1、AEROSPACE STANDARD BEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, NARROW,CHAMFERED RACE, -65 TO +325 F AS81820/4Copyright 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 b
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3、sae.org ISSUED 1998-04REVISED 2014-07THIRD ANGLE PROJECTION CUSTODIAN: ACBG REV.DFEDERAL SUPPLY CLASS 3120 AS81820/4SHEET 1 OF 4REV. DPROCUREMENT SPECIFICATION: AS81820SAE Technical Standards Board Rules provide that: “This report ispublishedby SAE toadvance thestate of technicalandengineeringscienc
4、es.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, stabiliz
5、ed, orcancelled. SAE invites yourwrittencomments andsuggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/AS81820/4DRATIONALE THE REASON FOR UPDATING THIS SPECIFICATION IS TO ADD A 440C BALL MATERIAL OPTION AND REMOVE CHRO
6、ME PLATING AS AN OPTION. FIGURE 1 - PART CONFIGURATION TABLE 1 - DIMENSIONS AND STRENGTHS PARTNO.* IB+.0000 .0010 ID+.0000 .0005 H.005 Q (REF)W+.000.002STATIC LIMIT LOAD OSCIL-LATINGLOAD LBNO-LOAD ROTATIONAL BREAKAWAY TORQUE IN-LB WT LBMAX(REF)RADIALLBAXIALLB STANDARD *“K“ TYPE M81820/4- 4 .2510 .65
7、62 .250 10 .343 5550 430 2650 1.0- 5.0 0-0.5 .020 M81820/4- 5 .3135 .7500 .281 10 .375 7700 700 3700 1.0-15.0 0-1.0 .030 M81820/4- 6 .3760 .8125 .312 9 .406 10 200 1100 4900 1.0-15.0 0-1.0 .040 M81820/4- 7 .4385 .9062 .343 8 .437 12 950 1400 6700 1.0-15.0 0-1.0 .050 M81820/4- 8 .5010 1.0000 .390 8 .
8、500 17 250 2100 8250 1.0-15.0 0-1.0 .070 M81820/4- 9 .5635 1.0937 .437 8 .562 22 150 3680 10 600 1.0-15.0 0-1.0 .090 M81820/4-10 .6260 1.1875 .500 8 .625 27 700 4720 13 250 1.0-15.0 0-1.0 .120 M81820/4-12 .7510 1.4375 .593 8 .750 40 600 6750 19 400 1.0-15.0 0-1.0 .210 M81820/4-14 .8760 1.5625 .703 8
9、 .875 55 950 9350 26 750 1.0-25.0 0-2.0 .270 M81820/4-16 1.0010 1.7500 .797 9 1.000 73 800 12 160 35 250 1.0-25.0 0-2.0 .390 * 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., M81820/4A-5). AE
10、ROSPACE STANDARD AS81820/4SHEET 2 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, NARROW, 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 REPLACEME
11、NT OF BEARINGS SHOWN ON SHEET 1 PARTNO. 3/ NOMINAL SIZE1STOVERSIZE (.010) IDPARTNO. 3/ NOMINAL SIZE2NDOVERSIZE (.020) IDM81820/4- 4T .2500 .6662 M81820/4- 4U .2500 .6762 M81820/4- 5T .3125 .7600 M81820/4- 5U .3125 .7700 M81820/4- 6T .3750 .8225 M81820/4- 6U .3750 .8325 M81820/4- 7T .4375 .9162 M8182
12、0/4- 7U .4375 .9262 M81820/4- 8T .5000 1.0100 M81820/4- 8U .5000 1.0200 M81820/4- 9T .5625 1.1037 M81820/4- 9U .5625 1.1137 M81820/4-10T .6250 1.1975 M81820/4-10U .6250 1.2075 M81820/4-12T .7500 1.4475 M81820/4-12U .7500 1.4575 M81820/4-14T .8750 1.5725 M81820/4-14U .8750 1.5825 M81820/4-16T 1.0000
13、1.7600 M81820/4-16U 1.0000 1.7700 1/ BEFORE INITIATING A REPAIR PROCEDURE TO USE AN OVERSIZE BEARING, APPROVAL 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
14、 A BEARINGS, THE CORRESPONDING PART NUMBER WILL HAVE AN “A” DESIGNATION AFTER THE PART NUMBER (E.G., M81820/4A-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
