The fastener industry should be made aware of an important recent development in the realm of. ASTM fastener standard specifications. ASTM F/. “ASME Hex Nut, 3/8 UNC-2B, SAE J Grade 5, ASTM F Zinc Coating ZN/FE Type 5B” we simply specify: “grade 5, zinc plated. ASTM F/FM: Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric.
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Ordering Information for Electroplating 5. Thick or thin local thickness in a location other than a signi? Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests.
It 1f941 that the external thread pitch diameter is at the maximum and that the internal thread pitch diameter is at the minimum of the tolerance f141 Fig. 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.
Screw threads that are speci? 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? A superscript epsilon e indicates an editorial change since the last revision or reapproval.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The extremities being the high current density areas receive the greatest coating thickness. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Diameter Din. That’s exactly what I needed. The properties of the coatings shall conform to the ASTM standards for the individual?
However, if not designated, signi? See Section 10 and Appendix X1. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
It should be noted that modi? The cascading action randomly exposes the surface of each individual piece to the process electrodes while also maintaining electrical continuity between all of the parts. In this process, quantities of an item are placed on a support, called a rack.
ASTM / ASME spec F for Zinc Plating Which finish to choose?
Refer to Appendix X1. 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.
This abstract is a brief summary of the referenced standard. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. All I want is a single spec to call out, to get the basic zinc-electroplated v1941. The local coating thickness on a part is a result of the electrical current density at that location.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Refer to Appendix X3 as a guideline for the tolerances of the various thread ashm and classes and the coating thickness they will accommodate.
It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Which finish to choose? The testing frequency should initially establish and subsequently verify over time, the ability of a process to produce parts that do not have the potential for hydrogen embrittlement. 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.
That standard should be consulted for more detailed information. 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. Eight hours is considered a typical example of baking duration. On an externally threaded fastener this occurs at the threaded tip. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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. 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. The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated. The coating must not cause the basic thread size to be transgressed by either asttm internal or external threads. Is there an acceptable way ff1941 demonstrate equivalence? The electrical continuity is maintained between the parts by the rack itself.
High current densities increase hydrogen charging. F — 00 Standard Speci?
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
The chromate finish letter E designates a black color. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
December 9, Q. In contrast, the center or recesses such as the bottom of the threads, which are the low current density areas, receive the lowest coating thickness. From beautiful Pine Beach New Jersey: Thank you for your assistance. This standard does not purport to address all of the safety concerns, if any, associated with its 1f941.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.