIMUMOUTER RING: .0016 MAXIMUM OUTER RING: .0016 MAXIMUM9. PART NUMBERTHE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE.AS 27645/1 - 4 R G P T = BEARING, BALL, AIRFRAME, ANTIFRICTION, HEAVY DUTY, CREN, .2500 BORE, .0002 TO .
24、0005 RADIAL INTERNAL CLEARANCE, FILLED 80% MIN. WITH MIL-PRF-23827 TYPE I (250 F MAX. TEMP.), PASSIVATED, CRES BALLS.BALL MATERIAL CODE (SEE REQUIREMENT 1)SURFACE TREATMENT CODE (SEE REQUIREMENT 6)LUBRICANT CODE (SEE REQUIREMENT 4)RADIAL INTERNAL CLEARANCE CODE (SEE REQUIREMENT 7)“AS” DASH NUMBER (S
25、EE TABLE 1)AEROSPACE SERIESAEROSPACE STANDARD (AS) PREFIXAEROSPACE STANDARD AS27645/1SHEET 4 OF 4REV.ABEARING, BALL, AIRFRAME, ANTI-FRICTION,SELF-ALIGNING, LIGHT AND HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN)NOTESNOTICETHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MA
26、TERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE QUESTIONS CONCERNING CADMIUMS USE.1. ALL DIMENSIONS ARE IN INCHES, UNLESS OTHERWISE SPECIFIED.2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS SPECIFICATION AND REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD TAKES PRECEDENCE.3. REFERENCED DOCUMEN
27、TS SHALL BE OF THE ISSUE IN EFFECT ON DATE OF INVITATION FOR BIDS.4. REVISION INDICATOR: A CHANGE BAR (I) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT EDITORIAL CHANGES, HAVE BEEN MADE TO THE PREVIOUS ISSUE OF THIS DOCUMENT. AN (R) SYMBOL TO THE LEFT OF THE DOCUMENT TITLE INDICATES A COMPLETE REVISION OF THE DOCUMENT, INCLUDING TECHNICAL REVISIONS. CHANGE BARS AND (R) ARE NOT USED IN ORIGINAL PUBLICATIONS, NOR IN DOCUMENTS THAT CONTAIN EDITORIAL CHANGES ONLY.
