Thread Identification Guide 1.0 (Mobile)

Thread Identification Guide By Scott Erkkila Copyright 2009 This guide shows how to identify 10 of the most common thread types for fluid and gas transfer. Also specified are thread subtypes. Included are most of the major dimensions of each thread type, including nominal diameter, outside diameter of the male connector and inside diameter of the female connector. Threads specified: NPT - National Pipe Thread JIC - 37 degree Flare SAE O-Ring Boss ORFS - O-Ring Face Seal SAE 45 degree Flare SAE Inverted Flare BSP - British Standard Pipe DIN 24 Metric JIS - Japanese Industrial Standard Komatsu These threads are standards from different regions, like North America, Britain, Germany and Japan. These threads combined make up at least 99% of the threads used in hydraulic applications. With a high influx of foreign made machinery, this information is useful in identifying unfamiliar threads. Consult this guide next time you need to identify a thread for fluid or air transfer.