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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2008 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgAS4892A AEROSPACESTANDARDIssued 1999-05 Reaffirmed 2004-07 Revised 2008-07 Superseding AS4892 Insert, Screw Thread, Self-Locking, UNS S66286, Locked In, Key Locked Procurement Specification For FSC 5340 RATIONALECleanu
5、p obsolete documents throughout specification and correct typos. 1. SCOPE 1.1 Type This procurement specification covers inserts made from A286 alloy of the type identified under the Unified Numbering System as UNS S66286 which have self-locking internal threads and integrated locking keys to positi
6、vely secure the insert against rotation when properly installed in threaded holes. 1.2 Application Inserts covered by this specification are intended as general purpose fasteners. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in th
7、is specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary
8、measures to ensure the health and safety of all personnel involved. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall b
9、e 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, however, supersedes applicable laws and regulations unless a specific exemption has b
10、een obtained. SAE AS4892A - 2 -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 724-776-4970 (outside USA). www.sae.org.AMS2759/3 Heat Treatment Precipitation-Hardening Corrosion-Resistant and Mara
11、ging Steel Parts AMS5731 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 C) Solution Heat TreatedAMS5734 Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, and Tubing, 15Cr -
12、 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Consumable Electrode Melted, 1650 F (899 C) Solution Heat Treated AMS5737 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 Precipitat
13、ion Heat Treated AMS-QQ-A-225/6 Aluminum Alloy 2024, Bar, Rod, and Wire; Rolled, Drawn, or Cold Finished AMS-QQ-A-225/8 Aluminum Alloy 6061, Bar, Rod, Wire, and Special Shapes; Rolled, Drawn, or Cold Finished AMS-QQ-A-250/4 Aluminum Alloy 2024, Plate and Sheet AMS-QQ-A-250/11 Aluminum Alloy 6061, Pl
14、ate and Sheet AMS2700 Passivation of Corrosion Resistant Steels AS1310 Fastener Torque for Threaded Applications, Definitions of AS1701 Lubricant, Solid Film AS3545 Insert, Screw Thread, Self-Locking, Locked In, Key Locked, Heavy-Duty, Self-Broaching Keys, UNS S66286 AS3546 Insert, Screw Thread, Sel
15、f-Locking, Locked In, Key Locked, Extra Heavy Duty, Self-Broaching Keys, UNS S66286 AS4724 Studs and Inserts, Locked In, Self-Broaching Keys - Hole Dimensions and Installation RequirementsAS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root and Increased Minor Diameter SAE AS4892A - 3 -2
16、.1.1 U.S. Government Publications Available from the Document Automation and Production Services (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.FED-STD-H28/2 Screw-Thread Standards for Federal Services, Section 2, Unif
17、ied Inch Screw Threads-UN and UNR Thread Forms FED-STD-H28/20 Screw-Thread Standards for Federal Services, Section 20, Inspection Methods for Acceptability of UN, UNR, UNJ, M and MJ Screw-Threads MIL-HDBK-57 Listing of Fastener Manufacturers Identification Symbols 2.1.2 ASTM Publications Available f
18、rom ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610.832-9585, www.astm.org.ASTM A 342 Test Methods for Permeability of Feebly Magnetic Materials ASTM D 3951 Commercial Packaging ASTM E 1417 Liquid Penetrant Examination 2.1.3 ASME Publications Avai
19、lable from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org.ASME B46.1 Surface Texture (Surface Roughness, Waviness and Lay) 2.1.4 NAS Publications Available from Aerospace Industries Association, 1000 Wilson Boulevard,
20、Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org.NASM 1312-6 Fastener Test Methods, Method 6, Hardness NASM 1312-13 Fastener Test Methods, Method 13, Double Shear 2.2 Definitions Refer to AS1310 for definitions related to fastener torque. DEFECTIVE: A unit of product wh
21、ich contains one or more defects. INSPECTION LOT: Shall consist of inserts from a single production lot of the same part number. PRODUCTION LOT: Shall consist of finished inserts fabricated by the same process from a single heat of alloy, heat treated at the same time to the same condition, produced
