1、_ 6$(7HFKQLFDO6WDQGDUGV%RDUG5XOHVSURYLGHWKDW7KLVUHSRUWLVSX EOLVKHGE6$(WRDGYDQFHWKHVWDWHRIWHFKQLFDO 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, LVWKHVROHUHVSR
2、QVLELOLWRIWKHXVHU 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. Copyright 2017 SAE International All rights reserved. No part of this publication may be reproduced,
3、 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: +1 724-776-4970 (outside USA) Fax: 724-776-
4、0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS4841B AEROSPACE STANDARD AS4841 REV. B Issued 1995-05 Revised 2017-01 Superseding AS4841A Fittings, 37 Internal Flare, Flu
5、id Connection, Procurement Specification RATIONALE Administrative revision to correct paragraph cross-references throughout the document and applicable document references. 1. SCOPE 1.1 Purpose This SAE Aerospace Standard (AS) establishes the requirements for 37 flared tube fittings or machined inte
6、rnal cone fluid connection fittings for use with 37 external cone, spherical nose and seal ring fittings in all types of aerospace fluid systems (see Section 6). 1.2 Classification Tube fittings shall be furnished in types, styles and sizes designated by the applicable AS, AN, and MS standards. This
7、 specification is a similar and an improvement to MIL-F-5509 for 37 flared tube fittings. It is intended to serve as the procurement specification for the fittings described herein. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified
8、 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. No
9、thing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside
10、 USA), www.sae.org. AMS2472 Anodic Treatment of Aluminum Alloys Sulfuric Acid Process, Dyed Coatings AMS2486 Conversion Coating of Titanium Alloys Fluoride-Phosphate Type SAE INTERNATIONAL $6% Page 2 of 19 AMS2488 Anodic Treatment - Titanium and Titanium Alloys Solution pH 13 or Higher AMS2658 Hardn
11、ess and Conductivity Inspection of Wrought Aluminum Alloy Parts AMS2700 Passivation of Corrosion Resistant Steels AMS2759 Heat Treatment of Steel Parts General Requirements AMS2770 Heat Treatment of Wrought Aluminum Alloy Parts AMS2771 Heat Treatment of Aluminum Alloy Castings AMS2772 Heat Treatment
12、 of Aluminum Alloy Raw Materials AMS4124 Aluminum Alloy, Rolled or Cold Finished Bars, Rods, and Wire 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T7351) Solution Heat Treated, Stress Relieved by Stretching, and Overaged AMS4133 Aluminum Alloy Forgings and Rolled Rings 4.4Cu - 0.85Si - 0.80Mn - 0.50Mg (2014
13、-T6) Solution and Precipitation Heat Treated AMS4141 Aluminum Alloy Die Forgings 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T73) Solution and Precipitation Heat Treated AMS4339 Aluminum Alloy, Rolled or Cold Finished Bars and Rods 4.4Cu - 1.5Mg - 0.60Mn (2024-T851) Solution Heat Treated, Cold Worked, and
14、Artificially Aged AMS4610 Brass, Free-Cutting Bars and Rods 61.5Cu - 35Zn - 3.1Pb Half Hard (H02) AMS4928 Titanium Alloy Bars, Wire, Forgings, Rings, and Drawn Shapes 6Al - 4V Annealed AMS5639 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Tubing, and Rings 19Cr - 10Ni Solution Heat Treated AMS56
15、45 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing, and Rings 18Cr - 10Ni - 0.40Ti (321) Solution Heat Treated AMS5646 Steel Corrosion and Heat-Resistant Bars, Wire, Forgings, Tubing and Rings 18Cr-11Ni 0.060Cb(Nb) (347) Solution Heat Treated AMS5648 Steel, Corrosion and Heat-Resis
16、tant, Bars, Wire, Forgings, Tubing, and Rings 17Cr - 12Ni - 2.5Mo (316) Solution Heat Treated AMS5666 Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, Extrusions, and Rings 62Ni - 21.5Cr - 9.0Mo - 3.65Cb (Nb) Annealed AMS6370 Steel, Bars, Forgings, and Rings 0.95Cr - 0.20Mo (0.28 - 0.33C)
17、 (SAE 4130) AMS6382 Steel, Bars, Forgings, and Rings 0.95Cr - 0.20Mo (0.38 - 0.43C) (SAE 4140) Annealed AMS-QQ-A-225/6 Aluminum Alloy, 2024, Bar, Rod, and Wire; Rolled, Drawn, or Cold Finished AMS-QQ-A-225/9 Aluminum Alloy 7075, Bar, Rod, Wire, and Special Shapes; Rolled, Drawn, or Cold Finished AMS
18、-QQ-P-416 Plating, Cadmium (Electrodeposited) AMS-S-6758 Steel, Chrome-Molybdenum (4130) Bars and Reforging Stock (Aircraft Quality) SAE INTERNATIONAL $6% Page 3 of 19 AMS-H-6875 Heat Treatment of Steel Raw Materials AS478 Identification Marking Methods AS1376 Alternate Dimensions, Center Body Secti
