A. ASTM F is for inch-based fasteners and ASTM FM is for metric fasteners, although the designations are identical between the two. The fastener industry should be made aware of an important recent development in the realm of. ASTM fastener standard specifications. ASTM F/. ASTM F/FM: Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric.
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All information presented is for general reference and does not represent a professional opinion nor asstm policy of an author’s employer. This standard does not purport to address all of the safety concerns, if any, associated with its use. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.
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.
Periodic inspections should be conducted according to a speci? 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. 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.
For internally threaded fasteners barrel-plating is generally suitable.
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. The barrel is designed to move the group of items, together, through each of the process steps, allowing ready ingress and egress of processing solutions and rinses. We do not specify specific plating specs; we simply use the general name. A number in parentheses indicates the year of last reapproval.
aatm The average current density is usually low enough such that the extremity-to-center coating thickness ratio is much lower than with barrel-plating. Measuring coating thickness on the threaded portion of a fastener is possible but impractical for in-process quality control veri?
When astmm areas are subject to minimum thickness requirements, the purchaser and the manufacturer shall recognize the necessity for either thicker deposits on other areas or special racking. 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.
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. My research is leading me to believe that ASTM F M both inch and metric are the f1941mm standards I need; but even those have over grades listed! Baking to relieve hydrogen embrittlement must be performed prior to the application of the chromate?
It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
Screw threads that are speci? The effect of thread damage is worse on heavy? Originally published as F — It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance. In some of the process steps, notably the electrocleaning and electroplating steps, an electric current is applied to the group of items.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Thank you for your assistance. That’s exactly what I needed. However the following restrictions apply: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the g1941m.
ASTM / ASME spec F for Zinc Plating Which finish to choose?
This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. The properties of the coatings shall conform to the ASTM standards for the individual? For example, rather than specifying: Diameter Din.
The extremities being the high current density areas receive the greatest coating thickness. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
It r1941m highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Eight hours is considered a typical example of baking duration. However, if not designated, signi? The other dimensional characteristics shall be as speci?
Asmt values from the two systems may result in non-conformance with the standard. The local coating thickness on a part is a result of the electrical current density at that location. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or zstm to date.
If the size of the fastener is large enough to economically use the rack-plating process, then the latter shall be used to obtain this thickness requirement. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. I am getting really confused in the finishing section. Refer to Appendix X3 for further information on effects of coating on pitch diameter, allowances and tolerances for external and internal threads.
Work Item s – proposed revisions of this standard. Thick or thin local thickness in a location other than a signi?