Floor Machine Brush Selection Guide

General Machine Brush Selection Guide

Machine Brush Should Be 2″ Smaller Than Machine Size Rating

A brush, long-trim pad driver, or short-trim pad driver without a riser, should be 2″ smaller than the machine size.
Therefore, a 20″ floor machine would use an 18″ brush.

Pad Driver Should Be 1″ Smaller Than Machine Size Rating

A short-trim pad driver should be 1″ smaller than the machine size.  This rule applies to over 90% of applications.  A 20″ machine would use a 19″ pad driver.

Measuring Machine Brush Block Diameter

Lay the brush on the bristles with the block side up. Measure the outside diameter of the block (not the bristle flare).

Measure Machine Brush Center Hole Diameter

Lay the brush on the bristles block side up. Remove mounting hardware, if any.  Measure inside diameter of the center hole.

Clutch Plate Based on Block Diameter and Center Hole Diameter

Once the correct size of brush and the proper clutch plate (center hole) is determined, you’ll need to determine the size and layout of the lugs.  The lugs are the three metal studs that protrude from the block of the machine brush or pad driver.  These lugs help hold the brush/pad driver to the floor machine it mounts onto.

Select the Correct Type of Brush (or Pad Driver)

There are several options for brush filler material.  Filler materials have different grits and other characteristics to help you accomplish your cleaning tasks.

With pad drivers, you’jj need to determine if you want a low profile or high-rise block.  Low profile risers are most common.  Once the riser is determined, select the length of trim.  Most pad drivers have short, stiff poly trim.

Machine Brush Fill Material Options

MAL-GRIT XTRA™ (or Equivalent)

The most aggressive grit fiber available.  Used primarily on concrete floors in factories, it can also be used for extremely heavy stripping applications. Comparable to a high productivity strip pad, it must be used on a wet surface.  In many instances, the fiber color is orange.

MAL-GRIT™ (or Equivalent)

The most widely used grit fiber, it is ideal for stripping finishes from hard surfaces. Comparable to a black or brown pad, it must be used on a wet surface.  In many instances, the fiber color is black.

CLEAN-GRIT™ (or Equivalent)

This grit fiber is used for general cleaning of most hard surface flooring.  Comparable to a blue pad, it must be used on a wet surface.  In many instances, the fiber color is blue.

MAL-GRIT LITE™ (or Equivalent)

The least aggressive grit offered, it is ideal for daily cleaning of hard floors.  Mal-Grit Lite™ is comparable to a red pad and can be used to polish surfaces.  In many instances, the fiber color is grey.


Used in a wide variety of scrubbing applications.  It offers excellent resistance to many chemicals but should not be used with acids.  Although it is offered in a wide range of diameters, the most common combination is .025″/.028″ for use in carpet scrubbing.


Used for general scrubbing of most hard surfaces.  The most common diameter is .028″ which gives a scrubbing action similar to bassine but much longer life.


Most often used to scrub concrete floors.  However, the use of wire has been replaced in recent years by the grit brushes that offer longer life and better scrubbing action.


A natural fiber that is used as a standard scrubbing brush.  Although this is a low cost brush, it does not provide good value due to the limited life of the fiber.


A combination of white tampico and palmyra that is used primarily in polishing applications.


Has excellent natural acid resistance and is used extensively in marble care.  This natural fiber has a slight abrasiveness which makes it a good polishing material.


An extremely aggressive wire that is used to scarify concrete floors.


Contact us to discuss your situation.  We can help!

Machine Brush Guide for Scrubbing

Machine Brush Guide for Scrubbing

Machine Brush Guide

Machine Brush Guide for Stripping