The threads in the neck and the dimensions of the neck decide the size of the closure to be use. So we must have a clear idea about the neck finishes. There are some common S.P.I specifications which must be considered
“H” dimension: High end of door. This is measure from the top of the neck to the point where the “T” diameter is extend down across the shoulder.
“S” dimension: Measured from above, finishes up the first thread. Size “S” is a key factor that determines the orientation of the closure to the bottle and the level of involvement of the thread between the bottle and the lid.
“I” Dimension: Inner diameter of bottle neck. Specifications require a minimum of “I” to provide enough space to fill the tube. Less bushings that can be lock with gaskets or gaskets, plugs and measuring equipment require a controlled “I” dimension to fit.
“T” dimension: Outside thread diameter. The tolerance range “T” determines the position between the bottle and the lid.
“E” dimension: Outside door diameter. The difference between the two dimensions “E” and “T” determines the thread depth.
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