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ASTM A1073 - A 1073M - 14.pdf

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ASTM A1073 - A 1073M - 14.pdf

Designation A1073/A1073M − 14Standard Practice forUsing Hand Micrometers to Measure the Thickness ofNonmetallic and Metallic-Coated Steel Sheet1This standard is issued under the fixed designation A1073/A1073M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice defines procedures for measuring thethickness of nonmetallic and metallic-coated steel sheet.Thickness is a significant quality characteristic of steel sheetproducts. The ability to accurately measure thickness usinghand micrometers is critical in determining product confor-mance to specifications. The methods described are designedand intended for use in both laboratory and plant situations andtheir environments.1.2 The flat steel product shall conform to all the require-ments of the appropriate specifications as follows Specifica-tions A924/A924M and A917.1.3 Quantitative limits are not addressed and are establishedin the general requirements, or individual productspecifications, or both; or when applicable, as agreed tobetween supplier and user.1.4 This specification is applicable to orders in eitherinch-pound units or SI units. Values in inch-pound and SI unitsare not necessarily equivalent. Within the text, SI units areshown in brackets. Each system shall be used independently ofthe other.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards2A902 Terminology Relating to Metallic Coated Steel Prod-uctsA917 Specification for Steel Sheet, Coated by the Electro-lytic Process for Applications Requiring Designation ofthe Coating Mass on Each Surface General Require-mentsA924/A924M Specification for General Requirements forSteel Sheet, Metallic-Coated by the Hot-Dip Process3. Terminology3.1 DefinitionsSee Terminology A902 for definitions ofgeneral terminology relating to metallic-coated hot-dip prod-ucts.3.2 The definitions and procedures for measuring thicknesscharacteristics of steel sheet products are provided so thatpurchasers and suppliers have common definitions and mea-suring procedures for thickness measurements. The intentionof these definitions and measuring methods is not to providedimensional specifications for thickness characteristics, butrather common procedures for quantifying thickness values.For determining compliance with thickness specifications,references are provided to appropriate ASTM standards.4. Apparatus4.1 Micrometers used for thickness measurement shall beconstructed with anvils and spindles having minimum diam-eters of 0.188 in. [4.80 mm]. The tip of the anvil shall be flator rounded with a minimum radius of curvature of 0.10 in.[2.55 mm] and the tip of the spindle shall be flat. Micrometerswith conical tips, rounded anvil with rounded spindle, pointedtips or any surface that may penetrate the surface of the itembeing measured shall not be used for thickness measurementsof sheet steels. Micrometers can be electronic digital, mechani-cal digital, or analog with vernier scale, as shown in Fig. 1a,b, and c.4.2 Unlock the micrometer and if electronic digital, turn iton.4.3 Typical ways to hold/secure the micrometer are4.3.1 Grasp the micrometer as shown in Fig. 2, with thesmall finger placed in the frame of the micrometer for support.This allows the other hand to insert the sample for measuringafter cleaning see 4.4.4.3.2 Support the micrometer with a micrometer mount.This allows the other hand to insert the sample after cleaning1This practice is under the jurisdiction of ASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of SubcommitteeA05.07 on Methods of Testing.Current edition approved Jan. 1, 2014. Published January 2014. Originallyapproved in 2012. Last previous edition approved in 2012 as A1073/A1073M- 12.DOI10.1520/A1073_A1073M-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1see 4.4. Inserting the sample with one hand while lightlyclamping with the other hand, as shown in Fig. 3.4.4 Clean the micrometer tips at regular intervals. Placecleaning material, such as clean dry paper, lint free cloth,cardboard or fabric not abrasive such as sandpaper inbetween the anvil and spindle. Tighten the micrometer untillightly snug. Pull the cleaning material until free of themicrometer. Repeat