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  • BSI
    BS 949-4:1990, EN 22857:1989, ISO 2857:1973 Screwing taps - Specification for metric ground thread taps: manufacturing tolerances
    Edition: 1990
    $435.35
    / user per year

Description of BS 949-4:1990 1990

This International Standard specifies the manufacturing tolerances on the threaded portion of taps for producing the ISO metric threads of tolerance classes 4H to 8H and 4G to 6G as defined in ISO/R 965-I to III (excluding, consequently, classes 7G and 8G considered as usually produced with ground thread taps).

It is valid for the short taps specified in ISO/R 529 as well as for any other kind of ground thread taps with the same diameters and pitches.

The internal threads produced with those taps are conventionally designated by the simplified denomination of “nut” in agreement with the word used in ISO/R 965 for the general designation of all internal threads.

Annex A and Annex B give, for all threads with coarse and fine pitches, the manufacturing tolerances on the threaded position of taps for the following classes of nuts:

4H and 5H − 6H − 7H and 8H

and 4G and 5G − 6G


Manufacturing tolerances on the threaded portion of taps for producing ISO metric threads of tolerance classes 4H to 8H and 4G to 6G. Valid for short taps specified in ISO/R 529 as well as any other kind of ground thread taps with the same diameters and pitches.

Standard NumberBS 949-4:1990, EN 22857:1989, ISO 2857:1973
TitleScrewing taps - Specification for metric ground thread taps: manufacturing tolerances
StatusUnder Review
Publication Date1990-06-29
ReplacesBS 949-1:1976
Identical National Standard OfEN 22857:1989, ISO 2857:1973
DescriptorsThreading tools, Taps (threading), Hand tools, Thread pitch, Grades (quality), Marking, Dimensional tolerances, ISO metric threads, Dimensions, Cutting tools
ICS25.100.50 Taps and threading dies
CommitteeW/-
ISBN0 580 18629 6
PublisherBSI
Pages28

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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