1、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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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.Copyright 2004 SAE InternationalAll rights reserved. No part of this publication may be
3、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 ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724
4、-776-0790Email: custsvcsae.orgSAE WEB ADDRESS: http:/www.sae.orgAEROSPACE STANDARDAS4842Issued 1995-05Reaffirmed 2004-06Fittings and Bosses, Pipe Threaded, Fluid Connection1. SCOPE:1.1 Scope:This SAE Aerospace Standard (AS) establishes the requirements for 37 flared tube or machined cone fluid conne
5、ction fittings (see Section 6) for use in all types of fluid systems.1.2 Classification:Fittings shall be furnished in the types and styles designated by the applicable AN, AS, MS, NAS, or other engineering standard drawings. This specification is the same as MIL-F-5509 as applicable to pipe threade
6、d fittings and bosses except for updated materials and process specifications and industry coordinated general improvements. It is intended to serve as a procurement specification for the fittings described herein and in Section 6.2. REFERENCES:2.1 Applicable Documents:The following publications for
7、m a part of this specification 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 specification and references c
8、ited herein, the text of this specification takes precedence. Nothing in this specification, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking
9、 permitted without license from IHS-,-,-SAE AS4842 - 2 -2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 4112 Aluminum Alloy Bars, Rods, and Wire, Rolled, Drawn, or Cold Finished 4.4Cu - 1.5Mg - 0.60Mn (2024-T6)AMS 4124 Bars, Rods, and Wire, Rolled, D
10、rawn or Cold Finished, 5.62N 2.5Mg 1.6Cu 0.23CrAMS 4134 Aluminum Alloy Die Forgings 4.4Cu - 0.85Si - 0.80Mn - 0.50Mg (2014-T4) Solution Heat TreatedAMS 4141 Forgings, Die, 5.6Zn - 2.6Mg - 7.6Cu - 0.23Cr, Solution and Precipitation Heat TreatedAMS 4610 Bars and Rods, Brass, Free Cutting 61.5Cu 3.1Pb
11、35Zn, Half Hard (H02)AMS 5639 Bars, Wire, Forgings, Tubing and Rings, 19Cr 10Ni Solution Heat TreatedAMS 5645 Bars, Forgings, Tubing and Rings, 18Cr 10Ni 0.40Ti Solution Heat TreatedAMS 5646 Bars, Forgings, Tubing and Rings, 18Cr 11Ni 0.60 (Cr + Ta), Solution Heat TreatedAMS 5648 Bars, Forgings, Tub
12、ing and Rings, 17Cr 12Ni 2.5Mo, Solution Heat TreatedAMS 6370 Steel Bars, Forgings and Rings, 0.95Cr 0.20Mo (0.28-0.30C)AMS 6382 Steel Bars, Forgings and Rings, 0.95Cr 0.20Mo (0.38-0.43C)AS478 Identification Marking MethodsAS1376 Alternate Dimensions, Center Body Section, Shape Fluid Fitting, Design
13、 StandardARP4784 Performance and Evaluation Criteria, Surface Defects, Requirements for2.1.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.P-C-437 Cleaning Compound, High Pressure (Steam) CleanerQQ-A-225/
14、6 Aluminum Alloy Bar, Rod, and Wire; Rolled, Drawn, or Cold Finished, 2024QQ-A-225/9 Aluminum Alloy Bar, Rod, Wire, and Special Shaped; Rolled, Drawn, or Cold Finished, 7075QQ-A-367 Aluminum Alloy ForgingsQQ-B-728 Bronze Manganese: Rod, Shapes, Forgings, and Flat Products (Flat Wire, Strip, Sheet, B
15、ar and Plate)QQ-P-35 Passivation Treatments for Corrosion-Resisting SteelQQ-P-416 Plating, Cadmium (Electro-deposited)QQ-S-763 Steel Bars, Wire, Shapes and Forgings, Corrosion-ResistingMIL-S-5626 Steel: Chrome Molybdenum (4140) Bars, Rods and Forging Stock (For Aircraft Applications)MIL-H-6083 Hydra
16、ulic Fluid, Petroleum Base, For Preservation and OperationMIL-H-6088 Heat Treatment of Aluminum AlloysMIL-S-6758 Steel, Chrome-Molybdenum (4130) Bars and Reforging Stock (Aircraft Quality)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking pe
17、rmitted without license from IHS-,-,-SAE AS4842 - 3 -2.1.2 (Continued):MIL-H-6875 Heat Treatment of Steels (Aerospace Practice, Process For)MIL-P-7105 Pipe Threads, Taper, Aeronautical National Form, Symbol Anpt, General Requirements ForMIL-A-8625 Anodic Coatings, for Aluminum and Aluminum AlloysMIL
18、-H-46170 Hydraulic Fluid, Rust Inhibited, Fire Resistant Synthetic Hydrocarbon BaseANA Bulletin No. 431 Air Force-Navy Aeronautical Bulletin Fittings, Flared, Classification of Defects ofFED-STD-595 Colors Used in Government ProcurementMIL-STD-105 Sampling Procedures and Tables for Inspection by Att
