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![1/2 inch x 12 TPI [Medium Class] BSW - Go/No-Go Plug Thread Gauge (JBO Johs Boss)](https://i.accu.co.uk/icons/1-year-warranty.jpg "1/2 inch x 12 TPI [Medium Class] BSW - Go/No-Go Plug Thread Gauge (JBO Johs Boss)"){kind=icon}
1/2 inch x 12 TPI [Medium Class] BSW - Go/No-Go Plug Thread Gauge (JBO Johs Boss)
THREAD PITCH GAUGE; 16 BLADES; 1 - 12 TPI
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Thread Pitch Chart -
![1 1/4 inch x 12 TPI [2A] UNF - Left Hand - No-Go Ring Thread Gauge (JBO Johs Boss)](https://i.accu.co.uk/component/27-7529-0.jpg "1 1/4 inch x 12 TPI [2A] UNF - Left Hand - No-Go Ring Thread Gauge (JBO Johs Boss)")