The Z366-250-A57 is a 14-position 1.8–7 mL Vacutainer-style pediatric blood 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 14 × pediatric / small-volume Vacutainer tubes; the 4-bucket rotor configuration takes 2 packs (4 inserts) for full symmetric loading, delivering 56 × 1.8–7 mL Vacutainer tubes per cycle — the highest per-cycle pediatric / small-volume blood-tube throughput in the Z366-250 swing-out family. The deep cold-chain capability of the Z366-K chassis (−2 °C at max speed) supports cold-stable pediatric and clinical-research blood prep workflows.
Key Specifications
| SKU | Z366-250-A57 |
| Type | Tube insert — 14 × 1.8–7 mL Vacutainer-style |
| Pack quantity | 2 inserts per SKU (full 4-bucket configuration takes 2 units = 4 inserts) |
| Per-insert capacity | 14 × 1.8–7 mL Vacutainer-style tubes |
| Per-cycle throughput (full configuration) | 56 × 1.8–7 mL Vacutainer tubes per cycle |
| Tube format | 1.8 mL, 5 mL, or 7 mL clinical Vacutainer-style (~13 mm OD, 75–100 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 pediatric / small-volume clinical blood-tube workflow to an existing Z366 / Z366-K + Z366-250 install — order 2 units for full 4-bucket symmetric loading (56 tubes/cycle).
- Institutional pediatric clinical-blood-component prep at scale — hospital pediatric labs and pediatric clinical-research workflows that batch many small-volume samples per cycle.
- Deep cold-chain pediatric clinical workflows on the Z366-K refrigerated chassis at near-freezing temperature.
- Replacement inserts if a current set is damaged or worn.
Application Profile
Highest small-volume Vacutainer throughput on Z366-250. 56 × 1.8–7 mL Vacutainer tubes per cycle is the highest per-cycle small-volume blood-tube throughput on the Z366-250 swing-out platform — sized for hospital-pediatric and large-cohort clinical-research workflows where pediatric specimen volume is substantial.
Tube format flexibility. The 13 mm OD, 75–100 mm length envelope accommodates 1.8 mL, 5 mL, and 7 mL Vacutainer-style tube formats — a single insert SKU serves the typical pediatric and small-volume adult tube range.
4-bucket symmetric loading. All 4 buckets must use matching A57 inserts for symmetric balance.
Design Architecture
Institutional pediatric clinical-blood-component prep at 56 tubes per cycle — hospital pediatric labs and pediatric reference labs that batch institutional volume of pediatric samples per cycle for serum/plasma separation.
Pediatric infectious-disease cohort prep — pediatric infectious-disease research (pediatric HIV, pediatric TB, pediatric respiratory pathogen studies) where many pediatric samples need cold-chain processing.
Deep cold-chain small-volume clinical-research recruitment — recruiting-phase studies that draw 5 mL or 7 mL collection tubes at high per-day volume on the deep cold-chain chassis.
Veterinary clinical at scale — small-animal blood-component separation in 5/7 mL tube formats at institutional veterinary practice or veterinary-research lab throughput.
Hospital reference labs handling pediatric specimens — pediatric clinical chemistry and hematology prep at institutional throughput on the Z366-K platform.
Cross-format Z366-K core facilities — labs running pediatric tubes alongside other tube and bottle formats benefit from stocking the high-throughput A57 alongside the Z366-250 family.
Ordering & Configuration
4-bucket symmetric loading. All 4 buckets must use matching A57 inserts. Mixed-bucket configurations produce mass asymmetry.
Per-insert symmetric loading. Within each insert, the 14 tubes should be balanced symmetrically. Mixed 1.8/5/7 mL runs require pre-balance by total tube + sample mass.
Tube cap confirmation. All Vacutainer rubber stoppers must be fully seated before spinning at 4,500 rpm.
Z366-250-A57 ships as 2 inserts. 1.8/5/7 mL Vacutainer-style tubes are operator-supplied (commodity clinical phlebotomy supplies). The Z366-250 bucket is sold separately.
Confirm at quote: bucket pairing (Z366-250 in inventory), chassis pairing (Z366 or Z366-K), tube format (1.8/5/7 mL Vacutainer-style), workflow drivers (deep cold-chain, pediatric protocol, institutional throughput), 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 small-volume blood-tube workflow paths (Z366 / Z366-K chassis):
- Z366-250-A57 (this product) — 14 × 1.8–7 mL Vacutainer insert on Z366-250 (56/cycle, bucket-insert flexibility)
- Z366-250-B57 — direct-fit bucket variant on Z366-250-HC rotor (56/cycle, dedicated to small-volume blood tubes)
- Z366-250-A10 — 8 × 6–10 mL Vacutainer (32/cycle, larger tube format)
Pick A57 for bucket-insert flexibility across multiple tube formats; pick B57 when small-volume clinical blood-tube is the dominant workflow.
