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1、AEROSPACE STANDARD AS4444 Issued1996-05 Reaffirmed2007-08 Fittings, 24 Cone Flareless, Fluid Connection, 5000 psi 1.SCOPE: 1.1Scope: This SAE Aerospace Standard (AS) establishes the requirements for 24 cone flareless fluid connection fittings and nuts and bite type flareless sleeves (see Section 6)
2、for use in aircraft fluid systems at an operating pressure of 5000 psi for the fittings and nuts and 3000 psi for the bite type sleeves. 1.2Classification: Fittings shall be furnished in the types and styles designated by the applicable AS, MS, NAS, or other engineering part standard drawings. This
3、specification includes the same requirements for flareless fittings used with bite type sleeves that appear in MIL-F-18280 except for updated materials and process specifications and industry coordinated general improvements. It also includes requirements for machined acorn fitting ends. It is inten
4、ded to serve as a procurement specification for the fittings described herein, and in Section 6. The requirements for bite type sleeves are given in AS4444/1. 2.REFERENCES: 2.1Applicable Documents: The following publications form a part of this document to the extent specified herein. The latest iss
5、ue 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,
6、 however, supersedes applicable laws and regulations unless a specific exemption has been obtained. RATIONALE This document has been reaffirmed to comply with the SAE 5-Year Review policy. SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of tech
7、nical 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 whi
8、ch time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 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, mechanica
9、l, 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: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org Copyright SAE International P
10、rovided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:56:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 2 - 2.1.1SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS
11、 2486Conversion Coating of Titanium Alloys, Fluoride Phosphate Type AMS 2488Anodic Treatment, Titanium and Titanium Alloys AMS 2759Heat Treatment, Steel Parts, General Requirements AMS 2770Heat Treatment of Wrought Aluminum Alloy Parts AMS 4112Aluminum Alloy Bars, Rods, and Wire, Rolled, Drawn, or C
12、old Finished 4.4Cu - 1.5Mg - 0.60Mn (2024-T6) AMS 4124Bars, Rods, and Wire, Rolled, Drawn or Cold Finished, 5.62N 2.5Mg 1.6Cu 0.23Cr AMS 4134Aluminum Alloy Die Forgings 4.4Cu - 0.85Si - 0.80Mn - 0.50Mg (2014-T4) Solution Heat Treated AMS 4141Forgings, Die, 5.6Zn - 2.6Mg - 7.6Cu - 0.23Cr, Solution an
13、d Precipitation Heat Treated AMS 4928Titanium Alloy Bars and Forgings, 6Al-4V, Annealed, 120,000 PSI (827 MPa) Yield AMS 5639Bars, Wire, Forgings, Tubing and Rings, 19Cr 10Ni Solution Heat Treated AMS 5645Bars, Forging, Tubing and Rings, 18Cr 10Ni 0.40Ti Solution Heat Treated AMS 5648Bars, Forgings,
14、 Tubing and Rings, 17Cr 12Ni 2.5Mo, Solution Heat Treated AMS 5659Bars, Wire, Forgings, Rings and Extrusions, 15Cr 4.5Ni 0.30 (Cb + Ta) 3.5Cu, Consumable Electrode Melted, Solution Heat Treated, Precipitation Hardenable AMS 6370Steel Bars, Forgings and Rings, 0.95Cr 0.20Mo (0.28-0.30C) ARP603Impulse
15、 Testing of Hydraulic Hose Tubing and Fittings Assemblies ARP891Determination of Aluminum Alloy Tempers Through Electrical Conductivity Measurements ARP1185Flexure Testing of Hydraulic Tubing Joints and Fittings AS1241Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft AS1376Alternate Dimens
16、ions, Center Body Section, Shape Fluid Fitting, Design Standard AS4375Fitting End, External Thread, Flareless Design Standard AS4377Fitting End, Bulkhead, Flareless, Design Standard AS4444/1Sleeve, Bite Type, 24 Cone Flareless Fitting AS4458Fitting End, Flareless, Blunt Nose, Design Standard AS4658F
17、itting End, External Thread, Short Flareless, Design Standard AS4659Fitting End, Bulkhead, External Thread, Short Flareless, Design Standard AS4703Fitting End, Acorn, Short Flareless, Design Standard ARP4784Performance and Evaluation Criteria, Surface Defects, Requirements for SAE Dictionary of Aero
