Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)

Is valid for the short taps specified in ISO 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 965 for the general designation of all internal threads.

Geschliffene Gewindebohrer für metrische ISO-Gewinde mit Toleranzfeld 4H bis 8H und 4G bis 6G für Regel- und Feingewinde - Festigungstoleranzen des Gewindeteiles (ISO 2857:1973 + A1:1984 + A2:1986)

Tarauds à filets rectifiés pour filetages métriques ISO de tolérance 4H à 8H et 4G à 6G à pas gros et à pas fins - Tolérances d'exécution de la partie taillée (ISO 2857:1973 + A1:1984 + A2:1986)

Ce rapport technique de type 2 décrit un profil des couches basses qui inclut la sous-couche MAC (accès au support), la sous-couche PLS (signalisation physique) et les MAU (unités de raccordement au secteur). Le présent profil utilise les techniques de modulation FSK, qui offrent l'avantage d'une mise en oeuvre bon marché, une robustesse et une résistance au bruit et aux interférences.

Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)

General Information

Status
Published
Publication Date
27-Sep-1989
Withdrawal Date
27-Mar-1990
ICS
25.100.50 - Taps and threading dies
Technical Committee
CEN/SS I09 - Small tools
Drafting Committee
CEN/SS I09 - Small tools
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
13-Oct-1999
Completion Date
13-Oct-1999
Ref Project
SIST EN 22857:2002 - Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)

Overview

EN 22857:1989 (Ground thread taps for ISO metric threads - manufacturing tolerances on the threaded portion) specifies manufacturing tolerances for the threaded portion of ground thread taps used to produce ISO metric internal threads. It covers taps for tolerance classes 4H to 8H and 4G to 6G, for both coarse and fine pitches. The standard is based on ISO 2857:1973 with subsequent amendments and applies to the short taps referenced in ISO 529 as well as other ground taps with the same diameters and pitches. Internal threads produced using these taps are conventionally designated as a “nut” in line with ISO 965 terminology.

Key Topics

  • Scope and applicability: Tolerances relate specifically to ground thread taps for ISO metric threads (coarse and fine pitches) and apply to short taps per ISO 529 and equivalent ground taps.
  • Manufacturing tolerances: Defines how the threaded portion of ground taps must be manufactured to guarantee the intended fit and interchangeability of the internal threads produced.
  • Thread tolerance classes: Focuses on taps that produce internal threads in tolerance fields 4H–8H and 4G–6G.
  • Terminology alignment: Uses conventional designations such as “nut” for internal threads consistent with ISO 965.
  • Conformance: Helps ensure taps manufactured to EN 22857 produce internal threads that meet metric screw thread standards for fit and fit-class expectations.

Applications

EN 22857 is practical for organizations and professionals involved in:

  • Tap manufacturers and toolmakers ensuring their ground thread taps meet repeatable manufacturing tolerances.
  • Quality assurance and metrology labs verifying tap geometry and compliance before release.
  • OEMs and component manufacturers specifying taps that must produce conforming metric internal threads.
  • Procurement and standards compliance teams including standards-based requirements in purchase specifications.
  • Design and mechanical engineering when selecting tolerances and fit classes for assemblies relying on tapped holes.

Using this standard helps achieve consistent threaded fits, improves interchangeability of components, and reduces assembly problems caused by nonconforming taps.

Related Standards

  • ISO 2857:1973 (+A1:1984, +A2:1986) - underlying ISO document on which EN 22857 is based.
  • ISO 529 - defines short taps referenced by the scope.
  • ISO 965 - general designation and tolerancing of internal threads (use of “nut” terminology).
  • National adoption example: SIST EN 22857:2002 (Slovenia).

Keywords: EN 22857:1989, ground thread taps, ISO metric threads, manufacturing tolerances, tap manufacturers, metric screw threads, thread tolerance classes.

Frequently Asked Questions

EN 22857:1989 is a standard published by the European Committee for Standardization (CEN). Its full title is "Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)". This standard covers: Is valid for the short taps specified in ISO 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 965 for the general designation of all internal threads.

Is valid for the short taps specified in ISO 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 965 for the general designation of all internal threads.

EN 22857:1989 is classified under the following ICS (International Classification for Standards) categories: 25.100.50 - Taps and threading dies. The ICS classification helps identify the subject area and facilitates finding related standards.

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Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A2:1986)Geschliffene Gewindebohrer für metrische ISO-Gewinde mit Toleranzfeld 4H bis 8H und 4G bis 6G für Regel- und Feingewinde - Festigungstoleranzen des Gewindeteiles (ISO 2857:1973 + A1:1984 + A2:1986)Tarauds a filets rectifiés pour filetages métriques ISO de tolérance 4H a 8H et 4G a 6G a pas gros et a pas fins - Tolérances d'exécution de la partie taillée (ISO 2857:1973 + A1:1984 + A2:1986)Ground thread taps for ISO metric threads of tolerances 4H to 8H and 4G to 6G coarse and fine pitches - Manufacturing tolerances on the threaded portion (ISO 2857:1973 + A1:1984 +A
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