NASM 1312-12-1997 Fastener Test Methods - Method 12.pdf

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1、NASM 1312-12-1997 Fastener Test Methods - Method 12_NASM1312-12 29 August 1997 ADOPTION NOTICE NASM13 12-12, “Fastener Test Methods Method 12 Thickness of Metallic Coatings” was adopted on 29 August 1997 for use by the Department of Defense OD). Proposed changes by DoD activities must be submitted t

2、o the DoD Adopting Activity: Commander, Naval Air Warfare Center Aircraft Division, Code 4141OOB120-3 Highway 547, Lakehurst, NJ 08733-5100. DoD activities may obtain copies of this standard from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 191 1 1-5094.

3、 The private sector and other Government agencies may purchase copies from the Aerospace Industries Association, 1250 Eye Street W, Washington, DC 20005. NASM1312-12 Should be used instead of MIL-STD-1312-12, which was cancelled on 29 August 1997. Custodians: Navy - AS Air Force - 1 1 Army - AV Prep

4、aring activity: Navy - AS project No. 53GP-0285-12) Review Activities: Navy - AS, SH Air Force - 1 1 Army - AV, AR DLA - IS COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES AS

5、SOCIATION OF AMERICq INC ALLRIGHTS RESERVED NASMl312-12 STANDARD PRACTICE FASTENER TEST METHODS METHOD 12 THICKNESS OF METALLIC COATINGS THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MIL-STD-1312-12 FSC 53GP SHEET 1 OF 10 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROS

6、PACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF lTEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATEN

7、T OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RIGHTS RESERVED NASM13 12-12 FOREWORD This standard sets forth a standar

8、d test procedure for determining the thickness of a metallic coating (plating) on threaded and nonthreaded fasteners, SHEET 2 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS

9、 PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licens

10、ed by Information Handling ServicesParagraph 1 . 1.1 2 . 2.1 2.1.1 3 . 4 . 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 4.2 4.2.1 4.2.2 4.2.3 5 . 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5 5.1.6 6 . 6.1 Figure 1 . 2 . NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICq INC

11、 ALL RIGHTS RESERVED NASM1312-12 TABLE OF CONTENTS sheet SCOPE . 4 Applicability . 4 REFERENCED DOCUMENTS . 4 Government documents . 4 Specifications. standards and handbooks . 4 DEFINITIONS . 4 GENERAL REQUIREMENTS . 4 Test apparatus . 4 Drop test method . 4 Magnetic test method (Magne-Gage or equi

12、valent) . 4 Eddy-current method . 5 Microscopic method . 5 Anodic dissolution method . 5 Strip and weigh method . 5 Test specimens . 5 Location of plate thickness measurement (externally threaded fasteners) . 5 Nuts . 5 Fasteners and fastener components of the hollow rivet type . 5 Dimensional chang

13、e method . 5 DETAIL REQUIREMENTS . 6 Drop test method . 6 Magnetic test method . 6 Eddy-current method . 6 Microscopic method . 6 Dimensional change method . 6 Strip and weigh method . 9 Test prures . 6 NOTES . 10 Test report . 10 FIGURES Externally threaded fasteners . 7 Hollow rivets and fastener

14、components . 8 SHEET 3 APPROVAL DATE AUGUST 1997 USE OF OR REUANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS . AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILIT

15、Y OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS . COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASS

16、OCIATION OF AMERICA MC ALL RIGHTS RESERVED NASM1312-12 1. SCOPE l. 1 Applicability. This test method outlines a standard procedure for determining the thickness of a metallic coating (plating) on threaded and nonthreaded fasteners. This procedure applies to all types of threaded and nonthreaded fast

17、eners and is not limited by configuration or size. 2. REFERENCED DOCUMENTS 2.1 Government documents. 2. l. 1 Specifications. standards and handbooks. Unless otherwise specified, the following specifications, standards and handbooks of the issue listed in the current Department of Defense Index of Sp

18、ecifications and Standards (DoDISS) and the supplement thereto (if applicable), form a part of this standard to the extent specified herein. STANDARDS FEDERAL FED-STD-H28/6 Screw Thread Standards for Federal Services, Section 6, Gages and Gaging for Unified Screw Threads FED-STD- 15 1 Metals, Test M

19、ethods (Copies of specifications, standards, handbooks, drawings and publications required by contractors in connection with specific acquisition fbnctions should be obtained fiom the contracting activity or as directed by the contracting officer.) 3. DEFINITIONS Not applicable. 4. GENERAL REQUIREME