18、space Engineering Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:56:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 3 - 2.1.2U.S. Government Publications: Available from
19、DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. QQ-A-225/6Aluminum Alloy Bar, Rod, and Wire; Rolled, Drawn, or Cold Finished, 2024 QQ-A-225/9Aluminum Alloy Bar, Rod, Wire and Special Shapes; Rolled, Drawn, or Cold Finished, 7075 QQ-A-367Aluminum Allo
20、y Forgings QQ-P-35Passivation Treatments for Corrosion Resisting Steel QQ-P-416Plating, Cadmium (Electro-deposited) QQ-S-763Steel Bars, Wire, Shapes and Forgings, Corrosion-Resisting MIL-STD-12Abbreviations for Use on Drawings, and in Specifications, Standards and Technical Documents MIL-STD-1655Fit
21、tings, Flareless, Classification of Defects of MIL-H-5606Hydraulic Fluid, Petroleum Base, Missile Ordnance Reviewer MIL-H-6083Hydraulic Fluid, Petroleum Base, For Preservation and Operation MIL-H-6088Heat Treatment of Aluminum Alloys MIL-S-6758Steel, Chrome-Molybdenum (4130) Bars and Reforging Stock
22、 (Aircraft Quality) MIL-T-6845Tubing, Steel, Corrosion-Resistant (S30400), Aerospace Vehicle Hydraulic System 1/8 Hard Condition MIL-H-6875Heat Treatment of Steels (Aerospace Practice, Process For) MIL-A-8625Anodic Coatings, for Aluminum and Aluminum Alloys MIL-S-8879Screw Threads, Controlled Radius
23、 Root with Increased Minor Diameter: General Specification For MIL-F-18280Fittings, Flareless Tube, Fluid Connection MIL-L-46010Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting MIL-H-46170Hydraulic Fluid, Rust Inhibited, Fire Resistant Synthetic Hydrocarbon Base MIL-H-83282Hydraulic Fluid, Fi
24、re Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric FED-STD-595Colors Used in Government Procurement MS21932Fitting End, Bolt Cluster Fitting, Single Port MS21934Fitting End, Bolt Cluster Fitting, Double Port MS21935Fitting End, Bolt Cluster Fitting, Double Port, Through, Flareless MS33514Fit
25、ting End, Standard Dimensions for Flareless Tube Connection and Gasket Seal MS33515Fitting End, Standard Dimension for Bulkhead Flareless Tube Connection 2.1.3National Aerospace Standards Publications: Available from Aerospace Association of America, 1725 DeSales Street, N.W., Washington, DC 20036.
26、NAS1760Fitting End, Flareless Acorn, Standard Dimensions for Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:56:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 4 - 2.1.4AN
27、SI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002. ANSI/ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay) ANSI/ASQC Z1.4Sampling Procedures and Tables for Inspection by Attributes ANSI Z540-1Calibration Laboratories in Measuring Test Equipment General
28、 Requirements 2.1.5ISO Publications: Available from Internal Organization for Standardization, Case PostAle 56, CH-1211 Genve 20, Switzerland. ISO 10012-1Quality Assurance Requirements for Measuring Equipment 2.1.6ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 1
29、9428-2959. ASTM A 370Steel Products, Mechanical Testing of 2.2Abbreviations and Acronyms: Standard abbreviations used in this document and frequently used in aerospace technical documents may be found in MIL-STD-12. 2.3Definitions: Definitions of terms used in this document and frequently used in ae
30、rospace technical documents may be found in the SAE Dictionary of Aerospace Engineering. 3.TECHNICAL REQUIREMENTS: 3.1Material: Fittings shall be fabricated of materials listed in Table 1 and in compliance with requirements in this specification or as specified on the applicable part standard drawin
31、g. 3.1.1Heat Treatment: 3.1.1.1Aluminum 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 heat treatment of the raw material shall be in accordance with MIL-H-6088. Heat treating o
32、f semi-finished or finished parts shall be in accordance with AMS 2770. 3.1.1.1.1Electrical Conductivity and Hardness: Aluminum alloy fittings and nuts shall meet the electrical conductivity and hardness requirements of ARP891. The material may have to be heat treated before or after fabrication of
33、parts in order to meet the requirement. 3.1.1.2Steel: When additional processing is required to comply with hardness requirements of 3.1.2, the heat treatment shall be in accordance with MIL-H-6875 or AMS 2759. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply
