3M Hookit Microfinishing Film Disc 366L, 40 Mic 3MIL, Type D, 5 in x NH, Die 500X, 50/Pac, Case of 500

• Aluminum oxide abrasive offers a fast cut, long life, and professional performance on many surfaces
• Available in both open coat and dust control
• Durable polyester film backing enables close-tolerances and consistent finish
• Hookit hook and loop backing allows quick attachment and removal for multi-step finishing processes
• Load-resistant coating prevents dust and debris from clogging the disc

3M Hookit Microfinishing Film Disc 366L is rated Best in the 3M Microfinishing line of film backed discs. It features premium, micron-graded aluminum oxide abrasive bonded to a durable polyester film backing to produce a fast cut-rate and uniform finish on wood, solid surface composites, plastic, fiberglass, paint prep, coating and corrosion removal, primer, e-coat, or metal.

We gave these discs a load resistant coating to increase efficiency and product life by minimizing loading. The abrasive is resin-bonded and supports disc flexibility without sacrificing durability and reliable performance under high heat and pressure. To complement the effective abrasive action, the polyester film backing flexes to help achieve a consistent finish over contours and offers greater tear-resistance than comparable paper products, making it ideal for high-production environments. And the 3M Hookit attachment and removal system holds the disc securely during use and provides easy disc change out. Designed for use with orbital and random orbital sanders, this disc comes in a range of grades for complete multi-step sanding and finishing.

Our 3M Hookit Microfinishing Film Disc 366L features precision, micron-graded aluminum oxide, which is a popular choice among industrial professionals because of its fast cut-rate and long life. This mineral makes a tough, durable abrasive that self-fractures to expose fresh cutting edges, whereas traditional natural abrasives dull more quickly. Due to its fast cut-rate, hardness, and strength, it is widely used in grinding applications in addition to sanding and finishing applications. Aluminum oxide is suitable for a wide variety of materials in both woodworking and metalworking, including ferrous alloys.

Whether the job requires a random orbital or rotary sander, buffer, grinder, drill, finishing sander or other power tool, hook-and-loop products allow the operator to focus more on the task and less on tooling. Abrasive products with hook-and-loop backing, including 3M Hookit products, are manufactured with loop material that attaches to a backup pad, sold separately, where tiny hooks firmly engage the loops. Attachment is quick, easy, and secure during use. Sanding, finishing, and surface conditioning products with the hook-and-loop attachment and removal system provide an efficient way to work through multi-step finishing processes and can be used again and again for the life of the abrasive.

Our 3M sanding discs come in a variety of forms to fit various power tools and disc pads. Hook and Loop sanding discs are designed to be used with a random orbital sander, a handheld sanding machine that rotates the disc in a random pattern to prevent swirl marks from forming on the surface of the workpiece. The sander is fitted with a backup pad (sold separately) to which the sanding disc is attached. Hook-and-loop discs are quick and easy to change when switching from one grade to another, and can be reused again and again until worn out; whereas adhesive-backed discs are typically discarded after one use because the adhesive backing will not re-adhere a second time.

Trusted 3M Hookit Quality

The 3M Hookit Microfinishing Film Disc 366L offers reliable performance with its premium aluminum oxide abrasive. This fast-cutting, long-lasting mineral is bonded to a durable polyester film backing, ensuring professional results on many surfaces.

Designed for multi-step finishing, the Hookit hook and loop backing allows quick attachment and removal. This model 366L is part of the 3M Microfinishing line, known for consistent finish and efficiency.

Precise 40 Micron Grade

This disc features a 40 Mic 3MIL grade, providing a fine abrasive suitable for detailed sanding and finishing. The micron-graded aluminum oxide supports a uniform finish on wood, composites, and metals alike.

Its precision grade helps maintain consistent results whether used on paint prep, corrosion removal, or primer sanding. The 40 Micron rating balances cut rate and finish quality effectively.

Optimal 5 Inch Size

The 5 inch diameter fits standard orbital and random orbital sanders, making it versatile for various power tools. This size is ideal for both small and medium surface areas requiring smooth finishing.

Compatible with backup pads, the 5 in x NH format ensures easy disc changes and secure attachment. It supports efficient sanding workflows in industrial and woodworking settings.

Efficient Die 500X Format

The Die 500X format enhances the disc’s flexibility and tear resistance, thanks to its polyester film backing. This makes it suitable for high-production environments where durability matters.

Its load-resistant coating prevents clogging from dust and debris, extending product life. This format supports consistent finish quality even under high heat and pressure conditions.

Large 50 Pack Case

Each case contains 500 discs, organized in 50 packs for convenient storage and use. This bulk packaging supports continuous work without frequent reordering, ideal for professional shops.

The pack count ensures you have enough discs for extensive projects or multiple jobs. The 50/Pac, 500 ea/Case specification helps maintain inventory and reduces downtime.