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.

The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated. Refer to Appendix X3 for further information on effects of coating on pitch diameter, allowances and tolerances f9141 external and internal threads.

The chromate finish letter E designates a black color. From beautiful Pine Beach New Jersey: Link to Active This link will always route to the current Active version of the standard.

ASTM / ASME spec F1941 for Zinc Plating … Which finish to choose?

As the barrel is moved through the process steps, it is also rotated such that the individual items are constantly cascading over one another. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: On an externally threaded fastener this occurs at the threaded tip.

  DIN 4108-7 PDF

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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

It should be noted that modi? Work Item s – proposed revisions of this standard.

ASTM F – Portland Bolt

Eight hours is considered a typical example of baking duration. Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate?

It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance. Coating thickness values are based on the tolerances for 1A and 2A external Uni? December 9, Q. Xstm finish to choose? The average current density is usually low enough such that the extremity-to-center coating thickness ratio is much lower than with barrel-plating. This abstract is a brief summary of the referenced standard.

This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with asttm screw threads. Nonmagnetic Coatings on Magnetic Basis Metals.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Measuring coating thickness on the threaded portion of a fastener is possible but impractical for in-process quality control veri? See Section 10 and Appendix X1. 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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the astmm address or at phonefaxor service astm.


ASTM F1941

ashm 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. I am getting really confused in the finishing section.

Changing the last letter to a B means that the chromate is blue-bright transparent with f194 bluish tinge and slight Iridescence or C means that it is yellow yellow iridescent. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.

Last previous edition F — 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.

We do not specify specific plating specs; we simply use the general name. The external thread allowance may thus f9141 used to accommodate the coating thickness on threaded fasteners, provided the maximum coating thickness is no more than 1?

The local coating zstm on a part is a result of the electrical current density at that location. Long screws and bolts have a length-to-diameter ratio greater than 5 but less than With normal methods for depositing metallic coatings ast, 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.

The external thread damage is also minimized in comparison to barrel-plating due to the absence of tumbling. Originally published as F —