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This software provides diametral dimensions for Screw Thread Inserts, following the Helicoil standards adopted by ASME. The gage dimensions comply with those same standards, as specified below. If the user specifies a diameter-pitch combination not in the tabulated standard, the program will specify dimensions applying the rules specified in the standard for calculating dimensions.
For the (internal) STI threads, the supported pitch diameter tolerance classes are 2B and 3B. The external side of the screen will allow the user to view specifications for a corresponding UN external thread. Regardless of the choice for pitch diameter tolerance class, the minor diameter uses 3B tolerance.
References :
For STI product threads, see
ASME B18.29.1-2010;
For gages, see ANSI/ASME B1.2-1983.
For the (internal) STI threads, the supported pitch diameter tolerance classes are 4H, 5H, 6H. The external side of the screen will allow the user to view specifications for a corresponding metric (M) external thread. Regardless of the choice for pitch diameter tolerance class, the minor diameter uses 5H tolerance.
References :
For Metric STI product threads, see
ASME B18.29.2M-2005;
For gages, see ANSI/ASME B1.16M-1984.
Working Thread Rings are used to gage external product threads. The "GO" ring should assemble with the product it is gaging, whereas the "NOT GO" ring should not. Generally, the minimum major diameter is specified, without a tolerance.
Working Thread Plugs are used to gage internal product threads. The "GO" plug should assemble with the product it is gaging, whereas the "NOT GO" plug should not. Generally, the maximum minor diameter is specified, without a tolerance.
Setting Rings are used to set indicating gages for internal product threads. GO rings are used to set gages to the maximum material size, NOT GO for the minimum material size. Generally, the minimum major diameter is specified, without a tolerance.
Setting Plugs are used to set indicating gages for external product threads, in addition to adjustable working ring gages. GO plugs are used to set gages to the maximum material size, NOT GO for the minimum material size. Generally, the maximum minor diameter is specified, without a tolerance.