1、 AEROSPACE STANDARD Bearings, Roller, Rod End, Antifriction Self-Aligning FSC 3110 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 su
2、itability 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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Co
3、pyright 2005 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 any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT
4、 ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 1999-08 Revised 2005-02 Superseding AS8952 AS8952 REV.A 1. SCOPE: 1.1 This specification covers sealed, self-aligning, anti-friction, ro
5、d end roller bearings operating in the temperature range of -65 to +300 F (-54 to +149 C) and intermittent spikes to 350 F (177 C). 1.2 Classification: Bearings shall be of the following types, as specified (see 6.2): Type I External thread rod end bearings (AS21221, AS21223, AS21429) Type II Intern
6、al thread rod end bearings (AS21220) 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
7、order. In the event of conflict between the text of this document and references cited herein, the text of this docment 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
8、SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS-QQ-P-416 Plating, Cadmium (Electro Deposited) AMS 2417 Plating, Zinc-Nickel Alloy AS8879 Screw Threads, Controlled Radius Root With Increased Minor Diameters; General Specification For SAE AS8952 Revision A - 2 - 2.2 U.S. Government Publica
9、tions: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. MIL-DTL-197 Bearings, Antifriction, Associated Parts and Subassemblies, Packaging of MIL-STD-129 Marking for Shipment and Storage MIL-STD-130 Identification Marking of US Military
10、Property MIL-PRF-23827 Grease, Aircraft and Instrument, Gear and Actuator Screw MIL-PRF-81322 Grease, Aircraft, General Purpose Wide Temperature Range 2.3 ANSI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002. ANSI/ASME B46.1 Surface Texture (Surface Roughness, Wavines
11、s, and Lay) ANSI/ASQC Z1.4 Sampling Procedures and Tables for Inspection by Attributes 2.4 ASTM Publications: Available from ASTM, 100 Barr Harbor, West Conshohocken, PA 19428-2959. ASTM A 380 Practice for Cleaning and Descaling Stainless Steel Parts, Equipment, and Systems ASTM E 1444 Inspection, M
12、agnetic Particle 2.5 AIA Publications: Available from AIA, 1250 Eye Street N.W., Washington DC 20005. NAS 516 Fitting, Lubrication - 1/8 Inch Drive, Flush Type SAE AS8952 Revision A - 3 - 3. REQUIREMENTS: 3.1 Aerospace Standards (AS): The individual item requirements shall be as specified herein and
13、 in accordance with the applicable AS sheets. In the event of any conflict between requirements of this specification and the AS sheets, the latter shall govern. 3.2 Qualification: The bearings furnished under this specification shall be products which are qualified for listing on the applicable qua
14、lified products list at the time prior to the award of a contract (see Sections 4 and 6). 3.2.1 Product Change: Any change in product design, including raceway geometry or dimensions, rolling element dimensions, rolling element quantity, seals, materials or plant location shall be reported to the qu
15、alifying activity and will require requalification of the product to an extent determined by the qualifying activity. Any other specific changes which must be brought to the attention of the qualifying activity will be identified in the qualification notification letter. 3.2.2 Product Manufacture: T
16、he bearing manufacturer shall be capable of performing the majority of manufacturing operations in-house, but may subcontract these operations at its option. Component inspection shall be performed at the plant listed on the Qualified Products List (QPL). If manufacturing operations are performed in
17、 more than one plant, the manufacturers additional plant(s) shall be reported to the qualifying activity and will be listed accordingly on the QPL. The manufacturer is responsible for meeting all requirements of the specification and for the quality of the end product, whether it is manufactured tot
18、ally in-house or some of the operations are performed by a subcontractor. Inherent in the responsibility for the end product is the responsibility to verify that the subcontractors processes meet specification requirements. A change in subcontractor need not be reported to the qualifying activity un
