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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No metric equivalents are presented in this specification. I do not have any friction coefficient information on Magniso I do not know how much the torque will be affected.
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. The corrosion protection offered satm F in those cases would be superior to nothing at all.
Consulting a structural engineer involved on the project is always the best solution. That said, I do not know much about fluorocarbon coatings and how they are applied. 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.
Your first question, is it appropriate to specify ASTM F Grade 3would be best answered by an engineer familiar with the coating and the application. Protective Coatings ASTM recommends that if a protective coating is required for A bolts, one of two approved coatings is recommended.
Hello, We have specified A Dracomet coated bolts for a telecommunications monopole in Canada.
High Strength Bolts Coatings
They were used to in flange type splices of two asm monopole sections. No other units of measurement are included in this standard.
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. F Grade 3, commonly known as Dacromet. One year after installation the bolts are rusting.
High Strength Bolts Coatings – Portland Bolt
Since the Dacromet and Magni will be in contact with one another, Are they compatible with one another? The basecoat can contain chrome C or be non-chrome Asmt. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
This fastener is made from weathering steel which is inherently corrosion resistant. Link to Active This link will always route to f113 current Active version of the standard.
Normally where I see F specified is in applications with higher strength fasteners that cannot be hot-dip galvanized, such as ASTM A heavy hex bolts.
Alkaline cleaning or vapor degreasing is required along with shot blasting to remove rust or scale. Pierre-Paul — The properties of the bolt and the final tension should not be impacted. Jovito- We would be happy to quote your specific bolting needs if you want to send us a list of the bolts you are looking for. We are not sure how fragile the coating is during installation.
Although hot-dip galvanize provides high thickness level barrier protection 2 mils for substrates, it is not 1f136 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.
Due to hydrogen embrittlement concerns ASTM recommends against hot-dip galvanizingmechanical deposition, or electroplating with zinc or other metallic coatings on high strength bolts ultimate tensile strengths t1136 exceed ksi.
Atm the coating that fragile? Referenced Documents purchase separately The documents listed below are referenced within t1136 subject standard but are not provided as part of the standard.
Hot-dip galvanized hex nuts are therefore tapped oversize to accommodate the thick coating, whereas F specifically states that the thread fit shall not be adversely affected. The coating process does r1136 induce the possibility of internal hydrogen embrittlement provided that the fasteners have not been cleaned or pre-treated with an acid or phosphate.
It is required that the bolt and nut are coated by the same process, but the washer can be an alternate coating. This astk is a brief summary of the referenced standard. But there are some doubts.
We also see no issues with pre-tensioning. Parham- We cannot make specific recommendations, but I can say that painting A bolts is quite common. I am using A grade BC and need a smooth finish with minimal irregularities. Hi, Recently we were informed that Dacromet coating is being phased out. Bandana- There are no issues mixing coatings with DTI washers. Leave a Reply Cancel reply Your email address will not be published.
So what are f1316 alternatives to provide corrosion resistance for A structural bolts? Your email address will not be published. Is fluorocarbon coating acceptable to A bolts for corrosion prevention?
If so, did the tension will f113 higher? However, these fasteners are not as readily available in the marketplace as A Type 1. Historical Version s – view previous versions of standard. As for the thickness of both coatings, F grade 3 specified a coating thickness of 0. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for c1136 use and application.
The bolts and nuts are already coated with Dacromet and the proposal is to coat the DTI washers with Magni Since we are using A bolts in our structure, we have to propose a replacement.
Work Item s – proposed revisions of this standard. Depending on the amount of corrosive forces at work in the application, F may be sufficient, but it may not. What corrosion-resistant coatings are available for high-strength over ksi bolts? I suppose they are similar to painting.
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. Serge- We have very little experience with Dacromet coating.