USA GRANITE TOOLS · STI COLLECTION
STI Floor Grinders & Dust Collection
STI machines include Prep/Master and Lavina grinders, dust collectors, swing machines, accessories and service parts for concrete and terrazzo grinding and polishing. Compare power requirements, working width and compatible attachments, or explore all STI collections.
Categories
- Prep/Master Grinders: Compare electric and propane Prep/Master machines for concrete grinding and polishing.
- Lavina Grinders: Explore Lavina Series 7 grinders offered in the STI catalog.
- Dust Collectors & Vacuums: Compare Prep/Master and IMPACTS dust collectors alongside the wet/dry concrete vacuum.
- Dust Collection Accessories: Complete your dust collection setup with hoses, machine connections, dust skirts, swing-machine pickup accessories and Longopac bags.
- Swing Machines & Accessories: Shop rotary floor equipment, pad drivers, weights, splash guards and solution tanks.
- Prep/Master Service Parts: Find maintenance kits, repair kits, couplers and grout pans for your Prep/Master.
STI Machines: Prep/Master Floor Grinders
STI Prep/Master floor grinders offer electric and propane options for concrete surface preparation and polishing. Review each listing for working width, voltage, phase, weight and included equipment.
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Grinders/Polishers, Equipment & Instruments
STI Electric Concrete Floor Grinder 24″
- 24″ grinding width for efficient surface coverage
- Powerful 20 HP (14.7 kW) WEG electric motor
- Available in 230V or 480V
- Single-phase or three-phase configurations
- Variable speed drive
- Adjustable pocket weight system
- Built-in water tank for wet or dry grinding
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Grinders/Polishers, Equipment & Instruments
STI Electric Concrete Floor Grinder 28″
- 28″ grinding width for increased productivity
- Powerful 7.5 HP (5.5 kW) WEG electric motor
- Available in 230V or 480V
- Single-phase or three-phase configurations
- Variable speed drive
- Adjustable pocket weight system
- Built-in water tank for wet or dry grinding
- Includes 2 tool plates with capacity for 6 tools
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Grinders/Polishers, Equipment & Instruments
STI Electric Concrete Floor Grinder 30″
- 30″ grinding width for maximum production
- Powerful 30 HP (22 kW) WEG electric motor
- Available in 230V or 480V
- Single-phase or three-phase configurations
- Variable speed drive
- Adjustable pocket weight system
- Built-in water tank for wet or dry operation
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Grinders/Polishers, Equipment & Instruments
STI Electric Concrete Floor Grinder Junior 23″
- 23″ grinding width
- 7.5 HP (5.5 kW) WEG electric motor
- 230V single-phase operation
- Variable speed drive
- Includes 2 tool plates supporting 6 tools
- Adjustable pocket weight system
- Approximately 60% of machine weight concentrated on the grinding head
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Grinders/Polishers, Equipment & Instruments
STI Electric Concrete Floor Grinder Senior 27″
- 27″ grinding width
- 20 HP (14 kW) WEG electric motor
- 230V single-phase or three-phase operation
- Variable speed drive
- Includes 4 tool plates supporting 12 tools
- Adjustable pocket weight system
- Approximately 60% of machine weight concentrated on the grinding head
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Grinders/Polishers, Equipment & Instruments
STI Propane Concrete Floor Grinder 24″
- 24″ grinding width for increased productivity
- 18 HP Kawasaki propane engine
- No generator or power cords required
- Variable speed drive
- Adjustable pocket weight system
- Built-in water tank for wet or dry operation
- Includes 4 tool plates supporting 12 tools
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Prep/Master 3030: Concrete Grinding & Polishing
Watch the Prep/Master 3030 floor grinder in action. Review the product listing for electrical requirements, tooling options and compatible dust collection equipment.
Lavina Floor Grinders in the STI Catalog
Explore Lavina Series 7 grinders offered in the STI catalog. Lavina machines are manufactured by Superabrasive; choose the electric or propane configuration that matches your jobsite.
