SAE AS81820D-2014

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AEROSPACE

STANDARD

AS81820 REV. D

Issued 1998-03

Revised 2014-07

Superseding AS81820C

Bearings, Plain, Self-Aligning, Self-Lubricating,

Low Speed Oscillation

RATIONALE

The reason for updating this document is to clarify the requirements for the subzero testing for Type A bearing

qualification, mandate passivation for 440C balls after June 1, 2015, add Liquid Nitrogen testing requirements and to

remove chrome plating on the ball OD.

1. SCOPE

This SAE Aerospace Standard (AS) covers plain spherical bearings which are self-aligning and self-lubricating by utilizing

polytetrafluoroethylene (PTFE) in a fabric composite or molded material that is bonded to the inner diameter surface of the

race and when specified, to the bore diameter surface of the ball. These bearings are for use in the temperature range -65

to +325 °F (-54 to +163 °C).

2. APPLICABLE DOCUMENTS

The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications

shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the

event of conflict between the text of this document and references cited herein, the text of this document takes

precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption

has been obtained.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or 724-776-4970 (outside USA), www.sae.org.

AS1241 Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft

ARP5448/4 Plain Bearing Bond Integrity - Peelable Woven Fabric PTFE Liners

ARP5448/5 Plain Bearing No-Load Rotational Breakaway Torque Measurement

ARP5448/8 Plain Spherical Bearing Radial and Axial Clearance Measurement

ARP5448/9 Plain Bearing Lined Inside Diameter Plug Gaging

SAE INTERNATIONAL AS81820D Page 2 of 23

AS8243 Anti-Icing and Deicing - Defrosting Fluids

AS8942 Bearings, Plain and PTFE Lined, Self-Aligning

AS14101 Bearing, Plain, Self-Lubricating, Self-Aligning, Low Speed, Narrow, Grooved Race, -65 to +325 °F

AS14102 Bearing, Plain, Self-Lubricating, Self-Aligning, Low Speed, Wide, Chamfered Race, -65 to +325 °F

AS14103 Bearing, Plain, Self-Lubricating, Self-Aligning, Low Speed, Wide, Grooved Race, -65 to +325 °F

AS14104 Bearing, Plain, Self-Lubricating, Self-Aligning, Low Speed, Narrow, Chamfered Race, -65 to +325 °F

AS81820/1 Bearing, Plain, Self-Aligning, Self-Lubricating, Lined Bore, Low Speed, Narrow, Grooved Race, -65 to

+325 °F

AS81820/2 Bearing, Plain, Self-Aligning, Self-Lubricating, Lined Bore, Low Speed, Wide, Chamfered Race, -65 to

+325 °F

AS81820/3 Bearing, Plain, Self-Aligning, Self-Lubricating, Lined Bore, Low Speed, Wide, Grooved Race, -65 to

+325 °F

AS81820/4 Bearing, Plain, Self-Aligning, Self-Lubricating, Lined Bore, Low Speed, Narrow, Chamfered

Race, -65 to +325 °F

AMS1424 Deicing/Anti-Icing Fluid, Aircraft, SAE Type I

AMS2417 Plating, Zinc-Nickel Alloy

AMS2700 Passivation of Corrosion Resistant Steels

AMS5629 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Rings, and Extrusions, 13Cr - 8.0Ni - 2.2Mo - 1.1Al,

Vacuum Induction Plus Consumable Electrode Melted, Solution Heat Treated, Precipitation

Hardenable

AMS-QQ-P-416 Plating, Cadmium (Electrodeposited)

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel:

610-832-9585, www.astm.org.

ASTM F25 Standard Test Method for Sizing and Counting Airborne Particulate Contamination in Clean Rooms and

Other Dust Controlled Areas Designed for Electronic and Similar Applications

ASTM F50 Standard Practice for Continuous Sizing and Counting of Airborne Particles in Dust Controlled Areas

Using Instruments Based Upon Light Scattering Principles

ASTM C794 Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealant

ASTM A967 Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts

SAE INTERNATIONAL AS81820D Page 3 of 23

2.3 ASME Publications

Available from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-

800-843-2763 (Mexico), 973-882-1170 (outside North America), www.asme.org.

ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay)

ASME Y14.24 Types and Applications of Engineering Drawings

ASME Y14.34M Associated Lists

ASME Y14.35M Revision of Engineering Drawings and Associated Documents

ASME Y14.100 Engineering Drawing Practices

2.4 U.S. Government Publications

Available from DLA Document Services, Bldg 4/D, 700 Robbins Ave, Philadelphia, PA 19111, Tel: 215-697-6396,

http://quicksearch.dla.mil/ or http://www.assistdocs.com/search/search_basic.cfm.

MIL-STD-129 DoD Standard Practice Military Marking for Shipment and Storage

MIL-DTL-197 Packaging of Bearings, Anti-Friction, Associated Parts and Sub-Assemblies

MIL-STD-2073-1 Standard Practice for Military Packaging

MIL-PRF-5606 Hydraulic Fluid, Petroleum Base; Aircraft, Missile and Ordnance

MIL-DTL-5624 Turbine Fuel, Aviation, Grades JP-5 and JP-5/JP-8 ST

MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number O-148

MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric, NATO Code Number

H-537

3. REQUIREMENTS

3.1 Qualification

Bearings furnished under this standard shall be products which are authorized by the qualifying activity for listing on the

applicable Qualified Products List (QPL-AS81820) at the time of award of contract (see 4.3 and 6.3). See Qualified

Products Database (QPD) at http://quicksearch.dla.mil/, or http://www.assistdocs.com/search/search_basic.cfm.

3.2 Materials

The ball, race and liner shall conform to the applicable AS sheet.

3.2.1 Plating

When specified, plating of the race shall be Zinc-Nickel plating in accordance with AMS2417 Type 2 Grade A or B and the

applicable drawing or Cadmium plating per AMS-QQ-P-416 Type II, Class 2 and the applicable drawing.

When AMS2417 is specified, only Type 2 Grade B shall be permitted on bearings manufactured after June 1, 2015.

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摘要：

SAE AS81820D-2014 是航空航天领域高性能无扩口流体连接件的技术标准规范，由国际自动机工程师学会（SAE International）发布，取代了之前的版本（AS81820C）。该标准详细规定了适用于飞机液压、燃油和气动系统的无扩口管接头的设计、材料、尺寸、性能测试及质量保证要求，涵盖从不锈钢到钛合金等多种材质，并明确了拧紧力矩、抗振性、耐压性和密封性等关键指标。AS81820D 版本的更新进一步提升了连接件的疲劳寿命和安装可靠性，确保在极端温度与压力环境下仍能保持无泄漏性能。对于

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