1、AEROSPACE STANDARD BEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, CHAMFERED RACE, -65 TO +325 F AS81820/2Copyright 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
2、 any means, electronic, 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.s
3、ae.org ISSUED1998-04REVISED2014-07THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.DFEDERAL SUPPLY CLASS 3120 AS81820/2SHEET 1 OF 4REV. DPROCUREMENT SPECIFICATION: AS81820SAE Technical Standards Board Rules provide that: “This report is publishedbySAEtoadvance thestateoftechnical and engineeringsciences.
4、The useofthis 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, stabil
5、ized, 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/AS81820/2DRATIONALE THE REASON FOR UPDATING THIS SPECIFICATION IS TO ADD A 440C BALL MATERIAL OPTION AND REMOVE
6、 CHROME PLATING AS AN OPTION. FIGURE 1 - PART CONFIGURATION TABLE 1 - DIMENSIONS AND STRENGTHS PARTNO.* IB+.0000 .0010 ID+.0000 .0005 H.005Q (REF)W+.000.002STATIC LIMIT LOAD OSCIL-LATINGLOAD LBNO-LOAD ROTATIONAL BREAKAWAY TORQUEIN-LB WT LBMAX(REF)RADIALLBAXIALLB STANDARD *“K“ TYPEM81820/2- 5 .3135 .
7、6875 .317 14 .437 9250 1640 4450 1.0-15.0 0-1.0 .035 M81820/2- 6 .3760 .8125 .406 8 .500 13 000 2630 6200 1.0-15.0 0-1.0 .060 M81820/2- 7 .4385 .9375 .442 10 .562 17 250 3650 8250 1.0-15.0 0-1.0 .080 M81820/2- 8 .5010 1.0000 .505 9 .625 21 400 4970 10 600 1.0-15.0 0-1.0 .100 M81820/2- 9 .5635 1.1250
8、 .536 10 .687 26 600 5370 13 200 1.0-15.0 0-1.0 .135 M81820/2-10 .6260 1.1875 .567 12 .750 29 000 6130 16 150 1.0-15.0 0-1.0 .160 M81820/2-12 .7510 1.3750 .630 13 .875 37 000 7730 24 800 1.0-15.0 0-1.0 .240 M81820/2-14 .8760 1.6250 .755 6 .875 56 000 10 800 26 750 1.0-25.0 0-2.0 .350 M81820/2-16 1.0
9、010 2.1250 1.005 12 1.375 103 300 19 300 49 300 1.0-25.0 0-2.0 .970 * SEE REQUIREMENT 5 “NO-LOAD TORQUE“ AND NOTE 5. * FOR TYPE A BEARINGS, THE CORRESPONDING PART NUMBER WILL HAVE AN “A” DESIGNATION AFTERTHE PART NUMBER (E.G., M81820/2A-5). AEROSPACE STANDARD AS81820/2SHEET 2 OF 4REV. DBEARING, PLAI
10、N, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, CHAMFERED RACE, -65 TO +325 F TABLE 2 - OVERSIZE BEARING DIMENSIONS 1/ 2/ RESTRICTED USAGE FOR REPAIR WORK ONLY .010 INCH AND .020 INCH OVERSIZE OUTSIDE DIAMETER FOR REPLACEMENT OF BEARINGS SHOWN ON SHEET 1 PARTNO. 3/ NOMINAL SIZE1STO
11、VERSIZE (.010) IDPARTNO. 3/ NOMINAL SIZE2NDOVERSIZE (.020) IDM81820/2- 5T .3125 .6975 M81820/2- 5U .3125 .7075 M81820/2- 6T .3750 .8225 M81820/2- 6U .3750 .8325 M81820/2- 7T .4375 .9475 M81820/2- 7U .4375 .9575 M81820/2- 8T .5000 1.0100 M81820/2- 8U .5000 1.0200 M81820/2- 9T .5625 1.1350 M81820/2- 9
