91 Ford F150 4.9 inline six. What is the size of the crank shaft pulley bolt so I can turn over it by hand?

91 Ford F150 4.9 inline six. Need to know the size of the crank shaft pulley bolt so I can turn over it by hand. There's a flat spot on the fly wheel and I can't take all my tools with me.

1/2 inch torqued to around 140 ft lbs so don't forget a breaker bar.

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