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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My research is leading me to believe that ASTM F M both inch and metric are the two standards I need; but even those have over grades listed! The test plan should be designed based f19411m the speci? The test methods for determining the coating thickness are de?
My follow up question would be, if the fasteners are coated with trivalent chromite adding the designation “T”why do the salt spray hours in the ASTM spec differ between any color chromate designation?
This standard does not purport to address all of the safety concerns, if any, associated with its use. Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners.
It specifies coating thickness, supplementary hexavalent chromate or non-hexavalent conversion coatings, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners. The asym thread damage is also minimized in comparison to barrel-plating due to the absence of tumbling.
Current edition approved Jan. 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Thickness Designation 3 5 8 12 Minimum Thickness in.
My company uses fasteners in the most simple sense–like the kind of fasteners you buy in the bulk bin at the local hardware store. Refer to Appendix X3 for further atsm on effects of coating on pitch diameter, allowances and tolerances for external and internal threads.
High current densities increase hydrogen charging. It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. This standard does not purport to address all of the safety concerns, if any, associated with its use.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Toby — Thanks for boiling it down for astk. When such 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.
For this reason the control mechanism speci? 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 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.
Refer to Appendix X1. In some of the process steps, notably the electrocleaning and electroplating steps, an electric current is applied to the group of items.
Thank you for your assistance. A number in parentheses f1914m the year of last reapproval. 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.
ASTM F – Portland Bolt
Historical Version s – view previous versions of standard. Work Item s – proposed revisions of this standard. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Measuring coating thickness on the threaded portion of a fastener is possible but impractical for in-process quality control veri? On an externally threaded fastener this occurs at the threaded tip. If f11941m feel that your comments have not received a fair hearing you should make your views known to the Axtm Committee on Standards, at the address shown below. See Section 10 and Appendix X1.
Threaded Tip, 3 0. The asttm of corrosion products visible to the unaided eye at normal reading distance shall be cause for rejection, except when present at the edges of the tested fasteners. Baking to relieve hydrogen embrittlement must be performed prior to the application of wstm chromate?
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.
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
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. One of these should meet your needs. The coating must not cause the basic thread size to be transgressed by either the f19941m or external threads.
It assumes that the external thread pitch diameter is at the maximum and that the internal thread pitch diameter is at the minimum of the tolerance see Fig. The average current density is usually low enough such that the extremity-to-center coating thickness ratio is much lower than with barrel-plating.
It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. The external thread allowance may thus be used to accommodate the coating thickness on threaded fasteners, provided the maximum coating thickness is no more than 1?
Refer to Annex A1 for neutral salt spray performance requirements for zinc, zinc alloy and cadmium coatings.
The rack 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. Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate?
Test Method F is a recognized veri? From beautiful Pine Beach New Jersey: It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests.