How F-clamp opening sizing works
Class ladder, throat depth, and when to go longer.
F-clamp opening screen
F-clamp size by opening
Enter max opening in inches. Get the smallest 6 / 12 / 24 / 36 in F-clamp class — or NO_MATCH. Bar clamps only; confirm throat and load rating.
F-clamp opening screen
Result
Match the smallest class whose opening covers your workpiece. Classes: 6 · 12 · 24 · 36 in. Above 36 → NO_MATCH. Not pipe, C, or parallel clamps.
From measurement to decision
Open the full calculator
Same tool with room for examples.
6 vs 12 vs 24 vs 36 in
When each class fits — and when none do.
No resources match. Try another term.