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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This specification is intended to be applied to hardware items that are centrifuged or otherwise handled to remove excess zinc.
It is important to note the acceptance criterion in all cases is zero defects. For each of these types, there are also inspection criteria for coating thickness, f239 appearance, and adhesion. 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 astn gauges. 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.
Otherwise, a third party will be required to apply the lubricant at an additional cost. ASTM A This specification covers the requirements asttm hot-dip galvanizing on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.
Hot-Dip Galvanizing Specifications – Portland Bolt
This material provides general information only and is f2239 intended as a substitute for competent professional examination and verification as to suitability and applicability.
Since aatm 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. The information provided herein is not intended as a representation or warranty on the part of the AGA. Fasteners which are subjected to severe work hardening must be stress-relieved prior to galvanizing.
There are three columns listing the number of test articles for three different inspection tests required under F ASTM A A covers galvanizing on many products including fasteners, while F is specific to threaded fasteners, nuts and washers.
The two specifications have virtually identical coating thickness requirements. Table 2 of F lists average coating g2329 requirements for production lots, batch lots, and individual specimens.
Dane- Thanks for response. Link to Active This link will always route to the current Active version of the standard. Nails and rivets are not included in F The differences in the types of lots entail different sampling plans, which specify the number of test articles for performing various test methods during inspection of the finished product.
If you are concerned about the hardness dropping, you could look at alternatives platings that do not require heat, like mechanical galvanizing.
ASTM F2329 vs. ASTM A153
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. It is not a dip spin coating like hot dip galvanizing is. All the ASTM fastener standards refer to F for hot dip galvanizing, so that would be the most appropriate standard to reference.
The coating thickness requirements of A Table 1 meet or exceed those of F Table 2 except for:.
Also in which material we are coating or galavanizing. Best practice is to note the bath temperature when galvanizing steel to F, although only the average bath temperature is required.
ASTM F – Portland Bolt
According to Note C of Table 1, It is only required to conduct testing on samples for coating thickness once every five batch lots.
Could you please clarify? Contact us if you have a need for hot-dip galvanized fasteners or with any technical questions regarding hot-dip galvanizing.
Beams and structural members are defined as steel products and are galvanized per A Gagan- Sometimes the heat from the hot dip galvanizing operation can slightly soften small hardened items like this. Also, A and F have different sampling requirements; F requires more samples per lot than A Spinning removes excess zinc from the fastener so that the nut will mate with the bolt.
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 satm Table 1, and for every batch lot.
Nails and rivets f329 not included in this specification. The acceptance number in all cases is zero defects. The amount of additional documentation beyond ASTM A requirements will vary depending on a number of optional requirements the customer can specify under F April 10, Authored by Bernardo A.