1、AEROSPACE STANDARDBEARING, BALL, AIRFRAMEANTI-FRICTION, EXTRA LIGHT DUTYCORROSION RESISTANT NITROGEN STEEL (CREN)AS27642/1Copyright 2017 SAE InternationalAll rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, elec
2、tronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA)Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgISSUED2017-0
3、2THIRD ANGLE PROJECTIONCUSTODIAN: ACBGFEDERAL SUPPLY CLASS3110AS27642/1SHEET 1 OF 5PROCUREMENT SPECIFICATION: AS7949SAE Technical Standards BoardRules providethat:“This reportis publishedby SAE to advance thestateoftechnical andengineering sciences. The useofthis reportis entirely voluntary, and its
4、 applicability and suitability forany particularuse, includingany patent infringement arising therefrom, is thesole responsibility of theuser.”SAE reviews eachtechnical reportatleastevery five years at whichtime it may berevised, reaffirmed, stabilized, or cancelled. SAEinvites your written comments
5、 and suggestions.SAE values your input. To provide feedback on thisTechnical Report, please visit http:/standards.sae.org/AS27642/1RATIONALETHIS STANDARD DEFINES A CORROSION RESISTANT NITROGEN STEEL (CREN) VERSION OF THE AS27642 EXTRA LIGHT DUTY AIRFRAME BALL BEARING SERIES.NOTICETHE COMPLETE REQUIR
6、EMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THIS DOCUMENT AND THE LATEST ISSUE OF AS7949.FIGURE 1 - PART CONFIGURATIONAEROSPACE STANDARD AS27642/1SHEET 2 OF 5BEARING, BALL, AIRFRAMEANTI-FRICTION, EXTRA LIGHT DUTYCORROSION RESISTANT NITROGEN STEEL (CREN)TABLE 1 - DIMENSIONSASDA
7、SHNO.BBORE2/BORE TOLERANCE DOUTSIDEDIAMETER+.0000-.00101/ 2/WWIDTHINNERRING+.000-.0051/HWIDTHOUTERRING+.000-.0051/(A)SHOULDERDIAMETERINNERRING(APPROX)E4/C3/WEIGHTPOUNDS(APPROX)CORNER CHAMFER X 45WITHOUT SUFFIXSWITH SUFFIXSINNERRING BORE+.015-.000OUTERRING OD+.015-.000-16 1.0000 +.0000-.0005+.0000-.0
8、0051.7500.437 .3751.141.024 .024.14-21 1.3125+.0005-.00052.0625 1.454 .16-23 1.4375 2.1875 1.575 .17-25 1.5625 2.3125 1.693 .19-29 1.8125 2.5625 1.931 .21-33 2.0625 2.8125 2.231 .23-37 2.3125 3.0625 2.468 .26-47 2.9375 3.8750.531 .4693.093.039 .039.49-49 3.0625 4.0000 3.222 .53-52 3.2500+.0000-.0010
9、+.0000-.00104.1875 3.479 .65-56 3.5000 4.4375 3.775 .70-60 3.7500 4.6875 4.014 .74-64 4.0000 4.9375 4.253 .78-68 4.2500 5.3125.593 .5314.517 .87-72 4.5000 5.5625 4.774 .92-76 4.7500 5.8125 5.046 1.00-80 5.0000 6.0625 5.246 1.04-84 5.2500 6.3125 5.506 1.09-88 5.5000 6.5625 5.770 1.14-92 5.7500 6.8125
10、 6.033 1.18-96 6.0000 7.0625 6.303 1.231/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT.2/ OUT-OF-ROUND TOLERANCES: BORE WITHOUT SUFFIX “S”: -16 +.0002, -.0007; -21 THROUGH -49 +.0008, -.0008; -52 THROUGH -96 +.0005, -.0015.BORE WITH SUFFIX ”S” -16 THROUGH -49 +.0003, -.0008;-52 THROUGH -96 +.000
11、3, -.0013.OUTER DIA: +.0010, -.0020.3/ A RADIUS GIVING APPROXIMATELY THE SAME GRIP FOR STAKING THE BEARING IN THE HOUSING WILL BE ACCEPTABLE.4/ A RADIUS GIVING APPROXIMATELY THE SAME FILLET CLEARANCE WILL BE ACCEPTABLE.AEROSPACE STANDARD AS27642/1SHEET 3 OF 5BEARING, BALL, AIRFRAMEANTI-FRICTION, EXT
12、RA LIGHT DUTYCORROSION RESISTANT NITROGEN STEEL (CREN)TABLE 2 - TOLERANCES AND LOADSASDASHNO.RADIAL INTERNAL CLEARANCE ECCENTRICITIESRADIALLIMITLOADRATING(LB)THRUSTLIMITLOADRATING(LB)5/ 6/RADIAL LOAD RATING(LB) FOR AVERAGELIFE OF 10000COMPLETE 90 CYCLES7/MAXIMUM STARTING TORQUE(IN-OZ)WITHOUT SUFFIXS
13、WITH SUFFIXS RADIAL LATERAL CASE I CASE II-16.0003TO.0010.0001TO.0005.0010 .0016 .0010 .00168090 3600 4260 3960 5.0-21 9840 4400 4590 4290 7.0-23 10500 4700 4650 4360 9.0-25 11300 5000 4680 4420 9.0-29 12700 5600 4760 4530 14.0-33 14400 6400 4820 4630 14.0-37 15800 7000 4880 4690 20.0-47 24700 10900
