How NPT threader sizing works
Nominal size, die ceilings, and when NO_MATCH applies.
Pipe threader sizing
Ratchet pipe threader by NPT size
Enter nominal NPT inches. Get the smallest 1 in, 1-1/4 in, or 2 in max-die class — or NO_MATCH when the pipe exceeds this consumer ladder.
Pipe threader sizing
Result
Match the smallest ratchet kit whose max NPT die covers your pipe. Classes: 100 (3-die · max 1 in) · 125 (4-die · max 1-1/4 in) · 200 (6-die · max 2 in). Ladder starts at 1/2 in; above 2 in → NO_MATCH.
From measurement to decision
Open the full calculator
Same tool with room for examples.
100 vs 125 vs 200 classes
When each VEVOR ratchet kit fits — and when none do.
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