Methodology guide
Limits, die matching, and when to stop shopping this ladder.
Calculator
Enter measured tube OD in inches. Get a 50 / 100 / 200 class or NO_MATCH. Match die to OD (not pipe ID); wall-thickness limits; gradual hydraulic bends; PPE; secure workpiece; not for live systems.
Worked checks: 0.375 in → 50 · 0.75 in → 100 · 1.5 in → 200 · 2.5 in → NO_MATCH. classLbs uses 50 / 100 / 200 for CTA matching.
Limits, die matching, and when to stop shopping this ladder.
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