Abstract： ASME B16.51:2013 pdf download.Copper and Copper Alloy Press-Connect Pressure Fittings. 10.2 Threading Tolerances Nl1 threads shall be checked by use of a plug or ring gage in either standard or limit types. When gaging internal taper thread...

ASME B16.51:2013 pdf download.Copper and Copper Alloy Press-Connect Pressure Fittings.

10.2 Threading Tolerances

Nl1 threads shall be checked by use of a plug or ring gage in either standard or limit types. When gaging internal taper threads,

the plug gage shall be screwed hand-tight into the fitting. The reference point for gaging internal product-threads depends on the chamfer d iamelet. When the internal chamfer diameter exceeds the major diameter of the internal thread, the reference point shall be the bst thread scratch on the chamfer cone. Otherwise, when the internal chamfer diameter does not exceed the major diameter of the internal thread. the reference point shall be the end of the fitting. In gaging external taper threads, the ring gage shall be screwed hand-tight on the external thread. On the external thread, the ring gage shall be flush with the end of the thread.

Tolerance for an internal threaded end having an internal shoulder shall be from the gage reference point (notch) to one turn

small. Tolerance for an internally threaded end without a shoulder and for an externally threaded end shall be from one turn small to one turn large.

10.3 DesIgn of Threaded Ends

The wrenching section of internally threaded ends shall be polygonal, and the wrenching seclion of externally threaded ends shall

be furnished with either polygon or flats, at the manufacturer’s option.

11 ALIGNMENT

The maximum allowable deviation in the angular alignment of any end from the specified axis position shall be deg (I deg total).

See Fig. 3.

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