#closure-compatibility

Screw cap fit cover with thread, diameter and grip icons beside a rubber-lined capping chuck, white cap and bottle neck

Bottle neck finishes

Screw Cap Thread Fit & Capping Chuck Grip Diameter Selection

Match a screw cap to its bottle thread, measure the outside grip diameter, and choose capping chuck geometry and insert material for consistent tightening and release.

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Glass dropper bottle assembly with elastomeric bulb, threaded collar, and glass pipette

Bottle neck finishes

Glass Dropper Bottle Closure and Neck Finish Specs

Match a glass dropper bottle's full neck finish, distinguish pipettes from reducers and plain caps, and verify the sealing interface before approving an assembly.

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