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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If heavier coatings are required allowance for the deposit buildup must be made during the manufacture of fasteners. Therefore, the application of a metallic coating by electrodeposition is not recommended asstm such fasteners.
Baking v1941 relieve hydrogen embrittlement must be performed prior to the application of the chromate? My follow up question would be, if the fasteners are coated f19941 trivalent chromite sstm the designation “T”atm do the salt spray hours in the ASTM spec differ between any color chromate designation? Special processing is normally required for bolts with a ratio greater than 10 in order to minimize the extremity-to-center thickness ratio.
The rack is designed to move the group of items, together, through each of r1941 process steps, allowing ready ingress and egress of processing solutions and rinses. The values given in parentheses are for information only. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.
However, if not designated, signi? High current densities increase hydrogen charging. For this reason the control mechanism speci? 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 is yellow yellow iridescent. NOTE 1—Fasteners with a speci? When such areas are subject to minimum thickness requirements, the purchaser and the manufacturer shall recognize the necessity for either thicker deposits on other areas or special racking.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Adtm applies to the following cases: However the following restrictions apply: 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 can 6 damage the external threads of fasteners. Nonmagnetic Coatings on Magnetic Basis Metals.
The appearance of corrosion products visible to the unaided eye at normal reading distance shall be cause for rejection, except when present at the edges of the tested fasteners. Historical Version s – asmt previous versions of standard.
ASTM F – Portland Bolt
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
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 f941 below. 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?
Thickness Designation 3 5 8 12 Minimum Thickness in. Awtm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Thick or thin local thickness in a location other than a signi?
Eight hours is considered a typical example of baking duration. Work Item s – proposed revisions of this standard. This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. 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 standard does not purport to address all of the safety concerns, if any, associated with its use. On an externally threaded fastener this occurs at the threaded tip. 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. This phenomenon is accentuated with increasing sstm and decreasing diameter of the screw or bolt.
The other dimensional characteristics shall be as speci?
ASTM / ASME spec F for Zinc Plating Which finish to choose?
The local ast thickness on a part is a result of the electrical current density at that location. The average current density is usually low enough such that the extremity-to-center coating thickness ratio is much lower than with asgm. NOTE 2—With proper care many steel fasteners can be plated without baking by correlating process conditions to the susceptibility of the fastener material to hydrogen embrittlement, and by applying adequate process control procedures, such as those outlined in Appendix X4.