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 2011 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: +1 724-776-4970 (outside US
4、A) 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/AS7473BAEROSPACESTANDARDAS7473 REV. B Issued 1991-02 Reaffirmed 2004-07 Revised 2011-10 Superse
5、ding AS7473A Bolts and Screws, Roll Threaded Procurement Specification For FSC 5306RATIONALETo revise paragraph 3.6 by adding “two to” three threads in agreement with NASM1312 test methodology and general updating of specifications and SAE formatting requirements. 1. SCOPE 1.1 Types This procurement
6、 specification covers bolts and screws made from carbon steels, high expansion steels, or corrosion and heat resistant steels of the type identified under the Unified Numbering System as follows: a. UNS K00802 - carbon steel (AMS5061) b. UNS K91505 - high expansion steel (AMS5624) c. UNS K91456 - hi
7、gh expansion steel (AMS5625) d. UNS S32100 - corrosion and heat resistant steel (AMS5645) e. UNS S34700 - corrosion and heat resistant steel (AMS5646) 1.2 Application Primarily for parts of carbon and low alloy steels, corrosion and heat resistant steel and alloys, and high expansion steels not subj
8、ected to heat treatment during manufacture. Parts of steels such as AMS5061 are generally for use where stresses are low at moderate temperatures. Parts of corrosion and heat resistant steels and alloys such as AMS5645 or AMS5646 are generally for use at elevated temperatures where stresses are low.
9、 Parts of high expansion steels such as AMS5624 or AMS5625 are generally for use at lower temperatures where expansion approaching that of aluminum and magnesium alloys is required. 1.2.1 This specification may also be used to control the manufacture, characteristics, and quality of parts subjected
10、to heat treatment during manufacture but the stage of manufacture at which heat treatment shall be performed, the actual heat treatment, and the mechanical properties of such parts are to be specified, where required, on the part drawing. SAE AS7473B Page 2 of 19 1.3 Safety - Hazardous Materials Whi
11、le the materials, methods, applications, and processes described or referenced in this 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
12、 safe and proper use of any hazardous materials and to take necessary precautionary 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 document to the extent specified herein. The latest issue of S
13、AE 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. Nothing in this document, howeve
14、r, 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 724-776-4970 (outside USA), www.sae.org.AMS5061 Steel
15、, Low Carbon, Bars and Wire 0.08 to 0.20 C AMS5624 Steel Bars, High Expansion, 4.5Mn 4.0Cr 12.5Ni (0.50-0.60C), Cold Finished AMS5625 Steel Bars, High Expansion, 9.5Ni 5.5Mn (0.55-0.65C) Cold Finished AMS5645 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing, and Rings 18Cr 10Ni 0.40
16、Ti(SAE 30321) Solution Heat Treated AMS5646 Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, Tubing, and Rings 18Cr 11Ni 0.60Cb (SAE 30347) Solution Heat Treated AS1132 Bolts, Screws and Nuts - External Wrenching UNJ Thread, Inch - Design Standard AS3062 Bolts, Screws, and Studs, Screw Thr
17、ead Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root with Increased Minor Diameter 2.1.2 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 R
18、obbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/.MIL-STD-2073-1 DoD Materiel, Procedures for Development and Application of Packaging Requirements SAE AS7473B Page 3 of 19 2.1.3 AIA Publications AIA Publications: Available from Aerospace Industrie
19、s Association, 1000 Wilson Boulevard, Suite 1700, Arlington,VA 22209-3928, Tel: 703-358-1000, www.aia-aerospace.org.NASM 1312 Fastener test methods NASM 1312-6 Fastener Test Methods, Method 6, Hardness NASM 1312-8 Fastener Test Methods, Method 8, Tensile Strength NASM 1312-12 Fastener Test Methods,
20、Method 12, Thickness of Metallic Coatings 2.1.4 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O.Box Box 2900, Fairfield, NJ 07007-2900 Tel 973-882-1170, www.asme.orgASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay) 2.1.5 ASTM Publications
21、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 E 8 Tension Testing of Metallic Materials ASTM E 1444 Magnetic Particle Examination ASTM E 1417 Liquid Penetrant Inspection 2.2 Definitions DEFECTIVE: A uni
22、t of product which contains one or more defects.PRODUCTION 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 vendors inspection at the