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Grinders/Polishers, Equipment & Instruments
STI Lavina L25S7 Electric Grinder
- 10 HP (7.5 kW) electric motor
- 200–240V, single- or three-phase operation (50–60 Hz)
- 26.5″ working width
- Planetary grinding system
- Sealed, dust-proof grinding head
- Redesigned chain-driven planetary drive without chain tensioner
- Stronger timing belt for longer service life
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Grinders/Polishers, Equipment & Instruments
STI Lavina L20GS7 Propane Grinder
- 18 HP (13 kW) Kawasaki FS481V 603 cc propane engine
- 20″ working width
- Planetary grinding system
- Lavina S7 Series design
- Completely redesigned chain-driven planetary drive
- Stronger timing belt
- Upgraded shafts, seals, and bearings
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Grinders/Polishers, Equipment & Instruments
STI Lavina L30GS7 Propane Grinder
- 24 HP (17.9 kW) KOHLER® PCV740 747 cc propane engine
- Optional 19 HP Kawasaki FX600V propane engine
- 30.8″ working width
- Planetary grinding system
- Lavina S7 Series design
- Sealed, dust-proof grinding head
- Redesigned chain-driven planetary drive
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STI Dust Collectors & Concrete Vacuums
Compare Prep/Master and IMPACTS dust collectors alongside the wet/dry concrete vacuum. Confirm the power, airflow, filtration and hose connection required by your specific grinder or shot blaster.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Prep/Master Dust Collector 3003AR
- Industrial dust collector for concrete grinding, shot blasting, and surface preparation.
- Three 1,000W turbines deliver powerful suction and reliable performance.
- Fully automatic self-cleaning filter cartridges.
- Longopac disposal system for safe collection of toxic dust and waste.
- OSHA-compliant HEPA filtration.
- 300 CFM (510 m³/h) airflow.
- Automatic filter cleaning during operation.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Prep/Master Dust Collector 3003GP
- Industrial-sized dust collector for fine and toxic silica dust.
- Completely redesigned model with improved portability and energy efficiency.
- Updated Longopac disposal system for safe collection of toxic waste.
- OSHA-compliant HEPA filter.
- Durable distribution box with two 230V outlets: 32A and 62A.
- Runs both the vacuum and a grinder or shot blaster from one power supply.
- 230V/60Hz, 3-phase power.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Impacts 3324 Dust Collector – 480V
- Industrial dust collector for concrete grinding, shot blasting, and surface preparation.
- Compact, high-performance Dustcom 3324 design.
- Designed for medium- to large-surface preparation machines.
- 28-gallon (105-liter) dust collection capacity.
- Ergonomically designed large dust bin.
- All-in-one lifting lock for easy dust bin handling.
- Removable and replaceable dust hose connection.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Impacts 4025 Dust Collector
- Industrial dust collector for medium- to large-surface preparation equipment.
- Designed for shot blasting and abrasive recovery applications.
- 52-gallon (200-liter) dust collection capacity.
- High airflow of 765 CFM (1,300 m³/h).
- Operates on 480V/60Hz, 16A power.
- Innovative all-in-one lifting lock for easy dust bin handling.
- Large, user-friendly dust bin.
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Vacuums, Equipment & Instruments
STI Wet/Dry 20 Gallon Concrete Vacuum
- Heavy-duty wet/dry vacuum for concrete and surface preparation cleanup.
- Designed for recovering liquid slurry, water, fine dust, and solid debris.
- 20-gallon roto-molded tank for long-lasting durability.
- Ready for wet and dry applications out of the box.
- Adjustable front-mounted squeegee included.
- Dry application kit with washable synthetic dust bag, dust hose, and attachments.
- Acid- and mildew-resistant washable cloth dust bag.
