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Size a V-band clamp to the pipe’s outer diameter and the flange set’s OD, apex width, and profile — not the old clamp shell.
For the full breakdown, see our best V-Band Exhaust Clamps guide.
When a V-band joint leaks, the cause is usually a clamp sized for the wrong part. Knowing how to spec a V-band exhaust clamp means measuring the pipe’s outside diameter where the flange welds on, then matching the clamp to the flange set’s own dimensions — overall OD, apex width, and profile. Skip those numbers and no torque setting will save the joint.
What Do You Measure To Spec A V-Band Clamp?
Four measurements decide the fit: the pipe OD where the flange welds, the flange set’s overall OD, its apex width, and — for interlocking sets only — the female retainer’s diameter and depth.
The pipe OD is the number every guide tells you to take first, measured at the exact spot where the flange will be welded. That dimension, not the old clamp’s shell, drives