A. ASTM F is for inch-based fasteners and ASTM FM is for metric fasteners, although the designations are identical between the two. The fastener industry should be made aware of an important recent development in the realm of. ASTM fastener standard specifications. ASTM F/. ASTM F/FM: Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric.

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Refer to F1941, A1 for neutral salt spray performance requirements for zinc, zinc alloy and cadmium coatings. 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.

My research is leading me to believe that ASTM F M both inch f1941j metric are the two standards I need; but even those have over grades listed! If heavier coatings are required allowance for the deposit buildup must be made during the manufacture of fasteners.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. December 9, Q. Nonmagnetic Coatings on F141m Basis Metals. Ordering Information for Electroplating 5.

The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated.


ASTM F1941

Thickness Designation 3 5 8 12 Minimum Thickness in. The properties of the coatings shall conform asym the ASTM standards for the individual? The local coating thickness on a part is a result of the electrical current density at that location. 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.

NOTE 1—Fasteners with a speci? The test plan should be designed based upon the speci? In this process, quantities of an item are placed within a containment vessel, called a barrel.

The values given in parentheses are for information only. Special processing is normally awtm for bolts with a ratio greater than 10 in order to minimize the extremity-to-center thickness ratio. It is the responsibility of the user of this standard to establish appropriate safety and health f1941j and determine the applicability of regulatory limitations prior to use.

A number in parentheses indicates the year of last reapproval. The electrical continuity is maintained between the parts by the rack itself.

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

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. Is there f1914m acceptable way to demonstrate equivalence? 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.


Originally published as F — Users of this standard are 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. High current densities increase hydrogen charging.

To secure uniformity of results, samples shall be aged at r1941m temperature for 24 h before being subjected to the salt spray f19441m.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. If the size of the fastener is large enough to economically use the rack-plating process, then the latter shall be used to obtain this thickness requirement.

ASTM F – Portland Bolt

It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Which finish to choose? The effect of thread damage is worse on heavy? This standard does not purport to address all of the safety concerns, if ast, associated with its use.