1、AEROSPACE STANDARDAS5377Issued 2000-04Nut, Self-Locking, 0.7500 thru 1.5000 Thread Sizes, UNS S66286,160,000 psi, 800 F, UNJ Thread - Procurement Specification1. SCOPE:1.1 Type:This specification establishes the requirements for self-locking wrenchable nuts with thread sizes 0.7500 thru 1.5000 inche
2、s.The 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 conditioning temperature of parts at 800 F.1.2 Application:
3、Primarily for use in aerospace propulsion systems up to approximately 800 F for tension height nuts made from bar, or forging. Nuts are designed to withstand an axial load of 160,000 psi at room temperature.2. REFERENCES:2.1 Applicable Documents:The following publications form a part of this documen
4、t 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 document and references cited herein, the text of this docu
5、ment takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.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
6、 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 which time it may be reaffirmed, revised, or
7、cancelled. SAE invites your written comments and suggestions. Copyright 2004 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,
8、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: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Reaffirmed 2004-07SAE AS5377 - 2 -2.1.1 SAE Publications: Available from SAE, 4
9、00 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2411 Silver Plating, High Temperature ApplicationAMS 2759/3 Heat Treatment of Precipitation Hardening Corrosion and Maraging Steel PartsAMS 5663 Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings 52.5Ni 19Cr 3.0Mo 5.1Cb 0.90Ti 0
10、.50Al 18Fe, Consumable Electrode or Vacuum Inducted Melted 1775F (968C) Solution and Precipitation Heat TreatedAMS 5731 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, 1800F (982 C) Solution Heat TreatedA
11、MS 5732 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, 1800F (982 C) Solution and Precipitation Heat TreatedAMS 5734 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, and Tubing 15Cr 25.5Ni 1.2Mo
12、 2.1Ti 0.006B 0.30V, Consumable Electrode Melted, 1650 F (899 C) Solution Heat TreatedAMS 5737 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 and Precipitation Heat TreatedAMS 5853 Steel
13、 Corrosion and Heat Resistant, Bars and Wire, 15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V, 1800 F (982 C), Consumable Electrode Melted Solution Treated and Work-Strengthened 160 ksi (1103 MPa) Tensile StrengthAS870 Wrenching Configuration, Bi-Hexagonal (12-Point) Drive, Design Standard forAS1310 Fastener T
14、orque for Threaded Applications, Definitions ofAIR1471 Torque Tightening FastenersAS5054 Areas for Calculating Stress or Load Values for Externally and Internally Threaded UNJ FastenersAS5443 Wrenching Element, Spline Drive - Dimensions forAS5447 Nuts - Magnetic Particle, Fluorescent Penetrant, and
15、Contrast Dye Penetrant Inspection, Acceptance Criteria forAS7466 Bolts and Screws, Nickel Alloy, UNS N07718 Tensile Strength 185 ksi Fatigue Rated, Procurement SpecificationAS7467 Bolts and Screws, Nickel Alloy, UNS N07718 Tensile Strength 185 ksi Stress Rupture Rated, Procurement SpecificationAS887
16、9 Screw Threads - UNJ Profile, InchSAE AS5377 - 3 -2.1.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.GGG-W-636 Wrenches (Box, Open End, and Combination)MS 33787 Wrenching Element, External Spline, Dimens
17、ions forMIL-W-8982 Wrenches, Splined, High Strength, Thin Wall, General Specification forMIL-PFR-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base2.1.3 ANSI Publications: Available from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ANSI B4.1 Limits and Fits for Cylindrical Parts2.1.
