Neck finish guide
A working reference for reading neck finish designations and matching a closure to a container before a fit trial rather than after one.
A neck finish designation such as 38-400 encodes two things: the nominal diameter in millimetres and the thread style. Getting either wrong produces a closure that appears to fit and then fails on torque, on seal or in distribution.
This guide is in preparation and will cover the common designations, the dimensional callouts that matter, and how to specify a finish when you are moving a product between container suppliers.
Reading the callout
What the two numbers in a finish designation actually specify.
Dimensions that matter
The measurements that decide fit, and the ones that do not.
Switching suppliers
How to specify a finish when moving a product between container sources.
Related
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API Sourcing Guide
Qualifying an API source, from sample to second-source approval.
DMF vs CEP
Which regulatory route applies to your filing, and where.
Lead Time and Incoterms
Where the time actually goes, and who carries which risk.
Request a Quote
Send the specification and the volume. We come back with pricing, lead time and Incoterms within two business days.