Thermo Scientific Centrifuge Tube Screw Caps with O-Ring Total of 500 Caps

Thermo Scientific Screw Cap Microcentrifuge Tube Caps – Natural Polypropylene, Integrated O-Ring, Knurled Edge, Non-Sterile, PCR Ready (MPN: 3471)

The Thermo Scientific 3471 (also cataloged as 3471PK / 3471-CS) is a premium, molecular-biology-grade replacement closure precision-engineered for threaded microcentrifuge tubes and screw-cap microtubes. Molded from high-purity natural virgin polypropylene, these heavy-duty caps incorporate a high-retention internal elastomeric O-ring gasket. When threaded down, the O-ring establishes a resilient, gas-tight mechanical seal that withstands extreme relative centrifugal forces and blocks ambient moisture migration. Designed with a ribbed, knurled outer perimeter for secure, slip-free handling during high-throughput benchwork, these non-sterile caps are certified PCR ready and fully autoclave-safe for critical sample banking loops.

Technical Performance and Design

• Elastomeric O-Ring Seal: Outfitted with a high-performance internal O-ring gasket that creates a robust mechanical barrier. This configuration counters severe internal vapor pressure spikes and prevents liquid tracking during extreme-heat boiling steps or long-term deep freezing.

• Knurled Outer Perimeter Grip: The vertical ribbed exterior rim provides excellent surface friction. This structural profile enables fast, non-slip manual tightening or effortless capping and uncapping routines when wearing damp nitrile laboratory gloves.

• PCR Ready Purity Profile: Manufactured under automated cleanroom conditions to secure strict chemical purity metrics. Every batch is validated and certified free of detectable RNase, DNase, human DNA, and molecular PCR inhibitors right out of the bulk packaging.

• Broad Thermal Architecture: Fabricated from laboratory-grade polypropylene designed to resist thermal stress and material embrittlement, performing reliably from ultra-low vapor-phase freezing down to minus 80 C up to steam autoclaving at 121 C.

Product Specifications

• Catalog Number / MPN: 3471 (Cross-listed as 3471PK / 3471-CS / 3471B-PK)

• Manufacturer / Brand: Thermo Scientific

• Product Type Closure: Standard Threaded Screw Cap with O-Ring (Non-Tethered Design)

• Color Silhouette: Natural / Clear

• Material Composition: Premium Virgin Polypropylene (PP) Cap / Synthetic Elastomer O-Ring

• Sterility Metric: Non-Sterile (Certified PCR Ready and fully autoclavable for sterile workflows)

• Compatible Tube Formats: Fits standard Thermo Scientific screw-cap microcentrifuge tubes (0.5 mL, 1.5 mL, and 2.0 mL variants)

• Standard Case Configuration: Case of 5000 Caps total (Often distributed as smaller wholesale packs of 500)

Key Benefits and Applications

• High-Throughput Bio-Banking: The benchmark closure choice for securing rare genomic templates, active enzyme master mixes, and clinical protein isolates inside low-temperature mechanical freezers.

• Centrifugal Safety Assurance: Threaded assembly stays locked tight under extreme centrifugal loads, completely eliminating the sudden pop-open hazards linked to traditional friction-fit snap caps.

• Volatile Solvent Preservation: The compressed O-ring gasket minimizes evaporation headroom losses, protecting highly volatile reagents, organic extraction phases, and standard dilution lines from concentration drift.

• Streamlined Capping Automation: Uniform technical exterior dimensions conform to industry standards, supporting smooth interactions with automated capping workstations and manual tube racks.

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