1、AEROSPACE STANDARD BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTERNAL SELF ALIGNING, EXTRA LIGHT DUTY AS27648Copyright 2014 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 means, electronic, mechan
2、ical, 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.org ISSUED1998-04REVISED201
3、4-04THIRD ANGLE PROJECTION CUSTODIAN: AIRFRAME CONTROL BEARINGS GROUP REV.DFEDERAL SUPPLY CLASS 3110 AS27648SHEET 1 OF 5REV. DPROCUREMENT SPECIFICATION: AS7949SAE Technical Standards Board Rules provide that: “This report is publishedbySAEtoadvance thestateoftechnical and engineeringsciences. The us
4、eofthis reportisentirely voluntary, and its applicabilityand suitability for any particularuse, includingany patent infringement arising therefrom, isthe soleresponsibility of the user.”SAE reviews each technical report at least every five years at whichtime it mayberevised, reaffirmed, stabilized,
5、or cancelled. SAE invites your writtencomments and suggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS27648DRATIONALE CORRECT THE OUT-OF-ROUND TOLERANCES LISTED UNDER TABLE 1. NOTICE THE INITIAL SAE PUBLICATION OF THI
6、S DOCUMENT WAS TAKEN DIRECTLY FROM U.S. MILITARY STANDARD MS27648E. THIS SAE STANDARD MAY RETAIN THE SAME PART NUMBERS ESTABLISHED BY THE ORIGINAL MILITARY DOCUMENT. ANY REQUIREMENTS ASSOCIATED WITH QUALIFIED PRODUCTS LISTS (QPL) MAY CONTINUE TO BE MANDATORY FOR DOD CONTRACTS. REQUIREMENTS RELATING
7、TO QPLS HAVE NOT BEEN ADOPTED BY THE SAE FOR THIS STANDARD AND ARE NOT PART OF THIS SAE DOCUMENT. AEROSPACE STANDARD AS27648SHEET 2 OF 5REV. DBEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTERNAL SELF ALIGNING, EXTRA LIGHT DUTY THE COMPLETE REQUIREMENTS FOR PROCURING THE PRODUCT DESCRIBED HEREIN SHALL CO
8、NSIST OF THIS DOCUMENT AND THE LATEST ISSUE OF AS7949. FIGURE 1 - PART CONFIGURATION AEROSPACE STANDARD AS27648SHEET 3 OF 5REV. DBEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTERNAL SELF ALIGNING, EXTRA LIGHT DUTY TABLE 1 - DIMENSIONS MS DASH NO.B BORE 2/ BORE TOLERANCE DOUTSIDE DIAMETER +.0000 -.0010 1
9、/ 2/ WWIDTHINNERRING+.000 -.005 1/ HWIDTHOUTERRING+.000 -.005 1/ (A) SHOULDERDIAMETERINNER RING(APPROX) E4/ C3/ K TO SHARP CORNER (REF) JBRG.SPHERE OUTSIDE DIAMETER LMISALIGNMENT ANGLE EITHER DIRECTION 5/ WEIGHT POUNDS(APPROX)CORNER CHAMFER X 45INNER RING BORE+.015 -.000 OUTER RING OD +.015 -.000 -1
10、6 1.0000 +.0000 -.0005 1.9375 .437 .375 1.141 .024 .024 1.709 1.740 7 25 .18 -21 1.3125 +.0005 -.0005 2.2500 1.454 2.028 2.052 6 30 .20 -23 1.4375 2.3750 1.575 2.155 2.178 6 .22 -25 1.5625 2.5000 1.693 2.282 2.302 5 45 .25 -29 1.8125 2.7500 1.931 2.535 2.552 5 .27 -33 2.0625 3.0000 2.231 2.787 2.802
11、 5 .30 -37 2.3125 3.2500 2.468 3.039 3.052 4 30 .33 -47 2.9375 4.1250 .531 .469 3.093 .039 .039 3.846 3.865 4 30 .64 -48 3.0000 4.2500 3.222 3.972 3.990 4 .69 -49 3.0625 4.2500 3.222 3.972 3.990 4 .69 1/ ALL DIMENSIONS TO BE MET AFTER PLATING. 2/ OUT-OF-ROUND TOLERANCES: BORE: -16 +.0003,-.0008 -21
12、THROUGH -49 +.0008, -.0008 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. 5/ MISALIGNMENT ANGLE IS NOT TO EXCEED MINIMUM REQUIREMENT IN
