All threaded fasteners, fittings and connectors must be measured using accurate gaging methods to ensure the highest quality.
Blank specifications vary on straight threads and tapered pipe threads. When rolling a straight thread, machine the part's blank diameter to the maximum pitch diameter - .002 inch. Roll the thread until the pitch diameter is within specification — between the pitch diameter's maximum and minimum — and adjust the blank diameter until the major diameter is within specification — between the major diameter's maximum and minimum.
When rolling on a tapered pipe thread, machine the part's blank diameter to specifications in the chart below. Verify the blank diameter at location Y [column “Y” and “B.D.@Y”].
CJWinter's Thread Gaging Guide includes helpful measurement tips and diagrams for accurate thread gaging, including measurement features for both straight threads and tapered pipe threads. Flip through the slides below for more information.
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