15 mL Centrifuge Tubes, Screw Caps, HDPE, Blue — 300-3022-B20 | 1000/Bag | Caplugs® Evergreen

Transport Vial and 15 mL Centrifuge Tube Screw Caps with Sprockets, HDPE, Blue — 300-3022-B20 | 1000/Bag

Technical Narrative

The Caplugs® Evergreen is a blue HDPE screw cap with a sprocket grip skirt for 15 mL centrifuge tubes and 7 mL transport vials — the high-throughput variant of the 300-3010 plain blue cap (300-3010-B2N) with raised sprocket ridges on the skirt that provide tactile grip for consistent one-hand finger torque. Sprocket rings on the cap skirt provide a tactile grip surface for consistent one-hand finger-torque engagement — reducing cap cross-threading in high-speed specimen processing where caps are applied and removed rapidly with gloved hands. The sprocket profile also enables automated cap torquing in tube-capping instruments used in high-throughput clinical and biorepository workflows.

The sprocket grip is particularly valuable in three scenarios: (1) high-throughput clinical laboratory workflows where tubes are capped and uncapped rapidly with nitrile-gloved hands — the sprocket profile prevents glove slip that can cause under-torqued caps and incomplete closure; (2) automated tube-capping instruments where the sprocket ridges engage the torque head for consistent, repeatable closure force across all capped tubes in a batch; (3) frozen biorepository tube retrieval where HDPE caps at -80°C can be harder to grip with gloved hands — the sprocket provides the tactile purchase needed for torque removal without tube damage. Blue color mirrors the CLSI H3 citrate anticoagulant convention, designating citrate and coagulation specimen tube batches in color-coded processing workflows.

At $87.90 per 1000/Bag — $0.0879 per cap — the carries a $20.40/1000 premium over the plain blue cap (300-3010-B2N, $67.50) — justified when grip-torque consistency, automated capping compatibility, or gloved-hand throughput are workflow priorities. For standard bench-top capping without automation, the plain 300-3010-B2N delivers equivalent thread performance at lower cost.

Technical Specifications — Caplugs® Evergreen

Sprocket Cap Application Compatibility —

The sprocket cap provides the same HDPE thread compatibility as the 300-3010 plain caps with the added grip advantage of the sprocket skirt for high-throughput and automated workflows:

Sprocket caps are compatible with the same tube formats as 300-3010 plain caps. The sprocket skirt adds grip but does not change the thread specification. Request a free sample to confirm fit.

Chemical Resistance — High-Density Polyethylene (HDPE)

HDPE provides broad chemical resistance, cryo stability, and autoclave compatibility for demanding tube cap applications.

300-3022 Sprocket Cap vs 300-3010 Plain Cap

Same HDPE thread, same tube compatibility — sprocket adds tactile grip:

Laboratory Applications

The serves high-throughput clinical specimen processing programs capping citrate coagulation tubes; automated tube-capping instrument workflows requiring sprocket-compatible caps; biorepository programs retrieving frozen tubes at -80°C where improved grip on cold caps reduces tube damage; and any workflow where consistent one-hand torque closure on 15 mL centrifuge tubes or transport vials is a priority.

U.S. Manufacturing, Quality & Institutional Procurement

Every Caplugs® Evergreen lot is precision-molded at our California manufacturing facility and subject to rigorous dimensional inspection. We supply reference laboratories, hospital systems, biotech firms, and federal procurement offices under institutional pricing programs with blanket-order support and same-day shipping. Request a free sample below to validate fit before committing to volume.

Frequently Asked Questions — Caplugs® Evergreen

What is the difference between the sprocket cap and the plain blue cap (300-3010-B2N)?

Both are blue HDPE screw caps with the same thread specification for 15 mL centrifuge tubes and 7 mL transport vials. The difference is the skirt profile: 300-3010-B2N has a smooth skirt; has raised sprocket ridges that provide tactile grip for one-hand finger torque. The sprocket grip improves closure consistency in high-throughput gloved workflows, automated capping, and frozen tube retrieval at -80°C. Cost: 300-3010-B2N $67.50/1000; $87.90/1000.

Is the sprocket cap compatible with automated tube-capping instruments?

Yes. The sprocket ridges on the are designed to engage the torque head of automated tube-capping instruments, providing consistent, repeatable closure force across all tubes in a batch. This eliminates the variability in hand-torque force that can result in under- or over-torqued caps in manual capping workflows. Confirm sprocket-to-instrument head compatibility with your specific capping instrument before bulk purchase.

Why is the sprocket cap only available in blue — are other colors available?

The 300-3022 sprocket cap range currently includes blue only. Blue was selected as the first sprocket color because coagulation and citrate specimen batches — the primary use for blue-top tube caps — are common in high-throughput clinical laboratories where the grip advantage of the sprocket profile provides the most workflow value. For other colors with sprocket grip, check with Caplugs® Evergreen for current availability. For plain caps in all 9 colors, see the 300-3010 family.