15、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 EXEMPT FROM SURFACE TEXTURE MEASUREMENTS. 3. SURFACE FINISH: RACE: PLATING, WHEN SPECIFIED, SHALL BE ZINC-NICKEL PLATING PER AMS2417, TY
16、PE 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 THICKNESS RANGE OF .0003 TO .0006 INCHES. PLATING SHALL BE ON THE OUTSIDE DIAMETER SURFACE AND ON THE FLAT BETWEEN THE OUTSIDE DIAMETER AND THE
17、 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 PTFE LINER IN THE OUTER RACE INSIDE DIAMETER AND IN THE BALL BORE SHALL BE PROTECTED FROM EXPOSURE TO PLATING SOLUTIONS DURING PROCES
18、SING. 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. 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
19、 BEFORE SWAGING. AEROSPACE STANDARD AS81820/4SHEET 3 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING, SELF- LUBRICATING, LINED BORE, LOW SPEED, NARROW, 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
20、 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. THESE REQUIREMENTS APPLY TO THE TORQUE AND INTERNAL PLAY BETWEEN THE SPHERICAL BALL AND THE OUTER RING. THIS STANDARD DOES NOT DEFINE
21、 REQUIREMENTS FOR TORQUE OR INTERNAL PLAY BETWEEN THE BEARING BORE AND SHAFT. TABLE 3 - INTERNAL CLEARANCE DASH NO. MAXIMUM RADIAL PLAY MAXIMUM AXIAL PLAY -4K THRU -12K .0007 INCH .0028 INCH -14K THRU -16K .0010 INCH .0040 INCH 6. BREAK SHARP EDGES AND CORNERS AND REMOVE ALL BURRS AND SLIVERS. 7. DI
22、MENSIONS 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 PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU HAVE QUESTIONS CONCERNING CADMIUMS USE. 1. WHEN TESTED TO THE FLUID CONTAMINATIO
23、N 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 ELEVATED TEMPERATURES (ABOVE 200 F) ARE BOTH PRESENT IN AN APPLICATION, THEN REDUCTIONS IN OPERATING LOADS OR BEARING LIFE MAY BE REQUIRE
24、D. 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. 5. EXAMPLE OF PART NO.: M81820/4 A -6 P K T D = .375 NOMINAL BORE DIA, PH13-8MO BALL MATERIAL, ZINC-NICKEL PLATED, LOW TORQUE, .01
25、0 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 STANDARD OUTER DIAMETER ( D), (SEE TABLE 1). T = .010 INCH OVERSIZE D (FOR REPAIR ONLY, SEE TABLE 2). U = .020 INCH OVERSIZE D (FOR REP
26、AIR 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). ABSENCE OF THE LETTERS “P“ AND “E” INDICATES NO PLATING. LETTER “P“ INDICATES ZINC-NICKEL OR CADMIUM PLATING (SEE REQUIREMENT 3). LETTER “E“ I
27、NDICATES 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 CYCLES LETTER “A“ INDICATES TESTED TO 100 000 CYCLES BASIC PART NUMBER. AEROSPACE STANDARD AS81820/4SHEET 4 OF 4REV. DBEARING, PLAIN, SELF-ALIGNING,
28、 SELF- LUBRICATING, LINED BORE, LOW SPEED, NARROW, CHAMFERED RACE, -65 TO +325 F 6. IN THE EVENT 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 LISTE
29、D 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 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 REV
30、ISIONS, 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.
