The 3M 7000139621 is a rugged, production‑grade 3M cubitron 984F II ceramic belt built for very aggressive material removal. Sized at 2.0" wide by 72.0" long, it’s suited to centerless grinders, benchtop and backstand setups where space is limited but power is high. Precision Shaped Ceramic grains deliver faster cutting and longer life than conventional abrasives, so users spend less time changing belts. A YF‑weight polyester cloth backing adds strength and resists stretch under heavy pressure, keeping the belt stable through tough grinding cycles. Closed‑coat construction maximizes abrasive coverage, making this belt an ideal upgrade over common 36 grit sanding disc or grinding disc options. Film‑Lok splice forms a low‑profile, dependable joint that withstands continuous, high‑load runs without frequent failure. Heat‑resistant design and a built‑in grinding aid help control temperature and reduce risk of burning or finish loss during long or robotic cycles. Color-coded maroon and intended for wet or dry use, it supports stainless steel and related alloys in demanding finishing or polishing work. This 3M Cubitron II 984F belt is a strong solution for shops that need the power of a 36 grit system but with a faster cut, better life and more predictable results. Choose the 3M 7000139621 when heavy stock removal, uniform finish and reduced downtime are priorities on steel or exotic‑metal applications.
Precision Shaped Ceramic Abrasive
Self‑sharpening ceramic grains maintain cutting speed and extend belt life compared with traditional 36 grit sanding disc or grinding disc belts.
Durable YF‑Weight Polyester Backing
Cloth backing resists stretch under high pressure and heat, supporting sustained aggressive grinding and finishing cycles.
Closed‑Coat for Maximum Cutting Coverage
High abrasive coverage enables very fast stock removal, ideal when replacing or outperforming a typical 36 grit sanding disc.
Film‑Lok Splice for Reliable Continuous Runs
Smooth, strong joint reduces the risk of belt failure and downtime during long or automated finishing operations.
Industrial Heat Control With Grinding Aid
Designed to run cooler and resist burning, delivering a uniform finish over the life of the belt in medium- to high‑pressure metalworking.
| Manufacturer Part Number | 7000139621 |
| Overall Length (Inch) | 72.0" |
| Overall Length (mm) | 182.88 cm |
| Overall Width (Inch) | 2.0" |
| Overall Width (mm) | 50.8mm |
| Abrasive Material | Precision Shaped Ceramic |
| Application | Finishing, Polishing |
| Backing Material | Polyester Cloth |
| Backing Weight | YF Weight |
| Coat Type | Closed Coat |
| Color Family | Red |
| Flex Type | Single-Flex |
| For Use On | Stainless Steel |
| Grit | 36+ |
| Splice Type | Film-Lok |
| Substrate | Cast Iron |
| Wet or Dry | Wet or Dry |
| Product Color | Maroon |
| Product Form | Belt |
| Product Number | 984F |
| Equipment - Machines | Centerless Grinders, Benchtop, Flat Finishers, Rapid Grinders, Roll Grinders, Backstand, Robotics |
What is the exact size of the 3M 7000139621 belt?
It is 2.0" wide by 72.0" overall length, made as a Precision Shaped Ceramic cloth belt in the 984F series.
Which tasks is this belt best for?
Heavy material removal, surface preparation, finishing and polishing on stainless steel, cast iron or similar metals in production settings.
Why choose this over a standard 36 grit sanding disc?
The 3M Cubitron 36 grit variant cuts faster, lasts longer, and provides a more consistent finish than many conventional 36 grit sanding discs.
Can this belt run wet or dry?
Yes, it supports wet or dry use, giving flexibility for different finishing workflows and metal types.
What is 36 grit sandpaper used for?
It’s used for very aggressive stock removal, heavy blending and initial surface prep—exactly the tasks where this belt excels.
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