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Thermo Scientific™ Screw Cap Microcentrifuge Tube Caps

Prevent leakage under demanding conditions. These screw-cap tube caps with o-rings are optimized for secure short-term storage in low temperatures.

Manufacturer:  Thermo Scientific™ MB3471MIXS

 View more versions of this product

Catalog No. 14-755-341



Thermo Scientific™ Screw Cap Micro Tube caps with O-ring are designed to create a secure seal with the Thermo Scientific micro tube providing Pure Protection for sample preparation, transfer and storage applications.  
Tethered and non-tethered cap versions are available in a rainbow of colors.

Non-Sterile is free of Rnase/Dnase, DNA, Pyrogen & Endotoxin
Sterile E-Beam is free of Rnase/Dnase, DNA, Pyrogen, Endotoxin, ATP, PCR Inhibitor
100% virgin polypropylene resin specifically selected for high clarity and biologic applications
O-ring design, thickness and material selection have been optimized to provide protective features for maximum sealing ability, biologic interaction and temperature capability. The black colored O-ring is made from EPDM
Knurled caps improve grip when opening and closing tube
Frosted cap writing pad for easy product marking and identification
Color caps offered in multiple color options ideal for separating, coding and tracking samples. Amber colored caps ideal for UV protection of 1.22% transmittance between 220 and 500nm
Tethered caps remain attached to the sample tube but can rotate completely for convenience--the tethered screw cap is the solution when it is important to maintain the same cap with the same tube. Non-tethered caps available
RCF range from 18,000 to 25,000 x g
Temperature Range -80°C to +95°C. Short term storage in      -80°C, -20°C, dry ice and wet ice. Short term storage in vapor phase LN2 and suitable for a quick dip flash freeze in LN2
Torque Manual/Hand Torque: Standard: 0.125 lbsf.in to 2.5 lbsf.in; Metric: 1.412 Ncm to 28.24 Ncm.
Torque Automated/Robotic Torque Standard: 1.312 lbsf.in to 2.5 lbsf.in; Metric: 14.83 Ncm to 28.24 Ncm



100% Virgin Polypropylene (Cap), Ethylene Propylene Rubber Diene Monomer (O-ring)
500 x pk, 10 pk x cs, 5000 x cs. Single Bagged. ZipLock bag.
Low Nucleic Acid and Protein Binding & Low Enzyme Inhibition
Cold Storage: -80° to +95°C. Liquid Nitrogen: Short term Vapor Phase & Quick Flash Freeze acceptable, not recommmended for LN2 submersion storage
25,000 x g
Screw Cap with O-ring, Mix, E-Beam Sterile, cap only no tube
Mixed Colors include: Blk/Blue/Green/Nat/Org/Pink/Red/Violet/White/Yel. AMBER not included.
Sterile Electron Beam, SAL 10-6 Free of: Rnase/Dnase, DNA, Pyrogen, Endotoxin, Bioburden, ATP & PCR Inhibitor
Manual/Hand Torque: Standard: 0.125 lbsf.in to 2.5 lbsf.in; Metric: 1.412 Ncm to 28.24 Ncm. Automated/Robotic Torque Standard: 1.312 lbsf.in to 2.5 lbsf.in; Metric: 14.83 Ncm to 28.24 Ncm


  • Order your sample pack today! It includes 0.5mL, 1.5mL, and 2.mL tubes with 11 tethered and 11 color closure options. Sample packs are available in these color choices: natural, amber, or natural and amber.


Limited warranty period: Subject to all warranty requirements and exclusions set out in our Terms and Conditions of Sale, this product is warranted from the date we ship the product and for ninety (90) days thereafter. Disclaimer to internal research use restriction: Any restrictions on the purchaser to utilize the product(s) for internal research purposes only does not apply to the product(s) on the web pages associated with this statement.
Screw cap micro tubes and caps are not recommended for autoclave. Sterile options available.
Not intended to submerge and store in liquid phase LN2.