1、AEROSPACE STANDARDBEARING, BALL, AIRFRAME,ANTI-FRICTION, INTERMEDIATE DUTY, CORROSIONRESISTANT NITROGEN STEEL (CREN)AS27641/1Copyright 2016 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, e
2、lectronic, 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.orgISSUED201
3、1-03REVISED2016-07THIRD ANGLE PROJECTIONCUSTODIAN: ACBGREV. AFEDERAL SUPPLY CLASS3110AS27641/1SHEET 1 OF 3REV.APROCUREMENT SPECIFICATION: AS7949SAE Technical Standards BoardRules providethat:“This reportis publishedby SAE to advance thestateoftechnical andengineering sciences. The useofthis reportis
4、 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, or cancelled. SAEinv
5、ites your written comments and suggestions.SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS27641/1ARATIONALETHIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RINGS AND THE HEAT TREAT REQUIREMENT. AMS3
6、666 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 WITH AMS2700, METHOD 1
7、 (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 STANDARDAS27641/1SHEET 2 OF 3REV.ABEARING, BALL, AIRFRAME,ANTI-FR
8、ICTION, INTERMEDIATE DUTY, CORROSIONRESISTANT 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)SHOULDERDIAMETERINNERRING(REF)E4/C3/RADIALLIMITLOADRATINGLBTH
9、RUSTLIMITLOADRATINGLB5/ 6/RADIAL LOAD RATING(LB) FOR AVERAGELIFE OF 10 000COMPLETE 90 CYCLES WEIGHTPOUNDS(APPROX)7/MAXIMUMSTARTINGTORQUE(IN-OZ)CORNER CHAMFER X 45INNERRING BORE+.015-.000OUTERRING OD+.015-.000 CASE I CASE II-3 .1900 .6250 .297 .234 .297 .005 .016 1560 700 1500 1250 .01 1.0-4 .2500 .7
10、500 .281 .219 .380 .005 .016 1880 900 1690 1450 .02 1.5-5 .3125 .8125 .297 .234 .415 .015 .016 2190 1000 1820 1600 .02 1.5-6 .3750 .8750 .313 .250 .495 .015 .016 2500 1100 1920 1710 .03 2.0-8 .5000 1.1250 .0375 .313 .616 .015 .016 3910 1700 2870 2550 .05 2.5-10 .6250 1.3750 .406 .344 .768 .015 .032
11、6700 3000 4980 4360 .08 3.0-12 .7500 1.6250 .437 .375 .919 .015 .032 8790 3900 5980 5320 .13 3.0-16 1.0000 2.0000 .500 .438 1.241 .015 .032 11900 5200 7070 6400 .22 4.0-20 1.2500 2.2500 .500 .438 1.478 .015 .032 13800 6100 7400 6810 .26 5.01/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT.2/ OUT-O
12、F-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 SAME FILLET CLEARANCE WILL BE ACCEPTABLE.5/ CASE I - LOAD FIXED WITH RESPECT TO OUTER RING
13、. 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/ SPECIFIED LIMITS ARE FOR BEARINGS LUBRICATED WITH MIL-PRF-81322 GREASE. FOR BEARINGS LUBRICATED WITH MIL-PRF-23827.TYPE I GREASE, THE TO
14、RQUE LIMIT SHALL BE THE SPECIFIED VALUE IN THE TABLE MULTIPLIED BY 1.2.REQUIREMENTS:1. MATERIALRINGS: 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“:
15、 CORROSION RESISTANT STEEL (CRES) PER AMS5880 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. SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652.SEAL RETAINERS: ANY CORROSION RESISTANT S
16、TEEL.2. HARDNESSRINGS: STEEL PER AMS5898 AND AMS5925: THROUGH HARDEN TO 58 HRC MINIMUM.STEEL PER AMS5655: RING WALL THICKNESS .090 OR LESS: CASE 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
17、 OF .030BALLS: 58 HRC MINIMUM.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-23827 TYPE I IS RE
18、QUIRED, ADD THE DESIGNATOR “G“ AFTER THEAS27641/1 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 SURFA&(528*+1(662), N RA PER ASME B46.1AEROSPACE STANDARDAS27641/1SHEET 3 OF 3REV.ABEARING,
19、BALL, AIRFRAME,ANTI-FRICTION, INTERMEDIATE DUTY, CORROSIONRESISTANT NITROGEN STEEL (CREN)6. SURFACE TREATMENTNO SUFFIX CODE: 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
20、BORE AND SEALS SHALL BE PLATED WITH ZINC NICKEL PER AMS2417, TYPE 2, GRADE B .0003 TO .0006 THICK.SUFFIX CODE “P”: ALL RING 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 CLEAR
21、ANCENO SUFFIX CODE: .0004 TO .0010SUFFIX CODE “R“: .0002 TO .00058. ECCENTRICITIESRADIAL LATERALINNER RING: .0010 MAXIMUM INNER 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
22、 FOLLOWING SEQUENCE.AS 27641/1 - 4 R G P T = BEARING, BALL, AIRFRAME, ANTIFRICTION, INTERMEDIATE DUTY, CREN, .2500 BORE, .0002 TO .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 TREATM
23、ENT CODE (SEE REQUIREMENT 6)LUBRICANT CODE (SEE REQUIREMENT 4)RADIAL INTERNAL CLEARANCE CODE (SEE REQUIREMENT 7)“AS” DASH NUMBER (SEE TABLE 1)AEROSPACE SERIESAEROSPACE STANDARD (AS) PREFIXNOTES:WARNINGTHIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIA
24、LS 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 DOCUMENTS SHALL BE OF THE ISSUE IN E
25、FFECT 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.
