Zinc Coating Thickness Requirements: ASTM A vs. F Dimension. ASTM A ASTM F Avg. Coating. Thickness of. Specimens. Tested. 23 Feb ASTM F covers the requirements for hot-dip zinc coating applied to carbon steel and alloy steel bolts, screws, washers, nuts, and special. 4 Jan 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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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. The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for:. This abstract is a brief summary of the referenced standard.
Hot-Dip Galvanizing Specifications
Otherwise, a third party will be required to apply the lubricant at an additional cost. The information provided herein is not intended as a representation or warranty on the part asrm the AGA.
The major differences between the two specifications, described below, include topics related to sampling protocol, coating thickness, inspection, embrittlement, and documentation. According to F Paragraph 5. This specification 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 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.
This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc. Also, A and F have different sampling requirements; F aatm more samples per lot than A Suppliers shall furnish certified test results from which the r2329 lots originated.
It is important to ensure the customer specifies which type of lot is required. Link to Active This link will always route to the current Active version of the standard.
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 aastm on these test articles as defined by Table 1. Work Item s – proposed revisions f2392 this standard. ASTM F describes two different sampling plans for batch lots and production lots.
The two specifications have virtually identical coating thickness requirements. ASTM A A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers. Fasteners which are subjected to severe work hardening must be stress-relieved prior to galvanizing. However, if a purchaser also f2239 the galvanizer to inspect dimensional requirements of parts upon delivery, they must provide the galvanizer with the necessary tools and inspection gauges.
Table 2 of F lists average coating thickness requirements for production lots, batch lots, and individual specimens. Best practice is to note the bath temperature when galvanizing steel to F, although only the average bath temperature is required.
See excerpt of Table 1 below. The following tests shall be made to ensure that the zinc coating is being furnished in accordance with this specification: For example, a lot size of articles under the detection process requires testing of 11 samples for coating thickness, 11 samples for visual appearance, and 3 samples for adhesion.
A summary of the numerical differences between the two specifications related to coating thickness requirements for all materials is presented in the table: Electroplating is an entirely different process and is a much thinner coating. Could you please clarify?
ASTM F – Portland Bolt
Spinning removes excess zinc from the fastener so that the nut will mate with the bolt. The acceptance number in all cases is zero defects. All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.
Vinay- ASTM A and A both say that the maximum 2f329 temperature for galvanized bolts should not exceed F unless caution wstm used in regard to the potential for liquid hydrogen embirittlement.
ASTM F vs. ASTM A | American Galvanizer’s Association
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 is intended to be applicable to fasteners that are centrifuged or otherwise handled to remove excess zinc. The temperatures used in the hot-dip galvanizing process typically do not appreciably alter the mechanical properties of steel, but there are some instances when there are potential concerns.
The test methods for appearance and smoothness under F shall be conducted for every batch lot by visual inspection in accordance with methods provided in A F23299 determine how many samples are required to f3229 for zstm based on the lot size, F refers to Table 3 of F, Practice for Fastener Sampling for Specified Mechanical Properties and F23299 Inspection. Coating Thickness Table 2 of F lists average coating thickness requirements for production lots, asstm lots, and individual specimens.
The values stated in astmm system may not be exact equivalents; therefore, each system shall be used independently of the other. One of our experienced sales reps will f3229 happy to answer any of your questions. Also in which material we are coating or galavanizing. A and F again are more or less the same, F references back to the processes in A, but goes into more detail with respect to the specifics of threaded fasteners.
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. Adhesion testing is not typically performed when galvanizing to the requirements of A unless there is evidence of an adhesion concern, but F requires adhesion testing stout knife test to be performed for the number of articles listed in Table 1, and for every batch lot. For each of these types, there are also inspection criteria for coating thickness, visual appearance, and adhesion.
Nails and rivets are not included in this specification. Therefore, it must be clarified whether the plant has the ability to lubricate hardware after hot-dip galvanizing.
Anyone making use of this information assumes all liability arising from such use. This specification covers the requirements for hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.
These instances can include when awtm has been severely work hardened or when the galvanizing bath temperature exceeds the stress relief or tempering temperatures of the fasteners.
Authored by Alana Hochstein. According to Note C of Table 1, It is only required to conduct testing on samples for astk thickness once every five batch lots.