Abstract： ASME B16.50:2021 pdf download.Wrought Copper and Copper Alloy Braze-Joint Pressure Fittings. 10.1 Countersink or Chamfer All Internal threads shall be countersunk a distance no less than one-half the pitch of the thread, at .in angle of app...

ASME B16.50:2021 pdf download.Wrought Copper and Copper Alloy Braze-Joint Pressure Fittings.

10.1 Countersink or Chamfer

All Internal threads shall be countersunk a distance no less than one-half the pitch of the thread, at .in angle of approximately

45 deg with the axis of the thread. All external threads shall be chamlered at an angle of 30 deg to 45 deg from the axis.

Countersinking and chamfering shall be concentric with the threads.

The length of threads shall be measured to include the countersink or chamfer.

10.2 Threading ToLerances

Tapered pipe threads (N PT) shall be checked by use of plug or ring gages in either standard or limit types. When gaging Internal

taper threads, the plug gage shall be screwed hand-fight Into the fitting. The reference point for gaging Internal product threads depends on the chamfer diameter. When the internal chamfer diameter exceeds the ma)or diameter of the Internal thread, the

reference point shall be the last 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 he flush with the end of the thread.

Tolerance for an internally 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 brge,

10.3 Design of Threaded Ends

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

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

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