18、4 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM E 112 Determining Average Grain SizeASTM E 140 Standard Hardness Conversion Tables for MetalsASTM E 1417 Liquid Penetrant ExaminationASTM D 3951 Commercial Packing2.1.5 ASME Publications: Available
19、 from ASME, 22 Law Drive, Box 2900, Fairfield, NJ 07007-2900.ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Forms)ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay)2.1.6 NAS Publications: Available from National Standards Association, Inc., 1200 Quince Orchard Boulevard, Gait
20、hersburg, MD 20878.NASM1312-6 Fastener Test Methods, Method 6, HardnessNASM1312-8 Fastener Test Methods, Method 8, Tensile Strength2.2 Definitions:Refer 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 blanking
21、 operation.INSPECTION LOT: Shall consist of nuts from a single production lot, of the same part number.NON-CONFORMANCE: A departure from a specified requirement for any characteristic.NON-CONFORMING UNIT: A unit of the product that has one or more non-conformances.SAE AS5377 - 4 -2.2 (Continued):PRO
22、DUCTION INSPECTION LOT: Shall be all finished 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 the vendors inspection at the same time.ROOM TEMPERATURE: Ambient temperatur
23、e (68 F approximately).TIGHT BURR: A burr closely compacted and binding in the periphery of a part without any loose ends and is within the dimensional limits of the part.2.3 Unit Symbols: - degree, angleC - degree CelsiusF - degree Fahrenheit% - percent (1% = 1/100)HRC - hardness, Rockwell C scalel
24、bf - pounds forcelbfin - pounds force-inch, torquepsi - pounds force per square inchcpm - cycles per minutein2 - square inchin Ra - microinch, roughness average3. TECHNICAL REQUIREMENTS:3.1 Material:Shall be a corrosion and heat resistant steel, AMS 5731, AMS 5732, AMS 5734, AMS 5737, or AMS5853 bar
25、s or forgings, as specified on the part drawing.3.2 Design:Finished (completely manufactured) parts shall conform to the following requirements:3.2.1 Dimensions: The dimensions of finished parts, after all processing, including plating, shall conform to the part drawing. Dimensions apply after plati
26、ng but before coating with solid film lubricants.3.2.1.1 Bearing Surface Perpendicularity: Shall be as specified on the part drawing when tested in accordance with Appendix A.3.2.1.2 Geometric Tolerances: Part features shall be within the geometric tolerance specified on the part drawing when tested
27、 by conventional measuring methods, except for bearing surface perpendicularity as in 3.2.1.1.SAE AS5377 - 5 -3.2.2 Surface Texture: Surface texture of finished parts, prior to plating, shall conform to the requirements specified on the part drawing, determined in accordance with ASME B46.1.3.2.3 Th
28、reads: Screw thread UNJ profile in accordance with AS8879.3.2.3.1 Countersink: The entering end of the thread at the bearing surface and the end of the thread at the top of nut shall be countersunk as specified on the part drawing.3.2.3.2 Plated Threads: Thread in plated nuts shall meet the material
29、 limits for coated threads specified in AS8879.3.2.3.3 After Forming Self-Locking Feature: The upper threaded portion shall be formed out of round in any manner which provides self-locking nuts meeting the locking torque requirements of this specification. Tension nuts having an overall length of th
30、e threaded portion not less than 1.2 times the nominal thread diameter shall allow the GO thread plug gage to enter the plated nut a minimum of three turns before engagement of the locking element; for nuts having a shorter threaded portion the GO thread plug gage shall be allowed to enter a minimum
31、 of three quarters of a turn.3.2.4 Construction: The 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 separate movement and shall not depend upon pressure on the bearing surface for the l
32、ocking action. Tool marks resulting from producing the self-locking feature shall blend smoothly without abrupt change.3.3 Heat Treatment:The nuts shall be solution and precipitation heat treated in accordance with AMS 2759/3 requirements for UNS S66286.3.4 Product Marking:Each part shall be identif
33、ication marked as specified on the part drawing. Depressed characters shall have a rounded root form, depressed 0.010 inches maximum depth.3.5 Plating:Unless otherwise specified, parts shall be silver plated on the threads only in accordance with AMS2411. The plating thickness on the thread flanks s
34、hall be not less than 0.0002 in when measured on the pitch diameter. Microscopic measurement of a sectioned nut shall be used as the referee method. Plating is optional in the counterbore or countersink and may be incomplete but no plating shall extend onto the bearing surface or the top of the nut.
