1、 AEROSPACE STANDARD BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) AS27643/1 Copyright 2017 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in
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3、S: http:/www.sae.org ISSUED2011-03REVISED2017-08THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.A FEDERAL SUPPLY CLASS 3110 AS27643 /1 SHEET 1 OF 4 REV. A PROCUREMENT SPECIFICATION: AS7949 SAE Technical Standards Board Rules provide that: “This report is published by SAEtoadvance thestate of technicaland
4、 engineering sciences. The useof this report is entirely voluntary, and its applicability andsuitability for any particularuse, includingany patent infringement arisingtherefrom,is thesole responsibility of theuser.” SAE reviews eachtechnical reportatleast every fiveyears at whichtime it may be revi
5、sed, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS27643/1A RATIONALE THIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RIN
6、GS AND THE HEAT TREAT 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. PASSIVATI
7、ON IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OPTION ADDED. CRES BALLS WILL BE INDICATED BY “T” SUFFIX. NOTICE THE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CONSIST OF THIS DOCUMENT AND THE LATEST ISSUE OF AS7949. FIGURE 1 - CREN AIRFRAME BEARING AEROSPACE STANDARD AS2764
8、3 /1 SHEET 2 OF 4 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) TABLE 1 - DIMENSIONS, LOAD RATINGS, WEIGHT, AND TORQUE AS DASH NO. B BORE +.0000 -.0005 2/ D OUTSIDE DIAMETER +.0000 -.0005 1/ 2/ W WIDTH INNER RING +.000
9、 -.005 1/ H WIDTH OUTER RING +.000 -.005 1/ (A) SHOULDER DIAMETER INNER RING (REF) E 4/ C 3/ MAXIMUM INTERNAL AXIAL CLEARANCE RADIAL LIMIT LOAD RATING LB THRUST LIMIT LOAD RATING LB 5/ 6/ RADIAL LOAD RATING (LB) FOR AVERAGE LIFE OF 10000 COMPLETE 90 CYCLES WEIGHT POUNDS (APPROX) CORNER CHAMFER X 45
10、INNER RING BORE +.015 -.000 OUTER RING OD +.015 -.000 CASE I CASE II -3 .1900 .7774 .500 .392 .304 .005 .022 .0055 1420 200 1420 1220 .05 -4 .2500 .9014 .687 .464 .430 .005 .032 .0055 1780 300 1780 1600 .06 -5 .3125 1.2500 .812 .656 .515 .015 .032 .006 3740 600 3740 3300 .16 -6 .3750 1.4375 .937 .75
11、0 .564 .015 .032 .006 5100 800 4980 4370 .24 -8 .5000 1.6875 1.000 .812 .775 .015 .044 .007 7120 1000 6340 5570 .36 -10 .6250 1.9375 1.125 .937 .869 .015 .044 .007 9000 1300 7780 6860 .53 1/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT. 2/ OUT-OF-ROUND TOLERANCES: BORE: +.0002, -.0007; OUTER DIA
12、: +.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. CASE II - LOAD FIXED WITH RESPECT TO INNER RIN
13、G. 6/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. 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/ THESE BEARINGS ARE INTERNAL SELF-AL
14、IGNING FOR 10 MINIMUM IN EITHER DIRECTION. MISALIGNMENT ANGLE IS NOT TO EXCEED MINIMUM REQUIREMENT IN DESIGN OR APPLICATION. TABLE 1 (CONTINUED) AS DASH NO. 7/ MAXIMUM STARTING TORQUE (IN-OZ) MINIMUM TORQUE TO DISLODGE SEAL -3 1.0 8 -4 1.0 12 -5 3.0 28 -6 4.0 45 -8 5.0 60 -10 6.0 78 REQUIREMENTS 1.
15、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 AMS5880 OR AMS5618. CRES BALLS SHALL BE PASSIV
16、ATED 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 STEEL. AEROSPACE STANDARD AS27643 /1 SH
17、EET 3 OF 4 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) 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 TO 58 HRC MI
18、NIMUM 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 .030. BALLS: 58 HRC MINIMUM. 3. STABILITY RINGS AND BALLS SHALL BE STABILIZED FOR OPERATION UP TO 250 F. 4. LUBRICANT MIL-PRF-81322 OR MIL-PRF-23827 TYPE I. ALL
19、 BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILL CONFORMING TO MIL-PRF-81322 UNLESS OTHERWISE SPECIFIED. IF MIL-PRF-23827 TYPE I IS REQUIRED, ADD THE DESIGNATOR “G“ AFTER THE AS27643/1 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F. 5. SURF
20、ACE ROUGHNESS RACEWAYS AND BALLS SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 MICROINCHES Ra PER ASME B46.1. 6. SURFACE TREATMENT NO 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 EXTERN
21、AL 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 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. AMS2
22、700, METHOD 1, TYPE 8 SHALL NOT BE USED. 7. RADIAL INTERNAL CLEARANCE NO SUFFIX CODE: .0000 TO .0010 SUFFIX CODE “R“: .0002 TO .0005 8. ECCENTRICITIES RADIAL LATERAL INNER RING: .0010 MAXIMUM INNER RING: .0010 MAXIMUM OUTER RING: .0016 MAXIMUM OUTER RING: .0016 MAXIMUM AEROSPACE STANDARD AS27643 /1
23、SHEET 4 OF 4 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) 9. PART NUMBER THE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE. AS 27643/1 - 4 R G P T = BEARING, B
24、ALL, AIRFRAME, ANTIFRICTION, SELFALIGNING, DOUBLE ROW, HEAVY DUTY, CREN, .2500 BORE, .0002 TO .0005 RADIAL INTERNAL CLEARANCE, FILLED 80% MINIMUM WITH MIL-PRF-23827 TYPE I (250 F MAXIMUM TEMPERATURE), PASSIVATED, CRES BALLS. BALL MATERIAL CODE (SEE REQUIREMENT 1) SURFACE TREATMENT CODE (SEE REQUIREM
25、ENT 6) LUBRICANT CODE (SEE REQUIREMENT 4) RADIAL INTERNAL CLEARANCE CODE (SEE REQUIREMENT 7) “AS” DASH NUMBER (SEE TABLE 1) AEROSPACE SERIES AEROSPACE STANDARD (AS) PREFIX NOTES NOTICE THIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE Q
26、UESTIONS 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 EFFECT ON DATE
27、 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.
