About Neck Finishes

We interact with neck finishes everyday. What is a neck finish? The neck finish refers to the top section following the opening of a bottle, jar, or any other container with protruding threads that wrap around the outside of the container to securely fasten a matching cap.

The length and number of threads are specifically designed to securely seal different types of products. The threads also determine how the container will be sealed. The most common are continuous threads which require a twisting motion and other caps such as lugs only require a single motion to unlock. The different styles of neck finishes are commonly identified by two numbers separated by a hyphen or fraction (i.e 38-400 or 38/400) or a single number (i.e. 38mm). The first number is always in mm and refers to the outer diameter of the threads. Below is a short review of the most common neck finishes you may come across.

400 (continuous thread) A 400 neck finish consists of a single thread turn.

410 (continuous thread) A 410 neck finish consists of one and a half turns.

415 (continuous thread) A 415 neck finish consists of two thread turns, but the threads are thinner and neck is typically taller.

425 (continuous thread) A 425 neck finish consists of two thread turns, but is most commonly found on smaller capacity containers such as vials.

485 (continous thread) A 485 neck finish consist of one thread turn, but most commonly found on paragon glass jars. The finish can also take a 400 cap, but is used with spice caps.

430 (continuous thread) A 430 neck finish consists of one or two thread turns. The threads are also deeper than the standard 400 and 415 neck finish. The unique shape of the neck is commonly known as a buttress and is designed to help the user pour product with better accuracy.

DBJ (continuous thread) A DBJ neck finish features a ring beneath the threads that catches on to a detachable ring of a DBJ cap. When the end user unscrews the cap from the container for the first time, the ring will break off from the cap, making it tamper evident.

470 (continuous thread) A 470 neck finish consists of one thread turn and is commonly found on glass mayo jars. The threads of a 470 neck finish are deeper than a 400 finish.

2030 (lug) A 2030 neck finish consists of a single half turn twist. Continuous thread closures will not fit on lug finished closures. The 2030 are most commonly found on glass mayo or mason jars and are used for preserving food.

The listed above are only a few common neck finishes you may come across. There are many more types of neck finishes and even variations that have all been designed to accommodate specific caps. Contact us and speak with a packaging specialist today to find what kind of cap would work best for your product!