KS390 3 X 90 INCH ABRASIVE BELT GRINDER, aggressive, strong, high speed, speed, high quality, quality, high performance grinder, aggressive grinding, machine shop equipment, fabrication tools, metalworking machinery, metal finishing, finishing metal, iron and metal, steel grades, industrial casting

KS390 Metal Finishing Belt Grinder

The KS390 3″ x 90″ Belt Grinder is built for tough shop environments where reliability matters. This high-speed unit gives foundries and fabrication teams the power they need for metal finishing, smoothing rough cast parts, and finishing metal across a wide range of iron and metal projects. Its long 3″ x 90″ belt tracks true and runs fast, making it ideal for shaping, blending, and prepping different steel grades with ease. Whether you’re cleaning up gates from industrial casting or dialing in precision surfaces for production work, the KS390 delivers consistent results day after day. If your shop needs dependable power, smooth performance, and American-made durability, the KS390 is the grinder that helps you get the job done right.

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Made in the USA

The KS390 3″ x 90″ Belt Grinder gives your team the power, speed, and durability needed to handle demanding shop work every day. It’s built to boost productivity, improve quality, and keep your operation running smoothly.

Here’s how it helps your crew succeed:

  • Handles tough shop jobs — Perfect for metal finishing and heavy finishing metal tasks on cast parts, welds, and rough surfaces.

  • Built for foundry conditions — Strong enough to grind, smooth, and blend iron and metal straight off the casting line.

  • Versatile on all materials — Works cleanly across a wide range of steel grades, from mild steel to tougher alloys.

  • Great for casting cleanup — Ideal for trimming, shaping, and refining parts from industrial casting without slowing production.

  • Fast, smooth performance — The long 3″ x 90″ belt gives more working area, better tracking, and consistent results across large or complex parts.

  • American-made reliability — Designed for nonstop use in fabrication shops and foundries that depend on equipment that lasts.

If your shop needs a grinder that works as hard as you do, the KS390 delivers the strength and performance to keep every project moving forward.

Motor Specifications

  • Power options:

    • 2 HP, 1-phase 230V motor

    • 3 HP, 3-phase 230V or 460V motor (specify when ordering)

  • Amperage:

    • 1-phase: 230V at 11.5 amps

    • 3-phase: 208V at 7.9 amps

    • 3-phase: 230V at 7.2 amps

    • 3-phase: 460V at 3.6 amps

Steel Platen Specifications

  • Length: 24-1/2 inches

  • Reversible and replaceable steel platen

Drive System

  • Direct drive for consistent power delivery

Replaceable Contact Wheel

  • Diameter: 8 inches

  • Surface: Serrated, 70 duro

  • Bearings: Sealed ball bearings

Switch Type

  • On/off magnetic switch for safety and convenience

Belt Size

  • Uses 3″ x 90″ belts of all types

Tension System

  • Pre-set spring belt tension

  • Quick-release belt tension lever

Belt Tracking and Safety Features

  • Easy belt tracking adjustment

  • Material work stop

  • Removable steel platen guard

Adjustability

  • Adjustable steel work table

  • Multi-position belt grinder head: horizontal through vertical

Construction

  • Hinged door on grinder head for quick belt changes

  • Sturdy steel base

Belt Speed

  • 7200 SFPM (Surface Feet Per Minute)

Equipment Options

  • Aluminum oxide belts: 50, 80, and 100 grits

  • VFD: Variable Frequency Drive

Shipping Dimensions and Weight

  • Dimensions: L 48″ x W 57″ x H 52″

  • Weight: Approximately 500 lbs

  • Weight and dimensions are subject to change

Country of Origin

  • Made in USA

  • KB39050 – 3″ x 90″, 50 grit, general-purpose aluminum oxide sanding belts (sold in packs of 10)
  • KB39080 – 3″ x 90″, 80 grit, general-purpose aluminum oxide sanding belts (sold in packs of 10)
  • KB390100 – 2″ x 72″, 100 grit, general-purpose aluminum oxide sanding belts (sold in packs of 10)

The KS390 3″ x 90″ Belt Grinder is built to tackle the everyday demands of production environments, giving your team the power and control needed to work faster and finish stronger. It’s a trusted tool for shops that handle everything from rough cast parts to precision components.

Common applications include:

  • Metal finishing on welds, seams, and large plate surfaces

  • Finishing metal parts after cutting, shaping, or machining

  • Cleaning and smoothing iron and metal from gates, risers, and rough edges

  • Blending, shaping, and prepping various steel grades for fabrication and assembly

  • Removing flash, burrs, and imperfections from industrial casting operations

  • Prepping surfaces for paint, coatings, or secondary finishing steps

  • Creating smooth transitions on brackets, frames, and heavy components in fabrication work

When your shop needs a grinder that performs across multiple tasks and materials, the KS390 delivers the versatility and durability to keep production moving.

KS390 3 X 90 INCH ABRASIVE BELT GRINDER, aggressive, strong, high speed, speed, high quality, quality, high performance grinder, aggressive grinding, machine shop equipment, fabrication tools, metalworking machinery, metal finishing, finishing metal, iron and metal, steel grades, industrial casting

Additional Equipment Images and Accessories

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KB390100 3 x 90 inch 100 grit sanding belt, aluminum oxide

The KS390 is designed for metal finishing work. It helps you smooth, shape, and prep parts when you’re finishing metal, cleaning edges, or removing imperfections from iron and metal castings.

Yes. The KS390 works well on mild steel, stainless, tool steel, and most other steel grades you use in fabrication or production.

The grinder accepts standard 3″ x 90″ abrasive belts. This gives you a wide working surface for heavy grinding or fine finishing.

Absolutely. Foundries use the KS390 to clean gates, fins, parting lines, and rough edges on industrial casting parts. The high belt speed helps remove material quickly and evenly.

The KS390 is available in 1PH 220V or 3PH 220V/440V configurations, providing the power required for demanding production environments and continuous-duty work.

The belt operates at 7200 SFPM, which gives you cleaner results when you’re finishing metal or removing tough material from iron and metal parts.

Yes. You can switch between coarse, medium, or fine abrasive belts depending on whether you’re removing heavy stock or doing final metal finishing.

No. The KS390 is designed with easy-access wheels and pulleys. Shops only need to check belt tracking, clean dust, and inspect wheels and guards regularly.

Yes. Like all Kalamazoo Industries equipment, the KS390 is built in the USA for reliable, long-lasting performance.