19、on, Shape Fluid Fitting, Design Standard AS1708 Fitting End, Internal Flare, Design Standard AS4330 Tubing, Flared, Standard Dimensions for, Design Standard AS4395 Fitting End, Flared, Tube Connection, Design Standard AS4396 Fitting End, Bulkhead, Flared, Tube Connection, Design Standard ARP4784 Def
20、initions and Limits, Metal Material Defects and Surface and Edge Features, Fluid Couplings, Fittings and Hose Ends AS5176 Fitting, Sleeve, Flared AS5202 Port or Fitting End, Internal Straight Thread, Design Standard AS5203 Tube End, Double Flare, Design Standard AS5309 Fitting End, Spherical, 37 Fla
21、red Tube Connection Design Standard AS5310 Fitting End, Bulkhead, Spherical, 37 Flared Tube Connection Design Standard AS8879 Screw Threads - UNJ Profile, Inch Controlled Radius Root with Increased Minor Diameter ARP9013 Statistical Product Acceptance Requirements AS33583 Tubing End Double Flare, St
22、andard Dimensions for AS71051 Pipe Threads, Taper, Aeronautical National Form, Symbol ANPT - Design and Inspection Standard 2.1.2 U.S. Government Publications Copies of these documents are available online at http:/quicksearch.dla.mil. MIL-PRF-6083 Hydraulic Fluid, Petroleum Base, for Preservation a
23、nd Operation MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric MIL-DTL-83488 Coating, Aluminum, High Purity MIL-A-8625 Anodic Coatings, for Aluminum and Aluminum Alloys FED-STD-595 Colors Used in Government Procurement A-A-59133 Cleaning Compound, High Press
24、ure (Steam) Cleaner MS21344 Fitting - Installation of Flared Tube, Straight Threaded Connectors, Design Standard for SAE INTERNATIONAL $6% Page 4 of 19 2.1.3 ASME Publications Available from ASME, P.O. Box 2900, 22 Law Drive, Fairfield, NJ 07007-2900, Tel: 800-843-2763 (U.S./Canada), 001-800-843-276
25、3 (Mexico), 973-882-1170 (outside North America), www.asme.org. ASME B46.1 Surface Texture (Surface Roughness, Waviness and Lay) 2.1.4 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM A1
26、08 Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products ASTM B16/B16M Specification for Free-Cutting Brass Rod, Bar and Shapes for use in Screw Machines ASTM B154 Standard Test Method for Mercur
27、ous Nitrate Test for Copper Alloys ASTM B858 Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys 2.1.5 PRI Publications Available from Performance Review Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616,
28、 www.pri-network.org. AC7112 NADCAP Audit Criteria for Fluid Systems Component Manufacturers AC7112/2 NADCAP Audit Criteria for Fittings and other Machined Components 2.1.6 ISO Publications Available at http:/webstore.ansi.org. ISO 6957 Copper alloys-Ammonia test for stress corrosion resistance 3. T
29、ECHNICAL REQUIREMENTS 3.1 Accreditation 3.1.1 Manufacturer Accreditation A manufacturer producing a product in conformance to this procurement specification shall be accredited in accordance with the requirements of AC7112 and shall be listed in the 1$ or brown for material code W as applicable (see
30、 3.7.4) and shall be duplex sealed. Contact area from anodizing electrode may show discoloration and impressions. Such discoloration and impression due to anodizing electrode shall not be cause for rejection if they occur in internal passages. Burn marks are not permissible. Bare areas occurring on
31、37 cone or spherical sealing surfaces, bearing or threaded surfaces shall be cause for rejection. Bare areas shall not exceed 30% of the remaining surface area. 3.4.1.2 High Purity Aluminum Coating When specified, high purity aluminum coating shall be per MIL-DTL-83488, Class 3, Type II, with 0.0005
32、 inch maximum thickness. Chromate treatment shall be applied after glass bead peening at a pressure of 25 psig maximum. Barrel processing is not permitted. Surface texture after glass bead peening and chromate treatment shall not exceed drawing tolerances. Coating thickness requirements for holes, r
33、ecesses, and internal threads do not apply. Visual evidence of coating in holes and openings shall be to a minimum depth of two diameters or two times opening. 3.4.2 Low Alloy Steel Fittings Low alloy steel fittings, sleeves, and nuts shall be cadmium plated in accordance with AMS-QQ-P-416, Type II,
