Methodology guide
Breakaway torque, rust factors, and practice notes.
Calculator
Cordless impact ft-lb class calculator
Enter target breakaway torque and rust factor. Get the smallest 280 or 900 class or NO_MATCH.
Result
Required ft-lb ≈ target_ftlb × rust factor. Factor = 1.0 (clean) or 1.5 (seized). Classes: 280 · 900 (max ~958.8 loosening). Above ceiling → NO_MATCH.
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