3M ProHookit Disc 7447

3M ProHookit Disc 7447 SAHA7447

The 3M ProHookit 7447 disc is a Type 27 abrasive disc designed for surface preparation, paint and coating stripping, and metal cleaning. Aluminum oxide abrasive, 100 mm (4 in) diameter, compatible with angle grinders equipped with a ProHookit backing pad. Ultra Fine grit. Sold in a case of 40 units. Note: available on special order.

3M purchase code: 7100011900, model: 7447

The ProHookit (hook and loop) attachment system allows fast disc changes without tools, ideal for operations alternating different grits or finish types. Aluminum oxide abrasive provides stable performance on metal, plastic and composite materials. The contoured profile absorbs vibrations and follows surface contours for a uniform finish.

Advantages

• Fine surface preparation: Ultra Fine grit removes light oxide traces, weld residue and surface imperfections while leaving a clean finish compatible with direct paint or primer application.

• Fast disc changes: The ProHookit system allows disc changes in seconds without any key or additional accessory, reducing downtime in production.

• Material versatility: Aluminum oxide works effectively on steel, aluminum, rigid plastics and fiber composites, making the 7447 disc a versatile tool for multi-material production shops.

• Pre-coating finish: The case of 40 units provides sufficient stock for industrial painting teams performing surface preparations in series.

FAQ - Frequently asked questions

Is the ProHookit 7447 disc compatible with all angle grinders?

No, the ProHookit 7447 disc requires a ProHookit (hook and loop) backing pad to work. It is not compatible with conventional screw or pressure backing pads. Check your grinder's compatibility with the ProHookit backing pad before purchasing. 3M ProHookit backing pads are sold separately.

What is the difference between Ultra Fine grit and other abrasive disc grits?

Ultra Fine grit is used for fine finishing, light rough grinding and surface preparation before painting or coating. It removes less material than coarse grits but produces a smoother, more uniform surface. For intensive stripping or weld removal operations, coarser grits like S grit (Scotch-Brite Clean and Strip) are more appropriate.

Can 7447 discs be used on aluminum without contamination?

Yes, aluminum oxide in 7447 discs contains no iron and can be used on aluminum without risk of ferrous contamination. For aerospace or precision manufacturing applications, use dedicated new discs for each material and avoid contact with steel surfaces during storage.

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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