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Bolt Head Markings

Bolt Head Markings

Bolt Head Markings

This is a question about orientation of Bolt Head Markings as defined in SAE J429 spec. I could not find a forum for SAE specs and since they are recognized under ANSI, I am asking here.

For grade 5 and grade 8 bolts, there is a requirement to mark the head so the bolt strength can be readily determined. I am putting head markings on my CAD library of bolts, since we use both grades, as well as grade 2. In the SAE spec, it only shows the marking pattern: 6 lines for grade 8 and 3 lines for grade 5. There is nothing in the spec that defines how high or wide or long the markings are nor is there an orientation of the marking pattern to the hex head. Does anyone know if this information is defined someplace else or just left to the manufacturer to put as they see fit?

In my CAD model, I have made the markings .010 wide and .005 high. They run from the head minimum diameter inwards for a length of 1/2 the nominal bolt size. I have orientated them with the hex points. In some reference sheets, They are shown orientated with the hex flats. Does this matter if there is no defining spec?

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

RE: Bolt Head Markings

I just stumbled upon this; anyway I looked at the spec for F 3125, which covers a variety of bolts. Under markings it says "Marking shall be on the bolt head and may be raised or depressed at the manufacturer’s option. The marking shall be visible after coating." And that's all ASTM wrote. I think as long as you reasonably mimic the markings it doesn't matter how thick or wide you make the lines.

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