20、NTS 4.1 Test apparatus. 4. l. 1 Drop test method. The apparatus shown in Figure of Method of FED-STD- 15 1 illustrates one method of applying the corroding medium. Other types of apparatus may be used if the drops are applied in conformance with Method of FED-STD-15 l. 4.1.2 Magnetic test method (Ma

21、gne-Gage or equivalent). Four different magnets and seven different calibration curves are used for various materials and thickness ranges. Table I of Method 522.1 of FED-STD-15 1, titled “Magnetic and calibration curves for use with the standard SHEET 4 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE

22、UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CWM RESPECTING (1) THE SUrrABILlTy OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR A

23、PPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC ALL RIGHTS RESERVED NASMl3 12-12 Magne-Gage, s

24、pecifies the proper combination of magnets and calibration curve to use for different coatings and thickness ranges. 4.1.3 Eddy-current method. Coating thickness shall be determined with an electromagnetic instrument that measures the changes in apparent impedance of the coil inducing the eddy curre

25、nts into the basis metal. The design of the instrument shall be such that variations in apparent impedance, produced by variations in coil to base metal spacing, can be calibrated to indicate the thickness of the coatings (see 5.1.3). 4.1.4 Microscopic method. Coating thickness shall be determined a

26、t a magnification of 400X or more, using a suitable metallographic microscope and a filar micrometer ocular, The ocular shall be calibrated to determine the value of the unit scale division against a scale so graduated that the error will not exceed 2.0 percent. An additional coating shall be applie

27、d to the specimen prior to mounting to support the metal coating and assure accurate readings of metal coating thickness. 4.1 .S Dimensional change method. Functional diameter-indicating type thread gages with gaging elements which in length approximate the width of the applicable Go thread ring gag

28、e, and which have been checked or set with master thread-setting plug gages conforming to FED-STD- H28/6 shall be used. 4.1.6 Anodic dissolution method. An electronic thickness tester (e.g., Kokour) and accessory equipment shall be used. 4.1.7 Strip and weight method. Coating thickness shall be dete

29、rmined, using a laboratory balance capable of reading to an accuracy of M.0001 grams, by the differential of the weights plated and unplated. 4.2 Test specimens. 4.2.1 Location of plate thickness measurement (externally threaded fasteners). The measurement of the thickness of coating shall be made a

30、t the locations shown on figure l. For fasteners having a body, the location of measurement shall be at a point adjacent to the thread runout area. For fasteners threaded to the head, the measurement shall be made on the head peripheral surface when the head configuration permits an accurate measure

31、ment determination, or on the thread pitch diameter at an approximate distance of 2D as measured fi-om the point end, or a distance of one-half the length of the fastener when the length is less than 4D. 4.2.2 Nuts. The plating thickness of nuts shall be determined on the bearing surface of the nut

32、at the mid-radius as shown on figure 2. 4.2.3 Fasteners and fastener components of the hollow rivet twe. The plating thickness on parts with a length to outside diameter ratio of less than 4 shall be measured on the exterior surface at a point midway between the ends of the part. For parts having a

33、length to outside diameter ratio of SHEET 5 APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CLAIM RESPECTI

34、NG (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. COPYRIGHT Aerospace Industries Association of America, Inc. (AIA/NAS)Licensed by Information Handling ServicesNATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AERO

35、SPACE INDUSTRIES ASSOClATlON OF AMERICA, MC ALL RIGHTS RESERVED NASM1312-12 4 or more, plating thickness shall be determined on the exterior surface at a location of one D from either end. Plating thickness locations for these parts are shown on figure 2. 5. DETAIL REQUIREMENTS 5.1 Test procedures.

36、When specified, tests for determining thickness of metallic coatings shall be performed in accordance with one of the following methods. The selection of method shall be at the option of the producer. The microscopic method (see 5.1.4) shall be used as the referee method. 5. l. 1 Drop test method. T

37、he procedure specified in Method of FED-STD-15 1, shall be followed, with the exception that the test solutions shall be in accordance with the applicable plating processing specification. The plating thickness shall be determined from a time- temperature plating thickness table shown in the applicable plating specification. 5.1.2 Magnetic test method. The procedure shall be performed in accordance with Method 522.1 ofFED-STD-151. 5.1.3 Eddy-current method. The procedure shall be performed in accordance with Method 520.1 of FED-STD- 1 5 l. 5