The Z326-50-B15R is a 15 mL round-bottom 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 super-speed angle rotor and similar) — sold as a 2-pack. The R suffix in the SKU denotes compatibility with the round 50 mL rotor envelope (vs the standard B15 which serves the conical 50 mL rotor envelope). Pairs with the high-RCF Z326-0650-HS rotor for 15 mL round-bottom workflows that need higher-RCF processing than conical-rotor chassis deliver (13,522 × g vs 8,141 × g).
Key Specifications
| SKU | Z326-50-B15R |
| Type | Tube adapter — 50 mL round position → 15 mL round-bottom |
| Pack quantity | 2 adapters per SKU |
| Tube format accepted | 1 × 15 mL round-bottom (17 mm OD, 100–105 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 Z326-0650-HS spec — 12,000 rpm at 13,522 × g maximum |
| Max. radius (host rotor) | 8.4 cm |
| Temperature at max speed (refrigerated chassis) | 4 °C |
| List price | $201 (2-pack) |
Compatibility & When to Order This SKU
Adapter pairing — 50 mL round rotor positions only. The Z326-50-B15R is engineered for the round 50 mL rotor envelope. For 50 mL conical rotors (Z326-1050 and similar), use the sister adapter Z326-50-B15 instead — different envelope geometry.
Order this SKU when:
- Adding 15 mL round-bottom 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 15 mL round-bottom workflows — when the workflow benefits from the host rotor's higher-RCF range (Z326-0650-HS at 13,522 × g) for 15 mL round-bottom prep (13,522 × g substantially exceeds the 8,141 × g of the conical Z326-1050 rotor).
- Cold-chain mid-RCF 15 mL round-bottom prep — when the workflow needs both refrigeration (4 °C at max speed on Z326-K / Z327-K) and >10,000 × g 15 mL round-bottom processing.
- Replacement adapters if a current set is damaged or worn.
Conical vs Round 50 mL Rotor — Why the Envelope Matters
Hermle 50 mL angle rotors split into two envelope geometries with substantially different RCF ranges:
- Conical 50 mL rotors (e.g., Z326-1050 10 × 50 mL) — Falcon-style conical envelope; 7,500 rpm at 8,141 × g
- Round 50 mL rotors (e.g., Z326-0650-HS 6 × 50 mL round super-speed) — round-bottom envelope; 12,000 rpm at 13,522 × g
The 15 mL adapter for one envelope doesn't fit the other. Pick the B15R when 15 mL round-bottom workflow needs the higher-RCF range that round-rotor chassis deliver; pick the B15 when standard 15 mL round-bottom workflow on a conical-rotor chassis is the target.
Application Profile
High-RCF 15 mL round-bottom prep on a 50 mL round-rotor chassis — when 15 mL round-bottom workflow needs the higher-RCF range (13,522 × g) that the Z326-0650-HS super-speed round rotor delivers.
Cell-pellet recovery in 15 mL round-bottom at high RCF — when the workflow needs tight pellet compaction at the 15 mL scale.
Density-gradient prep in 15 mL round-bottom at higher RCF — Ficoll, Percoll, sucrose-gradient workflows requiring >10,000 × g.
Cold-chain mid-RCF 15 mL prep on Z326-K / Z327-K — refrigerated 15 mL round-bottom workflows on the high-speed round rotor.
Mixed-volume workflow on Z326-0650-HS — when the lab's primary chassis runs Z326-0650-HS (50 mL round super-speed) but the workflow includes occasional 15 mL round-bottom prep.
Cross-format Z326-K / Z327-K core facilities — shared cores running both 50 mL round and 15 mL round-bottom workflows on the same 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 15 mL tube.
Tube cap confirmation. All 15 mL round tubes must be securely capped before spinning at 12,000 rpm — at high RCF, cap integrity is critical.
Z326-50-B15R 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 round angle rotor — Z326-0650-HS or other), chassis pairing (Z326, Z326-K, Z327, Z327-K), envelope confirmation (round 50 mL rotor; conical rotor uses B15 instead), pack count (3 packs for full 6-position configuration on Z326-0650-HS), and lead time.
Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the adapters.
Z326-50 adapter family — 15 mL round-bottom adapters by host envelope:
- Z326-50-B15R (this product) — 15 mL round-bottom for round 50 mL rotors (high RCF)
- Z326-50-B15 — 15 mL round-bottom for conical 50 mL rotors
- Z326-50-B15HS — extended-length 15 mL round-bottom for Z326-1050 (97–123 mm)
- Z326-50-A15R — 15 mL conical for round 50 mL rotors (different tube envelope)
Match the adapter to both the host rotor envelope (conical vs round) AND the workflow's tube envelope (conical vs round-bottom).