Brands Carousel
STI Dust Collection Accessories
For STI machines, complete your dust collection setup with the specified hoses, machine connections, dust skirts, pickup accessories and Longopac bags.
Match each accessory to the exact machine and collection system.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Dust Pick-Up System for Swing Machines
Specialty Vacuums & Dust Collectors, Equipment & InstrumentsSTI Dust Pick-Up System for Swing Machines
- Genuine dust collection system for Hawk® rotary swing machines.
- Captures concrete dust directly at the source.
- Connects to compatible dust collectors or industrial vacuums.
- Reduces airborne dust during grinding and surface preparation.
- Helps improve silica dust control and job-site safety.
- Minimizes cleanup time after grinding operations.
- Designed and manufactured by Hawk Enterprises.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Hose with cuffs
- Available in 2″ x 25′ and 3″ x 25′ sizes
- Factory-installed polyweld cuffs for quick, ready-to-use connections
- Double-profile I-Helix construction for excellent flexibility and easy movement
- Crush-resistant design prevents hose collapse under foot traffic or tight bends
- Superior abrasion resistance for long service life
- Smooth interior improves airflow and suction efficiency
- Supports full vacuum operation
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI PrepMaster Dust Skirts
- Replacement dust skirts designed for STI PrepMaster machines.
- Upper tan dust band seals the floating stainless steel shroud to the gearbox.
- Lower black dust shroud seals the floating shroud to the floor.
- Helps improve dust containment during grinding and polishing operations.
- Supports cleaner job sites and more efficient surface preparation.
- Compatible with multiple PrepMaster grinder models.
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Specialty Vacuums & Dust Collectors, Equipment & Instruments
STI Quick Fit Machine Connection for 3003AR
Specialty Vacuums & Dust Collectors, Equipment & InstrumentsSTI Quick Fit Machine Connection for 3003AR
- Quick Fit (QF®) machine connection for the IMPACTS® Prep/Master 3003AR Dust Collector
- Designed for fast connection of QF® ductwork to dust and fume extraction equipment
- Ideal for machines requiring dust or fume removal
- Rolled edge to plain edge configuration for easy installation
- Supports efficient airflow and dust collection performance
- Durable construction for reliable operation
- Available in 2 in, 3 in, and 3 in with Modified Sleeve versions
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Tools & Supplies, Glove Bags/ Disposable Bags
STI Longopac Dust Collection Bags
- Continuous-liner bagging system for dust collectors, vacuums, and cyclones.
- Dust-free bag changes by sealing, cutting, and continuing with the next liner section.
- Helps reduce airborne silica dust and improve job-site safety.
- Extremely strong construction designed to handle heavy concrete dust.
- Long continuous liners reduce bag changes and equipment downtime.
- Available in anti-static versions for ATEX and static-sensitive applications.
- Manufactured from multi-layer polyethylene.
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STI Swing Machines & Accessories
Shop STI machines and accessories for rotary floor work, including pad drivers, weights, splash guards and solution tanks.
Check machine and attachment compatibility before building a complete setup.
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Cleaning Equipment, Equipment & Instruments
STI Swing Rotary Floor Machine
- Available in 17-inch and 20-inch working widths.
- Designed for grinding, polishing, and restoring concrete, terrazzo, and stone floors.
- Compatible with diamond and resin polishing pads.
- 17-inch model: greater maneuverability for tight spaces.
- 20-inch model: more extensive coverage per pass for bigger floors.
- Planetary steel helical-cut gear drive for exceptional reliability.
- 1.5 HP, 120V electric motor.
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Equipment & Instruments, Cleaning Equipment
STI Hawk Pad Driver for Swing Machines
- Genuine Hawk pad driver with integrated clutch plate.
- Designed for Hawk rotary swing machines.
- Securely holds floor pads and polishing pads.
- Clutch plate provides a firm connection between the driver and the machine.
- Keeps pads properly seated for smooth, accurate rotation.
