Gages are classified to the type and use along with the design requirements of the threaded assembly. In today’s manufacturing and inspection environment there still exists a demand for GO and NOT GO Methods of Thread Inspection. Johnson Gage Fixed limit gaging systems are available for the inspection of UN, UNR, UNJ, Metric, MJ, Acme, Buttress, Tapered Threads, single and multiple starts and other thread forms.
Types of External Thread Limit Gages (reference ASME B1.2):
GO Threaded Ring Gage (Split or Solid) for the Inspection of Maximum Material / GO Functional Limit.
NOT GO (LO) Threaded Ring Gage (Split or Solid) for the Inspection of NOT GO Functional Limit.
Types of Internal Thread Limit Gages (reference ASME B1.2):
GO Threaded Plug Gage for the Inspection of Maximum Material / GO Functional Limit.
NOT GO (HI) Threaded Plug Gage for the Inspection of NOT GO Functional Diameter Limit.
Plain Diameter Minimum GO plain cylinder for minor diameter
Plain Diameter Maximum NOT GO plain cylinder for minor diameter