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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. One year after installation the bolts are rusting.

The tightening torque may vary from f136 finish or other coatings, but the bolt should still function the same. That said, I do not know much about fluorocarbon coatings and how they are applied. We are not sure how fragile the coating is during installation.

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.

Serge- We have very little experience with Dacromet coating. The coating process does not induce the possibility of internal hydrogen embrittlement provided that the fasteners have not been cleaned or pre-treated with an acid or phosphate. Your email address will not be published.

High Strength Bolts Coatings

We assumed that the properties on the bolts is not affected but the final tension might be change? I am using A grade BC and need a smooth finish with minimal irregularities. Since we are using A bolts in our structure, we have to propose a replacement. Parham- We cannot make specific recommendations, but I can say that painting A bolts is quite common. It is required that the bolt and nut are coated by the same process, but the washer can be an alternate coating.


The bolts and nuts are already coated with Dacromet and the proposal is to coat the DTI washers with Magni The basecoat can contain chrome C or be non-chrome NC. This abstract is a brief summary of the referenced standard. Since the bolts are pre-tensioned, will there be any issues with Magni with regard to pre-tensioning i.

The corrosion protection offered by F in those c1136 would be superior to nothing at all. Leave a Reply Cancel reply Your email address will not be published. No metric equivalents are presented in this specification. What corrosion-resistant coatings are available for high-strength over ksi bolts? I suppose they are similar to painting. 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.

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. They were used to f11136 flange type splices of two tubular monopole sections. 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.

Work Item s – proposed revisions of this standard.

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. 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. Is fluorocarbon coating acceptable to A bolts for corrosion prevention? Historical Version s – view previous versions of standard.


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.

Hello, We have specified A Dracomet coated bolts for a telecommunications monopole in Canada. Bandana- There are no issues mixing coatings with DTI washers. 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.

High Strength Bolts Coatings – Portland Bolt

Hi, Recently we were informed that Dacromet coating is being phased out. Leave this field empty. Protective Coatings ASTM recommends that if a protective awtm is required for A bolts, one of two approved coatings is recommended. 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. We also see no g1136 with pre-tensioning. Is the coating that fragile?

Depending on the amount of corrosive forces at work in the application, F may be sufficient, but it may not.