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ASTM F788/F788M-2008 英制及公制系列的螺栓、螺钉及螺柱的表面不均匀性的标准规范

ASTM F788/F788M-2008 英制及公制系列的螺栓、螺钉及螺柱的表面不均匀性的标准规范

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【英文标准名称】: Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
【原文标准名称】: 英制及公制系列的螺栓、螺钉及螺柱的表面不均匀性的标准规范
【标准号】: ASTM F788/F788M-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: F16.93
【标准类型】: (Specification)
【标准水平】: ()
【中文主题词】:
【英文主题词】: bolts; crack; discontinuities (surface); fold; screw (machine, sems, tapping); seam; studs; thread lap; void; Bolting materials; Discontinuities--fasteners; Fasteners (metal)--specifications; Screws--specifications; Stainless steel screws--specifications;
【摘要】: 1.1 This specification establishes allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, and studs, including heat-treated machine screws, tapping screws, and sems (the washers of screw-washer assemblies are excluded). This specification covers metric series products with nominal diameters of 4 mm and larger and with specified minimum tensile strengths of 420 MPa and higher; and inch series products with nominal diameters of No. 5 (0.1250 in.) and larger and with specified minimum tensile strengths of 60 000 psi and higher. 1.2 When the engineering requirements of the application necessitate control of surface discontinuities on bolts, screws, or studs, the purchaser shall specify conformance to ASTM Specification F 788/F 788M, in the original inquiry and purchase order. 1.2.1 When the engineering requirements of the application necessitate that surface discontinuities on bolts, screws, and studs be controlled within limits closer than those specified in this specification, the purchaser shall specify the applicable limits in the original inquiry and purchase order. 1.3 The allowable limits established in this specification for metric bolts, screws, and studs with nominal diameters from 4 to 24 mm inclusive, are essentially identical with requirements given in ISO 6157/I. There are no ISO standards for surface discontinuities on any inch-series products. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
【中国标准分类号】: J13
【国际标准分类号】: 21_060_10
【页数】: 6P.;A4
【正文语种】: 英语

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