NPTF, ANPT NPTF Threads are also known as Dryseal threads as they do not require a sealant to form a leak-proof joint. Type Standard Plug gauges Ring gauges NPFT ANSI/ASME B 1.20.5 Thread plug gauges L1 & L3 (Basic Step or Min/Max Step) 6 Step Crest Check Plug Thread ring gauges L1 & L2 (Basic
Baker NPTF and ANPT gauges are precision instruments designed for the inspection of Dryseal pipe threads. These threads are engineered to form a leak-proof joint without the requirement of additional sealants. The gauge system utilizes a combination of plug and ring gauges to verify thread size, taper, and crest truncation.