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 there
2、from, 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 2013 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS5878AEROSPACESTANDARDAS5878Issued 2005-06 Reaffirmed 2013-10 Nut, Self-Locking,
5、Nickel Alloy, UNS N07001, 1400 F, 180,000 psi, UNJ Thread Procurement Specification RATIONALE AS5878 has been reaffirmed to comply with the SAE five-year review policy. 1. SCOPE: 1.1 Type: This specification establishes the requirements for the following types of self-locking nuts in thread diameter
6、 sizes 0.1380 through 0.6250 inches: a. Wrenching Nuts: i.e., hexagon, double hexagon and spline nuts. b. Anchor Nuts: i.e., plate nuts, gang channel nuts, and shank nuts. The wrenching nuts, shank nuts, and nut elements of plate and gang channel nuts are made of a corrosion and heat resistant nicke
7、l-base alloy of the type identified under the Unified Numbering System as UNS N07001 and of 180,000 psi axial tensile strength at room temperature, with maximum conditioning of parts at 1400 F prior to room temperature testing. 1.2 Application: Primarily for use in aerospace propulsion systems up to
8、 approximately 1400 F for tension height nuts made from bar, forging, or sheet. Nuts are designed for use with bolts capable of developing 180,000 psi tensile strength at room temperature and having UNJ profile threads. 2. REFERENCES: 2.1 Applicable Documents: The following publications form a part
9、of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other documents 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
10、text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. AMS 5525 Steel, Corrosion and Heat Resis
11、tant, Sheet, Strip, and Plate 15Cr 25.5Ni 1.2Mo 2.1Ti 0.006B 0.30V, 1800 F (982 C) Solution Heat Treated AMS 5708 Nickel Alloy, Corrosion and Heat Resistant, Bars, Forgings, and Rings 58Ni 19.5Cr 13.5Co 4.3Mo 3.0Ti 1.4Al Consumable Electrode or Vacuum Induction Melted 1975 F (1079 C) Solution Heat T
12、reated AMS 5709 Nickel Alloy, Corrosion and Heat Resistant, Bars and Forgings 58Ni 19.5Cr 13.5Co 4.3Mo 3.0Ti 1.4Al 0.05Zr 0.006B, Consumable Electrode or Vacuum Induction Melted, 1975 F (1079 C) Solution, Stabilization, and Precipitation Heat Treated AS870 Wrenching Configuration, Double Hexagon (12
13、-Point), for Threaded Fasteners AS954 Design Data and Standardization of Thin Wall 12-Point Sockets and Box Wrenches for Aerospace Engine Use AS1310 Fastener Torque for Threaded Applications, Definitions of AS1701 Lubricant, Solid Dry Film AS5447 Acceptance Criteria for Nuts - Magnetic Particle, Flu
14、orescent Penetrant, and Visible Penetrant Examination AS7471 Bolts and Screws, Nickel Alloy, UNS N07001 Tensile Strength 165 ksi, Corrosion and Heat Resistant Procurement Specification SAE INTERNATIONAL AS5878 Page 2 of 40_ 2.1.1 (Continued): AS8879 Screw Threads, Controlled Radius Root With Increas
15、ed Minor Diameter; General Specification for 2.1.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094. MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base 2.1.3 ASTM Publications: Available f
16、rom ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM E 140 Standard Hardness Conversion Tables for Metals ASTM E 1417 Liquid Penetrant Examination ASTM D 3951 Commercial Packaging 2.1.4 ASME Publications: Available from ASME, 22 Law Drive, Box 2900, Fairfield, NJ 07007-2900. ASME
17、B46.1 Surface Texture (Surface Roughness, Waviness, and Lay) 2.1.5 NAS Publications: Available from Aerospace Industries Association, 1250 Eye Street NW, Washington, DC 20005-3924. NAS3353 Fixture - Bearing Surface Squareness Test Self-Locking Nuts NASM1312-6 Fastener Test Methods, Method 6, Hardnes
18、s NASM1312-7 Fastener Test Methods, Method 7, Vibration NASM1312-8 Fastener Test Methods, Method 8, Tensile Strength SAE INTERNATIONAL AS5878 Page 3 of 40_ 2.2 Definitions: Refer to AS1310 for definitions related to fastener torque. BURR: A rough edge or ridge left on the metal due to a cutting, gri
19、nding, piercing or blanking 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 LO
20、T: Shall be all furnished 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).