23、 same time. 2.3 Unit Symbols A ampere F degree Fahrenheit cm3cubic centimeter g gram in2square inch % percent (1% = 1/100) ksi kips (1000 pounds) per square inch min minute of time sp gr specific gravity HRC hardness, Rockwell C scale SAE AS7473B Page 4 of 19 3. TECHNICAL REQUIREMENTS 3.1 Material U
24、nless otherwise specified on the part drawing, the material shall be as selected from Table 1 and 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, in
25、cluding plating, shall conform to the part drawing. Dimensions apply after plating but before coating with dry film lubricants. 3.2.2 Surface Texture Surface texture of finished parts, prior to plating or coating, shall conform to the requirements as specified on the part drawing, determined in acco
26、rdance with ASME B46.1. 3.2.3 Threads Screw thread UNJ profile and dimensions shall be in accordance with AS8879, unless otherwise specified on the part drawing. 3.2.3.1 Incomplete Threads Incomplete threads are permissible at the chamfered end and the juncture of the unthreaded portion of the shank
27、 or adjacent to the head as specified in AS3062. 3.2.3.2 Chamfer The entering end of the thread shall be chamfered as specified on the part drawing. 3.2.4 Geometric Tolerances Part features shall be within the geometric tolerances specified on the part drawing and, where applicable, controlled in ac
28、cordance with AS3063. 3.3 Fabrication 3.3.1 Blanks AMS5061, AMS5645, and AMS5646 heads shall be formed by hot forging, cold forging, or machining. AMS5624 and AMS5625 heads shall be formed by hot forging or machining. Lightening holes may be produced by any suitable method. Wrenching recesses may be
29、 forged or machined. Flash or chip clearance in machined recesses shall not cause recess dimensions to exceed the specified limits. 3.3.2 Oxide and Decarburization Removal Surface oxide and oxide penetration, and decarburization resulting from prior heat treatment shall be removed from the full body
30、 diameter and bearing surface of the head prior to cold working the fillet radius when specified and rolling the threads. The oxide and decarburization removal process shall produce no intergranular attack or corrosion of the blanks. The metal removed from the bearing surface of the head and the ful
31、l body diameter of the shank shall be as little as practicable to obtain a clean, smooth surface and in no case, shall be so great as to produce more cutting of flow lines in the head-to-shank junction than shown in Figure 1B. SAE AS7473B Page 5 of 19 3.3.3 Cold Working of Fillet Radius After remova
32、l of oxide and decarburization as in 3.3.2, the head-to-shank fillet radius of headed parts having the radius complete throughout the circumference of the part shall, when specified, be cold worked sufficiently to remove all visual evidence of grinding or tool marks. Distortion due to cold working s
33、hall conform to Figure 2, unless otherwise specified on the part drawing. It shall not raise metal more than 0.002 inch above the contour at “A“ or depress metal more than 0.002 inch below the contour at “B“ as shown in Figure 2; distorted areas shall not extend beyond “C“ as shown in Figure 2. In c
34、onfigurations having an undercut connected with the fillet radius, the cold working will be required only for 90 degrees of fillet arc, starting at the point of tangency of the fillet radius and the bearing surface of the head. 3.3.4 Thread Rolling Threads shall be formed on the finished blanks by a
35、 single rolling process after removal of oxide and decarburization as in 3.3.2 and after heat treatment if performed. 3.3.5 Cleaning Parts of AMS5061, AMS5624 and AMS5625, after finishing shall be degreased and cleaned in a suitable solvent. Parts of AMS5645 and AMS5646 shall be degreased and immers
36、ed in one of the following solutions for the time and temperature shown: a. One volume of nitric acid (sp gr 1.42) and 9 volumes of water for not less than 20 min at room temperature. b. One volume of nitric acid (sp gr 1.42) and 4 volumes of water for 30 to 40 min at room temperature. c. One volume
37、 of nitric acid (sp gr 1.42) and 4 volumes of water for 10 to 15 min at 140 to 160 F. 3.4 Product Marking Each part shall be identification marked as specified on the part drawing. The markings may be formed by forging or stamping, raised or depressed 0.010 inch maximum, with rounded root form on de
38、pressed characters. 3.5 Plating Where required, any protective treatment shall be as specified on the part drawing. Thickness determined in accordance with MIL-STD-1312-12 in accordance with NASM1312-12. 3.6 Mechanical Properties Parts shall conform, as applicable, to the requirements of 3.6.1, 3.6.
