5.3 Die (Orifice):
5.3.1 Standard Die—The outside diameter of the die shall
be such that it will fall freely to the bottom of the hole in the
cylinder. The orifice of the die shall have a smooth straight bore
2.095 6 0.005 mm in diameter and shall be 8.000 6 0.025 mm
in length (see Fig. 2). The bore of the orifice and its finish are
critical. It shall have no visible drill or other tool marks and no
detectable eccentricity. The bore of the orifice shall be manufactured
by techniques known to produce finishes approximately
12 rms or better in accordance with ANSI B46.1.