ASTM F788 STANDARD SPECIFICATION FOR SURFACE DISCONTINUITIES OF BOLTS, SCREWS, AND STUDS, INCH AND METRIC SERIES
Revision Edition 08 Chg: Date: 11/01/08 ASTM F788
This ASTM F788 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 ASTM F788 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, ASTM F788.
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, in the original inquiry and purchase order
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.
The allowable limits established in this ASTM F788 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. ASTM F788, There are no ISO standards for surface discontinuities on any inch-series products.
The values stated in either SI units or inch-pound units are to be regarded separately as standard. ASTM F788, 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.
*A Summary of Changes section appears at the end of this ASTM F788 standard