19、ributesMS33677 Fitting End, Taper Pipe Thread, Standard Dimensions forAND10053 Bosses: Pipe - Thread, Internal - Standard Dimensions for2.1.3 ANSI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ANSI/ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay)2.1
20、.4 ASTM Publications: Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM A 108 Steel Bars, Carbon, Cold-finished, Standard QualityASTM A 370 Steel Products, Mechanical Testing ofASTM B 16 Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw MachinesASTM B 12
21、4 Copper and Copper-Alloy Forging Rod, Bar and ShapesASTM B 154 Copper and Copper Alloys, Mercurous Nitrate Test for3. TECHNICAL REQUIREMENTS:3.1 Material:Fittings shall be fabricated of materials listed in Table 1 or as specified on the applicable part standard drawing.Copyright SAE International P
22、rovided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS4842 - 4 -TABLE 1 - MaterialsCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-
23、,-,-SAE AS4842 - 5 -3.1.2 Heat Treatment:3.1.2.1 Aluminum Alloy: Aluminum alloy fittings and nuts shall be supplied in the final temper as shown in Table 1. When fitting material is purchased in other than the final temper, the process control shall be in accordance with MIL-H-6088.3.1.2.2 Steel: Wh
24、en additional processing is required to comply with hardness requirements of 3.1.4, heat treatment shall be in accordance with MIL-H-6875.3.1.3 Internal Strain of Copper-base Alloys: Fittings fabricated from copper-base alloys shall have no internal strain as revealed by the test specified in 4.4.2.
25、 After testing, the parts shall be examined; any evidence of cracks indicates internal strain and is not acceptable.3.1.4 Additional Physical Properties: Unless otherwise specified on the applicable drawings, the hardness of the finished carbon steel parts with plating removed shall be 92 HRB to 31
26、HRC. For carbon steel fittings below a hardness of 20 HRC, hardness tests shall be made using the B scale, in which case the hardness shall be within the range of 92 to 99 HRB.3.2 Design and Fabrication:The design and fabrication of the fittings shall be in accordance with the applicable drawings. T
27、he fitting and tube ends shall be in accordance with AS1708, AS4395, AS4396, MS24385, MS24386, MS33583, MS33584, MS33656, or MS33657 as applicable. Dimensional requirements are applicable after heat treatment and protective finishing. The center body section of shape fittings machined from bar or ov
28、ersized forgings shall conform to AS1376.3.2.1 Shape and Form Restrictions: Abrupt reductions of section shall be avoided. Small external sections adjoining relatively heavy body sections shall transition into the heavier sections by means of ample fillets.3.2.2 Passages:3.2.2.1 Drill Offset: On str
29、aight fittings where the fluid passage is drilled from each end, the offset between the drilled holes at the meeting point of the drills shall not exceed .015 in. It shall be possible to pass through the fluid passage a ball whose diameter is .020 less than the minimum diameter specified for the pas
30、sage. This does not mean that the drilled passage may be smaller than that required by the detail drawings.3.2.2.2 Cross Section at Fluid Path Junction: On shape fittings, the cross-sectional area at the junction of fluid passages shall be such that it shall be possible to pass through the fitting f
31、rom end to end, a ball whose diameter is not less than .7 times the minimum diameter specified for the smaller passage.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS4842 - 6 -3.2.3 Threads: P
32、ipe threads shall conform to MIL-P-7105 unless otherwise specified. Steel, corrosion-resistant steel, and aluminum alloy threads may be cut, ground, or rolled (see 3.2.3.1). Copper alloy threads shall be cut or ground only.3.2.3.1 Rolled External Threads: Laps and seams, whose depths are within the
33、limits of Table 2, are acceptable on the crest, and the nonpressure thread flank above the pitch diameter. Laps and seams are not acceptable on any part of the pressure thread flank, in the thread root, or on the nonpressure thread flank extending from above to below the pitch diameter (see Figure 1
34、). Stress cracks are unacceptable.TABLE 2 - Depth of Laps, Seams, Surface Irregularities, and Discontinuities in Rolled ThreadsFIGURE 1 - Laps and Surface Irregularities in Threads3.3 Finish:3.3.1 Aluminum Alloy Fittings: Aluminum alloy fittings, sleeves, and nuts shall be anodized in accordance wit
