What About the Numbers?

The first number represents the outer diameter (in mm) of the neck opening. The second number refers to the thread configuration and height of the neck. To see some of our most common narrow-neck finish dimensions, click on the numbers below:

This very common neck style features a single thread that just slightly overlaps and requires just a single rotation of the closure. 24-400 necks usually feature a bead (or band) of plastic at the base of the neck
Ideal for taller styles of closures, this common neck style offers more height between the shoulder of the bottle and the top of the threads. It also requires nearly two full turns of the closure in order to fully seal the package.
Perfect for pumps and sprayers, a 24-415 neck requires more than two full rotations to fully apply the closure. This is the tallest of the neck finishes that Alpha Packaging uses for its narrow-neck bottles.
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What About the Letters?

The first number represents the outer diameter (in mm) of the neck opening. The second number refers to the thread configuration and height of the neck. To see some of our most common narrow-neck finish dimensions, click on the numbers below:

“T” dimension is the outer diameter of the thread width.
“E” dimension is the outside diameter of the neck, not including the thread. To determine the depth of the threads, subtract “E” from “T” and divide by two.
“I” dimension is the inner diameter of the neck. Some filling equipment requires a minimum “I” for adequate clearance, and some closures and plugs also require a precise “I” dimension.
“S” dimension is the distance from the top of the neck finish to the top edge of the first thread. This helps determine the orientation of the closure to the bottle or jar.
"H” dimension is the total height of the neck finish, from the top of the neck to the shoulder or neck bead (as shown here).
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Special Necks, Including Alpha’s HDPE Straight Sided Canister Line

In addition to the Continuous Thread and J-Cap necks on the majority of our bottles, Alpha makes some stock bottles with special neck finishes.

For example, our HDPE Straight Sided Canister Line offers 11 bottles, each with three different 120mm neck finishes. Here’s what you need to know before ordering these bottles:

Illustration of Continuous Thread

Alpha's 120-400 Continuous Thread neck fits Deep-Skirt CT closures

Customers who want to use a 120-400 Deep Skirt Continuous Thread closure will prefer this new neck finish, which eliminates the visual gap between the Deep Skirt closure and the large ring at the top of the canister. Deep Skirt closures from Innovative Molding work very well with this new neck finish which features two full thread turns.

Pano Continuous Thread Illustration

120 Pano/Continuous Thread neck is ideal when you need a Tamper Evident closure

If you need a tamper-evident closure, you should order the 120-400 Pano/CT neck style which features a shrink bead to accommodate the Pano tear-strip closure. For information on Pano closures visit www.panocap.com. Traditional continuous thread closures will sit high on the bottle, so the bead beneath the threads may be exposed. To ensure proper fit of a 120-400 CT closure, we recommend that you purchase lined closures. Phoenix Closures Item #120-DCT-74 is a Continuous Thread option that works with this 1-3/4 turn thread configuration.

Illustration of Triple Lead Short

Triple Lead Short (TLS) neck fits a Deep-Skirt closure from Sho-Me Container

Alpha developed the “Triple Lead Short” (TLS) neck finish to accommodate customers who already have 120mm deep skirt closures from Sho-Me Container or Priority Plastics. The Triple Lead thread design engages the closure threads at three separate points.

We call this the Triple Lead Short because the threads have a short “S” dimension (the distance from the top of the threads to the top of the bottle).