22、 as one continuous run and submitted for vendors inspection at the same time. SAE AS4892A - 4 -2.3 Unit Symbols % - percent (1% = 1/100) in - inch in - square inch lbf - pounds force lbfin - pound force per inch ksi - kips (1000 pounds) per square inch HRC - hardness, Rockwell C scale 3. TECHNICAL R
23、EQUIREMENTS 3.1 Material Shall be a corrosion and heat resistant steel, AMS5731, AMS5734 or AMS5737 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 the finished parts, after all proc
24、essing including surface treatment, shall conform to the part drawing, unless otherwise specified. Dimensions shall apply before coating with dry film lubricants. 3.2.2 Surface Texture Surface texture of finished parts shall conform to the requirements as specified on the part drawing, determined in
25、 accordance with ASME B46.1. 3.2.3 Threads 3.2.3.1 Internal Threads Screw thread UNJ profile and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing.3.2.3.2 External Threads Screw thread UN profile and dimensions shall be in accordance with FED-STD-H28/2, un
26、less otherwise specified on the part drawing. Minor diameters shall be as specified on the part drawing. Prior to the assembly of the keys, the threads shall be inspected in conformance with FED-STD-H28/20, System 22. Assembled inserts (after key installation) shall be checked in a tapped hole prepa
27、red in accordance with AS4724. 3.2.3.3 Lead Threads External lead threads shall not exceed two pitches, including chamfer. SAE AS4892A - 5 -3.2.3.4 Thread Forming Threads may be produced either by machining, grinding, or fully formed by a single rolling process. 3.2.3.5 Self-Locking Feature Threads
28、in the area of the self-locking feature may be displaced or deformed radially in a manner that is in conformance with the part drawing. A bolt or screw must enter a minimum of 3/4 of a turn before engagement of the locking feature. The insert shall provide locking torque within the limits of Table 1
29、. 3.3 Heat Treatment Shall conform to the technical requirements and other provisions specified in AMS2759/3 for A286, 1650 F solution treatment and 1325 F aging treatment. 3.3.1 Solution Heat Treatment Inserts, unless machined from solution heat treated stock or AMS5737 steel, shall be solution hea
30、t treated as in 3.3. 3.3.2 Aging Treatment Solution heat treated inserts shall be heat treated by aging as in 3.3. 3.4 Surface Treatment 3.4.1 Inserts, less the keys, shall be passivated in accordance with AMS2700. The key wire material shall be passivated in accordance with AMS2700 prior to assembl
31、y in the insert. Following passivation the inserts shall be dry film lubricated in accordance with AS1701. The locking keys may or may not be lubricated. 3.5 Runout The internal thread pitch diameter shall have a circular runout with the external pitch diameter within .006 in FIM. 3.6 Source Identif
32、ication Mark The insert shall be marked on the key tang or insert body. The source identification insignia for a manufacturer shall be in accordance with MIL-HDBK-57 or a private label distributors insignia, as applicable. The source identification mark shall be legible and permanent. 3.7 Magnetic P
33、ermeability Inserts shall have a magnetic permeability of 2.0 maximum (Air = 1.0) for a field of H = 200 oersteds, when tested in conformance with ASTM A 342. 3.8 Mechanical Properties Parts shall conform to the requirements of 3.8.1, 3.8.3, 3.8.4, and 3.8.5. SAE AS4892A - 6 -3.8.1 Tensile Strength
34、(Proof) Parts shall withstand a proof load not lower than that specified in Table 2 with or without the locking keys installed. Inserts shall be installed in test blocks (Figure 2) specified in 4.5.1, and tested with test bolts as specified in 4.5.3.1. Thetest bolt shall be assembled into the insert
35、 and shall be of sufficient length to extend through the insert a minimum of two (2) pitches. The test shall be conducted in fixtures shown in Figure 1. The minimum proof load as specified in Table 2, as applicable, shall then be applied to the assembly without failure occurring. In the event of bol