12、U .5625 1.1450 M81820/2-10T .6250 1.1975 M81820/2-10U .6250 1.2075 M81820/2-12T .7500 1.3850 M81820/2-12U .7500 1.3950 M81820/2-14T .8750 1.6350 M81820/2-14U .8750 1.6450 M81820/2-16T 1.0000 2.1350 M81820/2-16U 1.0000 2.1450 1/ BEFORE INITIATING A REPAIR PROCEDURE TO USE AN OVERSIZE BEARING, APPROVA
13、L FOR MODIFYING AND REIDENTIFYING THE BEARING HOUSING MUST BE OBTAINED FROM THE COGNIZANT ENGINEERING AUTHORITY. 2/ REFER TO NAS0331 FOR INSTALLATION PROCEDURE AND STAKING FORCES. 3/ FOR TYPE A BEARINGS, THE CORRESPONDING PART NUMBER WILL HAVE AN “A” DESIGNATION AFTER THE PART NUMBER (E.G., M81820/2
14、A-5). REQUIREMENTS: 1. MATERIAL: BALL: 440C (AMS5630, AMS5880, OR AMS5618) OR PH13-8 CRES PER AMS5629 (SEE NOTE 5 FOR P/N EXAMPLE AND DESIGNATION). RACE: 17-4PH CRES PER AMS5643. LINER: PTFE SHALL BE INCLUDED IN THE LINER.2. SURFACE TEXTURE: BALL DIA Ra 8 MAX; BALL FACES AND RACE DIA Ra 32 MAX; ALL
15、OTHER METALLIC SURFACES Ra 125 MAX. LINER SURFACES ARE EXEMPT FROM SURFACE TEXTURE MEASUREMENTS. 3. SURFACE FINISH: RACE: PLATING, WHEN SPECIFIED, SHALL BE ZINC-NICKEL PLATING PER AMS2417, TYPE 2 GRADE A OR B (ONLY GRADE B SHALL BE PERMITTED ON BEARINGS MANUFACTURED AFTER JUNE 1, 2015) OR CADMIUM PL
16、ATING PER AMS-QQ-P-416, TYPE II, CLASS 2 WITH A THICKNESS RANGE OF .0003 TO .0006 INCH. PLATING SHALL BE ON THE OUTSIDE DIAMETER SURFACE AND ON THE FLAT BETWEEN THE OUTSIDE DIAMETER AND THE GROOVE. THE PLATING RUNOUT SHALL OCCUR EITHER IN THE GROOVE OR IN THE SIDE FACE AREA BETWEEN THE GROOVE AND TH
17、E BALL. SEE NOTE 5 FOR P/N EXAMPLE AND DESIGNATION. THE PTFE LINER IN THE OUTER RACE INSIDE DIAMETER AND IN THE BALL BORE SHALL BE PROTECTED FROM EXPOSURE TO PLATING SOLUTIONS DURING PROCESSING. BALL: PASSIVATE BALL AS DETAIL PER AMS2700, METHOD 1 (NITRIC ACID) OR METHOD 2 (CITRIC ACID), OR ASTM A96
18、7. CITRIC 1, CITRIC 2, AND CITRIC 3 ARE ACCEPTABLE. BALL SURFACE FINISH SHALL BE AS ORIGINALLY QUALIFIED. 4. HARDNESS: BALL 440C HRC 55-62 OR PH13-8 HRC 43 MIN; RACE: HRC 28 MIN, HRC 37 MAX BEFORE SWAGING. AEROSPACE STANDARD AS81820/2SHEET 3 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING
19、, LINED BORE, LOW SPEED, WIDE, CHAMFERED RACE, -65 TO +325 F 5. NO-LOAD TORQUE: WHEN THE LETTER “K” IS PRESENT IN THE PART NUMBER, LOWER VALUES OF NO-LOAD TORQUE ARE SPECIFIED PER TABLE 1. IF THE MEASURED TORQUE OF A “K” TYPE BEARING IS LESS THAN .1 INCH-POUND, THE INTERNAL RADIAL CLEARANCE SHALL BE
20、 MEASURED AND SHALL NOT EXCEED THE VALUES IN TABLE 3. THESE REQUIREMENTS APPLY TO THE TORQUE AND INTERNAL PLAY BETWEEN THE SPHERICAL BALL AND THE OUTER RING. THIS STANDARD DOES NOT DEFINE REQUIREMENTS FOR TORQUE OR INTERNAL PLAY BETWEEN THE BEARING BORE AND SHAFT. TABLE 3 - INTERNAL CLEARANCE DASH N
