The Z326-50-B15 is a 15 mL round-bottom tube adapter for the 50 mL conical position on Hermle Z326 / Z327 family 50 mL conical angle rotors (Z326-1050 10 × 50 mL conical angle and similar) — sold as a 2-pack. The B-prefix in the SKU denotes a round-bottom tube envelope (vs the A-prefix Z326-50-A15 which serves 15 mL conical tubes in the same 50 mL conical rotor position). The two adapters serve the same host rotor envelope but different tube formats — pick the B15 when the workflow uses 15 mL round-bottom tubes (e.g., 15 mL Vacutainer-style, 15 mL glass round-bottom) on a 50 mL conical workhorse rotor.
Key Specifications
| SKU | Z326-50-B15 |
| Type | Tube adapter — 50 mL conical position → 15 mL round-bottom |
| Pack quantity | 2 adapters per SKU |
| Tube format accepted | 1 × 15 mL round-bottom (17 mm OD) |
| Compatible host rotor envelope | 50 mL conical angle rotor positions on Z326 / Z327 family chassis (e.g., Z326-1050) |
| 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 Z326-1050: 7,500 rpm at 8,141 × g maximum |
| List price | $194 (2-pack) |
Compatibility & When to Order This SKU
Adapter pairing — 50 mL conical rotor positions only. The Z326-50-B15 is engineered for the conical 50 mL rotor envelope (host rotor like Z326-1050). For round 50 mL rotor envelopes (Z326-0650-HS), use the sister adapter Z326-50-B15R instead — different envelope geometry.
Order this SKU when:
- Adding 15 mL round-bottom tube workflow to a 50 mL conical rotor on a Z326 / Z327 chassis — order pack count to match the host rotor's position count (10-position Z326-1050 = 5 packs for full configuration).
- Mixed-format runs — when some positions need 50 mL conical tubes, others need 15 mL conical (Z326-50-A15 sister adapter), and others need 15 mL round-bottom (this SKU) within the same cycle (with adapter symmetry preserved across paired positions).
- Replacement adapters if a current set is damaged or worn.
A-Prefix vs B-Prefix Adapter Naming
The Z326-50 adapter family uses a naming convention that signals tube envelope geometry:
| Adapter | Tube format | Envelope geometry |
| Z326-50-A15 | 1 × 15 mL conical | Conical envelope (Falcon-style tapered base) |
| Z326-50-B15 (this SKU) | 1 × 15 mL round-bottom | Round-bottom envelope |
| Z326-50-A15R | 1 × 15 mL conical for round rotors | Conical tube in round rotor envelope |
| Z326-50-B15R | 1 × 15 mL round-bottom for round rotors | Round-bottom tube in round rotor envelope |
| Z326-50-B15HS | 1 × 15 mL round-bottom (extended length) | Round-bottom envelope, longer length range (97–123 mm) |
The A-prefix vs B-prefix distinction is structurally important — using the wrong envelope adapter risks tube fit problems and balance issues at the rotor's high-RCF range. Confirm tube format envelope before ordering.
Application Profile
15 mL round-bottom Vacutainer-style workflows on conical rotor chassis — when the lab's primary 50 mL conical rotor (Z326-1050) handles occasional 15 mL Vacutainer-style or other round-bottom 15 mL workflows.
15 mL glass round-bottom workflows — when the protocol specifies glass round-bottom 15 mL tubes (organic-solvent compatibility, autoclave reuse) and the chassis is a 50 mL conical configuration.
Mixed-format clinical and clinical-research consolidation — when workflows include both 15 mL conical (Z326-50-A15 adapter) and 15 mL round-bottom (this SKU) tubes on the same Z326-1050 chassis.
Cold-chain 15 mL round-bottom prep on Z326-K / Z327-K — refrigerated 15 mL round-bottom workflows on the conical host rotor.
Educational and clinical-tech teaching workflows — teaching curricula using 15 mL round-bottom tubes on a 50 mL conical chassis.
Ordering & Configuration
Symmetric adapter loading. Pair adapter positions across the rotor by tube mass; all positions in a balanced pair must use matching adapter + tube combinations.
Adapter seat verification. Confirm each adapter is fully seated in its 50 mL conical position before loading the 15 mL round tube.
Tube cap confirmation. All 15 mL round tubes must be securely capped before spinning at the host rotor's max RPM.
Z326-50-B15 ships as 2 adapters. 15 mL round-bottom tubes are operator-supplied (commodity Vacutainer-style or round-bottom glass formats).
Confirm at quote: host rotor (which 50 mL conical angle rotor will use the adapter — Z326-1050 or other), chassis pairing (Z326, Z326-K, Z327, Z327-K), tube format envelope (15 mL round-bottom; 15 mL conical uses A15 instead), 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 position adapters by tube envelope:
- Z326-50-B15 (this product) — 15 mL round-bottom for conical 50 mL rotors
- Z326-50-B15HS — 15 mL round-bottom extended-length (97–123 mm) for Z326-1050
- Z326-50-B15R — 15 mL round-bottom for round 50 mL rotors (Z326-0650-HS)
- Z326-50-A15 — 15 mL conical for conical 50 mL rotors
- Z326-50-A15R — 15 mL conical for round 50 mL rotors
- Z326-50-A30 — 30 mL round for round 50 mL rotors
Match the adapter to both the host rotor's envelope (conical vs round) AND the workflow's tube envelope (conical vs round-bottom vs extended-length round).