35、SAE AS5377 - 6 -3.6 Lubrication:The nuts may be provided with a wax type coating which will prevent nut-bolt seizure at the initial installation provided such treatment is applicable to all production nuts of the same part number.3.7 Mechanical Properties:3.7.1 Hardness: Unless otherwise specified o
36、n 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 NASM1312-6. The minimum limit is controlled by the axial tensile strength requirement in 3.10.1.3.8 Metallurgical Properties:3.8.1 Microstructure: Parts shall
37、 have microstructure of completely recrystallized material, except for cold working effects of tapping and forming operation of locking feature.3.8.2 Grain Size: Shall be an average of ASTM No. 5 or finer with occasional grains as large as No. 2 in the base of the nut as determined by comparison of
38、a polished and etched specimen with ASTME112 Plate 2. In case of disagreement on grain size by the comparison method, the intercept (Heyn) procedure shall be used.3.9 Quality:Parts shall be uniform in quality and condition, free from loose burrs (tight burrs are acceptable), foreign materials, and f
39、rom imperfections detrimental to the usage of the part.3.9.1 Fluorescent Penetrant Inspection: Parts shall be subject to fluorescent penetrant inspection, prior to plating or with plating removed, in accordance with ASTM E 1417, Type 1, Sensitivity Level 2. Acceptance criteria of surface discontinui
40、ties shall be in accordance with AS5447.3.10 Product Performance Test:Refer to Tables 4 and 5 for details of sample sizes for Acceptance Test Plan and Qualification Approval Test Plan.3.10.1 Axial Tensile Strength: Nuts shall withstand the minimum tensile load as specified in Table 1 without rupture
41、, stripping, or appearance of cracks when tested as follows:3.10.1.1 As Received Condition at Room Temperature: Nuts in as received condition tested in accordance with NASM1312-8, using alloy steel test bolts hardened and tempered to 40 HRC minimum and having threads in accordance with 3.2.3, shall
42、withstand the axial tensile load specified in Table 1, applied at room temperature at the rate specified by Equation 3 in Table 1, Note /2/.SAE AS5377 - 7 -3.10.1.2 After Bake, at Room Temperature: Prior to testing, the nut shall be assembled on a bolt as specified in 3.11 with at least two thread t
43、urns protruding through the nut and baked for 6 hours 0.25 hour at 800 F 15 F, and then cooled to room temperature. A new test bolt shall be used for each axial tensile test. Nuts shall be tested, after baking, at room temperature in accordance with NASM1312-8 and shall withstand the axial tensile l
44、oad in Table 1, applied at the rate specified by Equation 3 in Table 1, Note /2/.TABLE 1 - Axial Tensile LoadNutThread SizeAxial TensileLoad at RoomTemperature-lbfminimum /1/NutThread SizeAxial TensileLoad at RoomTemperature-lbfminimum /1/0.7500-16UNJF-3B 63,240 1.2500-12UNJF-3B 179,7000.8750-14UNJF
45、-3B 86,280 1.3750-12UNJF-3B 219,2001.0000-12UNJF-3B 112,400 1.5000-12UNJF-3B 262,7001.1250-12UNJF-3B 144,100NOTES:/1/ Requirements above apply to the companion bolts with UNJ threads to Class 3A tolerance. Area upon which stress for axial load requirements is based is Equation 2 from AS5054 at 0.375
46、H thread depth at basic pitch and calculated from Equation 1:(Eq. 1)where:A = area at 0.375H thread depth, in2H = height of the sharp V-thread = (cos30)/n, inn = number of thread pitches per inchd = major diameter, maximum, inLoad requirements for axial strength load is based on 160,000 psi stress i
47、nduced on areaA.Axial tensile load is calculated from Equation 2:(Eq. 2)For sizes not shown, axial strength load for nuts shall be based upon the respective bolt stress area using Equations 1 and 2 and 160,000 psi stress./2/ (Eq. 3)where:d = basic major screw thread diameterA0.7854d0.750H()2 0.7854d
48、0.6495/n()2=Axial Tensile Load = 160,000 x A, for load in lbfMaximum Load, lbf/minute = 78,000 x d2SAE AS5377 - 8 -3.10.2 Wrench Torque: Nuts with hexagon, double hexagon wrenching feature conforming to AS870, or spline drive wrenching element conforming to AS5443 shall be tested as specified in App
49、endix B and shall withstand the wrench torques specified in Table 2 applied through five engagement cycles without any permanent deformation which can interfere with the use of socket wrenches conforming to GGG-W-636; or for nuts with the spline drive wrenching element interfere with socket wrenches conforming to MIL-W-8982.3.10.3 Permanent Set: Nuts shall be tested as specified in Appendix C, and the maximum prevailing torque shall not exceed the values in Table 3, Column (4), or be less than the minimum breakaway torque
