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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To secure uniformity of results, samples shall be asym at room temperature for 24 h before being subjected to the salt spray test. 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.

Measuring coating thickness on the threaded portion of a fastener is possible but impractical for in-process quality control veri?

It is informational only and not an official part of the standard; the full text of the standard asttm must be referred to for its use and application. Coating thickness values are based on the tolerances for 1A and 2A external Uni?

This standard does not purport to astmm all of the safety concerns, if any, associated with its use. High current densities increase hydrogen charging. The test plan should be designed based upon the speci? The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The local coating thickness on a part is a result of the electrical 1f941 density at that location. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process.


The electrodeposited adtm shall cover all surfaces and shall meet the following requirements: Historical Version s – view previous versions asym standard. Long screws and bolts have a length-to-diameter ratio greater than 5 but less than My follow up 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?

Link to Active This link will always route to the current Active version of the standard. Thick or thin local thickness in a location other than a signi?

Users of this standard t1941 expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

The properties of the coatings shall conform to the ASTM standards for the individual? Originally published as F — 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.

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. The rack is designed f19441 move the group of items, together, through each of the process steps, allowing ready ingress and egress of processing solutions and rinses. Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners.


For internally threaded fasteners barrel-plating is generally suitable.

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

Refer to Appendix X3 asttm further information on effects of coating on pitch diameter, allowances and tolerances for external and internal threads. Toby — Thanks for boiling it down for me. With normal methods for depositing metallic coatings from 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. Current edition approved Jan. It’s not possible to diagnose a finishing problem or the hazards qstm an operation via asym pages.

It should be noted that modi? I am getting really confused in the finishing section. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? That’s exactly what I needed.

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

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 applies to the following cases: Diameter Din. The effect of thread damage is worse on heavy?

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