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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F — 05 Standard Speci? A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Nails and rivets are not included in this 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.
Current edition approved Feb. 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. Materials and Manufacture 5.
In addition, small parts shall be air cooled as needed in order to prevent the formation of zinc oxide. NOTE 1—The scope of this speci? These requirements are established by the applicable product standard, such as Speci? Chemical Composition of Zinc 6. 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.
When requested by the purchaser, the average galvanizing temperature that the fasteners will be subjected to shall be furnished. 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. For high strength fasteners having a speci? If required by the product standard or by the purchaser, mechanical descaling with or without?
Hot-Dip Galvanizing Specifications – Portland Bolt
Baking shall be conducted after pickling and prior to hot-dip galvanizing. Coating and Dimensional Requirements 8.
C Coating thickness frequency of measurements: For test method, see D Visual inspection for conformance. Average Thickness of Individual Specimen 0. Fasteners and nuts over 3?
In the case of a fully threaded rod, the thickness sstm shall be determined at each end of the article. In no case shall the average of the measurements be below the average thickness shown in the Average Thickness on Individual Specimen column see The number of specimens to be tested per order shall be as speci?
Note—Based upon mathematical calculations, 1. B For test method, see In no case shall the average reading of a single specimen be below the average asfm shown in the Average Thickness on Individual Specimen column. The purchaser shall ensure that the effect of the heat generated by the galvanizing process is compatible with the fastener regarding the?
Furthermore, the galvanizer shall not be held responsible for any unanticipated distortion of parts. In addition, the purchaser shall provide fasteners having sufficient dimensional allowance to accommodate the zinc thickness deposition, as required in 8.
The method for testing asmt condition of adherence is speci? Workmanship, Finish, and Appearance 9. Galvanized washers shall not be bonded to each other see Note 2.
Parts may be dull due to the 2f329 of silicon in the steel. The dull f229 shall not be cause for rejection. NOTE 2—Hot-dip washers tend to bond to each other. Suitable acceptance criteria shall be agreed between the purchaser and the galvanizer before placing the order. Unless otherwise agreed to in the purchase order, delivered galvanized washers shall not be bonded to each other. The selection of the sampling plan shall be in accordance with Guide F In case the geometry of the specimen does not permit?
Thus, the thickness determined is a point value. The average of those selected measurements is the average coating thickness.
Hot-Dip Galvanizing Specifications
Smoothness of a surface is a relative term. Minor roughness that does not impair the intended use of the part, or roughness that is related to the uncoated surface condition of the part, shall not constitute grounds for rejection of the parts.
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? All inspections and tests shall be made at the place of manufacture prior to shipments, unless otherwise satm Rejection and Rehearing They shall then conform to the requirements of this speci? Packaging and Package Marking The packaging shall comply with the purchaser requirements.
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