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Packaging technology, Packaging glossary, Closures thread profile, Standard neck finishes, All neck finishes drawing, S.P.I. Specifications, Liner descriptions, Packaging glossary, Closures glossary, Guide to plastic resins, Plastic guidelines for cosmetics, Plastic guidelines for chemicals, Plastic bottle properties

Standard Guidelines for Bottle Finish Dimensioning...

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Standard Guidelines for Bottle Finish Dimensioning...

Cap and Neck Finishes

Screw thread cap sizes are generally expressed as two numbers. The first number refers to the cap diameter (in millimeters) and the corresponding Glass Packaging Institute (GPI)/Society of the Plastics Industry (SPI) finish diameter.

The second number refers to the height and thread configuration of the closure or finish. Below is a selection of commonly used caps and finishes.

S=Thread Start

H=Finish Height

T=Major Diameter

E=Minor Diameter

I=Hole Diameter

T - Outside diameter of the continuous thread

E - Outside diameter of the finish shaft excluding thread

I - The inside diameter of the finish at the smallest possible point

S - The distance between the top of the finish to the top of the thread

L - The distance between the top of the finish to the top of the transfer bead (optional)

H - Height from the top of the finish to the bottom where it intersects with the shoulder

W - The thickness of the transfer bead (optional)

Standard Plastic Finishes Most Commonly Used...


The diameter of Closures	Standard Neck Finishes

	( 1 turn of thread)	( 1.5 turn of thread)
	(Tall 2 turns thread)	(Short 2 turns thread)

Plastic Thread Forms...


	Plastic thread form finishes typically have a standard "M" style thread form, shown here. An "L" style can also be used but is not as common. The root dimension will vary depending on the threads per inch of the finish. Special thread forms can also be designed.

Recommended Application Torque (Inch / Pounds)

Cap Size	Glass	Plastic
20	8-12	10-12
24	10-15	12-15
28	11-17	13-17
33	13-20	16-20
38	15-23	19-23
43	17-26	21-26
45	18-28	23-28
48	19-29	24-29
53	21-32	27-32
58	23-35	29-35
63	25-38	31-38
70	28-42	35-42
89	26-53	44-53
100	40-60	48-60
110	45-65	55-65
120	48-72	60-72

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