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Inserts for 8 mm vials (ND8)

Glass micro-inserts for 8-425 screw vials: a 250 µl flat-bottom insert (31 × 5 mm), a 150 µl conical insert (31 × 5 mm) and a 150 µl insert with conical interior and polymer feet (29 × 5 mm).

How to choose

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Compare inserts for 8 mm vials (nd8)

Rows that differ are in bold.

An insert is a small glass tube that sits inside a standard 2 ml vial. It keeps a small sample within reach of the autosampler needle, so you can inject from 150 to 300 µl without wasting sample.

Step 1: Match the insert to the vial neck

VialInsert sizeVolumes in this range
8-425 screw vials31 × 5 mm or 29 × 5 mm150 µl and 250 µl
9 mm short-thread vials31 × 6 mm or 29 × 5.7 mm250 µl and 300 µl

The insert has to sit straight in the vial neck. An insert that is too narrow can tilt and the needle may hit the glass; one that is too wide will not go in. The normal vial cap closes over the insert.

Step 2: Bottom shape

TypeChoose it when
Flat bottomYou want the largest volume and the lowest price per piece
Conical bottomThe sample is very small: liquid collects in the tip, so the needle can draw almost all of it
Conical interior with polymer feetYou want a conical insert that stands on plastic feet, which keep it centred in the vial and cushion it
Flat, conical and conical with polymer feet inserts inside a 2 ml vialFlat bottomConical bottomConical, polymer feetMost volume, lowest priceDraws almost every dropCentred and cushioned
Insert bottom shapes, drawn inside a 2 ml vial

Step 3: Needle depth

Check the needle height setting on your autosampler. The needle must stop above the bottom of the insert; with a conical insert it can go lower than with a flat one. Run a test injection with a blank before a sequence.

Autosampler needle stopping just above the bottom of an insertNeedle stops hereJust above the insert tipRun a blank firstCheck the needle height settingon your autosampler before a sequence.
Set the needle to stop above the insert bottom

One-piece alternative

If you prefer not to assemble inserts, the 9 mm and 11 mm vial ranges include 0.3 ml vials with a base-bonded micro-insert built in.

Inserts are sold in packs of 100.

Questions buyers ask

Do these inserts fit 9 mm short-thread vials?

No, they are sized for the narrower 8-425 neck. For 9 mm vials use the 9 mm insert range (31 × 6 mm or 29 × 5.7 mm).

What do the polymer feet do?

They hold the insert centred in the vial and cushion it at the base.

Which 8-425 insert holds the most sample?

The 250 µl flat-bottom insert, 31 × 5 mm.