SAE AS 7473C-2018 Bolts and Screws Roll Threaded Procurement Specification For.pdf

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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 ther

2、efrom, 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 2018 SAE International All rights reserved. No part of this

3、publication 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: +1 724-776-49

4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AS7473C AEROSPACE STANDARD AS7473 REV. C Issued 1991-02 Reaffirmed 2004-07 Revised 2018-01 Sup

5、erseding AS7473B Bolts and Screws, Roll Threaded Procurement Specification For FSC 5306 RATIONALE AS6416 added, specs updated through out document, Paragraphs 3.3.2, 3.7.1.1.1 and 3.7.2.1 updated, para 3.7.2 magnification changed from 100 to 200X Figures 1A. 1B and 1C deleted, figures updated and ta

6、ble 2 edited. 1. SCOPE 1.1 Types This procurement 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 -

7、high expansion steel (AMS5624) c. UNS K91456 - high 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 ste

8、el and alloys, and high expansion steels not subjected 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

9、 at elevated temperatures where stresses are low. 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,

10、 characteristics, and quality of parts subjected 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 INTERNAT

11、IONAL AS7473C Page 2 of 19 1.3 Safety - Hazardous Materials While 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

12、 sole responsibility of the user to ensure familiarity with the 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

13、 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 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 t

14、his 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 International, 400 Commonwealth Drive, Warrendale, PA, 15096-0001, Tel: 877-606-7323 (inside USA and C

15、anada) or +1 724-776-4970 (outside USA), www.sae.org. AMS5061 Steel, 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 Hea

16、t Resistant, Bars, Wire, Forgings, Tubing, and Rings 18Cr 10Ni 0.40Ti (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 Threa

17、d, Inch - Design Standard AS3062 Bolts, Screws, and Studs, Screw Thread Requirements AS3063 Bolts, Screws, and Studs, Geometric Control Requirements AS6416 Bolts, Screws, Studs and Nuts, Definitions for Design, Testing and Procurement AS8879 Screw Threads - UNJ Profile, Inch, Controlled Radius Root

18、with Increased Minor Diameter 2.1.2 U.S. Military Specifications and Standards Copies of these documents are available at http:/quicksearch.dla.mil. MIL-STD-2073-1 DoD Materiel, Procedures for Development and Application of Packaging Requirements SAE INTERNATIONAL AS7473C Page 3 of 19 2.1.3 AIA Publ

19、ications AIA Publications: Available from Aerospace Industries 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, M

20、ethod 8, Tensile Strength NASM 1312-12 Fastener Test Methods, 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.org ASME B46.1 Surface Texture

21、(Surface Roughness, Waviness, and Lay) 2.1.5 ASTM Publications 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 E8/E8M Tension Testing of Metallic Materials ASTM E1444/E1444M Magnetic Particle Examination

22、 ASTM E1417/E1417M Liquid Penetrant Inspection 2.2 Definitions See AS6416 2.3 Unit Symbols A ampere F degree Fahrenheit cm3 cubic centimeter g gram in2 square 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 S

23、AE INTERNATIONAL AS7473C Page 4 of 19 3. TECHNICAL REQUIREMENTS 3.1 Material Unless 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 requiremen

24、ts: 3.2.1 Dimensions The dimensions of finished parts, after all processing, including 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 c

25、onform to the requirements as specified on the part drawing, determined in accordance 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 permissib

26、le at the chamfered end and the juncture of the unthreaded portion of the shank 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 t

27、olerances specified on the part drawing and, where applicable, controlled in accordance 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. Lig

28、htening holes may be produced by any suitable method. Wrenching recesses may be 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 decarbur

29、ization resulting from prior heat treatment shall be removed from the full body 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

30、 the blanks. SAE INTERNATIONAL AS7473C Page 5 of 19 3.3.3 Cold Working of Fillet Radius After removal 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 su

31、fficiently to remove all visual evidence of grinding or tool marks. Distortion due to cold working shall 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

32、 at “B“ as shown in Figure 2; distorted areas shall not extend beyond “C“ as shown in Figure 2. In configurations 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 b

33、earing surface of the head. 3.3.4 Thread Rolling Threads shall be formed on the finished blanks by a 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 deg

34、reased and cleaned in a suitable solvent. Parts of AMS5645 and AMS5646 shall be degreased and immersed 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 minutes at room temperature. b. One volum

35、e of nitric acid (sp gr 1.42) and 4 volumes of water for 30 to 40 minutes at room temperature. c. One volume of nitric acid (sp gr 1.42) and 4 volumes of water for 10 to 15 minutes at 140 to 160 F. 3.4 Product Marking Each part shall be identification marked as specified on the part drawing. The mar

36、kings may be formed by forging or stamping, raised or depressed 0.010 inch maximum, with rounded root form on depressed 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 wi

37、th NASM1312-12. 3.6 Mechanical Properties Parts shall conform, as applicable, to the requirements of 3.6.1, 3.6.2, 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 th

38、e thread. The loaded portion of the shank shall have a minimum two to three full thread turns from the thread runout 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

39、 applicable test methods: a. Hardness: MIL-STD-1312-6 in accordance with NASM 1312-6 b. Room Temperature Ultimate 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 Te

40、nsile Strength at Room Temperature AMS5625 finished parts shall have an ultimate tensile load not lower than that 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 ou

41、tside the threaded section but the part can be tested satisfactorily, such as parts having a shank diameter equal 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 whic

42、h stress is based shall be the actual measured minimum diameter of the part. SAE INTERNATIONAL AS7473C Page 6 of 19 3.6.2.1 Machined 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 E8/E8M

43、 on specimens as in 4.4.6. Specimens may be required by purchaser to perform confirmatory tests. Specimens shall meet the following 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

44、 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 tests 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

45、 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 Quality 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

46、 parts. 3.7.1 Macroscopic Examination Parts or sections of parts, as applicable, shall be etched in a solution consisting of approximately 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 minutes, and then be

47、 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 Lines 3.7.1.1.1 Head-to-Shank When required, after heading and prior to heat treatment, examination of an etched section taken longitudinally through the blank shall sh

48、ow flow lines in head-to-shank fillet and bearing surface which are representative of a forging process and shall follow the head contour. Flow lines in upset heads on parts having special heads, such as Dee- or Tee-shaped heads or thinner than AS1132 standard heads, shall be as agreed upon by purch

49、aser and vendor. SAE INTERNATIONAL AS7473C Page 7 of 19 3.7.1.1.2 Threads Flow lines in threads shall be continuous, shall follow the general thread contour, and shall be of maximum density at root of thread (see Figure 2). 3.7.1.2 Internal Defects Examination of longitudinal sections of the head and shank and of the threads shall reveal no cracks, laps, or porosity except laps in threads as permitted in 3.7.2.3.3 and 3.7.2.3.4. Th