Abstract： ASME B16.29:2017 pdf download.Wrought Copper and Wrought Copper Alloy Solder-Joint Drainage Fittings — Dwv. 11 THREADED ENDS 11.1 General Fitting threads shall be right hand, conforming to ASME 81.20.1. They shall he American National Sta...

ASME B16.29:2017 pdf download.Wrought Copper and Wrought Copper Alloy Solder-Joint Drainage Fittings — Dwv.

11 THREADED ENDS

11.1 General

Fitting threads shall be right hand, conforming to ASME 81.20.1. They shall he American National Standard taper pipe threads (Nfl), except for slip-joint ends, which shall have Aniencan National Standard free-fitting straight mechanical pipe threads (NPSM).

11.2 Chamfer

All Internal threads shall be countersunk a distance not less than one-halt the pitch of the thread at an angle of approximately 45 deg with the axis of the thread. All external threads shall be chamfered 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.

11.3 Threading Tolerances

113.1 Internal Tlnads. Variations in Nfl internal threading shall be limited to one turn large or one turn small from the gaging

notch when using working gages. The reference point for gaging is the starting end of the fitting, provided the chamfer does not

exceed the major diameter of the Internal thread. When a chamfer on the internal thread exceeds this limit the reference point

becomes the last thread scratch on the chamfer cone.

11.3.2 External Threads. Variations in NP’!’ external threading shall be limited to one turn large or one turn small from the

gage face of ring when using working gages. The reference point for gaging is the end of the thread, provided the chamfer is not

smaller than the minor diameter of the external thread. When a chamfer on the external thread exceeds this limit, the reference

point becomes the last thread scratch on the chamfer cone

12 DESIGN OF THREADED ENDS

External and internal threaded ends of littings will be furnished with a polygon to facilitate installation.

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