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ASTM F1941M-07

(Specification)

Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)

Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)

ABSTRACT
This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: the coating metal deposit shall be bright or semibright, smooth, fine grained, adherent and uniform in appearance; the coating shall be free of blisters, pits, nodules, roughness, cracks, unplated areas, and other defects that will affect the function of the coating; and the coating shall not be stained, discolored or exhibit any evidence of white or red corrosion products. Slight discoloration that results from baking, drying, or electrode contact during rack-plating, or all of these, as well as slight staining that results from rinsing shall not be cause for rejection. Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests.
SCOPE
1.1 This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
1.2 The following precautionary statement pertains to the test method portion only, Section 9, of this specification:  This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
WITHDRAWN RATIONALE
This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in September 2015 and replaced by Specification F1941/F1941M on Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric.1

General Information

Status
Withdrawn
Publication Date
30-Nov-2007
ICS
21.060.01 - Fasteners in general
25.220.40 - Metallic coatings
Technical Committee
F16 - Fasteners
Drafting Committee
F16.03 - Coatings on Fasteners
Current Stage
Ref Project

Relations

Replaces
ASTM F1941M-05 - Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric]
Effective Date
01-Dec-2007
Replaced By
ASTM F1941/F1941M-16 - Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
Effective Date
19-Oct-2015

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ASTM F1941M-07 - Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)ASTM F1941M-07 - Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)
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ASTM F1941M-07 - Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric] (Withdrawn 2015)
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1941M −07
StandardSpecification for
1
Electrodeposited Coatings on Threaded Fasteners (Metric)
This standard is issued under the fixed designation F1941M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This specification covers the coating of steel metric screw threaded fasteners by electrodeposition.
The properties of the coatings shall conform to theASTM standards for the individual finishes listed.
Coating thickness values are based on the tolerances for M series metric threads having the
following tolerance positions: 6g and 4g6g for external threads, and 6H for internal threads. The
coating must not cause the basic thread size to be transgressed by either the internal or external
threads. The method of designating coated threads shall comply with ASME B1.13M.
With normal methods for depositing metallic coatings from aqueous solutions, there is a risk of
delayed failure due to hydrogen embrittlement for case hardened fasteners and fasteners having a
hardness 40 HRC or above.Although this risk can be managed by selecting raw materials suitable for
the application of electrodeposited coatings and by using modern methods of surface treatment and
post heat-treatment (baking), the risk of hydrogen embrittlement cannot be completely eliminated.
Therefore, the application of a metallic coating by electrodeposition is not recommended for such
fasteners.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers application, performance and 2.1 ASTM Standards:
dimensional requirements for electrodeposited coatings on B117Practice for Operating Salt Spray (Fog) Apparatus
threaded fasteners with metric screw threads. It specifies B487Test Method for Measurement of Metal and Oxide
coating thickness, supplementary hexavalent chromate or tri- Coating Thickness by Microscopical Examination of
valent chromite finishes, corrosion resistance, precautions for Cross Section
managing the risk of hydrogen embrittlement and hydrogen B499Test Method for Measurement of CoatingThicknesses
embrittlement relief for high-strength and surface-hardened by the Magnetic Method: Nonmagnetic Coatings on
fasteners. It also highlights the differences between barrel and Magnetic Basis Metals
rackplatingandmakesrecommendationsastotheapplicability B504Test Method for Measurement of Thickness of Metal-
of each process. lic Coatings by the Coulometric Method
B567Test Method for Measurement of Coating Thickness
1.2 The following precautionary statement pertains to the
by the Beta Backscatter Method
test method portion only, Section 9, of this specification:This
B568Test Method for Measurement of Coating Thickness
standard does not purport to address all of the safety concerns,
by X-Ray Spectrometry
if any, associated with its use. It is the responsibility of the user
B659Guide for Measuring Thickness of Metallic and Inor-
of this standard to establish appropriate safety and health
ganic Coatings
practices and determine the applicability of regulatory limita-
D6492Practice for Detection of Hexavalent Chromium On
tions prior to use.
Zinc and Zinc/Aluminum Alloy Coated Steel
E376 Practice for Measuring Coating Thickness by
1
This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.03 on Coatings on
2
Fasteners. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2007. Published January 2008. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2000. Last previous edition approved in 2005 as F1941M–05. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F1941M-07. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F1941M−07
NOTE 1—Black dot (•) indicates test surface.
FIG. 1Significant surfaces on Externally Threaded Fasteners
Magnetic-Field or Eddy-Current (Electromagnetic) Test-
ing Methods
F606Test Methods for Determining the Mechanical Proper-
NOTE 1—Black dot (•) indicates test surface.
ties of Externally and Internally Threaded Fasteners,
FIG. 2Significant surfaces on Internally Threaded Fasteners
Washers, Direct Tension Indicators, and Rivets
F1470Practice for Fastener Sampling for Specified Me-
chanical Properties and Performance Inspection
4. Classification
F1624Test Method for Measurement of Hydro
...

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This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with unified inch screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. The electrodeposited coating as ordered shall cover all surfaces and shall meet the requirements prescribed. Coated fasteners, when tested by continuous exposure to neutral salt spray shall show neither corrosion products of coatings (white corrosion) nor basis metal corrosion products (red rust) at the end of the test period. The coating thickness, embrittlement, corrosion resistance, and trivalent chromite finish shall be tested to meet the requirements prescribed.
SCOPE
1.1 This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with unified inch screw threads. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 The following precautionary statement pertains to the test method portion only, Section 9, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM F1941-00(2006)(Specification)
Standard Specification for Electrodeposited Coatings on Threaded Fasteners (Unified Inch Screw Threads (UN/UNR))

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1.1 This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with unified inch screw threads. It specifies coating thickness, supplementary chromate finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
The following precautionary statement pertains to the test method portion only, Section , of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM F1941M-05(Specification)
Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Metric]

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1.1 This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. It specifies coating thickness, supplementary chromate finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
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