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.
|Published (Last):||6 April 2009|
|PDF File Size:||17.13 Mb|
|ePub File Size:||13.23 Mb|
|Price:||Free* [*Free Regsitration Required]|
This standard does not purport to address all of the safety concerns, if any, associated with its use. Refer to Appendix X1. Threaded Tip, 3 0. This standard does not astn to address all of the safety concerns, if any, associated with its use. 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.
The testing frequency should initially establish and subsequently verify over time, the ability of a process to produce parts that do not have the f1941j for hydrogen embrittlement. Nonmagnetic Coatings on Magnetic Basis Metals. Awtm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
A number in parentheses indicates the year of last reapproval. Link to Active This link will always route to the current Active version of the standard.
It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Eight hours is considered a typical example of baking duration.
Long screws and bolts have a length-to-diameter ratio greater than 5 but less than December 9, Q. The external thread damage is also minimized in comparison to barrel-plating due to the absence of tumbling. Diameter Din. On an externally threaded fastener this occurs at the threaded tip.
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
ASTM does not give any warranty express or implied or make any representation that the contents of g1941m abstract are accurate, complete or up to date. Link to Active This link will always route to the current Active version of the standard. 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 appearance of corrosion aztm visible to the unaided eye at normal reading distance shall be cause for rejection, except when present at the edges of the tested fasteners. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Historical Version s – view previous versions of standard. In this process, quantities of an item are placed within a containment vessel, called a barrel. Ordering Information for Electroplating 5. The extremities being the high current density areas receive the greatest coating thickness. Changing the last letter to a B means that the chromate is blue-bright transparent with a bluish tinge and slight Iridescence or C means that it ast yellow yellow iridescent.
It specifies coating thickness, supplementary f19411m 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.
ASTM F – Portland Bolt
It is the responsibility of the user of this standard to establish f194m1 safety and health practices and determine the applicability of regulatory limitations prior to use. Toby — Thanks for boiling it down for me. 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. The test methods for determining the coating thickness are de?
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.
This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of f1914m of such rights, are entirely their own responsibility.
One of aetm should meet your needs. That standard should be consulted for more detailed information. This can 6 damage the external threads of fasteners. Test Method F is a recognized veri? Thickness Designation 3 5 8 12 Minimum Thickness in. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
We do not sstm specific plating specs; we simply use the general name. The rack is designed to move the group of items, together, through each of the process ast, allowing ready ingress and egress of processing solutions and rinses.
ASTM / ASME spec F for Zinc Plating Which finish to choose?
Combining values from the two systems may result in non-conformance with the standard. For example, rather than specifying: Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: Refer to Appendix X3 as a guideline for the tolerances of the various thread sizes and classes and the coating thickness they will accommodate.
My company uses fasteners in the most simple sense–like the kind of fasteners you buy in the bulk bin at the local hardware qstm. Refer to Annex A1 for neutral salt spray performance requirements for zinc, zinc alloy and astmm coatings.
As the barrel f1941n moved through the process steps, it is also rotated such that the individual items are constantly cascading over one another. For this reason the control mechanism speci?
The other dimensional characteristics shall be as 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.
Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate? 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. Is there an acceptable way to demonstrate equivalence?