34、 Ctr/5913977001 Not for Resale, 12/04/2007 19:56:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 5 - TABLE 1 - Materials Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 19:56
35、:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 6 - 3.1.2Additional Physical Properties of Steel: 3.1.2.1Carbon Steel: Unless otherwise specified on the applicable drawings, the hardness of the finished carbon steel fittings and nuts with plating removed sh
36、all be 92 HRB to 31 HRC. For carbon steel fittings and nuts 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 (see 4.6.2). 3.1.2.2Class 300 Series Corrosion Resistant Steel: Unless otherwise specified on t
37、he applicable drawings, the hardness of the finished class 300 series corrosion resistant steel parts shall be 80 HRB minimum (see 4.6.2). 3.1.2.3Type 15-5ph Corrosion Resistant Steel: Unless otherwise specified on the applicable drawings, the type 15-5ph corrosion resistant steel material shall be
38、heat treated to condition H-1075, before or after machining. 3.1.3Parting Lines in Aluminum Forgings: Parting lines, which are formed by a pattern division during forming, shall be free of tears and crack-like indications. Surface defects may be explored as specified under 3.6. NOTE: Parting lines o
39、r flash lines of fittings having such defect indications shall be ground flush to blend with the forging body, without reduction of the forging body thickness below drawing minimum. The finish in the ground parting line or flash line area shall not exceed 125 in roughness average (Ra) as defined in
40、ANSI/ASME B46.1 after grinding. Machined and unmachined surfaces shall not exceed the discontinuity criteria of ARP4784, Grade A. Following anodizing, the part shall not exhibit cracks or crack-like defects exceeding ARP4784, Grade A. 3.2Design and Fabrication: The design and fabrication of the fitt
41、ings shall be in accordance with the applicable drawings. The fitting ends shall be in accordance with AS4375, AS4377, AS4458, AS4658, AS4659, AS4703, MS21932, MS21934, MS21935, MS33514, MS33515, or NAS1760 as applicable. Dimensional requirements are applicable after heat treatment and protective fi
42、nishing. The center body section of shape fittings machined from bar or oversized forgings shall conform to AS1376. 3.2.1Shape and Form Restrictions: Abrupt reductions of section shall be avoided. Small external sections adjoining relatively heavy body sections shall transition into the heavier sect
43、ions by means of ample fillets. 3.2.2Passages: 3.2.2.1Machining Offset: For straight fittings where the fluid passage is machined from each end, the offset between the machined holes at the meeting point of the holes shall not exceed .015 in. It shall be possible to pass through the fluid passage a
44、ball whose diameter is .020 less than the minimum diameter specified for the passage. This does not mean that the fluid passage may be smaller than that required by the detail standard part drawings. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/591397
45、7001 Not for Resale, 12/04/2007 19:56:19 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AS4444 - 7 - 3.2.2.2Cross Section at Fluid Path Junction: For shape fittings, the cross-sectional area at the junction of fluid passages shall be such that it shall be possible to p
46、ass through the fitting from end to end, a ball whose diameter is not less than .7 times the minimum diameter specified for the smaller passage. 3.2.3Threads: Threads shall be per MIL-S-8879 except that the root radius is not required on incomplete threads. External threads on steel, corrosion resis
47、tant steel, and titanium alloy may be produced by a single point method, ground, or rolled. External threads on aluminum alloy may be cut, ground, or rolled (see 3.2.3.1). Internal threads may be produced by a single point method, cut, ground, or rolled. 3.2.3.1Rolled External Threads: Laps and seam
48、s, whose depths are within the 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 in the area between the thread root and the pitch diameter (see Figure 1). Stress cracks are unacceptable. TABLE 2 - Depth of Laps, Seams, Surface Irregularities, and Discontinuities in Rolled Threads FIGURE 1 - Laps and Surface Irregularities in Threads Copyright SAE International Provided by IHS under license wi