36、t failure below the applicable proof load, the test shall be repeated until the applicable proof rating of the insert is exceeded. The rate of loading shall not exceed 100 ksi per minute based on the shank area of the bolt. 3.8.2 Resistance to Pull-out (Reference only) Tables 3 and 4 contain tabulat
37、ed minimum shear engagement areas and the associated minimum pullout loads as a function of internal thread size for each of the AS3545 and AS3546 inserts when installed in a material possessing a shear strength of 27 ksi. The data contained in Table 3 and Table 4 is provided as reference-only infor
38、mation for determining the pull-out strength of the inserts in materials other than that noted. 3.8.3 Rotational Resistance (Proof) Parts shall withstand a torque load not lower than that specified in Table 5. Inserts shall be installed in test blocks (Figure2) as specified in 4.5.1, and tested with
39、 test bolts as specified in 4.5.3.1. The test shall be conducted as specified in Figure 3. The rotational force is to be applied with a torque wrench and the torque listed in Table 5, as applicable, shall be reached with no axial load exerted on the test block. Failure of the insert to remain in the
40、 test block shall be cause for rejection.3.8.4 Self-locking Torque Test Inserts shall be installed in test blocks (Figure 2) specified in 4.5.1, and tested with test bolts as specified in 4.5.3.2 withsufficient thread length to extend beyond the locking feature a minimum of two (2) pitches. The bolt
41、 shall be engaged and disengaged from the assembled insert self-locking feature for a full 15 installation and removal cycles with no axial load in the insert. The test shall be run at a rate slow enough to yield a dependable measure of torque, and to avoid overheating the bolt. The installation cyc
42、le shall be considered complete when two (2) threads extend past the locking feature. The removal cycle shall be considered complete when the locking feature is disengaged. The maximum locking torque shall not exceed the values specified in Table 1. The minimum breakaway torque shall not be less tha
43、n the values specified in Table 1. 3.8.5 Hardness Shall be uniform and within the range of 31 to 36 HRC but parts shall not be rejected on the basis of hardness as determined by MIL-STD-1312-6 in accordance with NASM 1312-6, if the strength requirements of this specification are met.3.9 Quality Part
44、s shall be uniform in quality and condition, clean, sound, smooth, and free from burrs, foreign materials, and imperfections detrimental to the usage of the parts. 3.9.1 Fluorescent Penetrant Inspection Inserts shall be subject to fluorescent penetrant inspection in accordance with ASTM E 1417, Type
45、 I, Sensitivity Level 2. The inspection shall be performed subsequent to any processing operation which could adversely affect the outcome of the inspection process. Penetrant inspection indications alone shall not be cause for rejection. If indications are considered cause for rejection, representa
46、tive samples shall be taken from those inserts showing indications and these samples shall be further examined as specified in 3.9.2. SAE AS4892A - 7 -3.9.1.1 Discontinuities Examination of longitudinal or transverse sections of the insert shall reveal no discontinuities such as cracks, laps, seams,
47、 or inclusions except laps in threads as permitted in 3.9.2.1.3 and 3.9.2.1.4. 3.9.2 Microscopic Examination Specimens cut from parts shall be polished, etched with a suitable etchant and examined at a magnification not lower than 100X to determine conformance to the requirements of 3.9.2.1. 3.9.2.1
48、 Threads 3.9.2.1.1 Root defects such as laps, seams, notches, slivers, folds, and roughness are not permissible (see Figure 4). 3.9.2.1.2 Multiple laps on the flanks of threads are not permissible regardless of location. Single laps on the flanks of threads that extend towards the root are not permi
49、ssible (see Figures 5 and 6). 3.9.2.1.3 There shall be no laps along the flank of the thread below the pitch diameter (see Figure 7). A single lap is permissible along the flank of the thread above the pitch diameter on either the pressure or non-pressure flank (one lap at any cross-section through the thread) provided that it extends toward the crest and generally parallel to the flank (see Figure 7). 3.9.2.1.4 Crest craters, cres
