ASTM_A_1087_-_A_1087M_-_16.pdf

Designation:A1087/A1087M16Standard Practice forUsing Hand Calipers to Measure the Width of Steel Sheet1This standard is issued under the fixed designation A1087/A1087M;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.Scope*1.1 This practice defines procedures for measuring thewidth of steel sheet when decimal,not fraction tolerances areindicated.The ability to accurately measure width using handcalipers is critical in determining if product meets decimalspecifications.The methods described are designed and in-tended for use in the laboratory,mill situations,and generaluse.1.2 The flat steel product shall conform to all the require-ments of the appropriate specifications as follows:Specifica-tions A917 and A924/A924M.1.3 Quantitative limits are not addressed and are establishedinthegeneralrequirements,orindividualproductspecifications,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 Standards:2A902 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-ments)A924/A924M Specification for General Requirements forSteel Sheet,Metallic-Coated by the Hot-Dip Process3.Terminology3.1 Definitions:See Terminology A902 for definitions ofgeneral terminology.3.2 The definitions and procedures for measuring widthcharacteristics of steel sheet products are provided so thatpurchasers and suppliers have common definitions and mea-suring procedures for width measurements.The intention ofthese definitions and measuring methods is not to providedimensional specifications for width characteristics,but rathercommon procedure(s)for quantifying width values.For deter-mining compliance with width specifications,references areprovided to appropriate ASTM standards.4.Apparatus4.1 Calipers used for width measurement shall be con-structed with parallel blades so the sheet can be placed betweenthem for measurement.The outside blades of a caliper are usedto measure the width of steel sheet;inside blades of a caliperare used to measure internal dimensions of non-sheet products.Calipers can be electrical digital,dial or analog with vernierscale,as shown in the photographs.See Fig.1 and Fig.2.4.2 Unlock the caliper and if electrical digital,turn it on.4.3 Clean caliper blades prior to use.Place cleaningmaterial,such as clean dry paper,lint-free cloth,or fabric(notabrasive such as sandpaper)on the outside blades and wipeclean.Repeat until the caliper is clean.Usually once or twiceis adequate.4.4 The typical method to hold or secure the caliper is tograsp the caliper,as shown in Fig.3,with right hand and thesheet in left hand.4.5 Close the caliper by rotating the thumb wheel or slidingthe movable blade toward the fixed blade.The caliper isacceptable for use if it reads zero.If not,for electronic digitalcalipers,zero out(reset)the caliper per manufacturers instruc-tions.For dial and vernier calipers,adjust them to read zero permanufacturers instructions.NOTE1Mechanical calipers are sensitive to use and adjusting,1This test method is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.07 on Methods of Testing.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 2013.Last previous edition approved in 2013 as A1087/A1087M-13.DOI:10.1520/A1087_A1087M-16.2For 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 standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 recalibrate per manufacturers instructions.4.6 Measure the material width by holding the caliper withthe right hand and sheet with the left hand.Open the caliperblades large enough so the sheet can be placed between theblades.Place the sheet fully within the outside blades and thentighten the outside blades until contact is m