SAE AS 4393C-2015 Nut Self-Locking UNS S66286 1200 160 000 psi UNJ Thread.pdf

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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref

2、rom, is the sole responsibility of the user.”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 2015 SAE InternationalAll rights reserved. No part of this publi

3、cation 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 ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (out

4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AS4393CAEROSPACESTANDARDAS4393REV. CIssued 1991-08Reaffirmed 2006-10Revised 2015-08Supersedin

5、g AS4393BNut, Self-Locking, UNS S66286, 1200 F, 160,000 psi, UNJ ThreadFSC 5310RATIONALEPara 3.9.1 - sensitivity level 2 minimum added. Para 3.10.7 - deletion of note regarding after testing assembly. Table 5 -0.375 assembly torque corrected. Table 10 - 10,001 to 35,000 lot size corrected. Specifica

6、tions updated and document updated where required.1. SCOPE1.1 TypeThis specification establishes the requirements for the following types of self-locking nuts:a. Wrenching Nuts: i.e., hexagon and double hexagon nuts.b. Anchor Nuts: i.e., plate nuts, gang channel nuts, and shank nuts.The wrenching nu

7、ts, shank nuts, and nut elements of plate and gang channel nuts are made of corrosion and heat resistant precipitation hardenable iron base alloy of the type identified under the Unified Numbering System as UNS S66286 and of 160,000 psi axial tensile strength at room temperature, with maximum condit

8、ioning temperature of parts at 1200 F prior to room temperature testing.1.2 ApplicationPrimarily for use in aerospace propulsion systems up to approximately 1200 F for tension height nuts made from bar, forging, or sheet. Nuts are designed for use with bolts capable of developing 160,000 psi tensile

9、 strength at room temperature and having UNJ profile threads.2. REFERENCES2.1 Applicable DocumentsThe 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

10、 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.S

11、AE INTERNATIONAL AS4393C Page 2 of 342.1.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2411 Plating, Silver for High Temperature ApplicationsAMS2759/3

12、Heat Treatment Precipitation-Hardening Corrosion-Resistant and Maraging Steel PartsAMS5525 Steel, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B -0.30V 1800 F (982 C) Solution Heat TreatedAMS5731 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings,

13、 Tubing, and Rings 15Cr - 25.5Ni - 1.2Mo -2.1Ti - 0.006B - 0.30V Consumable Electrode Melted, 1800 F (982 C) Solution Heat TreatedAMS5732 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings 15Cr - 25.5Ni - 1.2Mo -2.1Ti - 0.006B - 0.30V Consumable Electrode Melted 1800 F (982

14、 C) Solution and Precipitation Heat TreatedAMS5734 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, and Tubing 15Cr - 25.5Ni - 1.2Mo - 2.1Ti -0.006B - 0.30V Consumable Electrode Melted, 1650 F (899 C) Solution Heat TreatedAMS5737 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, a

15、nd Tubing 15Cr - 25.5Ni - 1.2Mo - 2.1Ti -0.006B - 0.30V Consumable Electrode Melted 1650 F (899 C) Solution and Precipitation Heat TreatedAMS5853 Steel, Corrosion and Heat-Resistant, Bars and Wire 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted 1800 F (982 C) Solution Trea

16、ted and Work-Strengthened 160 ksi (1103 MPa) Tensile StrengthAS870 Wrenching Configuration, Bi-Hexagonal (12 Point) Drive, Design Standard ForAS1310 Faster Torque for Threaded Applications, Definitions OfAIR1471 Torque Tightening Threaded FastenersAS5447 Acceptance Criteria for Nuts - Magnetic Parti

17、cle, Fluorescent Penetrant, and Visible Penetrant ExaminationAS7477 Bolts and Screws, Steel, UNS S66286, Tensile Strength 130 ksi, Procurement SpecificationAS7478 Bolts and Screws, Steel, UNS S66286, Classification: 130 ksi/1200 F, 1800 F Solution Heat Treated, Aged After Roll Threaded, Procurement

18、Specification forAS7481 Studs, Steel, UNS S66286, Aged After Roll Threaded, Procurement Specification ForAS7482 Studs, Corrosion and Heat Resistant Steel, UNS S66286, Tensile Strength 130 ksi, 1800 F Solution Heat Treated, Aged Before Roll Threading, Procurement SpecificationAS8879 Screw Threads - U

