SAE AS81820-2D-2014

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AEROSPACE STANDARD

BEARING, PLAIN, SELF-ALIGNING, SELF-

LUBRICATING, LINED BORE, LOW SPEED, WIDE,

CHAMFERED RACE, -65 TO +325 °F

AS81820/2

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: CustomerService@sae.org SAE WEB ADDRESS: http://www.sae.org

ISSUED 1998-04 REVISED 2014-07

THIRD ANGLE PROJECTION

CUSTODIAN: ACBG

REV.

FEDERAL SUPPLY CLASS

3120

AS81820/2

SHEET 1 OF 4 REV.

PROCUREMENT SPECIFICATION: AS81820

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely

voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.

SAE values your input. To provide feedback

on this Technical Report, please visit

http://www.sae.org/technical/standards/AS81820/2D

RATIONALE

THE REASON FOR UPDATING THIS SPECIFICATION IS TO ADD A 440C BALL MATERIAL OPTION AND REMOVE

CHROME PLATING AS AN OPTION.

FIGURE 1 - PART CONFIGURATION

TABLE 1 - DIMENSIONS AND STRENGTHS

PART

NO.**

+.0000

.0010

+.0000

.0005 H

±.005 Qº

(REF)

+.000

.002

STATIC LIMIT

LOAD OSCIL-

LATING

LOAD

NO-LOAD

ROTATIONAL

BREAKAWAY TORQUE

IN-LB WT

MAX

(REF)

RADIAL

LB AXIAL

LB STANDARD

"K" TYPE

M81820/2- 5 .3135 .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 .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 1.0010 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 AFTER

THE PART NUMBER (E.G., M81820/2A-5).

AEROSPACE STANDARD AS81820/2

SHEET 2 OF 4 REV.

BEARING, PLAIN, 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

PART

NO. 3/ NOMINAL

SIZE

OVERSIZE

(.010) IDPART

NO. 3/ NOMINAL

SIZE

OVERSIZE

(.020) ID

M81820/2- 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- 9U .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,

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 A BEARINGS, THE CORRESPONDING PART NUMBER WILL HAVE AN “A”

DESIGNATION AFTER THE PART NUMBER (E.G., M81820/2A-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 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 PLATING 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 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 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. 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 AS81820/2

SHEET 3 OF 4 REV.

BEARING, PLAIN, SELF-ALIGNING, SELF-

LUBRICATING, 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 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 NO. 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

THIS DOCUMENT REFERENCES A PART WHICH CONTAINS CADMIUM AS A PLATING MATERIAL. CONSULT LOCAL OFFICIALS IF YOU

HAVE QUESTIONS CONCERNING CADMIUM'S 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 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 “øD” TO BE MET AFTER PLATING. 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 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 “ 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).

ABSENCE OF THE LETTER “ A “ INDICATES TESTED TO 25 000 CYCLES

LETTER “ A “ INDICATES TESTED TO 100 000 CYCLES

BASIC PART NUMBER.

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摘要：

SAE AS81820-2D-2014 是航空航天领域的重要标准规范，全称为“连接器、插座、电气、矩形、微型、极性锁定、机架与面板型”。该标准由国际自动机工程师学会（SAE International）发布，旨在规范用于航空电子设备、空间系统及军事装备的微型矩形电连接器设计与性能要求。AMC（AS81820-2D）涵盖接触件排列、绝缘体结构、极性锁定机制及环境密封等关键技术参数，确保连接器在高温、振动、湿气及电磁干扰等严苛条件下仍保持可靠电气与机械连接。该标准替代了早期版本（如AS81820-2

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