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Bolt and Screw Surface Discontinuities

Standards for surface discontinuities on fasteners establish limits and acceptance criteria for surface discontinuities on bolts, screws, studs, and nuts. Particular attention is paid to screw threading on high-strength fasteners intended for use under high pressures. Standards are available for both inch and metric series fasteners. This list for bolt and screw surface discontinutities includes standards from SAE, ASTM, and ISO.

ASTM F788-20

Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series

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, studs, and rivets 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, studs, or rivets, the purchaser shall specify conformance to ASTM Specification F788 , in the original inquiry and purchase order. 1.2.1 When the engineering requirements of the application necessitate that surface discontinuities on bolts, screws, studs, and rivets 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, or for rivets. 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. 1.5 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.

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SAE J 1061-2012 (SAE J1061-2012)

Surface Discontinuities on General Application Bolts, Screws, and Studs (Cancelled: Nov 2012)

This SAE Recommended Practice defines, illustrates, and specifies allowable limits for various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, and studs in sizes through 24 mm or 1 in diameter inclusive with lengths to 150 mm or 6 in inclusive, having specified minimum tensile strengths of 900 MPa or 120 000 psi and greater, which are primarily intended for use in automotive assemblies. The basic recommended practice does not include inspection sampling requirements. It is intended that the purchaser shall specify, in the original inquiry and purchase order, the inspection sampling requirements which the producer must satisfy to demonstrate the acceptability of bolts and screws with respect to surface discontinuities.

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SAE J 123-2012 (SAE J123-2012)

Surface Discontinuities on Bolts, Screws, and Studs in Fatigue Applications (Cancelled: Apr 2012)

This SAE recommended practice defines, illustrates, and specifies allowable limits for various types of surface discontinuities that may occur or become apparent during the manufacture and processing of bolts, screws, and studs which are primarily intended for use in automotive assemblies subjected to severe dynamic stresses and necessitating use of high strength fasteners having appropriate fatigue-resistant properties. The basic document does not include inspection sampling requirements. It is intended that the purchaser shall specify, in the original inquiry and purchase order, the inspection sampling requirements which the producer must satisfy to demonstrate the acceptability of bolts and screws with respect to surface discontinuities. Appendix A outlines inspection sampling plans applicable when such requirements are not specified by the purchaser in the original injury, purchase order, or in related specifications. When the provisions of this document are specified by the purchaser, the fastener manufacturer must significantly increase production controls including machine set up, blank diameters, die lubrication, in-process inspection requirements, and reduced production rate

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SAE AS 1177B-2018

Nondestructive Inspection Standards for Bolts and Screws

To establish the acceptance criteria of surface discontinuities of bolts and screws. This acceptance criteria establishes the location, number, size, depth, and type of surface discontinuities that are permitted on bolts and screws as revealed by visual, magnetic particle, or fluorescent penetrant inspection.

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ISO 6157-1:1988

Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for general requirements

Establishes limits for various types of products and applies also to these products with: nominal thread diameters of 5 mm and larger, product grades A und B, property classes up to and including 10.9; the annex contains a sampling plan.

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ISO 6157-3:1988

Fasteners - Surface discontinuities - Part 3: Bolts, screws and studs for special requirements

Establishes limits for various types of products and applies to these products with: nominal thread diameters of 5 mm and larger, product grades A and B, nominal lengths 1 10 d (or longer if specified), property class 12.9, and property classes 8.8, 9.8, and 10.9 (when specified or agreed); the annex contains a sampling plan.

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