35、h MIL-A-8625, Type II, Class 2, dyed blue or brown as applicable (see 3.4.4) and shall be duplex sealed.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS4842 - 7 -3.3.2 Carbon Steel Fittings: Ca
36、rbon steel fittings, sleeves, and nuts shall be cadmium plated in accordance with QQ-P-416, Type II, Class 2, dyed black (see 3.4.4). All such carbon steel fittings, sleeves, and nuts shall be dipped in oil conforming to MIL-H-6083 or MIL-H-46170. Fluid passage holes, other openings, and internal th
37、reads shall not be subject to a plating thickness requirement and may exhibit bare areas provided that they are protected with a light film of oil.3.3.3 Corrosion-Resistant Steel Fittings: Corrosion-resistant steel fittings, nuts, and sleeves shall be passivated per QQ-P-35, Type VI or VII.3.3.4 Cop
38、per-base Alloy Fittings: Plating of copper-base alloy fittings in accordance with QQ-P-416, Type II, Class 3 is optional.3.4 Identification of Product:All fittings, nuts, and sleeves shall be marked in accordance with the following instructions. The marking shall be applied per AS478 as specified on
39、 the applicable drawing in a location not detrimental to the performance of the fitting and not detrimental to the corrosion protection of the fitting. When items cannot be physically marked because of lack of space or because marking would have a deleterious effect, the package shall provide the id
40、entification per 5.4.3.4.1 Manufacturers Identification: Unless otherwise specified, all fittings and nuts shall be marked with the manufacturers name, CAGE code or trademark and with the letters AN, MS, AS, or NAS as applicable.3.4.2 Material Identification: Fittings, nuts, and sleeves shall be mar
41、ked with the material code letter as shown in Table 1.3.4.3 Marking for Part Number and Size: A numerical equivalent to the nominal tube size is optional. All fittings larger than .375 in nominal pipe size shall be marked with the part number, exclusive of size. Fittings previously manufactured to A
42、N, AS, MS, or NAS standards that meet all other requirements of this document and the applicable part standards may retain their identification in addition to the previous requirements.3.4.4 Color Identification: In addition to the markings specified, the fittings, nuts, and sleeves shall be identif
43、ied by the following colors:a. Aluminum alloys 2014 and 2024: Blue (see 3.3.1)b. Aluminum alloy 7075: Brown (see 3.3.1)c. Steel: Black (see 3.3.2)d. Copper-base alloys: Natural cadmium plate, if applicable (see 3.3.4)e. Corrosion-resistant steel: NoneCopyright SAE International Provided by IHS under
44、 license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AS4842 - 8 -3.5 Workmanship:Machined surfaces of fittings, sleeves, and nuts shall be as specified on the applicable drawings. Unmachined surfaces, such as forged surfaces and bar stock flats, sha
45、ll be free from blisters, fins, folds, seams, laps, cracks, segregations, spongy areas, or other defects as specified in ARP4784. Surface defects may be explored by suitable etching and if they can be removed so that they do not appear on re-etching and the required section thickness can be maintain
46、ed, they shall not be cause for rejection. The surface texture of unmachined surfaces, except forging parting lines, shall be 250 in Ra per ANSI/ASME B46.1. The surface texture of forging parting planes shall be 500 in Ra per ANSI/ASME B46.1.4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Ins
47、pection:Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection and test requirements as specified herein. Except as otherwise specified, the supplier may utilize their own facilities or any commercial laboratory acceptable to t
48、he purchaser for the performance of the inspection and test requirement. The purchaser reserves the right to perform any of the inspections and tests set forth in this document whenever such inspections and tests are deemed necessary to assure that supplies and services conform to prescribed require
49、ments.4.2 Inspection Lot:A lot shall consist of all the fittings of a given part number, made from the same batch of material and processed at the same time.4.2.1 Material Certification: Records of the chemical composition analysis and mechanical property tests showing conformance to the material requirements of this document shall be available to the procuring activity upon request for each lot of fittings except tha
