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A325 bolt grade for outdoor 450 degree ductwork?

A325 bolt grade for outdoor 450 degree ductwork?

A325 bolt grade for outdoor 450 degree ductwork?

(OP)
Which is a better choice for structural connections for outdoor ductwork that can reach 450 degrees?

1. A325 Type 1 bolt (galvanized finish), F436 washer (galvanized finish), and DH A563 nut

2. A325 Type 3 bolt (plain finish), F436 washer (plain finish), and DH3 A563 nut

RE: A325 bolt grade for outdoor 450 degree ductwork?

degrees of what? C or F?

RE: A325 bolt grade for outdoor 450 degree ductwork?

(OP)
It's degrees F

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