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Screw Caps for Tubes with External Thread

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Securely seal your storage tubes

Preserve the integrity of your samples with Micronic screw caps!

Micronic Screw Caps for externally threaded tubes provide a secure closure for long-term sample storage at ultra-low temperatures and securely seal tubes during transportation. The caps are available in nine different colors: grey, yellow, orange, red, light green, blue, white, purple, and light blue for 96-format and grey, yellow, orange, red, light green, blue, and transparent for 48- and 24-format tubes.

In addition to the standard Screw Cap for Tubes with External Thread, NBS Scientific also offers the Screw Cap IG that has an improved gripping for both manually and automated handling, the newly designed lead-in on top of the screw cap ensures a better tube placement and the lower height makes storage (without rack cover) in automated stores more efficient.

Product features

Optimal seal quality

The screw caps for externally threaded tubes have a triple start thread for optimal sample storage. These screw caps are designed with a unique lock when sealed to prevent screw caps from being overtightened.

Tube Compatibility

The externally threaded screw caps are compatible with 96-well (0.30ml, 0.40ml, 0.75ml, 0.80ml and 1.40ml), 48-well (1.00ml, 2.00ml, 3.00ml and 4.00ml), and 24-well (1.50ml, 3.00ml, 3.50ml and 6.00ml) format tubes.

Automation friendly

The screw caps are designed specifically for automated processes, like screw cap recappers.


The internally 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 7.0mm (standard Screw Cap), 5.8mm (Screw Cap IG)
  • Temperature range Vapor phase LN2 to +100°C
  • Available gamma irradiated, (15 kGy avg.) or EtO 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. "

I experience NBS Scientific as an excellent partner with pleasant employees. I have good contact with them.

Charles River Laboratories

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Want to learn more about the externally threaded screw caps? Eager to request a free sample? Contact us today with your questions.

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Product downloads

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  • Caps for Sample Storage Tubes Download

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The Micronic Screw Caps provide a secure closure for long-term sample storage at ultra-low temperatures or a safe sealing during the transportation of your samples.
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