19、less specifically identified in the qualification notification letter. NOTE: Bearings partly or completely manufactured in foreign countries shall be subject to the laws and procurement regulations pertaining to acquisition of foreign made products. 3.3 Material: The bearings shall conform to the ap
20、plicable AS sheets. 3.4 Design and Construction: Only factory new bearings conforming to requirements specified herein shall be furnished. SAE AS8952 Revision A - 4 - 3.4.1 Hardness: The inner ring and rollers shall be through-hardened and shall have a hardness of HRc 60 to 65. The outer raceway be
21、through-hardened or case-hardened and shall have a minimum hardness of HRc 60. Total case depth shall not exceed 50% of cross sectional area. Rod end shanks shall have a uniform cross sectional hardness with minimum hardness of HRc 27. 3.4.2 Surface Roughness: The sides of the inner ring shall have
22、a smooth, machined finish that will not exceed 125 microinches Ra. Otherwise, the surface roughness shall be as specified on the AS sheets. 3.4.3 Seals: Seals of contact type shall be provided to prevent entrance of dust and to retain the lubricant throughout the temperature range specified. The mat
23、erial shall be reinforced PTFE fiberglass or polyether-ester. 3.4.4 Relubrication Provisions: Provisions for lubrication shall be made by use of an external lubrication fitting as specified on the AS sheets. 3.4.5 Retainers: Roller retainers shall be made of steel, beryllium-copper, or copper alloy
24、in accordance with applicable AS sheets. 3.4.6 Rings: The outer rings shall be of single piece construction with the rod end shank. The inner ring shall be of single piece construction. 3.4.7 Threads: Threads shall conform to UNJF-3A and UNJF-3B in accordance with AS8879 for external and internal th
25、reads, respectively. 3.4.8 Lubrication: The bearings shall be thoroughly cleaned and dried before being lubricated. The bearings shall be filled with grease conforming to MIL-PRF-81322 or MIL-PRF-23827 so that at least eighty percent of the bearing void shall be filled. Bearings shall not have been
26、lubricated more than 36 months prior to date of delivery. The bearing shall be preserved with the operating lubricant or compatible oil per MIL-DTL-197. 3.4.9 Dimensions and Tolerances: Dimensions and tolerances shall be in accordance with the applicable AS sheets. 3.4.10 Shank Alignment: The point
27、representing the center of self-alignment motion shall be coincident with the axis of the rod end within .010 inch. 3.5 Performance: 3.5.1 Radial Strength: 3.5.1.1 Radial Limit Load Rating: When tested in accordance with 4.5.6, the bearing shall have a radial limit load rating of not less than the v
28、alue specified on the AS sheet. If starting torque increases by 100% or more, bearing shall be considered to have failed. SAE AS8952 Revision A - 5 - 3.5.1.2 Radial Ultimate Load: When tested in accordance with 4.5.7, the minimum static fracture capacity shall be not less than 1.5 times the radial l
29、imit load rating specified on the applicable AS sheet. Following the test, bearings that cannot be turned by hand, or that have fractured parts, shall be considered to have failed. 3.5.1.3 Radial Dynamic Load Rating: When tested in accordance with 4.5.8, the bearings shall have a radial dynamic load
30、 rating of not less than the values specified on the applicable AS sheet. A bearing shall be considered to have failed if any of the following defects are detected: wear of the outer raceway greater than .002 inches or .002 inches in radial displacement during dynamic testing; spalling, cracking det
31、ected by MPI, or fracture of any component. The bearings shall have a B50life of 10,000 cycles or the entire lot shall be considered to have failed the test. 3.5.2 Axial Strength: 3.5.2.1 Axial Limit Load Rating: When tested in accordance with 4.5.9, the bearing shall have an axial limit load rating
32、 of not less than the value specified on the applicable AS sheet. If starting torque increases by 100% or more, the bearings shall be considered to have failed. 3.5.2.2 Axial Ultimate Load: When tested in accordance with 4.5.10, bearings that cannot be turned by hand or that have parts fractured, sh
33、all be considered to have failed. 3.5.3 Radial Internal Clearance: When tested in accordance with 4.5.11, radial internal clearance measured before the radial limit load rating test (4.5.6) shall be as specified on the applicable AS sheet. 3.5.4 Axial Internal Clearance: When tested in accordance wi
