HZ-330: The Largest Centrifugal Barrel Finisher in the HZ-Series

HZ-60 centrifugal barrel finishing machine with lid open.

HZ-330 High-Energy Centrifugal Barrel Finishing Machine

The Biggest High-Energy Centrifugal Tumbler Mass Finishing Makes: 12.8 Cubic Feet, 30 HP, Parts Up to 40 Inches

The HZ-330 is the flagship of the HZ-Series—the largest, most powerful centrifugal barrel finisher in the lineup. Every specification leads the series: 41.4″ barrels that accept parts up to 40.75″ long and 11″ in diameter. 11.9″ barrel bore—the widest in the lineup. 12.8 cubic feet of total capacity. 30 HP main motor. 120 individual divider chambers. And an automatic door opener that comes standard, because at this machine’s scale, manual door operation isn’t practical.

When manufacturers contact Mass Finishing about the HZ-330, the conversation usually starts with a specific problem: the parts are too large or too numerous for any other centrifugal barrel finisher to handle. Drive shafts over 3 feet long, oversized cast housings, large structural weldments, heavy forged components, and high-volume automotive production runs that need 12+ cubic feet of batch capacity per cycle—these are HZ-330 applications.

The HZ-330 delivers 60% more capacity than the HZ-220, with double the motor power (30 HP vs. 15 HP) to drive the heaviest barrel loads at consistent speed. Variable frequency control reaches 115 RPM—lower than smaller models, but the combination of the widest barrel radius in the series and the most powerful motor generates substantial centrifugal force at every point in the barrel.

Machine Type: High Capacity
Max Part Size: 40.75″ L x 11″ D
Barrel Dimensions: 41.4″ L x 11.9″ D
Popular Industries: Automotive & Transportation

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Operating at the Scale Where No Other Centrifugal Barrel Finisher Reaches

The HZ-330 exists for a simple reason: some manufacturing operations produce parts that are too large, too heavy, or too numerous for any other centrifugal barrel finisher to process. Before the HZ-330, the alternative was multiple smaller machines running in parallel, vibratory tubs that lack the force of centrifugal processing, or hand finishing at enormous labor cost. The HZ-330 consolidates that finishing capacity into a single machine.

At 30 HP—double the HZ-220’s motor power—the HZ-330 drives four barrels loaded with dense ceramic media and heavy steel or iron components without speed degradation. The Allen Bradley PowerFlex 525 provides variable frequency control up to 115 RPM. While lower than the smaller models’ top speeds, the HZ-330’s barrel radius is the largest in the series, meaning each revolution generates the longest arc path of any HZ machine—and centrifugal force is a function of both speed and radius.

The automatic door opener is standard on the HZ-330. At 101″ x 65″ x 123″ overall dimensions and a shipping weight of 6,800 lbs (8,800 with drain pan), the main access door is too large and heavy for routine manual operation. The auto door is a practical design requirement, not a convenience feature.

HZ-330: Every Specification Leads the Series

41.4″ barrels—the longest AND widest

At 41.4″ long and 11.9″ in diameter, the HZ-330’s barrels accept parts up to 40.75″ long and 11″ across. Drive shafts, crossmembers, large structural weldments, oversized housings, and full-length automotive subframe components fit without compromise. No other HZ-Series machine comes close to this part envelope.

12.8 cubic feet—the highest batch capacity

60% more capacity than the HZ-220 and over 9X the compact HZ-40. For high-volume automotive production lines processing hundreds of heavy parts per shift, the HZ-330’s capacity reduces total cycle count per day to the minimum possible—maximizing throughput per machine hour.

120 divider chambers—the most of any HZ model

With 29 divider slots per barrel (30 chambers each, 120 total), the HZ-330 provides the highest part-isolation count in the series. Automotive OEMs running mixed assemblies of different part numbers, sizes, and materials through the same cycle can isolate every group without compromise.

