Types of Caps
Continuous Thread finish is the most common closure. It has a continuous single spiral around the neck of the container.
Lug finish consists of several tapered ridges designed to mate and require only a partial turn to seal the cap.
Closures have two measurements: diameter and finish (i.e. 38/400). The first number of the closure size refers to the inside closure diameter (or outside bottle neck finish diameter) in millimeters. The second number, which is designated by industry standards, specifies other details of the finish dimensions, such as the number of threads and consequently the height of the finish.
To Measure Cap Diameter:
Place cap along upper ruled edge of page as shown. Read from one side of inner wall to the opposite side of inner wall of the cap to find diameter.
To Measure Finish Diameter of the Bottle:
Place finish along upper ruled edge of page as shown. Read from outer edge of thread on one side to outer edge of thread on opposite side of finish to find diameter.
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