3M Cubitron II File Belts 786F, 3/8 × 13, 1/2 × 18 or 3/4 × 20-1/2 in, 36+ to 80+
SKU:33437
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- Ships in 1–2 business days from Eugene, OR
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- Free pickup in Eugene, OR — usually ready in 24 hours
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In stock
What you get
10 beltsin every box you order
- 1 box
- 10 belts
- Full case
- 5 boxes · 50 belts
Stocking the shop? Set quantity to 5 for a full case.
Specifications
- Part number
- 33437
- Brand
- 3M
- Grit
- 36+
- Abrasive mineral
- Precision Shaped Ceramic
- Backing
- Polyester
- Size
- 3/8 × 13 in
- Wet or dry
- Dry
- UPC
- 051131334373
Use it for
- Cleaning
- Rust Removal
- Cutting
- Grinding
- Coating Removal
3M's precision-shaped-grain file belts for spot weld removal, rivet grinding and tight-access prep. 3M says Cubitron II cuts 30% faster and lasts twice as long as conventional ceramic, and runs cooler to limit discoloration and heat stress.
- Faster cut (3M)
- 30%
- Longer life (3M)
- 2x
- Grades
- 36–80+
- Belts per carton
- 10
Belts and sanders
| Belt | 3M sander | Grades here |
|---|---|---|
| 3/8 × 13 in | Mini File Belt Sander 33573 | 36+, 60+, 80+ |
| 1/2 × 18 in | File Belt Sander 33575 | 36+, 60+, 80+ |
| 3/4 × 20-1/2 in | File belt sanders taking 20-1/2 in belts | 36+, 60+, 80+ |
Sharp grain, cool cut
- Precision-shaped grain. Triangular ceramic grain on a heavy XE-weight backing.
- Cooler grinding. Less risk of discoloration and heat-related stress cracks.
- Shop jobs. 3M lists spot weld removal, rivet grinding, brake caliper cleaning, wheel corrosion removal and steering knuckle prep.
Tech specs
| Product | 3M Cubitron II File Belt 786F |
|---|---|
| Sizes | 3/8 × 13, 1/2 × 18, 3/4 × 20-1/2 in |
| Grades | 36+, 60+, 80+ |
| Grain | Precision-shaped ceramic |
| Backing | XE weight |
| Pack | 10 belts per carton |
| Replacements | Cubitron 3 (e.g. 33479 for 33437, 33480 for 33439) |
Related
FAQ
Which belt fits my sander?
3M's Mini File Belt Sander 33573 takes 13 in belts, and the 33575 takes 18 in belts. Match the belt length to your sander.
Is this belt still made?
3M discontinued it on May 18, 2026. We're selling through our stock; Cubitron 3 is the replacement.
What jobs is it for?
3M lists spot weld removal, rivet grinding, brake caliper cleaning, wheel rim corrosion removal and steering knuckle prep.
How many belts per carton?
10 belts per carton.
Manufacturer documents: 3M Cubitron II discontinuation letter (PDF)
