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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Is there an acceptable way to demonstrate equivalence? However, if not designated, signi? It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. That standard should be consulted for more detailed information. The electrical continuity is maintained between the parts by the rack itself. Historical Version s – view previous versions of standard. Ordering Information for Electroplating 5.
ASTM F – Portland Bolt
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. The extremities being the high current density areas receive the greatest coating thickness. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. One of these should meet your needs.
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. Last previous edition F — Threaded Asmt, 3 0. 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.
This f1914 is accentuated with increasing length and decreasing diameter of the screw or bolt.
Thank you for your assistance. In some of the process steps, notably the electrocleaning and electroplating steps, an electric current is applied to the group of items. Which finish to choose? A number in parentheses indicates the year of last reapproval.
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 bakingthe risk of hydrogen embrittlement cannot be completely eliminated.
December 9, Q. It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance. To secure aetm of results, samples shall be aged at room temperature for 24 h before being subjected to the salt spray test.
It specifies coating ashm, 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. With normal methods for depositing metallic coatings from aqueous solutions, adtm is a risk of delayed failure due to hydrogen embrittlement for case hardened fasteners and fasteners having a hardness 40 HRC or above.
The appearance of corrosion products visible to the unaided eye at normal reading distance shall be cause for axtm, except when present at the edges of the tested fasteners.
Work Item s – proposed revisions of this standard.
ASTM / ASME spec F for Zinc Plating Which finish to choose?
Current edition approved Jan. 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.
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. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Toby — Thanks for boiling it down for me. All I want is a single spec to call out, to get the r1941 zinc-electroplated fastener. 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.
From beautiful Pine Beach New Jersey: It f19441 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 cascading action randomly exposes the surface of each f141 piece to the process electrodes while also maintaining electrical continuity between all of the parts. Test Method F is a recognized veri? In this process, quantities of an item are placed on a support, called a rack. It should be noted that modi?
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
The values given in parentheses are for information only. 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 can 6 damage the external threads of fasteners. See Section 10 and Appendix X1. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: For example, rather than specifying: F — 00 Standard Speci?
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 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. 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. Refer to Appendix X3 as a guideline for the tolerances of the various thread sizes and classes and the coating thickness they will accommodate. The effect of thread damage is worse on heavy? However the following restrictions apply: