# 20-400 — Packaging specification equivalence: neck finishes, corrugated grades and pallet standards

For 20-400, specification type is neck_finish; description is 20 mm neck, 400 series (1 thread turn); primary dimension is T max 19.89 mm, T min 19.48 mm; secondary dimension is E max 17.75 mm, E min 17.35 mm; equivalence or compatibility note is 1 Thread turn, recorded from its source on 2026-08-12.

- **Specification ID:** 20-400
- **Specification type:** neck_finish _(our reading, not quoted from the source)_
- **Description:** 20 mm neck, 400 series (1 thread turn)
- **Primary dimension:** T max 19.89 mm, T min 19.48 mm
- **Secondary dimension:** E max 17.75 mm, E min 17.35 mm
- **Equivalence or compatibility note:** 1 Thread turn
- **Additional data:** 400H max 9.08 mm, 400H min 9.04 mm; S max 1.32 mm, S min 0.56 mm; I min 10.26 mm; 8 threads/in.

## What the source says

> 20 | 19.89 | 19.48 | 17.75 | 17.35 | 9.08 | 9.04 | 14.45 | 13.69 | 19.23 | 18.46 | 1.32 | 0.56 | 10.26 | 8

## Source

- https://www.contapack.com.au/SPI-Neck-Finishes.html

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/).