34、th 4.5.12, axial internal clearance measured before the axial limit load rating test (4.5.9) shall be as specified on the applicable AS sheet. 3.5.5 Seal Performance: 3.5.5.1 Seal Test (Lubricant Retention): Bearings shall withstand the seal test specified in 4.5.13, without failure. Not less than 2
35、5% of the lubricants weight shall be retained in the bearing at the end of the test. 3.5.5.2 Dust: Bearings subjected to the dust test procedure specified in 4.5.14 shall meet the following requirements: a. Starting torque increase no more than 100% or 2 inch-ounces over initial measured value, whic
36、hever is greater. b. Radial internal clearance increase no more than 50% or .0002 inches over initial measured value, whichever is greater. SAE AS8952 Revision A - 6 - 3.6 Weight: The approximate weight of the bearings shall be as specified on the applicable AS sheet. 3.7 Plating: Plating, when spec
37、ified, shall be zinc-nickel alloy plated in accordance with AMS 2417, Type 2, or cadmium plating in accordance with AMS-QQ-P-416, Type I, Class 2, to a thickness of .0003 to .0006 inch. Plating shall be on all external steel surfaces, except bore, seals and seal retainers. 3.8 Identification of Prod
38、uct: Bearings shall be permanently and legibly marked with the manufacturers name, part number, and CAGE code. The individual bearing package and container shall be marked with the complete MS part number, and the manufacturers name and part number, and date of lubrication in accordance with MIL-STD
39、-129. 3.9 Workmanship: All details of workmanship shall be high grade to ensure satisfactory service life. Parts shall not contain sharp edges, burrs, loose chips, dirt, or other foreign matter. The mating surfaces of the rod end the inner ring with rollers shall be free of tool marks, galling, and
40、scratches after assembly. 3.10 Magnetic Particle Inspection: Certification of such inspection, in accordance with 4.5.1.2, shall be furnished with Qualification and Quality conformance inspection samples. 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: Unless otherwise specified
41、in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any other commercial laboratory acceptable to the purchaser. T
42、he purchaser reserves the right to perform any of the inspection set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to the prescribed requirements. SAE AS8952 Revision A - 7 - 4.1.1 Responsibility for Compliance: All items shall meet al
43、l requirements of Sections 3 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring t
44、hat all products or suppliers submitted for acceptance comply with all requirements of the contract. Sampling inspection, as a part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements. However, this does not authorize submission of known defective material
45、 either indicated or actual, nor does it commit the Government to accept defective material. 4.2 Classification of Inspections: The examination and testing of the bearings shall be classified as: a. Qualification inspection (4.3). b. Quality Conformance inspection (4.4). 4.3 Qualification Inspection
46、: Qualification inspection shall consist of all tests specified under 4.5 and in accordance with Table 1. 4.3.1 Qualification Test Samples: Unless otherwise specified by the qualifying activity, test samples shall consist of 25 bearings for each AS sheet -6 part number, representative of the product
47、ion bearing. The samples shall be identified with the manufacturers part number and such other information as required by the procuring activity (see 6.2). Successful testing of the bearing samples utilizing MIL-PRF-81322 shall grant approval to MIL-PRF-23827 based on similarity. 4.3.2 Test Reports:
48、 The manufacturers test report shall be prepared in accordance with the qualifying activity authorization letter. The report shall include a dated drawing which shall describe in detail the manufacturers product by specifying all dimensions and tolerances, materials, construction, lubricant, plating
49、, and heat treatment. Any information the manufacturer deems proprietary must be so indicated. 4.3.3 Qualification Failure: For initial qualification, any failures during examinations or tests shall be reported to the qualifying activity before continuing testing. Based on corrective action, authorization to complete the qualification test may be granted by the qualifying activity. The applicants products shall pass all requirements of the specification. Failure of any requirement of this specification shall be cause for refusal to grant qualification. SAE AS8952
