What’s the difference between A320L7 and A320L43 bolts?

The raw material used to make L7 bolts is 4140 steel, whereas L43 is made from 4340 steel. They both will have similar mechanical properties. L43 bolts are more common larger than 2 ½” diameter due to raw material availability and 4340 has greater success passing the Charpy testing requirements at -150 degrees fahrenheit.

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