Methodology guide
Ladder limits and when to use a longer clamp.
Calculator
F-clamp size by opening
Enter maximum opening (inches). Get a 6 / 12 / 24 / 36 in F-clamp class or NO_MATCH. Confirm throat depth and load rating before you buy.
Result
Worked checks: 4 → 6 · 10 → 12 · 18 → 24 · 30 → 36 · 40 → NO_MATCH. classLbs equals opening class (6 / 12 / 24 / 36).
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