1、AEROSPACE STANDARD BEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, GROOVED RACE, -65 TO +325 F AS81820/3Copyright 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 a
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3、.org ISSUED 1998-04REVISED 2014-07THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.DFEDERAL SUPPLY CLASS 3120 AS81820/3SHEET 1 OF 4REV. DPROCUREMENT SPECIFICATION: AS81820SAE Technical Standards Board Rules provide that: “This report ispublishedby SAE toadvance thestate of technicalandengineeringsciences.
4、The useofthis reportisentirelyvoluntary, andits applicability and suitability forany particular use,including any patent infringement arising therefrom, isthe soleresponsibilityofthe user.”SAE reviews eachtechnicalreport at least every five years at which time itmay berevised,reaffirmed, stabilized,
5、 orcancelled. SAE invites yourwrittencomments andsuggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS81820/3DRATIONALE THE REASON FOR UPDATING THIS SPECIFICATION IS TO ADD A 440C BALL MATERIAL OPTION AND REMOVE CHROME
6、PLATING AS AN OPTION. FIGURE 1 - PART CONFIGURATION TABLE 1 - DIMENSIONS AND STRENGTHS PART NO.*IB+.0000 .0010 ID+.0000 .0005 H.005 P+.000.010Q(REF)W+.000.002IE+.000.008STATIC LIMIT LOAD OSCIL-LATINGLOAD LB NO-LOAD ROTATIONAL BREAKAWAY TORQUEIN-LB WT LB MAX (REF)RADIALLB AXIALLB STANDARD *“K“ TYPEM8
7、1820/3- 5 .3135 .6875 .317 .025 14 .437 .625 9300 1640 4450 1.0-15.0 0-1.0 .035 M81820/3- 6 .3760 .8125 .406 .035 8 .500 .712 13 000 2630 6200 1.0-15.0 0-1.0 .060 M81820/3- 7 .4385 .9375 .442 .035 10 .562 .837 17 300 3650 8250 1.0-15.0 0-1.0 .080 M81820/3-7A .4385 .9062 .442 .035 10 .562 .806 17 300
8、 3650 8250 1.0-15.0 0-1.0 .080 M81820/3- 8 .5010 1.0000 .505 .035 9 .625 .900 21 400 4970 10 600 1.0-15.0 0-1.0 .100 M81820/3- 9 .5635 1.1250 .536 .035 10 .687 1.025 26 600 5370 13 200 1.0-15.0 0-1.0 .135 M81820/3-10 .6260 1.1875 .567 .035 12 .750 1.087 29 000 6130 16 150 1.0-15.0 0-1.0 .160 M81820/
9、3-12 .7510 1.3750 .630 .055 13 .875 1.251 37 000 7730 24 800 1.0-15.0 0-1.0 .240 M81820/3-14 .8760 1.6250 .755 .055 6 .875 1.501 56 000 10 800 26 750 1.0-25.0 0-2.0 .350 M81820/3-16 1.0010 2.1250 1.005 .055 12 1.375 2.001 103 000 19 300 49 300 1.0-25.0 0-2.0 .970 * SEE REQUIREMENT 5 “NO-LOAD TORQUE“
10、 AND NOTE 5. * FOR TYPE A BEARINGS, THE CORRESPONDING PART NUMBER WILL HAVE AN “A” DESIGNATION AFTER THE PART NUMBER (E.G., M81820/3A-5). AEROSPACE STANDARD AS81820/3SHEET 2 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, GROOVED RACE, -65 TO +325 F TABLE 2 -
11、 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 SIZE1STOVERSIZE (.010) IDPARTNO. 3/ NOMINAL SIZE2NDOVERSIZE (.020) IDM81820/3- 5T .3125 .6975 M81820/3- 5U .3125
12、.7075 M81820/3- 6T .3750 .8225 M81820/3- 6U .3750 .8325 M81820/3- 7T .4375 .9475 M81820/3- 7U .4375 .9575 M81820/3-7AT .4375 .9162 M81820/3-7AU .4375 .9262 M81820/3- 8T .5000 1.0100 M81820/3- 8U .5000 1.0200 M81820/3- 9T .5625 1.1350 M81820/3- 9U .5625 1.1450 M81820/3-10T .6250 1.1975 M81820/3-10U .
13、6250 1.2075 M81820/3-12T .7500 1.3850 M81820/3-12U .7500 1.3950 M81820/3-14T .8750 1.6350 M81820/3-14U .8750 1.6450 M81820/3-16T 1.0000 2.1350 M81820/3-16U 1.0000 2.1450 1/ BEFORE INITIATING A REPAIR PROCEDURE TO USE AN OVERSIZE BEARING, APPROVAL FOR MODIFYING AND REIDENTIFYING THE BEARING HOUSING M
14、UST 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., M81820/3A-5). REQUIREMENTS: 1. MATERIAL: BALL: 440C (AMS5630, A
15、MS5880, 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 OTHER METALLIC SURFACES Ra 125 MAX. LINER SURFACES ARE
16、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 PLATING PER AMS-QQ-P-416, TYPE II, CLASS 2 WITH A THICKNE
17、SS 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 THE BALL. SEE NOTE 5 FOR P/N EXAMPLE AND DESIGNATION. THE
18、 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 A967. CITRIC 1, CITRIC 2, AND CITRIC 3 ARE ACCEPTABLE. BAL
19、L 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 AS81820/3SHEET 3 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, GROOVED RACE, -65 TO +32
20、5 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 MEASURED AND SHALL NOT EXCEED THE VALUES IN TABLE 3. THE
21、SE 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 NO. MAXIMUM RADIAL PLAY MAXIMUM AXIAL PLAY -5K THRU -12K .
22、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 THIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A
23、 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 DECREASED TO 75% OF THE SPECIFIED LOAD. 2. WHEN FLUIDS AND ELEVATE
24、D 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. DIMENSION “H“ TO BE MET BEFORE PLATING WHEN APPLICABLE.
25、5. EXAMPLE OF PART NO. M81820/3 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 OPTION ABSENCE OF THE LETTERS “ T “ AND “ U “ INDICATE ST
26、ANDARD 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 “ K “ INDICATES LOW BREAKAWAY TORQUE (SEE TABLE 1). ABSEN
27、CE 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). ABSENCE OF THE LETTER “ A “ INDICATES TESTED TO 25 000 C
28、YCLES LETTER “ A “ INDICATES TESTED TO 100 000 CYCLES BASIC PART NUMBER. AEROSPACE STANDARD AS81820/3SHEET 4 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, WIDE, GROOVED RACE, -65 TO +325 F 6. IN THE EVENT OF A CONFLICT BETWEEN THE TEXT OF THIS STANDARD AND THE RE
29、FERENCES 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 SPECIFIED IN THE SOLICITATION FORM A PART OF THIS STANDARD TO THE
30、 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.
