1 mL Quartz Screw-Top Tube: Allowing for a Long, Narrow Body

This is a useful configuration to discuss when the container must extend into a narrow position while the closure remains accessible. The small nominal capacity does not describe how far the tube reaches or how it should be supported.

In this guide: Configuration · Design comparison · Define the inserted section and the exposed section · Keep all length marks tied to their endpoints · Small volume still needs an access plan · Retaining the M10 feature in a custom version · Enquiry

The configuration discussed here

What changes from the simpler form?

The narrow screw-neck tube retains a long sample-access route while adding a closure above it. Compared with a plain open tube, the closed envelope and the exposed neck become additional fit requirements.

Define the inserted section and the exposed section

For example, a support may accept the thin tube while the wider threaded end stays above it. Mark the insertion depth and the stop surface on a section of the actual support. Then identify the exposed length needed for opening and withdrawal.

The neck shoulder should not become an accidental support point. If it is intended to locate the tube, its contact and allowable handling need a specific review. A long narrow body also needs a handling route that avoids using the cap as an unqualified lifting feature.

Keep all length marks tied to their endpoints

A drawing can contain several valid lengths because they describe different parts of the assembly. The 153, 170 and 175 mm references here should remain separate until their endpoints are agreed. Choosing the smallest number for a fit check would hide the longer assembly.

For a custom request, use one datum and dimension the body, inserted portion and closed height from clear surfaces. Mark any uncertainty on the enquiry sketch instead of combining different length references into one value.

Small volume still needs an access plan

State how the sample is introduced and recovered. A tool may need to pass through the neck and reach along the narrow body, so give its outside diameter and usable length. The 1 mL label is not a demonstrated minimum working or recoverable volume.

Describe the intended fill position and whether the tube is used upright, supported horizontally or in another arrangement. That information belongs to the application review; the reference tube does not establish suitability for every orientation or instrument.

Retaining the M10 feature in a custom version

If an existing cap must be kept while the tube length changes, provide the actual cap or a mating drawing. M10 identifies a nominal thread feature, not every seat, engagement or liner detail. The complete closing arrangement still needs to match.

The project drawing should separate the neck interface from the thin-body envelope and state which dimensions are critical. Proposed fit, closure or handling checks are agreed for that design, not assumed from the thread designation.

Structure reference and specification points

Download the structure reference (PDF)

Will any M10 cap fit this tube?

Do not assume so. The mating thread details, engagement, neck-end contact and any liner must be checked. Send the actual cap reference or a drawing when interchangeability is required.