30 HP—the most powerful motor in the lineup

Double the HZ-220’s motor power. When barrels are loaded with heavy ceramic media and dense metal castings—total barrel loads that can exceed hundreds of pounds—the 30 HP motor maintains consistent rotation speed without the power fade that smaller motors experience. Finishing quality stays uniform from the first cycle of the shift to the last.

Automatic door opener (standard)

The HZ-330’s main access door is too large for routine manual operation. The auto door opens and closes at the push of a button, maintaining production cadence during changeovers without the ergonomic strain of moving a door this size by hand, shift after shift.

Full production-line integration

PLC touchscreen with recipe storage, internal vibratory separator, drain pan, infrared safety curtains, centrifuge wastewater system, and media return system. The HZ-330 integrates into high-volume automotive production cells or operates as the anchor finishing station in a heavy industrial fabrication shop.

HZ-330 Barrels

The HZ-330 features four hexagonal barrels measuring 41.4″ L x 11.9″ D—the largest barrels in the entire HZ-Series by both length and diameter. Removable lids are secured with cam locks, and the standard air-driven cover lift handles lid removal via toggle switch. The HZ-330 also includes a standard automatic door opener that opens and closes the main access door with a button press—a necessary feature given the machine’s size and the production cadence it’s designed to sustain.

120 Chambers: The Highest Part Isolation in the HZ-Series

Each HZ-330 barrel has 29 divider slots, creating up to 30 isolated chambers per barrel—120 separate compartments across all four barrels. This is 36 more chambers than the HZ-220 (84) and the highest isolation count of any machine in the lineup.

At this chamber count, the HZ-330 enables production workflows that no other single machine can support:

High-mix automotive production: Dozens of different part numbers from multiple program families, each isolated in their own chamber range, processed in a single cycle.
Large-format fabricated parts: Oversized weldments, structural brackets, and forged components that need individual isolation because of their size and weight—30 chambers per barrel provides enough space for even the largest individual parts.
High-volume small-part processing: When the goal is pure throughput, 120 compartments can hold hundreds of smaller parts, each group separated by customer order, material type, or finishing specification.

Dividers are NYLOIL® cast nylon with built-in oil lubrication. A second barrel set enables continuous operation.

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HZ-330 Recommended Accessories

Part & Media Separator

Simplify the media & part separation process
Dump fully loaded barrels
The machine vibrations separate the media & parts out of the machine and into bins

Drain Pan

Collects water and drainage during the loading/unloading process
Grip strut floor surface to prevent operator slips and falls

Barrel Dividers

Create separate chambers inside each of your barrels
Reduce part-on-part impingment
Available for all HZ-Series models (except HZ-12)

PLC Touchscreen

Store processes as recipes for easy process selection
Replaces the analog cycle start buttons
Allows for better monitoring of machine use and time

Additional HZ-330 Specs & Resources

HZ-330 Machine Specs
Main Motor	30 HP Totally Enclosed 230v to 460v (Please specify upon order) Three Phase, 60 hertz
Barrel Rotation Motor	2 HP 230/460 volt 3 phase, 60 hertz.
Machine Voltage	230/460 volt (Please specify upon order)
Total Capacity	12.8 cubic feet
Approximate Shipping Weight	6,800 lbs. (Machine only) 8,800 lbs. (With Drain pan option)
Drive	Variable Frequency Allen-Bradley, PowerFlex 525
Overall Dimensions	101” x 65” x 123”(machine)
Machine Construction	Heavy duty steel All welded construction Reinforced, gusseted, and welded to maximum strength
Paint	Heavy-duty powder coat Scratch resistant
Barrel Construction	41.4”L x 11” Dia. Four hexagonal barrels with removable lids Cam locks for secure operation
Barrel Liners	Hot poured polyurethane ¼” thick Field replaceable 29 Divider slots, 30 individual chambers possible
Barrel Cover Lift-(Optional)	Air driven system for removing covers Controlled via toggle switch on control panel
Control Panel	NEMA 12 enclosed panel UL Certification Available ABB push buttons and switches PLC Option Available 0-100 Hour cycle timer mounted on panel Power jog of turret
Brake	Automatically stops the turret when a stop is activated or cycle is completed Activated if door is opened
Safety Interlock	Prevents door from being opened during operation Machine must be powered on in an idle mode to disengage lock Can only be opened once cycle is finished