21、 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, angular C degree Celsius F degree Fahrenheit % percent (1% = 1/100) HRC hardness, Rockwell C scale lbf pound-force lbf-in po
22、und-force inch, torque psi pound-force per square inch cpm cycles per minute in2 square inch in Ra microinch, roughness average SAE INTERNATIONAL AS5878 Page 4 of 40_ 3. TECHNICAL REQUIREMENTS: 3.1 Material: Shall be a corrosion and heat resistant, nickel-based alloy, AMS 5708, AMS 5709 or as specif
23、ied on the part drawing for wrenching nuts, shank nuts and nut elements for plate and gang channel nuts. When specified on the part drawing, wrenching nuts, shank nuts and nut elements for plate and gang channel nuts may be formed from AMS 5525 sheet. Material for the retaining plate for plate nuts
24、and channel for gang channel nuts shall be capable of meeting the requirements of this specification, and shall be 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, a
25、fter all processing shall conform to the part drawing. Dimensions apply before coating with dry 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
26、the geometric tolerance specified 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 Texture: Surface texture of finished parts, prior to coating, shall conform to the requirements as specified on the part drawi
27、ng, determined in accordance with ASME B46.1. 3.2.3 Threads: 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 Coate
28、d Threads: Threads in coated nuts shall meet the material 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
29、specification. The coated 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 having shorter threaded portion shall allo
30、w GO thread plug gage to enter a minimum of three quarters of a turn. SAE INTERNATIONAL AS5878 Page 5 of 40_ 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 separ
31、ate 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 Treatment: The formed and machined nuts shall be solution, stabilization, and precipitation
32、 heat treated in accordance with the heat treating procedure specified in the material specification, except that the time for stabilization heat treatment may be extended up to 24 hours. 3.4 Product Marking: Each part shall be identification marked as specified on the part drawing. Depressed charac
33、ters shall have a rounded root form with a depth of 0.010 inch maximum. 3.5 Coating: Nuts shall be coated with dry film lubrication in accordance with AS1701, Class IV, unless otherwise specified on the part drawing. On nuts with nominal thread sizes 0.2500 inch and larger, the coating thickness sha
34、ll be not less than 0.0002 inch when measured on the thread pitch diameter and bearing surface. Microscopic measurement on a sectioned nut shall be used as a referee method. Nuts with thread sizes smaller than 0.2500 inch shall show complete coating coverage on the threads and bearing surface. Coati
35、ng on other surfaces shall be optional and maybe incomplete. 3.6 Mechanical Properties: 3.6.1 Hardness: Unless otherwise specified on the part drawing, the core hardness after heat treatment as in 3.3 shall be no greater than 44 HRC (see 8.1), determined in accordance with MIL-STD-1312-6. The minimu
36、m limit is controlled by the axial tensile strength requirement in 3.9.1. 3.7 Metallurgical Properties: 3.7.1 Microstructure: Wrenching nuts and nut elements of anchor nuts shall have microstructure of completely recrystallized material, except for cold working effects of tapping and forming operati
37、on of locking feature. SAE INTERNATIONAL AS5878 Page 6 of 40_ 3.8 Quality: Parts shall be uniform in quality and condition, free from loose burrs, foreign materials, and from imperfections detrimental to the usage of the part. 3.8.1 Fluorescent Penetrant Inspection: Parts shall be subject to fluores
38、cent penetrant inspection, prior to coating or with coating removed, in accordance with ASTM E 1417, Type 1, Sensitivity Level 2. Acceptance criteria of surface discontinuities shall be in accordance with AS5447. 3.9 Product Performance Test: Refer to Tables 7 and 8 for details of sample sizes for A
39、cceptance Test Plan and Qualification Approval Test Plan. 3.9.1 Axial Tensile Strength: Nuts shall withstand the minimum tensile load as specified in Table 1 without rupture, stripping, or appearance of cracks when tested as follows: 3.9.1.1 As Received Condition at Room Temperature: Nuts in as rece
40、ived condition tested in accordance with MIL-STD-1312-8, using alloy steel test bolts hardened and tempered to 40 HRC minimum and having threads in accordance with AS8879, shall withstand the axial tensile load specified in Table 1, applied at room temperature at the rate specified in Note /2/. 3.9.
41、1.2 After Bake, at Room Temperature: Prior to testing, the nut shall be assembled on a bolt as specified in 3.10 with at least two thread turns protruding through the nut and baked for 6 hours 0.25 hour at 1400 F 15 F, and then cooled to room temperature. A new test bolt shall be used for each axial
42、 tensile test. Nuts, after baking, tested in accordance with MIL-STD-1312-8, using alloy steel bolts hardened and tempered to 40 HRC minimum and having threads in accordance with AS8879, shall withstand the axial tensile load in Table 1, applied at room temperature at the rate specified in Note /2/.
43、 SAE INTERNATIONAL AS5878 Page 7 of 40_ TABLE 1 - Axial Tensile Load Nut Thread Size Axial Tensile Load at Room Temp. lbf minimum /1/ 0.1380 -32UNJC-3B 1 960 0.1380 -40UNJF-3B 2 100 0.1640 -32UNJC-3B 2 920 0.1640 -36UNJF-3B 3 010 0.1900 -32UNJF-3B 4 070 0.2500 -28UNJF-3B 7 270 0.3125 -24UNJF-3B 11 5
44、20 0.3750 -24UNJF-3B 17 120 0.4375 -20UNJF-3B 23 190 0.5000 -20UNJF-3B 30 900 0.5625 -18UNJF-3B 39 180 0.6250 -18UNJF-3B 49 030 NOTES: /1/ Requirements above apply to companion bolts with UNJ threads to Class 3A tolerance. Area upon which stress for axial strength load requirements is based on the U
45、NJ basic pitch diameter (max PD) at 0.375H thread depth and calculated from equation: 222)p6495(.d7854.0)n/6495(.d7854.0)H750.0(d7854.0A=(Eq. 1) where: A = Area at the UNJ basic pitch diameter at 0.375H thread depth, in2d = Maximum major diameter, inch H = Height of the sharp V-thread = (cos 30) / n
46、, inch n = Number of threads per inch p = Pitch (1 / n), inch Load requirements for axial strength load is based on 180 000 psi stress induced on area A. Axial tensile load is calculated from equation: lbf in load for x A,000 180 Load Tensile Axial = (Eq. 2) For sizes not shown, axial tensile streng
47、th load for nuts shall be based upon the respective bolt stress area using above equations and 180 000 psi stress. /2/ 2D x 000 78 lbf/minute Load, Maximum = (Eq. 3) where: D = nominal major diameter of thread SAE INTERNATIONAL AS5878 Page 8 of 40_ 3.9.1.3 Shank Nuts: Nuts with shanks designed to be flared at assembly (see Figure 1) sh
