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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This material provides general information only and is not intended as a substitute for competent professional examination and verification as to suitability and applicability.
ASTM F2329 vs. ASTM A153
Authored by Alana Hochstein. F defines the two different lots and their associated sampling plans as follows: These requirements are established by the applicable product standard, such as Speci? Smoothness of a surface is a relative term.
Rejection and Rehearing On the other hand, if embrittlement testing is necessary under F, it is to be conducted per ASTM F a wedge positioned and tensioned under a bolt headwhich is a different method than any of the methods described within A Paragraph 9. NOTE 2—Hot-dip washers tend to bond to each other. Phil- The hot dip galvanizing process is more or less the same within all of those standards, the difference is how they are handled. Nails and rivets are not included in this specification.
In the case of a fully threaded rod, the thickness measurements shall be determined at each end of the article. The following tests astn be made to ensure that f2392 zinc coating is being furnished in accordance with this specification: Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxqstm service astm.
ASTM F The standard specification that covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special threaded fasteners applied by the hot-dip coating process. The manufacturer shall afford the representative of the purchaser all reasonable facilities to satisfy him that the zinc coating is being furnished in accordance with this speci?
Spinning removes excess zinc from the fastener so that the nut will mate with the bolt. This process involves the removal of excess zinc by spinning the parts in a centrifuge, or brushing the threaded portion, or handling otherwise to remove the excess zinc. In no case shall the average of the measurements be below the average thickness shown in the Average Thickness on Individual Specimen column see All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.
Historical Version s – view previous versions of standard.
Also a high tension rod U Bolt 14mm diameter and 2 meters in length also with its respective fasteners. It is necessary for the galvanizer to communicate the bath temperature to the customer to ensure the end user understands the effects the galvanizing temperature will have on the steel. The zinc used for the coating shall conform to the chemical axtm required. D Visual inspection for conformance. Will galvanizing bolts, that will be used for Sub-Sea hydratightightening using AquaMax jacks permissible, or would the stretching of the bolt under tension remove the galvanized warranty.
The number of specimens to be tested per order shall be as speci? 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.
Hot-Dip Galvanizing Specifications
The major differences between the two specifications, described below, include topics related to sampling protocol, coating thickness, inspection, embrittlement, and documentation. Afif — The difference between hot dip galvanizing structural articles and fasteners is the spinning.
A touches on threaded fasteners, but is not fastener specific. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for:.
The information provided herein is not intended as a representation or warranty on the part of the AGA. Many thanks Sal from Dubai.
ASTM F vs. ASTM A | American Galvanizer’s Association
Fasteners which are subjected to severe work hardening must be stress-relieved prior to galvanizing. If your requirement is for hot dip galvanizing, electroplating would not be sufficient. It is important to ensure the customer specifies which type of lot is required.
We are are not certain what standards are commonly used in Dubai, so we cannot speak to those. For test method, adtm Coating Thickness Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens.
Compared to the sampling plan in A, F requires fewer samples per batch lot size, but the galvanizer is required to also conduct adhesion testing and visual inspection for appearance on these test articles as defined by Table 1.
Galvanizing fasteners in accordance with A, will usually meet or exceed the requirements of F, because F defers to A in many sections. It is important to note the acceptance criterion in all cases is zero defects.