Tolerance Specification for Gear Hobs
ANSI/AGMA 1102-B13

This standard provides specifications for nomenclature, dimensions, tolerances, and inspection for gear hobs for modules 0.63 to 40 mm.  It establishes a basis for understanding the use and manufacture of these tools.

This standard applies to single and multiple-thread hobs for spur and helical gears.

This standard is not intended to completely define the hob tooth profile as it relates to the exact gear profile.  It is advisable to check gear tooth profile specifications with the hob manufacturer involved.  Examples include cutting depth and hob tooth profile modification as they affect gear tooth tip relief for fine-pitch and coarse-pitch hobs.

Where conditions require use of hobs of special design or specifications, such hobs shall be considered beyond the scope of this standard.

[The foreword, footnotes and annexes, if any, in this document are provided for informational purposes only and are not to be construed as a part of ANSI/AGMA Standard 1102-B13, Tolerance Specification for Gear Hobs.]

ANSI/AGMA 1102-A03 is a replacement of AGMA 120.01.  The first draft of AGMA 120.01 was prepared by the Cutting Tools Committee in May, 1972.  Its purpose was to consolidate all AGMA standards relating to hobs; i.e., AGMA 121.02, 122.02, 123.01 and 124.01.  The purpose of consolidating these standards was to provide the information as a handy updated reference on gear-cutting tools for efficient use by manufacturers and users of these tools.

The committee decided at the 1972 Semi-Annual Meeting to include Standard 124.01, Wormgear Hobs, as an Information Sheet.  AGMA 120.01 was approved by the Cutting Tools Committee on November 6, 1973.  It was approved by the AGMA Membership as of February 28, 1975.

ANSI/AGMA 1102-A03 is the result of a rewrite of AGMA 120.01, incorporation of the metric system, addition of inspection procedures, and development of equation based tolerances.  Other additions include increased tolerance grade levels, expansion of tolerances for multi-thread hobs, line of action testing, and expansion of the hob range of sizes.  ANSI/AGMA 1102-A03 was approved by the AGMA Membership on December 3, 2003.

ANSI/AGMA 1102-B13 is a revision of ANSI/AGMA 1102-A03.  The equations found in clause 6 were updated and reformatted for clarity.  In addition, tables were added to clause 6 to assist in the use of these equations.  The values in Table 8 were reviewed and updated accordingly.  ANSI/AGMA 1102-A03, Annex D was removed.

The first draft of ANSI/AGMA 1102-B13 was made in March, 2007.  It was approved by the AGMA membership in April 25, 2013.  It was approved as an American National Standard on April 8, 2013.

Suggestions for improvement of this standard will be welcome.  They may be submitted to

The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard.  At the time of publication, the editions indicated were valid.  All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

  • ANSI/AGMA 1012-G05, Gear Nomenclature, Definitions of Terms with Symbols
  • AGMA 915-3-A99, Inspection Practices - Gear Blanks, Shaft Center Distance and Parallelism
  • MIL-STD-105E, Sampling Procedures and Tables for Inspection by Attributes
The new standard is a revision of ANSI/AGMA 1102-A03. ISBN: 978-1-61481-086-5 Pages: 62
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