1、 AEROSPACE STANDARD BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTRA LIGHT DUTY, CORROSION RESISTANT NITROGEN STEEL (CREN) AS27646/1Copyright 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 any mea
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3、SSUED2011-03REVISED2017-09THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.A FEDERAL SUPPLY CLASS 3110 AS27646/1 SHEET 1 OF 3 REV. A PROCUREMENT SPECIFICATION: AS7949 SAE Technical Standards Board Rules provide that: “This reportis published by SAEtoadvance thestate of technicaland engineering sciences. T
4、he 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 whichtime it may be revised, reaffirmed, stabil
5、ized, 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/AS27646/1A RATIONALE THIS DOCUMENT REVISION ADDS THE FULLY SUBSTANTIATED AMS5655 MATERIAL FOR THE RINGS AND THE HEAT TREAT R
6、EQUIREMENT. 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 (NITRIC ACID). CRES BALLS WILL BE INDICATED BY “T” SUFFIX. NOTICE THE
7、COMPLETE 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 AS27646/1 SHEET 2 OF 3 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTRA LIGHT DUTY, CORROSION RESISTANT NITROGEN STE
8、EL (CREN) TABLE 1 - DIMENSIONS, LOAD RATINGS, WEIGHT, AND TORQUE DIAMETER WIDTH SHOULDER DIAMETER CORNER CHAMFER X 45 STATIC LIMIT LOAD RATING DYNAMIC RADIAL LOAD RATING APPROX. WEIGHT MAXIMUM STARTING TORQUE INNER OUTER INNER OUTER INNER OUTER RING RING RING RING 2/ 1/ 2/ 1/ 1/ 4/ 3/ AS B D W H INN
9、ER E C CASE I CASE II DASH NOMINAL NOMINAL +.000 +.000 RING +.015 +.015 RADIAL THRUST 5/ 6/ 7/ NO. DIM. TOL. DIM. TOL. -.005 -.005 (A) -.000 -.000 (LB) (LB) (LB) (LB) (LB) (IN-OZ) -38 .6250 1.0625 .2810 .250 .777 .015 .015 3280 1500 1990 1820 .03 2.0 -39 .7500 1.1875 .2810 .250 .895 .015 .015 3750 1
10、700 2050 1900 .04 2.0 -40 .8750 +.0007 1.3125 +.0000 .2810 .250 1.016 .015 .015 4220 1900 2110 1970 .05 3.0 -41 1.0625 -.0007 1.5000 -.0010 .2810 .250 1.216 .015 .015 5000 2200 2170 2020 .06 4.0 -42 1.3125 1.7500 .2810 .250 1.451 .015 .015 5950 2700 2220 2130 .09 4.0 -43 1.5625 2.0000 .2810 .250 1.7
11、02 .015 .015 6880 3200 2260 2180 .10 5.0 -44 1.8125 +.0010 2.2500 +.0000 .2810 .250 1.970 .015 .015 7980 3600 2300 2220 .11 6.0 -45 2.0625 -.0010 2.6250 -.0015 .2810 .250 2.286 .015 .015 9220 4000 2340 2260 .15 7.0 -46 2.3125 2.8750 .2810 .250 2.527 .015 .015 10150 4400 2360 2280 .17 8.0 1/ ALL DIME
12、NSIONS TO BE MET AFTER SURFACE TREATMENT. 2/ OUT-OF-ROUND TOLERANCES: BORE: -38 THROUGH -43: .0010, -44 THROUGH -46: .0016; OUTER DIA: -38 THROUGH -43: +.0005, -.0015; -44 THROUGH -46: +.0008, -.0023 3/ A RADIUS GIVING APPROXIMATELY THE SAME GRIP FOR STAKING THE BEARING IN THE HOUSING WILL BE ACCEPT
13、ABLE. 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 RING. 6/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. 7/ SPECIFIED LIMITS ARE FOR BEARINGS LUBRICATED WITH MIL-PRF-81322
14、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 OR AISI 422 STEEL PER AMS5655. BALLS: NO SUFFIX CODE: CORROSI
15、ON 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), OR ASTM A967/A967M, CITRIC I, II, OR III. AMS2700, METHOD
16、1, TYPE 8 SHALL NOT BE USED. SEALS: POLYTETRAFLUOROETHYLENE (PTFE) PER AMS3652 OR POLYTETRAFLUOROETHYLENE (PTFE) GLASS CLOTH REINFORCED PER AMS3666 TYPE 1 OR TYPE 2. TESTING FOR VOLUME RESISTIVITY AND ELECTRICAL FLAWS IS NOT REQUIRED. NOMINAL THICKNESS .020 WARP BREAKING STRENGTH SHALL BE 300 LB/IN
17、WIDTH MINIMUM. 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 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
18、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 BEARINGS SHALL BE PACKED WITH AN 80% MINIMUM GREASE FILL CONFORMING TO MIL-PRF-81322 UNLESS OTHERWISE SPECIFIED. IF MIL-PRF
19、-23827 TYPE I IS REQUIRED, ADD THE DESIGNATOR “G“ AFTER THE AS27646/1 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F. AEROSPACE STANDARD AS27646/1 SHEET 3 OF 3 REV. A BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTRA LIGHT DUTY, CORROSION RESISTANT NITR
20、OGEN STEEL (CREN) 5. SURFACE ROUGHNESS RACEWAYS AND BALLS SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 ICROINCHES 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. S
21、UFFIX 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 AND BALL SURFACES SHALL BE PASSIVATED IN ACCORDANCE WITH AMS2700, METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A 967, C
22、ITRIC I, II, OR III. AMS2700, METHOD 1, TYPE 8 SHALL NOT BE USED. 7. RADIAL INTERNAL CLEARANCE NO SUFFIX CODE: .0008 TO .0018 8. ECCENTRICITIES RADIAL LATERAL INNER RING: .0020 MAXIMUM INNER RING: .0020 MAXIMUM OUTER RING: .0016 MAXIMUM OUTER RING: .0016 MAXIMUM 9. PART NUMBER THE PART NUMBER SHALL
23、BE SEQUENCED LEFT TO RIGHT WITHOUT SPACES WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE. AS 27646/1 - 38 G P T = BEARING, BALL, AIRFRAME, ANTIFRICTION, HEAVY DUTY, CREN, .6250 INCH BORE, .0008 TO .0018 RADIAL INTERNAL CLEARANCE, FILLED 80% MINIMUM WITH MIL-PRF-23827 TYPE I LUBRICANT, 250 F MAXIMUM TEM
24、PERATURE, PASSIVATED, WITH CRES BALLS. BALL MATERIAL CODE (SEE REQUIREMENT 1) SURFACE TREATMENT CODE (SEE REQUIREMENT 6) LUBRICANT 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 CADMI
25、UM 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 DOCUMENT AND REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD TAKES PRECEDENCE. 3. RE
26、FERENCED 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 DOCUMENTS THAT CONTAIN EDITORIAL CHANGES ONLY.
