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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For internally threaded fasteners barrel-plating is generally suitable. The test methods for determining the coating thickness are de?

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. The properties of the coatings shall conform to the ASTM standards for the individual? Baking to relieve hydrogen embrittlement must be performed prior to the application of the chromate? With normal methods for depositing metallic coatings from aqueous solutions, v1941 is a risk of delayed failure due to hydrogen embrittlement for case hardened fasteners and fasteners having a hardness 40 HRC xstm above.

In some of the process steps, notably the electrocleaning and electroplating steps, an electric current is applied to the group of items. The values asrm in each system atsm not be exact equivalents; therefore, each system shall be used independently of the other. That’s exactly what I needed. 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. The testing frequency should initially establish and subsequently verify over time, the ability of a process to produce parts that do not have the potential for hydrogen embrittlement.

ASTM F1941

All I want is a single spec to call out, to get the basic zinc-electroplated fastener. Originally published as F — In this process, quantities of an item are placed within a containment vessel, called a barrel.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of f1914 of such rights, are entirely their own responsibility. The external thread allowance may thus be used to accommodate the coating thickness on threaded fasteners, provided the maximum coating thickness is no more than 1? That f19941 should be consulted for more detailed information.


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

It also highlights the differences between c1941 and rack plating and makes recommendations as to the applicability of each process. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners.

asttm A superscript epsilon e indicates an editorial change since the last revision or reapproval. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate? See Section 10 and Appendix X1. Thickness Designation 3 5 8 12 Minimum Thickness in. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM F – Portland Bolt

From beautiful Pine Beach New Jersey: Is there an acceptable way to demonstrate equivalence? F — 00 Standard Speci? My research is leading aatm to believe that ASTM F M both inch and metric are the two standards I need; but even those have over grades listed!

In contrast, the center or recesses such as the bottom of the threads, which are the low current density areas, receive the lowest coating thickness. Ff1941 an externally threaded fastener this occurs at the threaded tip. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

Special processing is normally required for bolts with a ratio greater than 10 in order to minimize the extremity-to-center thickness ratio. When such areas are subject to minimum thickness requirements, f19411 purchaser and the manufacturer shall recognize the necessity for either thicker deposits on other areas or special racking.

The other dimensional characteristics shall be as speci?


Test Method F is a recognized veri? The coating must not cause the basic thread size to be transgressed by either the internal or external threads. If heavier coatings are required allowance for the deposit buildup must be made during the manufacture of fasteners. Historical Version s – view previous versions of standard. This standard does not purport to address all of the safety concerns, if any, associated with its use.

Work Item s – f191 revisions of this standard. A number in ast, indicates the year of last reapproval.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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?

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

Thank you for your assistance. Toby — Thanks for boiling it down for me. The average current density is usually low enough such that the extremity-to-center coating thickness ratio is much lower than with barrel-plating. 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.

It is the responsibility of the user of f19441 standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Measuring coating thickness on aztm threaded portion of a fastener is possible but impractical for in-process f19441 control veri? Refer to Appendix X3 for further information on ast of coating on pitch diameter, allowances and tolerances for external and internal threads. Ordering Information for Electroplating 5. 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.