- Helps maintain consistent grinding and polishing results.
- Prevents pad movement or improper mounting during operation.
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Cleaning Equipment, Equipment & Instruments
STI Hawk 4 Gallon Solution Tank
- Genuine solution tank for Hawk® rotary swing machines.
- Dispenses water or cleaning solution directly onto the floor.
- Designed for wet grinding, polishing, and scrubbing applications.
- Large 4-gallon capacity for extended operation between refills.
- Provides controlled liquid flow while the machine is in use.
- Helps reduce dust during wet grinding.
- Cools polishing pads and improves cutting performance.
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Cleaning Equipment, Equipment & Instruments
STI Hawk Hexagonal Weight for Swing Machines
- Genuine Hawk® weight accessory for rotary swing machines.
- Adds 10 lbs of additional down pressure to the machine.
- Allows precise pressure adjustments in 10 lb increments.
- Improves grinding, stripping, and scrubbing performance.
- Helps optimize cutting pressure for different floor conditions.
- Hexagonal design for secure mounting and reliable use.
- Manufactured by Hawk Enterprises.
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Cleaning Equipment, Equipment & Instruments
STI Hawk Horseshoe Weight
- Adds 25 lbs of additional weight for increased down pressure and productivity
- Compatible with Hawk Brute, TE, and TECP floor machine models
- Improves performance during sanding, grinding, and polishing applications
- Includes mounting hardware for easy installation and removal
- Up to 3 additional weight plates can be added for a total on-floor weight of 200 lbs
- Designed to mount using the Hawk HP0023 Pin Kit
- Durable construction for professional, long-lasting use
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Cleaning Equipment, Equipment & Instruments
STI Hawk Splash Guard for Swing Machines
- Genuine splash guard for Hawk® rotary swing machines.
- Contains water and slurry during wet grinding and polishing.
- Helps prevent splashing onto walls, baseboards, and surrounding areas.
- Keeps the work area cleaner and reduces cleanup time.
- Protects nearby surfaces from water and slurry.
- Mounts directly to Hawk rotary floor machines.
- Designed and manufactured by Hawk Enterprises.
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Cleaning Equipment, Equipment & Instruments
STI Hawk Weight Post Kit 4.5 in
- Durable construction for reliable long-term performance.
- Standard 4.5-inch size compatible with most weight plates.
- Securely holds weights in place during heavy-duty operations.
- Easy installation with a stable and reliable fit.
- Corrosion-resistant finish for indoor and outdoor applications.
- Helps improve equipment stability and safety.
- Suitable for industrial, agricultural, fitness, and material handling applications.
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Cleaning Equipment, Equipment & Instruments
STI 25lb Weight Kit for Swing Machines
- Adds 25 lbs of down pressure to increase cutting performance
- Improves pad-to-floor contact on tough or uneven surfaces
- Ideal for aggressive grinding, stripping, and scrubbing applications
- Provides additional pressure for demanding floor preparation jobs
- Mounts directly to Hawk® rotary floor machines
- Allows weight adjustment based on application requirements
- Made by Hawk Enterprises for reliable performance
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STI Prep/Master Service Parts
Find maintenance kits, repair kits, couplers and grout pans for your Prep/Master. Match the exact model and part number to the product listing.
Match Service Parts to Your Prep/Master
Use the exact machine model and part number when choosing repair kits, maintenance components, couplers or grout pans. Open each product listing to confirm compatibility and available options.
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Grinders/Polishers, Equipment & Instruments
STI EG Grout Pans
- Patent-pending stainless steel grout pans
- Designed for Prep/Master® floor grinders
- Fills pinholes and small voids in epoxy terrazzo and concrete
- Creates a smoother, denser surface before final polishing
- Essential grouting step in the TPS Terrazzo Polishing System
- Used with epoxy and marble flour (calcium carbonate powder)
- Recommended operating speed: 15Hz (electric) or 2100 RPM (propane)
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Grinders/Polishers, Equipment & Instruments
STI Maintenance Kit – P/M Propane 2418LP/2818LP
- Complete maintenance kit for Prep/Master® 2418LP and 2818LP propane grinders.
