1、NASM 1312-12-2002 Fastener Test Methods - Method 12_ STD.AIA/NAS NASML322-L2-ENGL L997 = 0338743 0505402 252 W 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
2、 OD). Proposed changes by DoD activities must be submitted to 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
3、 Robbins Avenue, Building 4D, Philadelphia, PA 191 1 1-5094. The private sector and other Government agencies may purchase copies from the Aerospace Industries Association, 1250 Eye Street NW, Washington, DC 20005. NASM1312-12 Should be used instead of MIL-STD-1312-12, which was cancelled on 29 Augu
4、st 1997. Custodians: Navy - AS Air Force - 11 Army - AV Preparing activity: Navy - AS project No. 53GP-0285-12) Review Activities: Navy - AS, SH Air Force - 11 Army - AV, AR DLA - IS NATIONAL AEROSPACE STANDARD COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, iNC. AURIGHTS RESERVED NO. RE
5、V. NO. 1 1 7 NASM13 12-1 2 STANDARD PRACTICE REV. NEW FASTENER TEST METHODS METHOD 12 THICKNESS OF METALLIC COATINGS Aerospace Industries Association THE INITIAL RELEASE OF THIS DOCUMENT SUPERSEDES MIL-STD-1312-12 DESIGNATION FOR THIS STANDARD REMAINS MIL-STD-1312-12 n 5 1 11 NEW 6 1 FSC53GP SHEET 1
6、 OF 11 REVISION 1 April 2002 Q APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE WON THIS DOCUMENT OR ANY NATIONAL OSPACE 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) T
7、HE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. -,-,-NATIONAL AEROSPACE STANDARD COPYRIGHT 1997 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, INC AU RiGHTS RESERVED NASM 1 3 1 2- 1 2 FOREWORD This standard sets for
8、th a standard test procedure for determining the thickness of a metallic coating (plating) on threaded and nonthreaded fasteners. 2 APPROVAL DATE AUGUST 1997 REVISION USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL AEROSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERT
9、IFY CONFORMANCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS. AIA MAKES NO REPRESENTATION OR CWM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. -,-,-P ara mau h 1 . 1.1 2 . 2.1 3 . 4 . 4.1 4.1.1 4.
10、1.2 4.1.3 4.1.4 :i:; 8 2; 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 6.1 Fime 1 . 2 . NATIONAL AEROSPACE STANDARD COPYRIGHT 2002 AEROSPACE INDUSTNES ASSOCIATION OF AMERICA, INC . ALL RIGHTS RESERVED NASM1312-12 TABLE OF CONTENTS Sheet SCOPE . 4 Applicability . 4 REFERENCED DOCUMENTS . 4 G
11、overnment documents . 4 Specifications, standards and handbooks . 4 Other publications . 4 DEFINITIONS . 5 GENERAL REQUIREMENTS . 5 Drop test method . 5 Test apparatus . 5 Magnetic test method (Magne-Gage or equivalent) . 5 Eddy-current method . 5 Microscopic method . 5 Dimensional change method . 6
12、 Coulumetric method . 6 Strip and weigh method . 6 Beta Backscatter method . 6 X-ray method . 6 Test specimens . 6 Location of plate thickness measurement (externally threaded fasteners). . 6 Nuts . 6 Fasteners and fastener components of the hollow rivet type . 6 DETAIL REQUIREMENTS . 9 Test procedu
13、res . 9 Drop test method . 9 Magnetic test method . 9 Eddy-current method . 9 Microscopic method. . 9 Dimensional change method . 9 Codmetric method . 10 Strip and weigh method . 10 Beta Backscatter method., . 11 X-Ray spectrometry method . 11 Expression of significant digits . 11 NOTES . 11 Test re
14、port . 11 FIGURES Sheet Externally threaded fasteners . 7 Hollow rivets and fastener components . 8 SHEET 3 REVISION 1 April 2002 Q APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL OSPACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMA
15、NCE OF ITEMS PRODUCED UNDER AEROSPACE STANDARDS . AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE ESISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS . -,-,-,-,-NATIONAL AEROSPACE STANDARD COPYRIGHT 2002 AEROSPACE
16、 INDUSTRIES ASSOCIATION OF AMERICA, MC ALL RIGHTS RESERVED 13 1 2 1. SCOPE 1.1 Auulicabilitv. 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 nonthr
17、eaded fasteners and is not limited by configuration or size. 2. REFERENCED DOCUMENTS 2.1 Government documents. 2.1.1 Suecifications. standards and handbooks. Unless otherwise specified, the following specifications, standards and handbooks of the issue listed in the current Department of Defense ind
18、ex of Specifications and Standards (DoDISS) and the supplement thereto (if applicable), fonn 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 (Copies of specifica
19、tions, standards, handbooks, drawings and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer .) 0 2.2 Other publications. The following docuinent(s) forms a part of this spe
20、cification to the extent specified herein. The issues of the documents which are indicated as DOD adopted shall be the issue in the current DoDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR TESTING AND MATERTALS (ASTM) ASTM B 487 ASTM B 499 ASTM B 504 ASTM B 530 ASTM B 555 ASTM
