4 × 750 mL Swing-Out Rotor without Buckets (Z446 Accessory)

The Z446-750-AC is the swing-out rotor body alone — without the round buckets that ship with the standard Z446-750 SKU. The "AC" suffix in Hermle's nomenclature indicates "without buckets" (matching the Z327-200-AC and Z496-1000-AC pattern across the Z-series rotor catalog). This is the right SKU when the lab is building a custom bucket configuration, replacing a worn rotor body while retaining serviceable buckets, or commissioning hermetically sealed bucket configurations as separate line items. For the standard configuration (rotor body + 4 round buckets), order Z446-750 instead at $3,820 — that's an $782 step-up that includes the buckets which are otherwise the limiting accessory for any 750 mL workflow on the Z446 chassis.

Key Specifications

Compatibility & When to Order This SKU

This is the rotor body only. Order Z446-750-AC when at least one of the following applies:

1. You already have compatible Z446-750 round buckets from a prior install or transferred from a retired Z446 chassis, and you only need the rotor body.
2. You're commissioning a custom bucket configuration — Z446 family supports round buckets (Z446-750-BUK), rectangular buckets for microplates (Z446-MP-BUK), or hermetically sealed bucket lids (Z446-750-LID). If your workflow specifies a non-standard bucket combination, ordering the rotor body separately gives flexibility.
3. Replacement rotor only — if a current Z446-750 rotor is approaching service life or has been damaged, but the buckets are inspection-pass, the rotor-only replacement is the cost-effective path.
4. Sealed-bucket biosafety workflow — for blood-borne-pathogen, BSL-2/3 clinical, or aerosol-generating sample workflows that require hermetically sealed buckets, the rotor body plus sealed buckets configuration is the spec rather than the standard Z446-750 + open round buckets.

For the standard configuration, order Z446-750 instead — that SKU bundles the rotor body + 4 round buckets at $3,820 (single-line procurement path).

Compatibility — Chassis Family

The Z446-750-AC fits the Z446 family only:

• Z446 (120 V, non-refrigerated)
• 230 V non-refrigerated variant (by special order)
• Z446-K (120 V, refrigerated, requires 15 A circuit)
• 230 V refrigerated variant (by special order, requires 20 A circuit)

Not compatible with Z366, Z327, Z496-K, or smaller universal centrifuge chassis (different drive-spindle dimensions and rotor speed-class limits).

Workflow Notes

RFID-tagged. The Z446-750-AC carries an RFID tag that the chassis reads at insertion — the drive applies the rotor's rated 4,000–4,500 rpm cap automatically and tunes the per-rotor imbalance threshold to the assembled rotor + bucket configuration.

Bucket compatibility verification. Before mounting buckets onto the Z446-750-AC rotor body, confirm that the buckets are rated for the same RCF class. The Z446 catalog includes round buckets (Z446-750-BUK, the standard configuration) and microplate buckets (Z446-MP-BUK, rectangular profile for direct-microplate loading). Mixing buckets across the rotor (round on some positions, rectangular on others) is not supported — all 4 positions must use the same bucket profile.

Pre-cooling on Z446-K. The chassis's per-rotor pre-cooling program is rotor-specific. With the rotor body only (no buckets installed in inventory), pre-cooling estimates may differ from the assembled rotor + bucket mass; once the bucket configuration is installed and characterized, the chassis pre-cooling timing matches the assembled mass.

Ordering & Configuration

Z446-750-AC ships as the swing-out rotor body only — no buckets, no bucket lids, no adapters. Operator's manual / installation guide for the rotor body is included.

Required for operation: Compatible Z446 family buckets (sold separately, or already in the lab's inventory). The rotor body without buckets cannot be operated.

Compatible bucket SKUs (sold separately):

• Z446-750-BUK — Round bucket (the standard configuration; sold individually for replacement or supplementation)
• Z446-MP-BUK — Rectangular bucket for direct microplate loading
• Z446-750-LID — Bucket lid for hermetically sealed configuration (biosafety workflows)

Use the quote request to confirm: chassis pairing (Z446 / Z446-K), bucket source (existing inventory, new round-bucket order, or sealed-bucket configuration), and lead time. If you're sourcing buckets separately, the Hermle / Benchmark distributor can recommend the correct bucket SKUs and lid configurations per workflow.

Warranty: 5-Year Hermle warranty (3 years full + 2 years drivetrain) on the rotor body. Buckets sourced separately carry their own bucket-SKU warranty terms.

Z446-750 vs Z446-750-AC selection: if you're commissioning a new Z446 install or don't already have compatible buckets, order Z446-750 ($3,820) — bundled rotor + 4 round buckets is the single-line procurement path. Order Z446-750-AC (this product) at $3,038 only when you already own compatible buckets, are configuring a custom bucket set, or need a rotor-only replacement.