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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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.
That standard should be consulted for more detailed information. 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.
ASTM F – Portland Bolt
This can 6 damage the external threads of fasteners. 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!
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.
High current densities increase hydrogen charging. 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. 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.
Ordering Information for Electroplating 5. In this process, quantities of an item are placed on a support, called a rack.
The appearance of corrosion products visible to the unaided f9141 at normal reading distance shall be cause for rejection, except when present at the edges of the tested fasteners. I am getting really confused in the finishing section. Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners.
The properties of the coatings shall conform xstm the ASTM standards for the individual? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. To secure uniformity of results, samples shall be aged at room temperature for 24 h before being subjected to the salt spray test.
This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. For example, rather than specifying: Originally published as F — Long screws and bolts have a length-to-diameter ratio greater than 5 but less than This standard does not purport to address all of the safety concerns, if any, associated with its use.
The values given in parentheses are for information only. The electrical continuity is maintained between the parts by the rack itself. This abstract is a brief summary of the referenced standard. Baking to relieve hydrogen embrittlement must be performed prior aetm the application of the chromate?
ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?
Special processing is normally required for bolts with a ratio greater than 10 in order to minimize the extremity-to-center thickness ratio. Which finish to choose? Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. See Section 10 and Appendix X1. If heavier coatings are required allowance for the deposit buildup must be made during the manufacture of fasteners.
NOTE 1—Fasteners with a speci? Thick or thin local thickness in a location other than a signi? Test Method F is a recognized veri? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The coating must not cause the basic thread size to be transgressed by either the internal or external threads. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.