21、O. MAXIMUM RADIAL PLAY MAXIMUM AXIAL PLAY -5K THRU -12K .0007 INCH .0021 INCH -14K THRU -16K .0010 INCH .0030 INCH 6. BREAK SHARP EDGES AND CORNERS AND REMOVE ALL BURRS AND SLIVERS. 7. DIMENSIONS ARE IN INCHES. UNLESS OTHERWISE SPECIFIED, TOLERANCES ARE; DECIMALS .010 AND ANGLES .5q .NOTES: NOTICE T
22、HIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE QUESTIONS CONCERNING CADMIUMS USE. 1. WHEN TESTED TO THE FLUID CONTAMINATION AND SUB-ZERO TEMPERATURE REQUIREMENTS OF THE PROCUREMENT SPECIFICATION, THE OSCILLATING LOAD SHALL BE DECREASE
23、D TO 75% OF THE SPECIFIED LOAD. 2. WHEN FLUIDS AND ELEVATED TEMPERATURES (ABOVE 200 F) ARE BOTH PRESENT IN AN APPLICATION, THEN REDUCTIONS IN OPERATING LOADS OR BEARING LIFE MAY BE REQUIRED. 3. DASH NUMBER DESIGNATES NOMINAL BORE DIA IN SIXTEENTHS OF AN INCH. 4. DIMENSION “D” TO BE MET AFTER PLATING
24、. DIMENSION “H“ TO BE MET BEFORE PLATING WHEN APPLICABLE. 5. EXAMPLE OF PART NO. M81820/2 A -6 P K T D = .375 NOMINAL BORE DIA, PH13-8MO BALL MATERIAL, ZINC-NICKEL PLATED, LOW TORQUE, .010 INCH OVERSIZE O.D. (DIMENSION D). ABSENCE OF LETTER INDICATES PH13-8 BALL OPTION LETTER “D” INDICATES 440C BALL
25、 OPTION ABSENCE OF THE LETTERS “ T “ AND “ U “ INDICATE STANDARD OUTER DIAMETER ( D), (SEE TABLE 1). T = .010 INCH OVERSIZE D (FOR REPAIR ONLY, SEE TABLE 2). U = .020 INCH OVERSIZE D (FOR REPAIR ONLY, SEE TABLE 2). ABSENCE OF THE LETTER “ K “ INDICATES STANDARD BREAKAWAY TORQUE (SEE TABLE 1). LETTER
26、 “ K “ INDICATES LOW BREAKAWAY TORQUE (SEE TABLE 1). ABSENCE OF THE LETTERS “ P “ AND “ E “ INDICATES NO PLATING. LETTER “ P “ INDICATES ZINC-NICKEL OR CADMIUM PLATING (SEE REQUIREMENT 3). LETTER “ E “ INDICATES ZINC-NICKEL PLATING ONLY (SEE REQUIREMENT 3) SIZE BORE DIAMETER (DASH NO. FROM TABLE 1).
27、 ABSENCE OF THE LETTER “ A “ INDICATES TESTED TO 25 000 CYCLES LETTER “ A “ INDICATES TESTED TO 100 000 CYCLES BASIC PART NUMBER. AEROSPACE STANDARD AS81820/2SHEET 4 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, CHAMFERED RACE, -65 TO +325 F 6. IN THE EVENT
28、 OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE REFERENCES CITED HEREIN, THE TEXT OF THIS STANDARD SHALL TAKE PRECEDENCE. 7. REFERENCED GOVERNMENT (OR NON-GOVERNMENT) DOCUMENTS OF THE ISSUE LISTED IN THAT ISSUE OF THE DEPARTMENT OF DEFENSE INDEX OF SPECIFICATIONS AND STANDARDS DODISS SPECIF
29、IED IN THE SOLICITATION FORM A PART OF THIS STANDARD TO THE EXTENT SPECIFIED HEREIN. 8. A CHANGE BAR (l) 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.
