- The 3M 33443 Cubitron II File Belt 786F is a premium precision-shaped ceramic abrasive belt in 36+ grit, sized at ½-inch by 18-inch, made for file belt sanders to quickly grind through spot welds, clean metal, and remove coatings with cooler operation and long life.
- Features
- Features 3M's tough and best in class Cubitron II mineral
- Grains of ceramic/aluminum oxide blend are precisely-shaped, uniformly-sized and vertically oriented
- Slices through hard metal for fast cut
- Cubitron II abrasives run cooler, reducing risk of metal discoloration/oxidation and heat related stress cracks
- A grinding aid further enhances cooler running on high-strength steel
- Exceptionally long-lasting belt performs consistently and reliably throughout its life
- Used with the 3M File Belt Sander, easily grinds out rivets and spot welds
- Specifications
- Abrasive Material: Precision Shaped Ceramic
- Alternative Sale Availability: This item is for industrial use only and there are no VOC restrictions.
- Backing Material: Polyester
- Backing Weight: XE Weight
- Brand: Cubitron
- Color Family: Purple
- Converted Form: Belt
- Grit: 36+
- Overall Length (Imperial): 18 in
- Overall Length (Metric): 457.2 mm
- Overall Width (Imperial): 0.5 in
- Overall Width (Metric): 12.7 mm
- Product Color: Purple
- Product Form: Belt
- Wet or Dry: Dry
- Part Number 33443, 3M Product Number 786F, 3M ID 7100033184, UPC 051131334434
- The 3M Cubitron II 33443 File Belt can also be referred to as 3M 786F file belt, 36+ Cubitron II belt, ½-inch x 18-inch ceramic file belt, precision shaped grain file belt, and heavy duty metal removal belt.
3M’s Cubitron II 33443 brings advanced precision shaped grain technology to demanding metal prep jobs. It delivers high cut rates, cooler operation, and significantly longer service life compared to conventional belts—ideal for professional collision, fabrication, or maintenance shops.
Q: What tools and machines work with this belt?
A: It is designed for 3M file belt sanders (e.g. model 28366) and other compatible file belt tools that accept ½-inch × 18-inch belts. Ensure the backing plate or platen supports this size.
Q: How do I maximize belt life and performance?
A: Use light to moderate pressure, allow the precision shaped grain to do the cutting, maintain good airflow or dust extraction, keep the belt clean, and avoid overheating which can reduce performance or cause coating failures.
Q: What safety practices are recommended when using this belt?
A: Wear eye protection and gloves, ensure proper guards on the sander are in place, avoid loose clothing or jewelry near moving parts, use dust collection or respirators when grinding, inspect the belt for damage before use, and always operate within the machine’s rated RPM.
