This standard is issued under the fixed designation F ; the 1 This specification is under the jurisdiction of ASTM Committee F16 on. ASTM: F – Standard Specification for Chromium/Zinc Corrosion Protective Coatings for Fasteners. 1. Scope This specification covers the basic. ASTM F/FM Standard Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners. standard by ASTM.
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We are not sure how fragile the coating is during installation. Alkaline cleaning or vapor degreasing is required along with shot blasting to remove rust or scale. I suppose they are similar to painting. The tightening torque may vary from asgm finish or other coatings, but the bolt should still function the same. Serge- We have very little experience with Dacromet coating. Normally where I see F specified is in applications with f116 strength fasteners that cannot be hot-dip galvanized, such as ASTM A heavy hex bolts.
No metric equivalents are presented in this specification. Depending on the amount of corrosive forces at work in the application, F may be sufficient, but it may not.
It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. No other units of measurement are included in this standard. As for the thickness of both coatings, F grade 3 specified a coating thickness of 0.
Link to Active This link will always route to the current Active version of the standard. Is the coating that fragile? Hi, Recently we were informed that Dacromet coating is being phased out. However, these fasteners are not as readily available in the marketplace as A Type 1. Leave a Reply Cancel reply Your email address will not be published.
A coatings engineer may choose to allow an exception in some cases, but ASTM will not officially sanction any coatings that are not approved by the F16 committee. Although hot-dip galvanize provides high thickness level barrier protection 2 mils for substrates, it is not approved for use on high strength bolts because hot dip galvanize is susceptible of hydrogen embrittlement and cracking of fasteners that can result out in the field.
The basecoat can contain chrome C or be non-chrome NC. The coatings are classified into six grades Grades 1 to 6 according to the required minimum basecoat thickness, and when tested, shall conform accordingly to appearance, adhesion, corrosion resistance, blister, thread fit, and hydrogen embrittlement requirements. The corrosion protection offered by F in those cases would be superior to nothing at all. Your email address will not be published.
Parham- We cannot make specific recommendations, but I can say that painting A bolts is quite common. Jovito- We would be happy to quote your specific bolting needs if you want to send us a list f1136 the bolts you are looking for.
We assumed that the properties on the bolts is not affected but the final tension might be change? Since the bolts are pre-tensioned, will there be any issues with Magni with regard to pre-tensioning i. Protective Coatings ASTM recommends that if a protective coating is required for A bolts, one of two approved coatings is recommended.
High Strength Bolts Coatings
Due to hydrogen embrittlement concerns ASTM recommends against hot-dip galvanizingmechanical deposition, or electroplating with zinc or other d1136 coatings on high strength bolts ultimate tensile strengths that exceed ksi. This abstract is a brief summary of the referenced standard. I am using A grade BC and need a smooth finish with minimal irregularities. They were used to in flange type splices of two tubular monopole sections.
Pierre-Paul — The properties of the bolt and the final tension should not be impacted. I do not have any friction coefficient information on Magniso I do not know how much the torque will be affected. What corrosion-resistant coatings satm available for high-strength over ksi bolts?
So what are the alternatives to provide corrosion resistance for A structural bolts? Consulting a structural engineer involved on the project is always the best solution.
High Strength Bolts Coatings – Portland Bolt
Your first question, is it appropriate to specify ASTM F Grade 3would wstm best answered by an engineer familiar with the coating and the application. Work Item s – proposed revisions of this standard.
Is fluorocarbon coating acceptable to A bolts for corrosion prevention? We also see no issues with pre-tensioning.
Hello, We have specified A Dracomet coated bolts for a telecommunications monopole in Canada.