The extraordinary strength, safety and reliability of our Screw-Cap tube lets you perform procedures that simply can't be done with other tubes. Spin it, store it, transport it (even by air).
Boil it, irradiate it, immerse it in the vapor phase of liquid of liquid nitrogen - it'll stand up to the test! Inside the srew cap, our ethylene propylene O-Ring forms a secure, leakproof seal. Our screw cap's square threads won't strip - and they're on the outside of the tube, so you minimize the risk of contaminating your sample - or letting it contaminate you.
Our Screw-Cap tube is ideal for any sample processing or storage application imaginable - and especially for working with valuable or hazardous cells and materials.

• Sample Integrity. O-Ring creates a positive seal that prevents leaking during processing, storage or transport. Tube is made of inert virgin-polypropylene copolymer, to minimize the risk of altering samples.
• Universal Use. Accommodates all fixed angle head microcentrifuges (0.5mL and 2.0 mL upright models require adapter Cat. No. C13734-35). Will withstand maximum G-forces of all current microcentrifuge instruments.
• Safe and Reliable. External threads minimize contamination, material hangup and loss. Screw cap is made of the same material as tube, for extra protection.
• Sturdy and Reuseable. Ideal for freezer storage, boiling, autoclaving and irradiation.
• Convenient. Molded ridges on tubes match serrations on racks (Cat. No. C13734-36), so tubes may be opened with one hand. Upright models stand without a rack. Seamless, conical design lets you extract all of sample with pipette or syringe. Transparent polymer lets you see your sample clearly.
• Color-Coded. O-Ring screw caps available in 10 colors.