Screw Caps for Microtubes, No O-Ring, Polypropylene — 6 Colors, 1000/Pack
These Screw Caps for Microtubes from Globe Scientific provide secure closure for self-standing screw-cap microtubes used in sample archiving, aliquoting, and DNA/RNA storage. Six color options enable rapid visual sorting across protocols, while the molded polypropylene construction holds up to repeated freeze–thaw handling at the bench.
Technical Specifications
| Product Type | Screw Cap for Microtube (no O-ring) |
| Volume/Size | Standard microtube thread, fits compatible screw-cap microtubes |
| Material | Polypropylene (PP) |
| Closure/Cap | Threaded screw cap, no O-ring (no integral seal) |
| Sterility | Non-sterile |
| Pack Size | 1000 caps per pack |
Available Colors
| Yellow — Bag of 1000 | 111672Y | $127.90 |
| White — Bag of 1000 | 111672W | $127.90 |
| Red — Bag of 1000 | 111672R | $127.90 |
| Green — Bag of 1000 | 111672G | $127.90 |
| Clear — Bag of 1000 | 111672C | $127.90 |
| Blue — Bag of 1000 | 111672B | $127.90 |
Applications
- Color-coding sample sets by patient, study arm, or assay condition
- Capping screw-cap microtubes for long-term -20°C or -80°C archiving
- Securing aliquots of nucleic acid, protein, or buffer stocks
- Replacement caps for tubes opened and reclosed across multiple workflows
- Organizing biobank and repository sample inventories
- Labeling-by-color schemes in high-throughput genomics labs
Quality & Procurement
labsupplies.com is an authorized Globe Scientific dealer shipping from US inventory. Each pack carries a lot number, supporting traceability requirements for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available on request for volume orders.
Frequently Asked Questions
Do these caps include an O-ring seal?
No. These are no-O-ring screw caps. For applications requiring a liquid-tight or sample-integrity seal, choose O-ring style caps with matching microtubes instead.
How many caps come in each pack?
Each pack contains 1000 caps. All six colors share the same 1000-count pack size and the same per-pack list price of $127.90.
Are the caps autoclavable?
The caps are molded from polypropylene, which generally tolerates standard autoclave cycles. Validate against your tube and protocol, since repeated cycling can affect thread fit over time.
Why choose color-coded caps over a single color?
Color coding speeds visual sorting and reduces transcription errors when sample sets, study arms, or assay conditions must be distinguished at a glance during high-throughput handling.