The Z326-50-A30 is a 30 mL round tube adapter for the 50 mL round position on Hermle Z326 / Z327 family 50 mL round angle rotors (Z326-0650-HS 6 × 50 mL round angle rotor and similar) — sold as a 2-pack. The adapter converts a 50 mL round-bottom workflow position into a 30 mL round position without rotor swap. The 30 mL round format sits in the intermediate volume range — between 15 mL and 50 mL — useful for workflows specifying 30 mL working volume (some bioprocess intermediates, some clinical-research aliquot prep, some chemical-prep workflows).
Key Specifications
| SKU | Z326-50-A30 |
| Type | Tube adapter — 50 mL round position → 30 mL round tube |
| Pack quantity | 2 adapters per SKU |
| Tube format accepted | 1 × 30 mL round tube (25 mm OD, 92–95 mm length) |
| Compatible host rotor envelope | 50 mL round angle rotor positions on Z326 / Z327 family chassis (e.g., Z326-0650-HS) |
| Compatible chassis | Z326, Z326-K (refrigerated), Z327, Z327-K (refrigerated), and -E voltage variants |
| Max. operating speed (with adapter + tube) | Per host rotor spec — for Z326-0650-HS: 12,000 rpm at 13,522 × g maximum |
| List price | $201 (2-pack) |
Compatibility & When to Order This SKU
Adapter pairing — 50 mL round rotor positions only. The Z326-50-A30 is engineered for the round 50 mL rotor envelope. Order this SKU when:
- Adding 30 mL round tube workflow to a 50 mL round rotor on a Z326 / Z327 chassis — order pack count to match the host rotor's position count (6-position Z326-0650-HS = 3 packs for full configuration).
- High-RCF 30 mL workflows — when the workflow benefits from the host rotor's higher-RCF range (Z326-0650-HS at 13,522 × g) for 30 mL prep.
- Mixed 50 / 30 mL workflow consolidation — when the lab's primary chassis is round-rotor configured but occasional 30 mL workflows arise.
- Replacement adapters if a current set is damaged or worn.
Why 30 mL Matters as an Intermediate Volume
The 30 mL round tube format sits between common formats:
- 15 mL conical / round — clinical-research and small-volume workflows
- 30 mL round (this adapter) — bioprocess intermediates, mid-volume aliquot prep, some chemical extractions
- 50 mL conical / round — institutional clinical-research and bioprocess workflows
Some workflows specifically require 30 mL working volume — vaccine intermediate prep, certain bioprocess cell-culture aliquots, certain organic-extraction protocols — where 15 mL is too small and 50 mL is more sample than the protocol specifies. The Z326-50-A30 adapter delivers this intermediate volume on a 50 mL round-rotor chassis without requiring a dedicated 30 mL rotor.
Application Profile
High-RCF 30 mL bioprocess intermediate prep — vaccine-development and bioprocess workflows that batch 30 mL working volumes for intermediate concentration steps requiring higher RCF.
Cell-pellet recovery in 30 mL — when the workflow batches 30 mL cell-culture suspension at higher-RCF for tighter pellet compaction.
Mid-volume protein-prep workflows — TCA, ammonium-sulfate, organic precipitation in 30 mL working volume on a high-RCF round-rotor chassis.
Clinical-research mid-volume aliquot prep — when patient sample workflows generate 30 mL pooled aliquots requiring high-RCF processing.
Mixed-format Z326-K / Z327-K core facilities — shared cores running both 50 mL round and 30 mL round workflows on the same chassis can stock the adapter for workflow-specific configuration.
Environmental and analytical sample prep — water, soil-extract, sediment-supernatant prep at 30 mL bottle scale on the high-RCF round-rotor chassis.
Ordering & Configuration
Symmetric adapter loading. Pair adapter positions across the rotor by tube mass.
Adapter seat verification. Confirm each adapter is fully seated in its 50 mL round position before loading the 30 mL tube.
Tube cap confirmation. All 30 mL round tubes must be securely capped before spinning at the host rotor's max RPM.
Z326-50-A30 ships as 2 adapters. 30 mL round tubes are operator-supplied.
Confirm at quote: host rotor (which 50 mL round angle rotor will use the adapter — Z326-0650-HS or other), chassis pairing (Z326, Z326-K, Z327, Z327-K), envelope confirmation (round 50 mL rotor), pack count needed for the host rotor's position count, and lead time.
Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the adapters.
Z326-50 adapter family — 50 mL round position adapters:
- Z326-50-A30 (this product) — 30 mL round (intermediate volume)
- Z326-50-A15R — 15 mL conical for round 50 mL rotors
- Z326-50-B15R — 15 mL round-bottom for round 50 mL rotors
Match the adapter to the workflow's smaller tube format. The A30 is the right pick when 30 mL is the protocol-specified working volume and the host chassis is a round-rotor configuration.
