The Z326-50-B15HS is a 15 mL round-bottom tube adapter for the Z326-1050 (10 × 50 mL conical angle rotor) — sized for extended-length 15 mL round-bottom tubes (97–123 mm length range) that exceed the standard B15 adapter's envelope. Sold as a 2-pack. The HS suffix denotes the extended-length variant; the standard Z326-50-B15 covers shorter 15 mL round-bottom tubes (100–105 mm), and the B15HS extends the supported tube length up to 123 mm — useful for specialty round-bottom tube formats and for Vacutainer-style long-format clinical-blood collection tubes that don't fit the shorter standard adapter.
Key Specifications
| SKU | Z326-50-B15HS |
| Type | Tube adapter — 50 mL conical position → 15 mL round-bottom (extended-length) |
| Pack quantity | 2 adapters per SKU |
| Tube format accepted | 1 × 15 mL round-bottom (17 mm OD, 97–123 mm length range) |
| Compatible host rotor | Z326-1050 (10 × 50 mL conical angle rotor) |
| Compatible chassis | Z326, Z326-K (refrigerated), Z327, Z327-K (refrigerated), and -E voltage variants |
| Max. operating speed (with adapter + tube) | Per Z326-1050 spec — 7,500 rpm at 8,141 × g maximum |
| Max. radius (host rotor) | 13 cm |
| Temperature at max speed (refrigerated chassis) | 0 °C |
| List price | $201 (2-pack) |
Compatibility & When to Order This SKU
Adapter pairing — Z326-1050 (10 × 50 mL conical angle rotor) only. The Z326-50-B15HS is engineered for the Z326-1050 rotor's 50 mL conical position envelope, with extended length tolerance for tubes up to 123 mm. Order this SKU when:
- Adding extended-length 15 mL round-bottom tube workflow to a Z326-1050 install — order pack count to match the host rotor's 10-position count (5 packs = 10 adapters for full configuration).
- 15 mL Vacutainer-style long-format tubes that exceed the standard B15 adapter's 100–105 mm length envelope.
- Specialty 15 mL round-bottom glass tubes in the 97–123 mm length range used for specific protocol formats (some serological, some long-format glass-tube chemistry workflows).
- Replacement adapters if a current set is damaged or worn.
Why a Length-Specific Variant Matters
Standard 15 mL round-bottom tube formats split into two length classes that the Z326-50 adapter family addresses with separate SKUs:
| Adapter | Length envelope | Use case |
| Z326-50-B15 | 100–105 mm | Standard 15 mL round-bottom tubes |
| Z326-50-B15HS (this SKU) | 97–123 mm | Extended-length tubes (long Vacutainer, specialty glass) |
Using the wrong-length adapter risks tube fit problems — too-short tubes rock within an oversized envelope, and too-long tubes don't seat fully in an undersized envelope. Confirm tube length before ordering.
Application Profile
Cold-chain extended-length 15 mL clinical workflows on Z326-1050 — clinical workflows using long-format Vacutainer-style 15 mL tubes for blood-component separation at refrigerated temperature on the high-throughput 10-position rotor.
Specialty 15 mL round-bottom glass workflows — protocols specifying 130 mm round-bottom tubes (some immunology, some long-format glass-tube chemistry workflows) where the standard 100–105 mm B15 doesn't seat the tube correctly.
Mixed-length 15 mL workflow consolidation — when the lab handles both standard 100–105 mm and extended 97–123 mm 15 mL round-bottom formats, both adapter SKUs (B15 and B15HS) cover the full length range.
High-throughput cold-chain serological prep — serological 15 mL round-bottom workflows that benefit from 10-position parallel throughput at refrigerated temperature.
Veterinary clinical workflows — some veterinary phlebotomy uses long-format 15 mL collection tubes; the B15HS delivers cold-chain veterinary blood-component separation on the Z326-1050 rotor.
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 conical position before loading the extended-length 15 mL tube.
Tube cap confirmation. All 15 mL tubes must be securely capped before spinning at 7,500 rpm.
Z326-50-B15HS ships as 2 adapters. 15 mL round-bottom tubes (extended-length, 97–123 mm) are operator-supplied.
Confirm at quote: host rotor (Z326-1050 in inventory), chassis pairing (Z326, Z326-K, Z327, Z327-K), tube length confirmation (97–123 mm range; shorter tubes use B15 instead), pack count (5 packs for full 10-position configuration), 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 length and host:
- Z326-50-B15HS (this product) — extended-length 97–123 mm for Z326-1050
- Z326-50-B15 — standard length 100–105 mm for conical 50 mL rotors
- Z326-50-B15R — standard length 100–105 mm for round 50 mL rotors (Z326-0650-HS)
Match the adapter to both the host rotor (conical vs round 50 mL envelope) AND the tube length (standard vs extended).
