Zinc Coating Thickness Requirements: ASTM A vs. F Dimension. ASTM A ASTM F Avg. Coating. Thickness of. Specimens. Tested. ASTM F covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special. ASTM A does not cover threaded bolts and fasteners. ASTM A and F are the ASTM specifications that cover the requirements for.

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ASTM A This specification covers the requirements for hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, aatm, bars, and strips. Your comments are invited either for revision satm this standard or for additional standards and should be addressed to ASTM International Headquarters.

Because A does not require water quenching nor chemical post-treatments, communication between the customer and the galvanizer is required to determine whether the galvanizer has a quench tank and the capability to perform chemical post-treatments, or if air-cooling will be acceptable.

D Visual inspection for conformance.

Leave asrm Reply Cancel reply Your email address will not be published. B For test method, see Materials and Manufacture 5. Portland Bolt performs hot dip galvanizing of threaded fasteners within our 85, square foot manufacturing facility. Therefore, it must be clarified whether the plant has the ability to lubricate hardware after hot-dip galvanizing.

Hot-Dip Galvanizing Specifications – Portland Bolt

asmt In the case of a fully threaded rod, the thickness measurements shall be determined at each end of the article. Rob- Tensioning the bolt will not adversely affect the galvanizing. Historical Version s – view previous versions of standard.


This ASTM specification covers zinc coatings applied by the hot-dip process on iron and steel hardware. Aastm acceptance number in all cases is zero defects. For high strength fasteners having a speci? If required by the product standard or by the purchaser, mechanical descaling with or without?

If the galvanizing process is carried out at a higher temperature than the stress relief or the tempering temperature of the fasteners, than the purchaser shall make provision for mechanical testing. There are three columns listing the number of test articles for three different inspection asfm required under F Packaging and Package Marking These requirements are established by the adtm product standard, such as Speci?

Afif — The difference between hot dip galvanizing structural articles and fasteners is the spinning. Threaded fasteners are handled differently in order to remove the excess zinc from the threads and would fall under A or F A covers galvanizing on many products including fasteners, while F f2392 specific to threaded fasteners, nuts and washers.

The dull appearance shall not be cause for rejection.

The differences in the types of lots entail different sampling plans, asgm specify the number of test articles for performing various test methods during inspection of the finished product.

See excerpt of Table 1 below. In no case shall the average of the measurements be below the average thickness shown in the Average Thickness on Individual Specimen column see This abstract is a brief summary of the referenced standard.

When requested by the purchaser, the average galvanizing temperature that the fasteners will be subjected to shall be furnished. Quenching According to F Paragraph 5. Also in which material we are coating or galavanizing.

Electroplating is an entirely different process and is a much thinner coating. Many thanks Sal from Dubai. The zinc used for the coating shall conform to the chemical composition required.


The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel. According to F Paragraph 5.

Hot-Dip Galvanizing Specifications

This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability. Beams and structural members are defined as steel products and are galvanized per A Since threaded fasteners are spun at high speeds in a centrifuge to remove excess zinc from the threads, they would fall under the A class C specification. It awtm important to ensure the customer specifies which type of lot is required.

Vinay- ASTM A and A both say that the maximum service temperature for galvanized bolts should not exceed F unless caution is used in regard to the potential for liquid hydrogen embirittlement.

ASTM F – Portland Bolt

Therefore, the supplier of the fasteners submitting the product to the galvanizer shall be aware of the tempering temperature of the fasteners relative to the temperature of the galvanizing bath and the potential effect it may have on the product. Workmanship, Finish, and Appearance 9. Otherwise, a third party will be required to apply the lubricant at an additional cost. However, if a purchaser also requires the galvanizer to inspect dimensional requirements of parts upon delivery, they must provide the galvanizer with the necessary tools and inspection gauges.