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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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? 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.

The cascading action randomly exposes the surface of each individual piece to the process electrodes while also maintaining electrical continuity between all of the parts.

Last previous edition F — High current densities increase hydrogen charging. To secure uniformity of results, samples shall be aged at room temperature for 24 h before being subjected to the salt spray test. Test Method F is a recognized veri? The effect of thread damage is worse on heavy? The test methods for determining the coating thickness are de? December 9, Q. Baking to relieve hydrogen embrittlement must be performed prior to the application of the chromate?

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. This abstract is a brief summary of qstm referenced standard. Thank you for your assistance. Eight hours is considered a typical example of baking duration. 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.


Diameter D asm, in.

It specifies coating thickness, supplementary hexavalent chromate or non-hexavalent conversion coatings, corrosion resistance, precautions for managing the risk of hydrogen embrittlement and hydrogen embrittlement relief for high-strength and surface-hardened fasteners.

That standard should be f19941 for asfm detailed information. The test plan should be designed based upon the speci? 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.

Periodic inspections should be conducted according to a speci? It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages.

Threaded Tip, 3 0. All I want is a single spec to call out, to get the basic zinc-electroplated fastener. This specification covers application, performance and dimensional requirements for electrodeposited coatings on threaded fasteners with metric screw threads. Therefore, the application of a metallic coating by electrodeposition is not recommended for such fasteners. 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.

Ordering Information for Electroplating 5.

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

We do not specify specific plating specs; we simply use the general name. 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 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. 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 / ASME spec F1941 for Zinc Plating … Which finish to choose?

Thickness Designation 3 5 8 12 Minimum Thickness in. For example, rather than specifying: The coating material, coating thickness, chromate finish, and trivalent chromite finish shall be selected and designated.

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 adtm, which you may attend.

ASTM F – Portland Bolt

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee ashm Standards, at the address shown below. 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.

If heavier coatings are required allowance for the deposit buildup must be made during aatm manufacture of fasteners. It should be noted that modi?

It also highlights the differences between barrel and rack plating and makes recommendations as to the applicability of each process. Work Item s – proposed revisions of this standard. In this process, quantities of an item are placed on a support, called a rack.

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