21、B 567 ASTM B 568 Test Method for Measurement of Metal and Oxide Coating Thicknesses by Microscopic Examination of a Cross Section Measurement of Coating Thicknesses by the Magnetic Method Measurement of Thickness of Metallic Coatings by the Coiilumetric Method Measurement of Coating Thicknesses by t
22、he Magnetic Method: Electrodeposited Nickel Coatings on Magnetic and Nomnagnetic Substrates Measurement of Electrodeposited Metallic Coating Thicknesses by the Dropping Test Measurement of Coating Thickness by the Beta Backscatter Method Measurement of Coating Thicknesses by X-Ray Spectrometry SHEET
23、 4 REVISION 1 April 2002 Q APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL OSPACE 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
24、SUITABILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. -,-,-NATIONAL AEROSPACE STANDARD COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA, JNC. ALL RIGHTS RESERVED NASM1312-12 AMERICAN SOCIETY FOR TESTING AND MATER
25、IALS (ASTM) (Continued) ASTM B 767 ASTM E 29 ASTM E 376 Determining Mass Per Unit Area of Electrodeposited and Related Coatings by Gravimetric and Other Chemical Analysis Procedures Practice for Using Sigiiificant Digits in Test Data to Determine Conformance with Specifications Measuring Coating Thi
26、ckness by Magnetic-Field or Eddy-Current (Electromagnetic) Test Methods 3. DEFINITIONS Not applicable. 4. GENERAL REQUIREMENTS 4.1 Test auparatus. . Vi.id n “ILYU n VLY cTn ii LJL determined by applying a corrosive solution, dropwise, at a constant rate, and measuring the time required to penetrate
27、the coating and expose the parent material. The apparatus shown in Figure 1 of ASTM B 555 illustrates one method of applying the corroding medium. Other types of apparatus may be used if the drops are applied in conformance with ASTM B 555 (see 5.1.1). o 4.1.2 2 Sy-J 151 tt 4.1.2 Mametic test method
28、. This test method covers the use of magnetic instniments for the non- destructive measurement of the coating thickness. Coating thickness shall be determined by measuring either the magnetic attraction between a magnet and the coating-substrate combination, or the reluctance of a magnetic flux path
29、 passing through the coating and the base metal (see 5.1.2). 4.1.3 Eddv-current method. Coating thickness shall be determined with an electromagnetic instrument that measures the changes in apparent impedance of the coil inducing the eddy currents into the basis metal. The design of the instrument s
30、hall 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 at a magnification of 400X or more, using a suitable meta
31、llographic 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. Ai additional coating shall be applied to the specimen prior to mounting to support the metal
32、 coating and assure accurate readings of metal coating thickness. SHEET 5 REVISION 1 A ri1 2002 QF APPROVAL DATE AUGUST 1997 USE OF OR RELIANCE UPON THIS DOCUMENT OR ANY NATIONAL. OS ACE STANDARD IS ENTIRELY VOLUNTARY AIA DOES NOT QUALIFY SUPPLIERS OR CERTIFY CONFORMANCE OF ITEMS PRODUCED UNDER AERO
33、SPACE STANDARDS, AIA MAKES NO REPRESENTATION OR CLAIM RESPECTING (1) THE SUITAE3ILITY OF ITEMS FOR ANY PARTICULAR APPLICATION OR (2) THE EXISTENCE OF OR APPLICABILITY THERETO OF PATENT OR TRADEMARK RIGHTS. -,-,-,-,-NATIONAL AEROSPACE STANDARD COPYRIGHT 2002 AEROSPACE INDUSTRIES ASSOCIATION OF AMERIC
34、A, INC. ALL RIGHTS RESERVED NASM13 12-12 4.1.5 Dimensional change method. Functional diameter-indicating type thread gages with gaging elements which in length approximate the width of the applicable “Go” thread ring gage, and which have been checked or set with master thread-setting plug gages conf
35、orming to FED-STD-H28/6 shall be used. . . -Ad. !-WG” .S., KY 4.1.6 Coulumetric method. Coating thickness shall be determined by measuring the quantity of electricis (Coulombs) required to dissolve the coating anodically from a known and accurately defined area. This method is also known as the anod
36、ic solution, anodic dissolution, or electrochemical stripping method. 4.1.7 Strip and weight method. Coating thickness shall be determined, using a laboratory balance capable of reading to an accuracy of IO.0001 grams, by the differential of the weights plated and unplated. 4.1.8 Beta Backscatter me
37、thod. Beta Backscatter equipment shall include a radiation source emitting primarily beta particles and a detection system. 4.1.9 X-Rav method. X-Ray spectrometry equipment which includes an X-Ray source and detection system shall be used. 4.2 Test suecimens. o 4.2.1 Location of plate thickness meas
38、urement (externally threaded fasteners). The measurement of the thickness of coating shall be made at the locatioiis shown on Figure 1. For fasteners having a body, the location of measurement shall be at a point adjacent to the thread runout area. If the configuration of the fastener does not provide enough room on the body for an accurate measurement, the measurement may be taken on the head peripheral surface when the hea
