7 × 50 mL Round-Bottom Insert for Z306-100 (2/pk)

The Z306-100-A50R is the 7-position 50 mL round-bottom tube insert for the Hermle Z306-100 swing-out bucket on the Z307 chassis 4-place rotor, sold as a 2-pack. Each insert holds 7 × 50 mL round-bottom tubes; the 4-bucket rotor configuration takes 2 packs (4 inserts) for full symmetric loading, delivering 28 × 50 mL round-bottom tubes per cycle (1.4 L total volume per cycle) when fully equipped. Sister insert to the A50 (50 mL conical format), both serve the same 50 mL workflow envelope but for different tube geometries.

Key Specifications

Compatibility & When to Order This SKU

Insert pairing: Z306-100 swing-out bucket only. Order this SKU when:

1. Adding 50 mL round-bottom tube workflow to an existing Z307 + Z306-100 install. Order 2 units for full 4-bucket symmetric loading (28 tubes/cycle, 1.4 L total).
2. Glass round-bottom tube workflows when the protocol requires glass for chemical compatibility (organic solvents, autoclave reuse) and the round-bottom geometry is specified.
3. Replacement inserts if a current set is damaged or worn.

Application Profile

Round-bottom vs conical (vs the A50 sister). The A50R holds 50 mL round-bottom tubes (typical clinical / serological round-bottom glass or polypropylene formats, 90–108 mm length). The A50 sister insert holds 50 mL conical tubes (Falcon, Corning, 75–100 mm length). The two formats have different shoulder geometries; using the wrong insert risks tube fit problems and balance issues.

Glass tube workflow compatibility. 50 mL round-bottom glass tubes support workflows requiring glass for organic-solvent compatibility, repeated autoclave reuse, or precise volume measurement (graduated glass tubes).

4-bucket symmetric loading. All 4 buckets must use matching A50R inserts for symmetric balance.

Design Architecture

Glass-compatible 50 mL workflows: organic-extraction, chemical-prep, and precipitation workflows in 50 mL working volume that require glass tube compatibility.

Clinical and clinical-research serological workflows. 50 mL round-bottom tubes used in some serological prep protocols.

Cell-culture pellet recovery in 50 mL round-bottom: when the protocol uses round-bottom glass over conical for specific resuspension or solvent-compatibility requirements.

Bench-scale protein prep in glass round-bottom. TCA, ammonium-sulfate, organic-precipitation steps where glass tube reuse and chemical compatibility justify the round-bottom format choice over disposable conical polypropylene.

Educational and graduate-level chemistry / biochemistry teaching. Workflows specifying round-bottom glass for protocol-fidelity teaching exercises.

Cross-format Z307 chassis consolidation: labs that run both round-bottom and conical 50 mL workflows benefit from stocking both A50 and A50R inserts on the same bucket and chassis.

Ordering & Configuration

4-bucket symmetric loading. All 4 buckets must use matching A50R inserts. Mixed-bucket configurations produce mass asymmetry.

Per-insert symmetric loading. Within each insert, the 7 round-bottom tubes should be balanced symmetrically. Pair tubes by mass.

Tube cap confirmation. All round-bottom tubes must be capped before spinning at 4,500 rpm.

Z306-100-A50R ships as 2 inserts. 50 mL round-bottom tubes (glass or polypropylene) are operator-supplied.

Confirm at quote: bucket pairing (Z306-100 in inventory), chassis pairing (Z307), tube format (50 mL round-bottom; A50 for conical), 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.

Z306-100 bucket 50 mL insert pair:

- Z306-100-A50R (this product): 7 × 50 mL round-bottom

- Z306-100-A50: 7 × 50 mL conical

Match the insert to the workflow's tube geometry. Both deliver 28-tube parallel throughput on the full 4-bucket configuration; only the tube geometry differs.