until the micrometer is clean. Usually onceor twice is adequate.4.5 Close the micrometer by turning the friction thimble andzero out reset the micrometer in accordance with manufac-turer’s instructions. For mechanical vernier micrometers, ad-just the barrel to read zero in accordance with manufacturer’sinstructions, and as mechanical micrometers are sensitive tobarrel adjustments, recalibrate in accordance with the manu-facturer’s instructions.4.6 Measure material thickness by opening the micrometerwide enough so the sample can be placed between the anvil andspindle tip. Turn the friction thimble until there is no furthermovement of the spindle. Spin the friction thimble one furtherturn to secure the measurement. For electronic digitalmicrometers, read the viewing screen for the measurement.Follow the manufacturer’s instructions for mechanical mi-crometers with or without vernier micrometer scales.4.7 Repeat measurements as required. Note that the mi-crometer readings are subject to the precision of the type ofmicrometer used.4.8 Recording Readings4.8.1 If required on the sample, identify where the read-ings was made using a circle, box, cross hairs, etc.4.8.2 In the measurement record of readings, use a traceableidentification back to the sample or product that was measured.5. Calibration Checks5.1 It is common practice to calibrate micrometers on aregular basis in accordance with operational standards of eachcompany. The micrometers must be calibrated to appropriateElectronic Digital Mechanical Digital Analog with Vernier Scale1Anvil 2Spindle3Lock 4Thimble5Display 6Controls7Scale 8Vernier ScaleFIG. 1 Micrometer TypesFIG. 2 Holding a MicometerFIG. 3 Mounted MicrometerA1073/A1073M − 142NIST or equivalent standards within the prescribed time limits.The maximum length of time recommended between calibra-tions is one year.5.2 Zero out the micrometer.5.3 Measure at least three 3 different thicknesses so thatthe range of typical measurement is covered. Zero may be oneof the reference measurements. Use NIST or equivalent trace-able standards test blocks in increments of 0.050 in. that arewithin the thickness range of the product being measured.Example To measure thin sheet such as 0.048 in., use zero andtwo standards of 0.050000 in. [1.30 mm] and 0.100000 in.[2.54 mm]. Heavy thickness sheet such as 0.205 in., would use0.200000 in [5.08 mm], 0.250000 in. [6.35 mm], and 0.300000in. [7.60 mm]. If the micrometer readings of the standards testblocks are satisfactory, the device can be used to measuresheet steel with confidence.6. Proper Care of the Instrument6.1 Do not disassemble a digital micrometer.6.2 Store the micrometer at room temperature, typically 60to 100F [16 to 38C]. When measuring, let the micrometeracclimate to the ambient temperature of the sample. It is thenappropriate to set the micrometer at zero.6.3 Keep the micrometer clean and in a clean environment.6.4 Keep micrometer away from liquids of any kind.6.5 Do not subject the micrometer to sudden shocks such asfrom dropping, or to excessive force during measuring.6.6 Wipe off dust, cutting chips, oil, and moisture from themicrometer after each use.6.7 When cleaning the micrometer, use a soft cloth using aneutral detergent. Do not use any organic solvent thinner, etc.as it may cause damage to the device.6.8 Do not use an electric marking pen or other such deviceon the micrometer.7. Accuracy Statement37.1 Accuracy of Electronic Digital Micrometers is 6 0.0003in. [6 0.008 mm].7.2 Accuracy of Vernier Micrometers is 6 0.0004 in. [60.010 mm].7.3 The accuracy statement was determined through statis-tical examination of four studies from 31 laboratories on steelsamples and NIST traceable standards.NOTE 1The studies used micrometers with resolutions of 0.0001 in.[0.00254 mm] or finer.8. Keywords8.1 micrometer; steel sheet; steel sheet – metallic-coatedASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 phone, 610-832-9555 fax, or serviceastm.org e-mail; or through the ASTM websitewww.astm.org. Permission rights to photocopy the standard may also be secured from the ASTM website www.astm.org/COPYRIGHT/.3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RRA05-1005. ContactASTM CustomerService at serviceastm.org.A1073/A1073M − 143

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