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Screw Caps External Thread

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Securely seal your storage tubes

Preserve the integrity of your samples with Micronic screw caps

The color range of Micronic's externally threaded screw caps: grey, light green, blue, red, orange, yellow

Micronic’s externally threaded screw caps securely seal tubes for long-term sample storage at ultra-low temperatures. To meet the diverse needs of different researchers, Micronic offers a range of sealing solutions. Externally threaded tubes can be sealed with standard screw caps for tubes with external thread—caps that are available for the following tubes sizes: 0.30ml, 0.75ml, and 1.40ml (96-well), 1.00ml and 4.00ml (48-well), and 3.50ml (24-well).

A Micronic 96-well format rack with lid of push cap tubes in freezer

Product features

Optimal seal quality

Externally threaded screw caps have a triple-start thread for optimal sample storage and are designed to lock when sealed to prevent over tightening.

Tube Compatibility

The externally threaded screw caps are compatible with 96-well (0.30ml, 0.75ml, and 1.40ml), 48-well (1.00ml and 4.00ml), and 24-well (3.50ml) tubes.

Automation Friendly

The externally threaded screw caps are designed specifically for automated processes and are available in transparent and six different colors.


The externally threaded screw caps resist chemical solvents. All caps are produced in a class 7 clean room and are RNase/DNase and Pyrogen free.

  • Material Polyethylene
  • Cap height 7.0 mm (96-, 48-, and 24-format)
  • Temperature range Vapor phase LN2 to +100°C
  • Available in 6 different colors
  • Available sterile, gamma radiated, (15 kGy avg.) or Et0 treated
  • Available pre-capped on Micronic screw cap tubes

Satisfied customers

That's why we do it

"At NBS Scientific I got quick and reliable responses to questions and appointments. All advice and attention was expertly given. We've been happily working together for over 2 years now. "

The Charles River Labs logo
Charles River Laboratories

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Product downloads

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