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  • BSI
    20/30423719 DC BS ISO 965-4. ISO general purpose metric screw threads. Tolerances - Part 4. Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing
    Edition: 2020
    $42.22
    / user per year

Description of 20/30423719 DC 2020

This part of document specifies limit deviations and limits of sizes for the pitch and crest diameters of the hot-dip galvanized metric external screw threads conforming to the coarse thread series of ISO 262 (from M10 to M64) having a basic profile according to ISO 68-1.

This part of document is applicable to the hot-dip galvanized metric external screw threads to mate with the internal screw threads tapped with tolerance position H or G after galvanizing.

Products made with thread tolerances in accordance with ISO 965-4 may show failure at lower ultimate tensile loads than those specified in ISO 898-1 due to reduction of the stress area.

External screw threads with thread tolerances according to ISO 965-4 must not be mated with internal screw threads with thread tolerances according to ISO 965-5 because such combinations will create severe risk for thread stripping.

NOTE

After the hot-dip galvanization the external threaded products with the tolerance class 6az shall be centrifuged immediately.



Standard Number20/30423719 DC
TitleBS ISO 965-4. ISO general purpose metric screw threads. Tolerances - Part 4. Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing
StatusDefinitive
Publication Date2020-09-22
Identical National Standard OfISO/DIS 965-4
DescriptorsStandard deviation, Threaded fasteners, Dimensions, Dimensional tolerances, Size, Thread forms, Hot-dip galvanizing, Length, External threads, Diameter, Thread pitch, Metal coatings, Threads, ISO metric threads, Radius
ICS21.040.10 Metric screw threads
CommitteeFME/9
PublisherBSI
Pages10

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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