Vibratory Media Separator	Dump fully loaded barrels inside machine Media and parts are separated through screens and vibration Media and parts travel out of machine to bins
Spray Header for Separator	Water spray bar that runs automatically when separator is running to clean media and parts
Drain Pan	100”L X 79-1/2”W X 8-1/2”H Collects any water drainage during loading/unloading Grip strut floor surface to prevent operator slips and falls
Processing Table and Sludge Tank	Constructed of 1/2” P.V.C. and Anodized aluminum frame Includes three compartment sludge tank mounted on casters for easier mobility Sludge tank can be sold separately
Barrel Dividers	Made from NYLOIL® A cast nylon with built-in oil lubrication Provides superior machinability, performance, and durability compared to other plastic
PLC Controller	Horner Electric EXL6 Store recipes and processes Maintenance reminders and machine diagnostics Automated fwd/rev and speed adjustment
Rinse Screen	Fits over barrel and dividers Attaches with quick latches Spray out dirty water and debris without dumping barrels
Infrared Safety Light Curtains	Disables machine if curtain is broken while door is open during loading/unloading Added layer of safety
Light Tower Indicator	Visual indicator of machines status Can be customized to match existing equipment
Media Return System	Operated with foot pedal Lifts media to bench height after media baskets are slid onto platform Reduces lifting requirements on operators
Custom Logo/Paint	Paint matched to customer color scheme requirements Sticker Logo provided by MFI or Client
Centrifuge Module – CF55 SD Series Microseparator^TM	Clean and process effluent from tumbling process Processed wastewater is safe to send to drain or be used in a recycling system Solids are collected through centrifugal action of rotor via a reusable liner
Automatic Door Opener	Makes opening main access door easier Eliminates need for lifting on operator
Media/Compound	Required for running parts MFI Stocks all consumables used in testing process Media ships in 50 or 55 pound quantities
Media Storage Rack	Keep media out of the way when not in use Industrial powder coated steel construction Made to fit 12 MFI gray media bins

HZ-330 vs. HZ-220: When You’ve Outgrown Everything Else

Factor	HZ-220	HZ-330
Barrel Dimensions	27.375″ x 11″	41.4″ x 11.9″
Max Part Size	26.5″ x 10″	40.75″ x 11″
Total Capacity	8 cu ft	12.8 cu ft (+60%)
Total Chambers	84 (21 per barrel)	120 (30 per barrel)
Motor Power	15 HP	30 HP (double)
Max RPM	135	115
Shipping Weight	5,200 lbs	6,800 lbs
Auto Door	Optional	Standard
Best For	Parts up to 26.5″; fabricated metal; automotive assemblies; rubber	Parts up to 40.75″; the largest automotive components; oversized fabricated parts; consolidation of multiple smaller machines

Choose the HZ-330 if your parts exceed 26.5″ in length, your batch volume needs more than 8 cubic feet of capacity, you’re currently running multiple smaller machines to keep up with finishing demand, or your parts are the largest components in your production line and no other centrifugal barrel finisher can accept them.

The HZ-220 is the better fit if your parts fit within 26.5″ x 10″, 8 cubic feet of capacity sustains your production volume, and your budget and floor space favor the smaller machine. The HZ-220 remains the most cost-effective entry into the High Capacity class.

Not sure which model fits? Send us sample parts or share your part dimensions and daily throughput goals—we’ll recommend the right machine and configuration.

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