The fastener industry should be made aware of an important recent development in the realm of. ASTM fastener standard specifications. ASTM F/. “ASME Hex Nut, 3/8 UNC-2B, SAE J Grade 5, ASTM F Zinc Coating ZN/FE Type 5B” we simply specify: “grade 5, zinc plated. ASTM F/FM: Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric.
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ASTM / ASME spec F for Zinc Plating Which finish to choose?
F194 am getting really confused in the finishing section. My company uses fasteners in the most simple sense–like the kind of fasteners you buy in the bulk bin at the local hardware store. We do not specify specific plating specs; we simply use the general name.
For example, rather than specifying: All I want is a single spec to call out, to get the basic zinc-electroplated fastener. My research is leading me to believe that ASTM F M both inch and metric are the two standards I need; but even those have over grades listed! Changing the last letter to a B means that the chromate is blue-bright transparent with a bluish tinge and slight Iridescence or C means that it is yellow yellow iridescent.
One of these should meet your needs. Toby — Thanks for boiling it down for me. That’s exactly what I needed.
Is there an acceptable way to demonstrate equivalence? The chromate finish letter E designates a black color. It is my understanding that the darker colors are a naturally occurring process due to the hexavalent chromium and provide greater corrosion resistance.
My follow up question would be, if the fasteners are coated with trivalent chromite adding the designation “T”why do the salt spray hours in the ASTM spec differ between any color chromate designation?
Isn’t the color achieved by adding a dye and the corrosive resistance achieved through a sealer or thicker chromate?
Atm you for your assistance. It’s not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer.
From beautiful Pine Beach New Jersey: Which finish to choose? December 9, Q.