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Parker 75: 12.8 cm long: 10.7 mm diameter: Parker Sonnet: 13.3 cm long: 11.0 mm diameter: Parker Duofold Centennial: 13.7 cm long: 13.2 mm diameter: Parker Duofold International: 13.1 cm long: 11.7 mm diameter: Pelikan 400: 12.6 cm long: 12.2 mm diameter: Pelikan M600: 13.3 cm long: 12.7 mm diameter: Pelikan M800 : 14.1 cm long: 13.5 mm diameter: Sheaffer Legacy : 13.8 cm long
For all dimensions se corresponding reference letters in table. Angle between sides of thread is 60 degrees. Taper of thread on diameter is 3/4 inches per foot. Angle of taper with centerline is 1Â° 47' 24 (1.7899Â°). The basic maximum thread height, h of the truncated thread is 0.8 x (pitch of thread). The crest and root are truncated a minimum of 0.033 x (pitch) for all pitches.