13、DESIGN OR APPLICATION. TABLE 2 - LOADS AND STARTING TORQUE MS DASH NO.RADIAL LIMIT LOAD RATING LB THRUST LIMIT LOAD RATING LB 6/ 7/ RADIAL LOAD RATING (LB) FOR AVERAGE LIFE OF 10 000 COMPLETE 90 CYCLES8/ MAXIMUM STARTING TORQUE (in-oz) CASE I CASE II -16 8085 1600 4260 3960 5.0 -21 9840 2000 4590 42
14、90 7.0 -23 10 500 2200 4650 4360 9.0 -25 11 300 2300 4680 4420 9.0 -29 12 700 2600 4760 4530 14.0 -33 14 400 2900 4820 4630 14.0 -37 15 800 3200 4880 4690 20.0 -47 24 700 5000 6600 6390 30.0 -48 27 500 5500 8150 7840 30.0 -49 27 500 5500 8150 7840 32.0 6/ CASE I - LOAD FIXED WITH RESPECT TO OUTER RI
15、NG. CASE II - LOAD FIXED WITH RESPECT TO INNER RING. 7/ THESE RATINGS ARE FOR OPERATION UP TO 250 F. FOR OPERATION UP TO 350 F, THE RATINGS SHALL BE REDUCED BY 20%. 8/ SPECIFIED LIMITS ARE FOR BEARINGS LUBRICATED WITH MIL-PRF-81322 GREASE. FOR BEARINGS LUBRICATED WITH MIL-PRF-23827 TYPE I GREASE, TH
16、E TORQUE LIMIT SHALL BE THE SPECIFIED VALUE IN THE TABLE MULTIPLIED BY 1.2. AEROSPACE STANDARD AS27648SHEET 4 OF 5REV. DBEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTERNAL SELF ALIGNING, EXTRA LIGHT DUTY REQUIREMENTS: 1. MATERIAL: RINGS AND BALLS: 52100 STEEL PER AMS6440 OR AMS6444 SEALS: POLYTETRAFLUO
17、ROETHYLENE (PTFE) PER AMS3652 SEAL RETAINERS: ANY CORROSION RESISTANT STEEL 2. 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-23827 TYPE I IS REQUIRED, ADD THE LETTER “G
18、“ AFTER THE MS27648 DASH NUMBER. MIL-PRF-23827 TYPE I SHALL NOT BE USED FOR OPERATION WHERE TEMPERATURES EXCEED 250 F. 3. HARDNESS: HEAT TREAT RINGS AND BALLS TO 60-66 HRC AND STABILIZE FOR OPERATION AT 250 F 4. SURFACE ROUGHNESS: RACEWAYS AND BALL SHALL HAVE A MAXIMUM SURFACE ROUGHNESS OF 8 MICROIN
19、CHES Ra PER ANSI/ASME B46.1 5. PLATING: ALL EXTERNAL SURFACES EXCEPT BORE, SEALS AND SEAL RETAINERS SHALL BE PLATED .0003 TO .0006 THICK WITH: (NO DESIGNATOR) CADMIUM IN ACCORDANCE WITH AMS-QQ-P-416, TYPE I, CLASS 2 DESIGNATOR “E” ZINC-NICKEL IN ACCORDANCE WITH AMS2417, TYPE 2, GRADE B 6. RADIAL INT
20、ERNAL CLEARANCE: .0003 TO .0010, DOES NOT INCLUDE RADIAL LOOSENESS BETWEEN THE BEARING OUTER RING AND SELF-ALIGNING RING 7. RADIAL ECCENTRICITY: INNER RING, .0010 MAX, OUTER RING, .0016 MAX. 8. LATERAL ECCENTRICITY: INNER RING, .0010 MAX, OUTER RING, .0016 MAX. 9. PART NUMBER: THE PART NUMBER SHALL
21、BE SEQUENCED LEFT TO RIGHT WITH DESIGNATIONS IN THE FOLLOWING SEQUENCE: EXAMPLE OF PART NUMBER: MS27648 -16GE = BEARING, BALL, AIRFRAME, ANTIFRICTION, EXTERNAL SELF-ALIGNING, EXTRA LIGHT DUTY 1.0000 INCH +.0000, -.0005 BORE, .0003 TO .0010 INCH RADIAL INTERNAL CLEARANCE, FILLED 80% MINIMUM WITH MIL-
22、PRF-23827 TYPE I LUBRICANT, 250 F MAX. WITH ZINC-NICKEL PLATING ZINC-NICKEL PLATING (SEE PLATING DESIGNATOR) LUBRICANT (SEE LUBRICANT DESIGNATOR) DASH NUMBER (SEE TABLE 1) BASIC PART NUMBER AEROSPACE STANDARD AS27648SHEET 5 OF 5REV. DBEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTERNAL SELF ALIGNING, EX
23、TRA LIGHT DUTY 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, UNLESS OTHERWISE SPECIFIED 2. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS SPECIFI
24、CATION 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. A CHANGE BAR (l) LOCATED IN THE LEFT MARGIN IS FOR THE CONVENIENCE OF THE USER IN LOCATING AREAS WHERE TECHNICAL REVISIONS, NOT E
25、DITORIAL 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.
