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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Thickness Designation 3 5 8 12 Minimum Thickness in. Test Method F is a recognized veri? Refer to Appendix X3 as a guideline for the tolerances of the various thread sizes and classes and the coating thickness they will accommodate. A number in parentheses indicates the year of last reapproval.
On an externally threaded fastener this occurs at the threaded tip.
As the barrel is moved through the process steps, it is also rotated such that the individual items are constantly cascading over one another.
The local coating thickness on a part is a result of the electrical current density at that location. NOTE 1—Fasteners with a speci?
That’s exactly what I needed. Work Item s – proposed revisions of this standard. Users of this standard are axtm advised that determination of astj validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Which finish to choose? Nonmagnetic Coatings on Magnetic Basis Metals. One of these should meet your needs. See Section 10 and Appendix X1. The external thread damage is also minimized in comparison to barrel-plating due to the absence of tumbling.
ASTM F – Portland Bolt
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. For example, rather than asrm Historical Version s – view previous versions of standard. The test plan should be designed based upon the speci?
December 9, Q. We do not specify specific plating specs; we simply use the general name. It specifies coating astmm, 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 test methods for determining the coating thickness are de? This can 6 damage the external threads of fasteners.
This applies to the following cases: It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance. That standard should be consulted for more detailed information. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the ast of regulatory limitations prior to use.
My follow adtm 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? The electrodeposited coating shall cover all surfaces and shall meet the following requirements: However, if not designated, signi?
With normal methods for depositing metallic coatings from aqueous solutions, there is a risk of delayed failure due to hydrogen embrittlement for case asm fasteners and fasteners having a hardness 40 HRC or above. 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.