The Z366-250-A15 is a 7-position 15 mL conical tube insert for the Hermle Z366-250 swing-out bucket on the Z366 / Z366-K chassis 4-place rotor — sold as a 2-pack. Each insert holds 7 × 15 mL conical tubes; the 4-bucket rotor configuration takes 2 packs (4 inserts) for full symmetric loading, delivering 28 × 15 mL conical tubes per cycle in swing-out geometry on the deep cold-chain Z366-K chassis (−2 °C at max speed). Sister insert to the Z366-250-B15 direct-fit bucket (40/cycle higher throughput) — pick A15 for moderate throughput and bucket-insert flexibility, B15 for highest 15 mL throughput.
Key Specifications
| SKU | Z366-250-A15 |
| Type | Tube insert — 7 × 15 mL conical |
| Pack quantity | 2 inserts per SKU (full 4-bucket configuration takes 2 units = 4 inserts) |
| Per-insert capacity | 7 × 15 mL conical tubes |
| Per-cycle throughput (full configuration) | 28 × 15 mL conical per cycle |
| Tube format | 15 mL conical Falcon-style (17 mm OD, 120 mm length) |
| Compatible bucket | Z366-250 swing-out bucket |
| Compatible rotor | Z366-250 4-place swing-out rotor |
| Compatible chassis | Z366, Z366-K (refrigerated), and -E voltage variants |
| Max. operating speed (with insert + tubes) | Per Z366-250 spec — 4,500 rpm at 3,780 × g maximum |
| Max. radius | 16.7 cm (0.0 cm radius correction — full radius preserved) |
| Temperature at max speed (Z366-K refrigerated) | −2 °C |
| Geometry | Swing-out (0–90°) — flat sediment surface |
| List price | $534 (2-pack) |
Compatibility & When to Order This SKU
Insert pairing — Z366-250 swing-out bucket only. Order this SKU when:
- Adding 15 mL conical workflow to an existing Z366 / Z366-K + Z366-250 install — order 2 units for full 4-bucket symmetric loading (28 tubes/cycle).
- Deep cold-chain 15 mL conical prep — when the workflow needs the Z366-K's −2 °C cold-chain integrity for cold-stable analyte preservation in 15 mL conical format.
- Mixed bucket-insert / direct-fit workflow — when the lab uses both the bucket-insert path (this A15) and the direct-fit path (Z366-250-B15) depending on per-cycle throughput needs.
- Replacement inserts if a current set is damaged or worn.
A15 vs B15 — Throughput Trade-Off
The Z366-250 rotor system offers two 15 mL conical workflow paths:
| Configuration | Per cycle | Approach |
| Z366-250-A15 (this SKU) | 28 × 15 mL conical | Bucket + insert (flexibility — bucket can hold other inserts too) |
| Z366-250-B15 | 40 × 15 mL conical | Direct-fit bucket (higher throughput, dedicated to 15 mL conical) |
Pick the A15 when the lab uses the bucket for multiple tube/bottle formats (the bucket can hold A10, A100, A20, A250, etc.); pick the B15 when 15 mL conical is the dominant workflow and throughput matters most.
Application Profile
4-bucket symmetric loading. All 4 buckets must use matching A15 inserts for symmetric balance.
Per-insert symmetric loading. Within each insert, the 7 conical tubes should be balanced symmetrically — pair tubes by mass.
Design Architecture
Deep cold-chain 15 mL conical clinical-research prep — patient sample fractionation, density-gradient prep, biobank aliquot prep at 28 tubes per cycle on the near-freezing cold-chain swing-out chassis.
Cell-culture pellet recovery in 15 mL — pelleting non-adherent cells from 15 mL suspension batches at deep cold-chain temperature for downstream-stable cell preparation.
Density-gradient prep in 15 mL — Ficoll, Percoll, sucrose-gradient prep where the swing-out flat-sediment geometry preserves gradient interfaces and the deep cold-chain integrity supports gradient stability.
Cold-stable protein prep at 15 mL — TCA, ammonium-sulfate, organic-precipitation in 15 mL conical at near-freezing temperature.
Mixed-format Z366-K core facilities — labs that handle multiple tube/bottle formats on the same chassis benefit from the bucket-insert approach over dedicated direct-fit buckets.
Educational and graduate-level teaching — molecular biology and clinical-tech curricula using 15 mL conical at moderate throughput on the deep cold-chain chassis.
Ordering & Configuration
4-bucket symmetric loading. All 4 buckets must use matching A15 inserts. Mixed-bucket configurations produce mass asymmetry.
Tube cap confirmation. All conical tubes must be securely capped before spinning at 4,500 rpm.
Z366-250-A15 ships as 2 inserts. 15 mL conical tubes are operator-supplied (commodity Falcon / Corning / equivalent formats). The Z366-250 bucket is sold separately.
Confirm at quote: bucket pairing (Z366-250 in inventory), chassis pairing (Z366 or Z366-K), tube format (15 mL conical Falcon-style), workflow throughput need (A15 at 28/cycle vs B15 at 40/cycle), pack count (2 packs for full 4-bucket configuration), and lead time.
Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the inserts.
Z366-250 15 mL conical workflow paths (Z366 / Z366-K chassis):
- Z366-250-A15 (this product) — 7 × 15 mL conical insert (28/cycle, bucket-insert flexibility)
- Z366-250-B15 — 10 × 15 mL conical direct-fit bucket (40/cycle, dedicated higher throughput)
Pick A15 for bucket-insert flexibility across multiple tube formats; pick B15 when 15 mL conical throughput is the dominant workflow driver.
