【国外标准】 Standard Practice for Using Hand Calipers to Measure the Width of Steel Sheet

4.1 This practice provides procedures commonly used for measuring the width of steel sheet products under the jurisdiction of ASTM Committees A01 and A05 and their subcommittees as designated by a purchaser in a purchase order or contract when decimal, not fraction, tolerances are indicated.4.2 The ability to accurately measure width using hand calipers is critical in determining if product meets decimal specifications. The definitions and procedures for measuring width characteristics of steel sheet products are provided so that purchasers and suppliers have common definitions and measuring procedures for width measurements. The intention of these definitions and measuring methods is not to provide dimensional specifications for width characteristics, but rather common procedure(s) for quantifying width values. For determining compliance with width specifications, references are provided to appropriate ASTM standards.4.3 This practice may be used by other ASTM Committees and other standards writing bodies for the purpose of measuring the width of metal sheet products when decimal, not fraction, tolerances are indicated.1.1 This practice covers procedures for measuring the width of steel sheet when decimal, not fraction, tolerances are indicated. The methods described are designed and intended for use in the laboratory, mill situations, and general use.1.2 The flat steel product shall conform to all the requirements of the appropriate specifications as follows: Specifications A917 and A924/A924M.1.3 Quantitative limits are not addressed and are established in the general requirements, or individual product specifications, or both; or when applicable, as agreed to between supplier and user.1.4 Units—This specification is applicable to orders in either inch-pound units or SI units. Values in inch-pound and SI units are not necessarily equivalent. Within the text, SI units are shown in brackets. Each system shall be used independently of the other.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.