1、 AEROSPACE STANDARD BEARING, BALL, AIRFRAME, ANTI-FRICTION, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) AS27644/1 Copyright 2017 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by
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3、e.org ISSUED2011-03REVISED2017-09THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.A FEDERAL SUPPLY CLASS 3110 AS27644 /1 SHEET 1 OF 3 REV. A PROCUREMENT SPECIFICATION: AS7949 SAE Technical Standards Board Rules provide that: “This report is published by SAEtoadvance thestate of technicaland engineering sc
4、iences. The useof this report is entirely voluntary, and its applicability andsuitability for any particularuse, includingany patent infringement arisingtherefrom,is the sole responsibility of theuser.” SAE reviews eachtechnical reportatleast every fiveyears at which time it may be revised, reaffirm
5、ed, 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/AS27644/1A RATIONALE THIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RINGS AND THE HE
6、AT 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. PASSIVATION IN ACCORDA
7、NCE 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 AS27644 /1 SHEET 2
8、OF 3 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, 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 -.005 1/ H WIDTH OUTER RING
9、 +.000 -.005 1/ (A) SHOULDER DIAMETER INNER RING (REF) E 4/ C 3/ MAXIMUM AXIAL INTERNAL CLEARANCE RADIAL LIMIT LOAD RATING LB THRUST LIMIT LOAD RATING LB 5/ 6/ RADIAL LOAD RATING (LB) FOR AVERAGE LIFE OF 10 000 COMPLETE 90 CYCLES WEIGHT POUNDS (APPROX) 9/ MAXIMUM STARTING TORQUE (IN-OZ) CORNER CHAMF
10、ER X 45 INNER RING BORE +.015 -.000 OUTER RING OD +.015 -.000 CASE I CASE II -3 .1900 .7774 .495 .473 .302 .005 .018 .005 7/ 2950 1700 2950 2830 .04 1.0 -4 .2500 .9014 .620 .491 .410 .005 .032 .006 7/ 5370 1800 3550 3020 .06 1.0 -5 .3125 1.2500 .745 .687 .469 .015 .032 .006 8/ 11000 4000 7360 6250 .
11、17 1.5 -6 .3750 1.4375 .870 .794 .551 .015 .032 .006 8/ 15760 5300 9690 8120 .26 2.0 -8 .5000 1.6875 .932 .856 .735 .015 .032 .007 23600 7800 14100 11600 .38 3.0 -10 .6250 1.9375 .995 .920 .890 .015 .044 .007 28400 9400 15300 13100 .53 4.5 1/ ALL DIMENSIONS TO BE MET AFTER SURFACE TREATMENT. 2/ OUT-
12、OF-ROUND TOLERANCES: BORE: +.0002, -.0007; OUTER DIAMETER: +.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 O
13、UTER RING. CASE II - LOAD FIXED WITH RESPECT TO INNER RING. 6/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. 7/ BOLTS OF 160000 PSI TENSILE STRENGTH ARE REQUIRED TO DEVELOP THE RADIAL LIMITLOAD SHOWN. 8/ BOLTS OF 180000 PSI TENSILE STRENGTH ARE REQUIRED TO DEVELOP THE RADIAL LIMITLOAD SHOWN. 9/ SPECI
14、FIED 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. REQUIREMENTS 1. MATERIAL RINGS: CORROSION RESISTANT NITROGEN STEEL (CREN) PER AMS5898, AMS5925, O
15、R 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 METHOD 2 (CITRIC ACID)
16、 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. 2. HARDNESS RINGS: STEEL PER AMS5898 AND AMS5925: THROUGH HARDEN TO 58 HRC MINIMUM. STEEL PER AMS5655: RING WALL
17、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 OF .030. BALLS: 58 HRC MINIMUM. 3. STABILITY RINGS AND BALLS SHALL BE STABILIZED FOR OPERATION UP TO 250 F. 4. LUBR
18、ICANT MIL-PRF-81322 OR MIL-PRF-23827 TYPE I. ALL 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 AS27644/1 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR O
19、PERATION WHERE TEMPERATURES EXCEED 250 F. AEROSPACE STANDARD AS27644 /1 SHEET 3 OF 3 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, DOUBLE ROW, HEAVY DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) 5. SURFACE ROUGHNESS RACEWAYS AND BALLS SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 MICROINCHES Ra PER
20、 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 EXTERNAL SURFACES EXCEPT BORE AND SEALS SHALL BE PLATED WITH ZINC NICKEL PER AMS2417, TYPE 2, GRADE B
21、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. AMS2700, METHOD 1, TYPE 8 SHALL NOT BE USED. 7. RADIAL INTERNAL CLEARANCE NO SUFFIX CODE: .0004 TO .
22、0010 8. ECCENTRICITIES RADIAL LATERAL INNER RING: .0010 MAXIMUM INNER RING: .0010 MAXIMUM OUTER RING: .0016 MAXIMUM OUTER RING: .0016 MAXIMUM 9. PART NUMBER THE PART NUMBER SHALL BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE. AS 27644/1 - 4 G P T = BEARING, BA
23、LL, AIRFRAME, ANTIFRICTION, 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 REQUIREMENT 6) LUBRICAN
24、T CODE (SEE REQUIREMENT 4) “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 QUESTIONS CONCERNING CADMIUMS USE. 1. ALL DIMENSIONS ARE IN INCHES,
25、 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 OF INVITATION FOR BIDS. 4. REVISION INDICATOR: A CHANGE BAR (I) L
26、OCATED 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.
