4" x 21" Aluminum Oxide Sanding Belt


Pack Size:
1 Belt

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Product Description

4" x 21" Aluminum Oxide Sanding Belt

Name: 4” x 21” Aluminum Oxide Sanding Belt
Description: 4” x 21” Aluminum Oxide Sanding belt for four inch by twenty one inch belt sanders are manufactured with extremely tough, tear resistant, x weight backing and top of the line aluminum oxide abrasive grains. Perfect for sanding grinding or polishing jobs ranging from wood working, cabinet making, and furniture sanding to metal grinding and finishing. These 4" wide 21" long Aluminum Oxide sanding belts are some of the most used abrasive belts due to their diverse array of sanding applications and their affordable price. These 4" x 21" sanding belts a perfect option for day to day deburring, sanding down splinters or jagged edges. 4” x 21” Aluminum Oxide sanding belts come in 40 grit and 60 grit for more aggressive stock removal, 80 grit, 100 grit and 120 grit grit for medium to light sanding, as well as 220 grit, 320 grit, 400 grit, 600 grit, 800 grit, and 1000 grit for fine sanding and polishing. BUILT IN USA.
Other Features:
  • Bi-Directional - the belt can be run in either direction.
  • Closed Coated - 100% of the belt is covered in abrasive grains.
Suitable For: Most Ferrous metals (including cast iron, carbon steel, alloy steel, wrought iron), composites, plastics and wood.
Width: 4″
Length: 21″
Grit: 40, 60, 80, 100, 120, 180, 220, 320, 400, 600, 800, 1000
Material: Aluminum Oxide
Belt Backing Weight: X-Weight

4" x 21" Portable Belt Sander

Quantity: 1 Belt Per Order

Looking for a different size, material or grit? We have access to an extensive amount of hard to find sanding belts. Please contact us and let us know what your looking for.

Reviews Write a Review

  • 5
    4” X 21” Aluminum Oxide sanding belts

    Posted by Unknown on Sep 19th 2020

    Prompted shipped. Good price. Works as advertised. I’ll be back for more.

  • 4
    4” x 21” Belt Sander Belts

    Posted by Jerrold May on Jul 5th 2020

    Bought 40 grit to level old plank floors. Worked great. Haven’t tried other grits yet. This size belt was very hard to find and I thought the price was very reasonable.

  • 5
    Aluminum Oxide Sanding Belts

    Posted by Paul Hadnagy on Jun 12th 2020

    Long lasting, strong belt
    Quick delivery from Empire

  • 5
    Sanding belts

    Posted by Richard Bahlow on May 22nd 2020

    Have not used this product yet, but the service was outstanding.

  • 5
    Belt sandpaper

    Posted by Rick Golding on May 3rd 2020

    The product came quickly and is much better than the big box store paper. I will definitely purchase from you again.

  • 5
    4”X21” belt sander belts

    Posted by Daniel Dow on Jan 14th 2020

    These belts did a great job. I am very happy with the quality. I’ve finished a job that required these belts. The that I previously purchased in town of Longview Wa. Came apart at the seem almost instantaneously. It is nice to find a company like Empire Abrasives that produces a quality product. Thank you Empire and Ben.

  • 5
    4x21 sanding belts

    Posted by paul fisher on Aug 23rd 2019

    I got 69 and 80 grit and they did what I wanted

  • 5
    grate belts 4 x 21

    Posted by Unknown on Jul 12th 2019

    these belts work grate and the service was out standing

  • 5
    Good product, good price.

    Posted by Martin Ciura on May 22nd 2019

    I was pleased to find sanding belts on your site.
    I have an odd size (4 x 21) and they are just about
    impossible to find locally (Cleveland).
    I'll be needing some 1" strip for my next order.