Surface Temper Etch Inspection After Grinding [Same as New ISO 14104]
ANSI/AGMA 2007-C00 (reaffirmed August 2013)
ANSI/AGMA 2007-C00 (reaffirmed August 2013)

This standard specifies standard procedures and requirements for the detection and classification of localized overheating on ground surfaces by chemical etch methods.

Some methods which have been used in the past are no longer recommended. Specifications should be changed to use the methods in this standard. These etching methods are more sensitive to changes in surface hardness than most hardness testing methods.

This standard applies to steel parts, such as gears, shafts, splines and bearings, but is not applicable to nitrided parts and stainless steels.

NOTE: This process, although at times called “nital etch”, should not be confused with other processes also known as "“nital etch”".

The surface temper etch procedure is to be performed after grinding and before additional finishing operations.

[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 2007--C00, Gears -- Surface Temper Etch Inspection After Grinding.]

AGMA 230.01 was written to standardize a process of surface temper inspection.

An industry wide survey conducted by the committee indicated a wide variation in solution strengths and times used, which gave rise to that standard. The safety and environmental precautions included therein were a caution for those not familiar with the storage, handling, use and disposal of concentrated acids, alkalis and solvents. Those precautions, however, did not supersede the latest OSHA, EPA, and DOT requirements. The solutions and times stated therein work and were acceptable to the greatest number of users.

The safety precautions no doubt are superfluous to many. However, due to the difference of this inspection from ordinary shop practice, it is felt that some caution should be directed to those manufacturers without benefit of personnel trained in the proper use and handling of these materials.

The first committee draft of AGMA 230.01 was prepared in September, 1963. It was approved by the Surface Temper Inspection Process Task Committee as of September, 1964. AGMA 230.01 was approved by the AGMA membership as of April 13, 1967.

The revision of AGMA 230.01, designated ANSI/AGMA 2007--B92, was begun in May 1989. It was renamed Surface Temper Etch Inspection After Grinding, for better definition, the contents reorganized, and obsolete procedures deleted. Type 1 (hot bleach) Etching was published in AGMA 230.01 as table 2A in an appendix. This table was not included in the revision; the use of Type 2 or Type 3 Etching was recommended instead.

Another specification covering temper etch inspection is MIL--STD--867A, Temper Etch Inspection.

ANSI/AGMA 2007--B92 was adopted as an International Standard (ISO 14104:1995) through ISO’s "“fast track procedures"”, by Technical Committee TC 60 Gears.

This ANSI standard, designated ANSI/AGMA 2007--C00, is an identical adoption of ISO 14104:1995. The differences between it and ANSI/AGMA 2007--B92 are:

  • The Scope is modified to delete the statement that the standard applies to steel parts “"40 HRC or greater"”. In addition, the stipulation that the procedure is to be performed after grinding and before additional finishing operations is made.
  • Clause 2 in ANSI/AGMA 2007--B92, “"Requests, approval and certification"” is located in clause 10, “"Specifications and documentation"” in this standard. The requirement "“When this standard is referenced, materials, equipment and processes, as listed herein, shall be used”" is deleted.
  • In the last paragraph of sub--clause 4.2, “"Etching"”, a recommended time for elevated temperature bake is indicated.
  • In table 3, “"Type 3 etching"”, the recommended time for step 4, nitric acid etch, in alcohol, is 1.5 to 3.5 minutes, instead of 1.5 to 2.5 minutes.
  • Sub--clause 5.1 contains an additional paragraph, recommending that users of the standard set their own reference standards.
  • Clause 9, Safety and environmental precautions, is revised to delete reference to specific U.S. regulatory agencies.
  • The standard is metric only.
  • Minimal editorial changes have been incorporated.

The first draft of ANSI/AGMA 2007--C00 was made in August, 1998. It was approved by the AGMA membership on March 2, 2000. It was approved as an American National Standard on November 2, 2000.

Suggestions for improvement of this standard will be welcome. They should be sent to the American Gear Manufacturers Association, 1500 King Street, Suite 201, Alexandria, Virginia 22314.

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