Answer Posted / ashok bojja

1/2" NPT and M20x1.5 Both are different thread standard,
NPT (Nominal Pitch Thread) is British standard and the
other one is Metric standard. But here for cable gland
1/2"NPT the fixing thread will be in conical shape and
M20x1.5 (20 mm Dia. with 1.5 mm pitch) flat shape.

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