19、NJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter2.1.2 U.S. Government PublicationsCopies of these documents are available online at http:/quicksearch.dla.mil.MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic BaseSAE INTERNATIONAL AS4393C Page 3 of 342.1.3 ASTM Pu

20、blicationsAvailable from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM E112 Determining Average Grain SizeASTM E140 Standard Hardness Conversion Tables for MetalsASTM E1417 Liquid Penetrant ExaminationASTM D3951 Comm

21、ercial Packaging2.1.4 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

22、.36M Surface Texture Symbols2.1.5 NAS Publications:Available from Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org.NAS3353 Fixture - Bearing Surface Squareness Test Self-Locking NutsNASM 1312-6 Fastener Test Metho

23、ds, Method 6, HardnessNASM 1312-7 Fastener Test Methods, Method 7, VibrationNASM 1312-8 Fastener Test Methods, Method 8, Tensile Strength2.2 DefinitionsRefer to AS1310 for definitions related to fastener torque.BURR: A rough edge or ridge left on the metal due to a cutting, grinding, piercing or bla

24、nking operation.DEFECT: Any nonconformance of the unit of product with specified requirements.DEFECTIVE: A unit of product which contains one or more defects.INSPECTION LOT: Shall consist of nuts from a single production lot, of the same part number.PRODUCTION INSPECTION LOT: Shall be all furnished

25、parts of the same part number, made from a single heat of alloy, heat treated at the same time to the same specified condition, produced as one continuous run, and submitted for vendors inspection at the same time.ROOM TEMPERATURE: Ambient temperature (68 F approximately).TIGHT BURR: A burr closely

26、compacted and binding in the periphery of a part without any loose ends and is within the dimensional limits of the part.SAE INTERNATIONAL AS4393C Page 4 of 342.3 Unit Symbols degree, angularC degree CelsiusF degree Fahrenheit% percent (1% = 1/100)HRC hardness, Rockwell C scalelbf pound-forcelbf-in

27、pound-force inch, torquepsi pound-force per square inchcpm cycles per minutein2 square inchin Ra microinch, roughness average3. TECHNICAL REQUIREMENTS3.1 MaterialShall be a corrosion and heat resistant steel, AMS5731 or AMS5734, bars or forgings, as specified on the part drawing for wrenching nuts,

28、shank nuts, and nut elements of plate and gang channel nuts. When specified on the part drawing, wrenching nuts and nut elements of plate or gang channel nuts may be formed from AMS5525 sheet. Material for the retaining plate for plate nuts and channel for gang channel nuts shall be capable of meeti

29、ng the requirements of this specification, and shall be as specified on the part drawing.3.2 DesignFinished (completely manufactured) parts shall conform to the following requirements:3.2.1 DimensionsThe dimensions of finished parts, after all processing, including plating, shall conform to the part

30、 drawing. Dimensions apply after plating but before coating with dry film lubricants.3.2.1.1 Bearing Surface PerpendicularityShall be as specified on the part drawing when tested in accordance with Appendix A.3.2.1.2 Geometric TolerancesPart features shall be within the geometric tolerance specified

31、 on the part drawing when tested by conventional measuring methods, except for bearing surface perpendicularity as in 3.2.1.1.3.2.2 Surface TextureSurface texture of finished parts, prior to plating, shall conform to the requirements as specified on the part drawing, determined in accordance with AS

32、ME B46.1. Surface texture symbols per ASME Y14.36M.SAE INTERNATIONAL AS4393C Page 5 of 343.2.3 ThreadsScrew thread UNJ profile in accordance with AS8879.3.2.3.1 CountersinkThe entering end of the thread at the bearing surface and the end of the thread at the top of nut shall be countersunk as specif

33、ied on the part drawing.3.2.3.2 Plated ThreadsThread in plated nuts shall meet the material limits for coated or plated threads specified in AS8879.3.2.3.3 After Forming Self-Locking FeatureThe upper threaded portion shall be formed out of round in any manner which provides self-locking nuts meeting

34、 the locking torque requirements of this specification. The plated nut shall allow the GO thread plug gage to enter a minimum of three turns before engagement of the locking element for tension nuts having overall length of threaded portion not less than 1.2 times the nominal thread diameter; nuts h

35、aving shorter threaded portion shall allow GO thread plug gage to enter a minimum of three quarters of a turn.3.2.4 ConstructionThe nut shall be of the prevailing torque-type, self-contained, all metal unit, including the self-locking feature. The locking feature shall not operate by means of separa