34、 Class 2, dyed black (see 3.7.4). All such low alloy steel fittings, sleeves, and nuts shall be dipped in oil conforming to MIL-PRF-6083 or MIL-PRF-83282. Fluid passage holes, other openings, and internal threads shall not be subject to a plating thickness requirement and may exhibit bare areas prov
35、ided that they are protected with a light film of oil. 3.4.3 Corrosion-Resistant Steel Fittings Corrosion-resistant steel fittings, nuts, and sleeves shall be passivated per AMS2700, Type 6 or 7. 3.4.4 Copper-Base Alloy Fittings Plating of copper-base alloy fittings in accordance with AMS-QQ-P-416,
36、Type II, Class 3 when specified. SAE INTERNATIONAL $6% Page 7 of 19 3.4.5 Titanium Alloy Fittings Titanium alloy fittings and nuts shall be anodized per AMS2488 Type 2 or shall be fluoride phosphate coated per AMS2486, except that a pretreatment, a modification of the fluoride treatment, or a post t
37、reatment shall be applied so that the final color of the fittings shall be similar to colors 36076 through 36293 per FED-STD-595. Bare areas occurring on sealing, bearing, or threaded surfaces shall be cause for rejection. Bare areas shall not exceed 30% of the remaining surface area (see 3.8). 3.5
38、Design and Fabrication The design and fabrication of the fittings ends shall be in accordance with the applicable standard part drawings. The fitting and tube ends shall be in accordance with AS1708, AS4330, AS4395, AS4396, AS5202, AS5203, AS5309, AS5310, AS33583 or other design standards as applica
39、ble. Dimensional requirements are applicable after heat treatment and protective finishing. The center body section of shape fittings machined from bar or oversized forgings shall conform to AS1376. The following tube ends are called out as reference: AS4330, AS5203, and AS33583. 3.5.1 Shape and For
40、m Restrictions Abrupt reductions of section shall be avoided. Small external sections adjoining relatively heavy body sections shall be transitioned into the heavier sections by means of ample fillet radii. 3.5.2 Passages 3.5.2.1 Machining Offset On straight fittings where the fluid passage is drill
41、ed from each end, the offset between the drilled holes at the meeting point of the drills shall not exceed 0.015 inch. It shall be possible to pass through the fluid passage a ball whose diameter is 0.020 inch less than the minimum diameter specified for the passage. Passages must meet the minimum d
42、iameter requirement by the detail part standard drawings. 3.5.2.2 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 from end to end, a ball whose diameter is not less
43、than 0.7 times the minimum diameter specified for the smaller passage. 3.5.3 Threads Pipe threads shall conform to AS71051. Straight threads shall be of unified form and shall conform to AS8879, except as specified herein. Threads may be cut, or ground, or rolled. 3.5.4 Rolled External Threads Laps
44、and seams, whose depths are within the limits of Table 2, are acceptable on the crest and the non-pressure 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 non-pressure thread flank in the area between th
45、e 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 Size Code Depth, Inch, Max 02 0.006 03 0.006 04 0.007 05 0.007 06 0.008 08 0.009 10 through 48 0.010 SAE INTERNATIONAL $6%
46、Page 8 of 19 Figure 1 - Laps and surface irregularities in threads 3.5.5 Assembly Unless otherwise specified, assemble using methods and torque values in accordance with MS21344. 3.6 Performance 3.6.1 Internal Strain of Copper-Base Alloys Fittings fabricated from copper-base alloys shall have no int
47、ernal strain as revealed by the test specified in 4.7.4. After testing, the parts shall be examined. Any evidence of cracks indicates internal strain and is not acceptable. 3.6.2 Expansion Test of Low Alloy Steel Sleeves Sleeves per AS5176 or equivalent fabricated from low alloy steel shall meet the
48、 load values shown in Table 3 when subjected to the expansion test of 4.7.5. Table 3 - Expansion test load values for standard AS5176 or equivalent low alloy steel sleeves Size Code Load lb 10 lb Size Code Load lb 10 lb 02 1700 16 8400 03 2200 20 11700 04 1950 24 15350 05 1950 28 16950 06 2050 32 18700 08 4200 40 20450 10 4100 48 22200 12 7400 3.6.3 Operating Pressures Fittings covered by this document when assembled per MS21344 are intended for use with all types