39、2, and 3.6.3. Threaded members of gripping fixtures for tests requiring tensile loads shall be of sufficient size and strength to develop the full strength of the part without stripping the thread. The loaded portion of the shank shall have a minimum two to three full thread turns from the thread ru
40、nout exposed between the loading fixtures during the test wherein tensile loading is applied. Finished parts shall be tested for the following requirements in accordance with the following applicable test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM 1312-6 b. Room Temperature Ultimat
41、e Tensile Strength: MIL-STD-1312-8 in accordance with NASM 1312-8 3.6.1 For AMS5061, AMS5645, and AMS5646 mechanical properties shall be as specified on the part drawing. 3.6.2 Ultimate Tensile Strength at Room Temperature AMS5625 finished parts shall have an ultimate tensile load not lower than tha
42、t specified in Table 3 and shall be tested to failure, first measuring and recording the maximum tensile load achieved. If the size or shape of the part is such that failure would occur outside the threaded section but the part can be tested satisfactorily, such as parts having a shank diameter equa
43、l to or less than the thread root diameter or having an undercut, parts shall conform to only the tensile strength requirements of 3.6.2.1; for such parts, the diameter of the area on which stress is based shall be the actual measured minimum diameter of the part. SAE AS7473B Page 6 of 19 3.6.2.1 Ma
44、chined Test Specimens If the size or shape of the part is such that a tensile test cannot be made on the part, tensile tests shall be conducted in accordance with ASTM E 8 on specimens as in 4.4.6. Specimens may be required by purchaser to perform confirmatory tests. Specimens shall meet the followi
45、ng requirements: a. Ultimate Tensile Strength, minimum: 125 ksi b. Yield Strength at 0.2% Offset, minimum: 100 ksi c. Elongation in 2 inch or 4D, minimum: 15% d. Reduction of Area, minimum: 20% 3.6.2.1.1 When permitted by purchaser, hardness tests on the end of parts may be substituted for tensile t
46、ests of machined specimens. 3.6.3 Hardness Hardness at mid-radius of unthreaded shank cross-section for AMS5624 and AMS5625 parts shall be as follows: a. AMS5624: 27 to 38 HRC b. AMS5625 1. Nominal diameter up to 1.0 inch, incl: 25 to 36 HRC 2. Nominal diameter over 1.0 inch: 24 to 36 HRC 3.7 Qualit
47、y Parts shall be uniform in quality and condition, clean, sound, smooth, and free from burrs and foreign materials, and from imperfections, detrimental to the usage of the parts. 3.7.1 Macroscopic Examination Parts or sections of parts, as applicable, shall be etched in a solution consisting of appr
48、oximately 50% hydrochloric acid (sp gr 1.19) and 50% water, or other suitable etchant, for sufficient time to reveal flow lines but not longer than 15 min, and then be examined at a magnification of approximately 20X to determine conformance to the requirements of 3.7.1.1 and 3.7.1.2. 3.7.1.1 Flow L
49、ines 3.7.1.1.1 Head-to-Shank If parts have forged heads, examination of a longitudinal section through the part shall show flow lines in the shank, head-to-shank fillet, and bearing surface which follow the contour of the part as shown in Figure 1A, except that slight cutting of flow lines by the oxide and decarburization removal process of 3.3.3 is permissible, as shown in Figure 1B; excessive cutting of flow l