- Helps reduce downtime by keeping essential service parts readily available.
- Includes engine, filtration, ignition, and drive system maintenance components.
- Supports routine preventive maintenance for improved machine reliability.
- Genuine STI replacement parts designed for optimal equipment performance.
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Grinders/Polishers, Equipment & Instruments
STI Maintenance Kit – P/M Propane 3038LP/4438LP
- Preventive maintenance kit for Prep/Master® 3038LP and 4438LP propane grinders.
- Designed for 30-inch and 44-inch propane Prep/Master® grinding machines.
- Helps reduce downtime by keeping essential maintenance parts readily available.
- Includes engine, filtration, ignition, and drive system replacement components.
- Supports routine maintenance to maximize equipment reliability and performance.
- Genuine STI replacement parts for professional maintenance.
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Grinders/Polishers, Equipment & Instruments
STI Morflex Coupler
- Flexible drivetrain coupling designed for Prep/Master® machines.
- Absorbs shock and minor misalignment to protect internal components.
- Helps reduce stress on the engine and gearbox.
- Replacement wear part that restores smooth machine operation.
- Available for multiple Prep/Master® grinder models.
- Helps minimize downtime by keeping a spare part available when needed.
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Grinders/Polishers, Equipment & Instruments
STI Repair Kit – P/M Grinding Machine
- Convenient spare parts package for Prep/Master® grinding machines.
- Helps prevent extended downtime caused by unexpected machine repairs.
- Includes essential components for emergency maintenance situations.
- Genuine STI replacement parts designed for reliable machine performance.
- Keeps critical repair components available when needed.
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Grinders/Polishers, Equipment & Instruments
STI Repair Kit – Prep/Master Jr
- Complete repair kit designed for the Prep/Master Jr. grinding machine.
- Helps reduce downtime by providing essential replacement components.
- Includes drivetrain, dust control, and mounting hardware parts.
- Genuine STI replacement parts for reliable machine maintenance.
- Ideal for emergency repairs and keeping equipment ready for operation.
Brands Carousel
How to Choose STI Machines for Your Project
- Floor Preparation: Compare grinders for your slab condition, job size and intended finish.
- Available Power: Review voltage, phase and electrical or propane requirements for your site.
- Dust Collection: Match the collector, hose connections and accessories to the equipment.
- Tooling Compatibility: Confirm plates, adapters and tooling quantities for the selected machine.
- Service Parts: Keep the exact machine model and part reference on hand when ordering replacements.
Substrate Technology, Inc. supplies Prep/Master floor preparation equipment, diamond systems and supporting products. This collection also includes partner brands identified in the STI catalog.
STI Equipment — FAQs
Find answers about STI machines, floor grinders, dust collection, swing machines and replacement parts.
This page brings together STI machines and supporting equipment: Prep/Master and Lavina floor grinders, dust collectors, vacuums, swing machines, compatible accessories and service parts.
Choose STI machines around the slab condition, project size, desired finish and available power.
Compare working width, machine weight, tooling attachment and dust collection requirements in the individual product listings.
This collection follows the STI catalog and includes Prep/Master equipment plus named partner brands such as Lavina, IMPACTS and Hawk. Check each listing for the specific brand and model.
Operating methods vary by machine and tooling. Follow the wet or dry instructions for the exact equipment and diamond system you select.
Included equipment varies by listing. Review the product description and contact USA Granite Tools to confirm the complete machine, tooling and dust collection package.
Match your machine model and exact part number to the listing. Contact USA Granite Tools with the model and part reference if you need help confirming compatibility.
Explore manufacturer information and product resources on the official Substrate Technology website.