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

All I want is a single spec to call out, to get the basic zinc-electroplated fastener. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Refer to Appendix X1. It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Users of this standard are expressly advised that determination of the validity of asmt such patent rights, and the risk of infringement of such rights, are entirely their own d1941.

Periodic inspections should be conducted according to 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.

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

NOTE 2—With proper care many steel fasteners can be plated 1f941 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.

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

Combining values from the two systems may result in non-conformance with the standard. The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated.


The values f191 in parentheses are for information only. Long screws and bolts have a length-to-diameter ratio greater than 5 but less than 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 standard does not purport to address all of the safety concerns, if any, associated f19441 its use. Measuring coating thickness on the threaded portion of a fastener is possible but impractical for in-process quality control veri? Is there an acceptable way to demonstrate equivalence? 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.

Screw threads that are speci? For this reason the control mechanism speci? Work Item s – proposed revisions of this standard.

It should be noted that modi? Threaded Tip, 3 0. Thickness Designation 3 5 8 12 Minimum Thickness in. Test Method F is a recognized veri?

ASTM F – Portland Bolt

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.

That’s exactly what I needed. Eight hours is considered a typical example of baking duration. This specification covers application, performance and dimensional requirements for awtm coatings on threaded fasteners with metric screw threads. See Section 10 and Appendix X1. The rack is designed to move the group aatm items, together, through each of the process steps, allowing ready ingress and egress of processing solutions and rinses. Special processing is normally required for bolts with a ratio greater than 10 in order to minimize the extremity-to-center thickness ratio.

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?

Refer to Appendix X3 for further information on effects of coating on pitch diameter, allowances and tolerances for external and internal threads. The coating must not cause the basic thread size to be transgressed by either the internal or external threads. Corrosion resistance and embrittlement of coatings shall be determined by performing mechanical tests.


ASTM F1941

For example, rather than specifying: The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. It specifies coating thickness, supplementary hexavalent chromate or trivalent chromite finishes, corrosion resistance, precautions for managing asrm risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners.

Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate? The test plan should be designed based upon the speci?

Your comments will receive careful consideration at a meeting of the responsible astj committee, which you may attend. Originally published as F — I am getting really confused in the finishing section. 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. However, if not designated, signi? Link to Active This link will always route to the current Active version of the standard.

Which finish to choose? Thank you for your assistance. The electrodeposited coating shall cover all surfaces and shall meet the following requirements: Current edition approved Jan.

That standard should be consulted for more detailed information.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Coating thickness values are based on the tolerances for 1A and 2A external Uni?

Diameter Din. Ordering Information for Electroplating 5.