36、te movement and shall not depend upon pressure on the bearing surface for the locking action. Tool marks resulting from producing the self-locking feature shall blend smoothly without abrupt change.3.3 Heat TreatmentThe nuts shall be solution and precipitation heat treated in accordance with AMS2759

37、/3 requirements for UNS S66286.3.4 Product MarkingEach part shall be identification marked as specified on the part drawing. Depressed characters shall have a rounded root form, depressed 0.010 inch maximum.3.5 PlatingUnless otherwise specified on the part drawing, parts shall be silver plated in ac

38、cordance with AMS2411. On nuts with nominal thread diameter 0.250 inch and larger, the plating on the thread flanks shall be not less than 0.0002 inch thick when measured on the pitch diameter. Microscopic measurement of a sectioned nut shall be used as the referee method. Nuts with nominal thread d

39、iameter below 0.250 inch shall show complete coverage on the thread surfaces. Plating on the other surfaces shall be 0.0003 to 0.0006 inch thick, unless otherwise specified on the part drawing. No plating shall be applied to the retaining plate for floating plate nuts and channel for gang channel nu

40、ts, unless otherwise specified on the part drawing.3.6 LubricationThe nuts may be provided with a wax type coating (such as cetyl alcohol) which will prevent nut-bolt seizure at initial installation provided such treatment is applicable to all production nuts of the same part number.SAE INTERNATIONA

41、L AS4393C Page 6 of 343.7 Mechanical Properties3.7.1 HardnessUnless otherwise specified on the part drawing, the core hardness after heat treatment as in 3.3 shall be no greater than 39 HRC (see 8.1), determined in accordance with NASM 1312-6. The minimum limit is controlled by the axial tensile str

42、ength requirement in 3.10.1.3.8 Metallurgical Properties3.8.1 MicrostructureWrenching nuts and nut elements of anchor nuts shall have microstructure of completely recrystallized material, except for cold working effects of tapping and forming operation of locking feature.3.8.2 Grain SizeShall be an

43、average of ASTM 5 or finer with grains as large as 2 in the base of the nut as determined by comparison of a polished and etched specimen with ASTM E112 plate 2. In case of disagreement on grain size by the comparison method, the intercept (Heyn) procedure shall be used.3.9 QualityParts shall be uni

44、form in quality and condition, free from loose burrs (tight burrs may be acceptable if part performance is not affected), foreign materials, and from imperfections detrimental to the usage of the part.3.9.1 Fluorescent Penetrant InspectionParts shall be subject to fluorescent penetrant inspection, p

45、rior to plating or with plating removed, in accordance with ASTM E1417, Type 1, Sensitivity Level 2 minimum. Acceptance criteria of surface discontinuities shall be in accordance with AS5447.3.10 Product Performance TestRefer to Tables 7 and 8 for details of sample sizes for Acceptance Test Plan and

46、 Qualification Approval Test Plan.3.10.1 Axial Tensile StrengthNuts shall withstand the minimum tensile load as specified in Table 1 without rupture, stripping, or appearance of cracks when tested as follows:3.10.1.1 As Received Condition at Room TemperatureNuts in as received condition tested in ac

47、cordance with NASM 1312-8, using alloy steel test bolts hardened and tempered to 40 HRC minimum and having threads in accordance with 3.2.3, shall withstand the axial tensile load specified in Table 1, applied at room temperature at the rate specified in Note /2/.3.10.1.2 After Bake, at Room Tempera

48、turePrior to testing, the nut shall be assembled on a bolt as specified in 3.11 with at least two thread turns protruding through the nut and baked for 6 hours 0.25 hour at 1200 F 15 F, and then cooled to room temperature. A new test bolt shall be used for each axial tensile test. Nuts shall be test

49、ed, after baking, at room temperature in accordance with NASM 1312-8 and shall withstand the axial tensile load in Table 1, applied at the rate specified in Note /2/.SAE INTERNATIONAL AS4393C Page 7 of 34Table 1 - Axial tensile loadNutThreadSizeAxial Tensile Loadat Room Temp.lbf minimum /1/0.1380-32 UNJC-3B 1,1900.1380-40 UNJF-3B 1,4000.1640-32 UNJC-3B 1,9140.1640-36 UNJF-3B 2,0560.1900-32 UNJF-3B 2,