3M Fiber Disc 787C 120+ Grit 5 in Right Angle Grinder, box of 100

3M 787C 120+ Grit Fibre Disc SAB89655

The 3M 787C fibre disc is a rigid abrasive disc designed for grinding, beveling and surface preparation on ferrous metals, stainless steel and aluminum. 120+ grit in zirconia alumina, 127 x 22 mm (5 x 7/8 in). Sold in a case of 100 units (4 bags of 25). Available on special order.

3M purchase code: 7000028832, model: 787C

3M 787C fibre discs offer aggressive cutting and sustained performance from their zirconia alumina abrasive. Compatible with 5-inch angle grinder backing pads. Rigid construction maintains cutting pressure even under heavy use.

Advantages

• Steel grinding and beveling: Effectively removes excess metal from welds and castings with high cutting pressure throughout disc life.

• Surface preparation before coating: Creates a uniform anchor profile meeting SA2.5 specifications on metal surfaces before coating application.

• Oxide and scale removal: Direct cutting action on rust and scale without deformation even under heavy pressure.

• Continuous production: Case of 100 units ensures uninterrupted supply for high-cadence workshops.

FAQ - Frequently asked questions

What is the difference between 120+ grit (SAB89655) and 80+ grit (SAB89646)?

The 120+ grit produces a smoother, more uniform surface, ideal for intermediate finishing before coating or painting. The 80+ grit (SAB89646) provides more aggressive cutting with a higher material removal rate, recommended for roughing and removing significant defects. For a professional finish, start with 80+ grit and finish with 120+ grit.

Is a backing pad required for fibre discs?

Yes, 3M fibre discs must be used with a rigid backing pad matched to the disc diameter. Without a pad, the disc deforms and loses efficiency, increasing the risk of accident. The backing pad is not included in the box of 100 discs.

Are these discs compatible with stainless steel?

Zirconia alumina can be used on stainless steel provided the discs are new and uncontaminated by ferric residues. For stainless steel applications in food or pharmaceutical environments, dedicate an exclusive batch to stainless steel to avoid cross-contamination.

Complementary suggestions

Grinding metal generates sparks, metallic dust and high noise levels. Protect yourself with Endura Pro cut-resistant gloves (G378GKGVBE), mechanic high-visibility gloves (GMXVSB), gray anti-glare safety glasses (YASF407BG), EARsoft corded earplugs (OA1252C) and a flame-retardant Arc Flash coverall (V7705). Under "Accessories" at the bottom of the page, you will find these products directly.

Complete your setup with other 3M abrasives: the 787C 3M Fiber Disc 787C 60+ Grit (SAB89637), the grit 3M Fiber Disc 787C 80+ Grit (SAB89646) and the Scotch-Brite 3M Scotch-Brite Clean and Strip XT Pro (SA21661).

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