PCO 1881 and PCO 1810 Bottle Neck Go No-Go Gauge (28 mm PET) - Concept, not print-tested

Model Overview & Print Notes

A flat pocket gauge for quick checks of 28 mm PET bottle necks (PCO 1881 and the older, taller PCO 1810 finish). - GO hole (27,75 mm): a good thread outer diameter (T) should pass. - NO GO hole (27,15 mm): a good thread should NOT pass (undersize check). - RING hole (33,6 mm): the support ring should pass with little play. - Two labelled height steps, 17 mm (PCO 1881) and 21 mm (PCO 1810): compare against the neck height from top to support ring. Reference dimensions from public sources: - PCO 1881: thread T 27,40 mm (plus or minus 0,13), support ring 33,0 mm, height 17,00 mm, pitch 2,7 mm. - PCO 1810: thread T 27,43 mm (plus or minus 0,13), support ring 33,00 mm (plus 0,38), height 21,00 mm, pitch 3,18 mm. Sources: Alcoa PCO 1810 neck finish specification drawing (1998 revision); Multi Design Packaging neck finish glossary (GME 32,03 and GME 32,04); Gotmar PCO preform and closure datasheet; XEM Studio PET bottle neck reference sheet. The ISBT PCO 1881 master drawing itself was not accessible. Hole sizes include print clearance. Status: CONCEPT, NOT PRINT-TESTED. Printers vary, so verify printed holes with a caliper before use. Not a certified measuring tool. Designed by Anton Klitin, CAD engineer (CadQuery, FreeCAD). Open to freelance CAD work. License: CC BY 4.0

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