F1498, Section 4.5, indicates the term should be pilot to include internal and external threads, instead of counterbore. 4.5 Thread Starts-Molded Internal and external molded threads shall begin with a taper or blunt start. A pilot shall be provided from the face of the fitting and at the entering end of external threads; it shall have a length to the start (flank) of the first thread, equal to to the width of the thread pitch, 1 to 1 thread pitch to the centerline. Figures 2b and 2c show the pilot length for taper and blunt starts.
Coupling sockets (for plastic pipe); Cross-threaded sockets (for plastic pipe); Dimensions--plastic materials/applications; Elbow sockets (for plastic pipe); Plastic pipe/tubing/fittings; Reducer bushings sockets (for plastic pipe); Symbols for dimensions; Tapered sockets (for plastic pipe); Tee sockets (for plastic pipe); Thermoplastic pipe/tube/fittings;
Citing ASTM Standards
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