14、 6600 6390 30.0-49 27500 12100 8150 7840 32.0-52.0003TO.0015.0012 .0016 .0010 .001628700 12600 8210 78808/-56 31200 13700 8240 7970-60 33100 14600 8290 8010-64 35000 15400 8350 8100-68 41900 18400 10280 9900-72 44300 19500 10330 10000-76.0014 .0018 .0012 .001846700 20500 10350 10050-80 48200 21200 1
15、0360 10090-84 50600 22300 10420 10120-88 53000 23300 10480 10200-92 55400 24400 10550 10240-96 .0020 .0016 .0020 57700 25400 10520 102105/ 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 T
16、O 350 F, THE RATINGSSHALL BE REDUCED BY 20%.7/ 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 TABLE MULTIPLIED BY 1.2.8/ TORQUE VALUES FOR THESE SIZE BEARINGS SHALL
17、 BE SPECIFIED IN PURCHASE ORDERS.REQUIREMENTS1. MATERIAL:RINGS: CORROSION RESISTANT NITROGEN STEEL (CREN) 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 AMS
18、5880 OR AMS5618.CRES BALLS SHALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A967/A967M, CITRIC I, II, OR III.AMS2700 METHOD 1, TYPE 8 SHALL NOT BE USED.SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652.SEAL RETAINERS: ANY CORROSION RESISTANT S
19、TEEL.2. HARDNESS:RINGS: STEEL PER AMS5898 AND AMS5925 THROUGH HARDEN TO 58 HRC MINIMUM.STEEL PER AMS5655: RING WALL THICKNESS .090 OR LESS: CASE HARDEN 58 HRC MINIMUM AT A CASE DEPTH OF 1/3 WALL THICKNESS.RING WALL THICKNESS GREATER THAN .090: CASE HARDEN 58 HRC MINIMUM AT A CASE DEPTHOF .030.BALLS:
20、 58 HRC MINIMUM.AEROSPACE STANDARD AS27642/1SHEET 4 OF 5BEARING, BALL, AIRFRAMEANTI-FRICTION, EXTRA LIGHT DUTYCORROSION RESISTANT NITROGEN STEEL (CREN)3. STABILITY:RINGS AND BALLS SHALL BE STABILIZED FOR OPERATION UP TO 250 F.4. LUBRICANT: ALL BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILL
21、.NO SUFFIX CODE MIL-PRF-81322 GREASE.SUFFIX CODE “G” MIL-PRF-23827 TYPE I GREASE.MIL-PRF-23827 TYPE I GREASE SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F.5. SURFACE ROUGHNESS:RACEWAYS AND BALLS SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 MICROINCHES Ra PER ANSI/ASME B46.1.6. SURFA
22、CE TREATMENT:NO SUFFIX CODE ALL EXTERNAL SURFACES EXCEPT BORE, SEALS AND SEAL RETAINERS 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, SEALS AND SEAL RETAINERS SHALL BE PLATED WITH ZINCNICKEL PER AMS2417, TYPE 2
23、, GRADE B, .0003 TO .0006 THICK.SUFFIX CODE “P” ALL RING SURFACES SHALL BE PASSIVATED PER AMS2700 METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A967, CITRIC I, II, OR III.AMS2700 METHOD 1, TYPE 8 SHALL NOT BE USED.7. RADIAL INTERNAL CLEARANCE:SEE TABLE 2.8. RADIAL AND LATERAL ECCENTRICIT
24、Y:SEE TABLE 2.9. PART NUMBER:THE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE:EXAMPLE OF PART NUMBER:AS27642/1 -16 S G E T = BEARING, BALL, AIRFRAME, ANTIFRICTION, EXTRA LIGHT DUTY, CREN1.0000 INCH +.0000, -.0005 BORE, .0001 TO .0005 INCH RA
25、DIAL INTERNALCLEARANCE, FILLED 80% MINIMUM WITH MIL-PRF-23827 TYPE I LUBRICANT, )0$;: ITH ZINC-NICKEL PLATING AND CRES BALLS PER AMS5880 OR AMS5618BALL MATERIAL CODE (SEE REQUIREMENT 1)SURFACE TREATMENT CODE (SEE REQUIREMENT 6)LUBRICANT (SEE REQUIREMENT 4)REDUCED TOLERANCE DESIGNATOR (SEE TABLE 1 FO
26、R BORE TOLERANCE ANDTABLE 2 FOR RADIAL CLEARANCE)“AS” DASH NUMBER (SEE TABLE 1)AEROSPACE STANDARD NUMBERAEROSPACE STANDARD AS27642/1SHEET 5 OF 5BEARING, BALL, AIRFRAMEANTI-FRICTION, EXTRA LIGHT DUTYCORROSION RESISTANT NITROGEN STEEL (CREN)NOTESNOTICETHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CAD
27、MIUM AS A PLATING MATERIAL. 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
28、. REFERENCED DOCUMENTS 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 DOCUMENTSTHAT CONTAIN EDITORIAL CHANGES ONLY.
