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monkbonk

Brake Hose to Body Bracket Nut Size

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What's the size of that large nut that secures the brake flex hoses to the body of the Datsun 520/521?

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Not sure what you are talking about. A picture would help.

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it is size "vice-grips" or "crescent wrench"

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the  only large nut on a flex hose is on the clutch hose, 5/8x18

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This is what he is asking about. 

 

520%20521%20Brake%20Piping.jpg

 

This is mounted to the frame.  That is why I did not understand your question.

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I will guess it is a SAE fine thread as all the frame and bod bolts/nuts are SAE fine thread on the 520/521.  I do not have one to check at this time.

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3/8”  fitting to bracket nut

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