# 439/440 series — Packaging specification equivalence: neck finishes, corrugated grades and pallet standards

For 439/440 series, specification type is neck_finish; description is Deep-thread, heavy-duty finish, coarse thread or modified CT; primary dimension is Deep-thread, heavy-duty; secondary dimension is Coarse thread or modified CT; equivalence or compatibility note is Ensures robust sealing and durability for repeated use, recorded from its source on 2026-08-12.

- **Specification ID:** 439/440 series _(verified: appears in the quote below)_
- **Specification type:** neck_finish _(our reading, not quoted from the source)_
- **Description:** Deep-thread, heavy-duty finish, coarse thread or modified CT _(verified: appears in the quote below)_
- **Primary dimension:** Deep-thread, heavy-duty _(verified: appears in the quote below)_
- **Secondary dimension:** Coarse thread or modified CT _(verified: appears in the quote below)_
- **Equivalence or compatibility note:** Ensures robust sealing and durability for repeated use _(verified: appears in the quote below)_
- **Additional data:** Industrial containers, thick liquids _(verified: appears in the quote below)_

## What the source says

> 439 / 440 series | Deep-thread, heavy-duty | Coarse thread or modified CT | Industrial containers, thick liquids | Ensures robust sealing and durability for repeated use.

## Source

- https://evergreenresources.com/plastic-bottle-neck-finishes/

Last verified: 2026-08-12. Review by: 2028-08-11.
Part of [Packaging specification equivalence: neck finishes, corrugated grades and pallet standards](https://referencesource.org/packaging-material-specification-equivalence/).